Common Informers (Parliamentary Disqualifications) Act 1975

The Act is compact and built around a small number of interlocking legal concepts. Each concept appears in the text and should be kept distinct when advising clients or structuring litigation.

• Person declared by the Constitution to be incapable of so sitting. The Act’s primary trigger is the status of a person as one "declared by the Constitution to be incapable" of sitting as a senator or member of the House of Representatives (s 3(1)). The Act does not define the constitutional declaration mechanism or list grounds; it assumes such declarations exist under the Constitution, and it targets persons who have been so declared.

• Common informer remedy in the High Court. The liability is payable to "any person who sues for it in the High Court" (s 3(1)). This sets up a private enforcement mechanism in the nature of a common informer action, but only in the High Court.

• Quantified statutory penalty structure. Liability is expressed as monetary sums: $200 in respect of having sat on or before service of originating process, and $200 for every day after service on which the person is proved to have sat (s 3(1)(a) and (b)). The Act provides fixed dollar amounts, not discretionary damages. The text treats those sums as the legal measure of liability.

• Temporal limitation on subject matter. Section 3(2) provides a jurisdictional or subject-matter limit by prohibiting suits that "relate to any sitting ... at a time earlier than 12 months before the day on which the suit is instituted." This limits what sittings can be the subject of the suit.

• Non-duplication safeguard. Section 3(3) instructs the High Court to refuse to make any order that the Court considers would penalise the defendant more than once in respect of any period or day of sitting. This prevents overlap with any other penal or compensatory consequences for the same period.

• Displacement of s 46 of the Constitution. Section 4 removes liability and the right to institute suits under section 46 of the Constitution "on and after the date of commencement" of the Act. The statute thus displaces a pre-existing constitutional enforcement route and substitutes the statutory regime.

• Exclusive jurisdiction of the High Court. Under s 5 the Act expressly confers original jurisdiction on the High Court and excludes jurisdiction in "any other court" for suits under this Act. That is a statutory allocation of forum and exclusivity.

• Retroactivity as to conduct. Section 3(1) expressly applies to persons who "whether before or after the commencement of this Act, has sat" while constitutionally incapable. The Act therefore reaches conduct prior to its commencement, subject to s 3(2)’s 12-month limitation on which sittings a suit may relate to.

These concepts define the legal mechanics: a private actor sues in the High Court, within the statutory temporal limits, to recover fixed sums for disqualified sittings, while the Act abolishes the prior avenue under s 46 of the Constitution and requires the High Court to avoid double-penalisation.

The statute allocates rights and liabilities across discrete cohorts. The text itself identifies the affected parties and the roles they play.

• The primary targets of liability are persons who have "sat as a senator or as a member of the House of Representatives" while they were "persons declared by the Constitution to be incapable of so sitting" (s 3(1)). That language confines liability to legislators who have been identified as constitutionally incapable, as that phrase is understood in the Constitution. The Act does not purport to expand liability to other persons or to persons who are merely alleged to be ineligible; the statutory liability triggers when the person has sat while constitutionally incapable, as established in the proceeding.

• The payee is any private person who sues in the High Court. The remedy is payable "to any person who sues for it in the High Court" (s 3(1)). The statute therefore empowers private individuals to commence enforcement actions, rather than leaving enforcement to public authorities. It creates a monetised incentive for private litigants to commence High Court proceedings.

• The High Court is the sole judicial forum for these suits. Section 5 confers original jurisdiction on the High Court and explicitly denies jurisdiction to any other court. That means practitioners, claimants and defendants must engage the High Court in original proceedings for enforcement under the Act.

• Parties who might previously have relied on section 46 of the Constitution are affected by the removal of that route. Section 4 states that "a person is not liable to pay any sum under section 46 of the Constitution and no suit shall be instituted, continued, heard or determined in pursuance of that section" on and after commencement. That extinguishes any ongoing or future reliance on s 46, and thus affects those who might have brought claims under that constitutional section.

• Parliament and its members face behavioural incentives. Although the Act does not create a criminal sanction, it creates a private financial exposure if a person sits despite being constitutionally incapable. Members and senators who may risk being declared constitutionally incapable are therefore indirectly affected, because private parties can sue them in the High Court for fixed sums.

• Process servers and litigators who implement originating process and service are affected in practical terms. Section 3(1)(a) uses the day on which the originating process in the suit is served as the cut-off for the initial $200 liability. Consequently, claimants and their agents must ensure service is effected and proved, because the service date has a direct effect on the statutory calculation.

• Courts other than the High Court are excluded from these matters. Section 5 denies jurisdiction to other courts, so state and federal courts below the High Court are not permissible fora for suits under this Act.

• Persons who might be subject to multiple penalties for the same sitting are protected by s 3(3), which requires the High Court to refuse to make orders that would penalise a person more than once for the same period or day. This allocation protects defendants from cumulative monetary punishments for the same conduct.

In short, the Act places monetary liability on a narrow class of legislators, vests the private right to sue in any person, channels proceedings exclusively to the High Court, and displaces the earlier constitutional enforcement route under s 46.

The statute creates defined rights for prospective claimants, constrained duties on defendants, and procedural obligations around forum and timing. These rights and duties are statutory and expressed in short, specific provisions.

Rights

• Right to sue in the High Court. Any person has the statutory right to sue in the High Court to recover the sums specified by s 3(1). The Act frames this as an entitlement: the liable person "shall be liable to pay to any person who sues for it in the High Court" (s 3(1)). That language gives a private person a statutory cause of action.

• Right to exclusive High Court adjudication. Claimants have the right to have the claim heard in the High Court as original jurisdiction is conferred by s 5. They cannot be shunted to other courts for suit under this Act.

Duties and limitations on defendants

• Duty to pay fixed statutory sums if found liable. The statutory duty is to pay $200 in respect of having so sat on or before the day on which the originating process is served, and $200 for every day after that day on which the person is proved to have so sat (s 3(1)). The duty is monetary and quantified.

• Duty not to be double-penalised. The High Court must refuse to make any order that would cause the defendant to be penalised more than once in respect of any period or day of sitting (s 3(3)). This imposes an implied protective duty on the Court to avoid multiplicity of financial penalties.

Procedural and temporal constraints

• Limitation of the subject matter to the preceding 12 months. A suit shall not relate to any sitting earlier than 12 months before the day on which the suit is instituted (s 3(2)). This is a jurisdictional or substantive limit on what sittings can be the basis for the claim. It constrains the claimant’s right by defining recoverable conduct.

• Requirement of High Court originating process and service. The Act treats the day on which originating process is served as the cut-off for the initial $200 figure (s 3(1)(a)). That makes service operationally significant, and places a practical duty on claimants to effect and record service.

Rights displaced

• Abolition of s 46-based liability and suits. On and after commencement, persons are not liable to pay any sum under s 46 of the Constitution and no suit shall be instituted, continued, heard or determined under that section (s 4). That removes any residual enforcement rights or obligations that previously arose under s 46.

Scope of retroactivity

• Application to pre-commencement sittings. The Act applies to sittings occurring before commencement as well as after it, by the language "whether before or after the commencement of this Act" (s 3(1)). That subjects past conduct to the statutory liability, subject to the 12 month restriction in s 3(2).

What the Act does not do, by omission

• No criminal sanction. The Act prescribes monetary liability only. It does not create or stipulate criminal penalties for sitting while constitutionally incapable.

• No guidance on determining constitutional incapacity. The Act does not set out a procedural mechanism for determining whether a person has been "declared by the Constitution to be incapable of so sitting." It assumes that constitutional declarations are made under the Constitution itself.

• No alternative remedies or discretionary damages. Liability is fixed and statutory; the Act does not provide for compensatory damages beyond the fixed sums, nor for costs, nor for interest, nor for discretionary adjustment.

Practitioners should therefore treat the Act as a statute that confers a narrowly framed private monetary right, coupled with procedural and temporal constraints, and with an explicit instruction to the High Court to avoid double penalties.

The Act specifies the monetary penalty, the conditions under which it is enforceable, the exclusive judicial forum for enforcement, and a statutory limit on duplicative penalties. It also abolishes an alternative constitutional enforcement mechanism. Each element affects how enforcement actions will be prosecuted and defended.

Monetary penalty structure

• Fixed sums. The penalty is a fixed monetary liability: $200 in respect of having sat on or before the day on which originating process is served (s 3(1)(a)), and $200 for every day after that day on which the person is proved to have so sat (s 3(1)(b)). The amounts are statutory and non-discretionary in the Act’s text.

• Calculation mechanics. The Act sets up a two-part calculation anchored to service of originating process: an initial $200 in respect of past sitting on or before service and then $200 per day after service. Because s 3(2) limits the temporal reach of a suit to the 12 months prior to institution, the recoverable days will be those that fall within that statutory window. The text treats proof of sitting on each day as a precondition for the per-day recovery after service (s 3(1)(b)).

Enforcement forum and mechanics

• Exclusive original jurisdiction in the High Court. Section 5 confers original jurisdiction on the High Court in suits under the Act and excludes other courts. Enforcement must therefore be pursued as an original proceeding in the High Court. The Act does not prescribe procedure for how such suits are to be conducted beyond vesting the original jurisdiction in the High Court; procedural rules will follow ordinary High Court processes for originating process, service, evidence and judgment in the Court.

• Service-related cut-off. The day the originating process is served determines the initial $200 liability cut-off (s 3(1)(a)). Practically, claimants will need to establish the date and method of service to anchor the statutory calculation and to prove subsequent days of sitting. The Act does not specify what constitutes satisfactory proof of service, so claimants must comply with the High Court’s procedural requirements for service proof.

Temporal limit and retroactivity

• 12-month subject-matter limit. Section 3(2) bars suits from relating to sittings earlier than 12 months prior to institution. Enforcement is therefore limited to relatively recent sittings, even though s 3(1) allows application to conduct that occurred before commencement. The combination of retroactive application and a rolling 12-month window narrows the range of pre-commencement conduct that is actionable.

Non-duplication and interplay with other liabilities

• Prohibition on orders that penalise more than once. Section 3(3) directs the High Court to refuse to make any order that would, in the Court’s opinion, cause the person to be penalised more than once for any period or day of sitting. That operates as an explicit statutory obstacle to cumulative monetary penalties arising from multiple sources for identical periods.

• Displacement of s 46 of the Constitution. Section 4 removes liability under s 46 of the Constitution and prevents any suits under that constitutional section from being instituted, continued, heard or determined "on and after the date of commencement." The Act therefore centralises enforcement in the new statutory regime and extinguishes what would otherwise have been a constitutional enforcement path.

Practical enforcement consequences

• Concentration of litigation in one forum. All enforcement actions will route through the High Court. That concentrates litigation costs and procedural complexity in that jurisdiction and makes the High Court the gatekeeper for both claimant standing issues and evidentiary determinations.

• Incentive structure for private litigants. Because any person can sue and the penalty is recoverable by the successful private litigant, there is a private financial incentive to bring suits. How frequently that incentive will be realised depends on High Court costs, the ease of proof of sitting and the practicality of serving originating process.

• Defendants’ defensive considerations. A defendant confronted with an originating process faces potential daily sums, a High Court action, and the need to address the question whether they were "declared by the Constitution to be incapable" at the relevant times. The Act imposes no stay or alternative procedure while other constitutional mechanisms run; however s 3(3) guards against double penalisation if other penalties exist.

The Act therefore creates a narrow, quantified penalty regime that is enforced exclusively in the High Court, with procedural significance attached to originating process and service, a 12-month subject matter restriction, and an express displacement of the prior constitutional route.

The statutory text expressly engages with the Constitution and implicitly interacts with established jurisdictional rules and common law concepts. All interactions identified below are grounded in the Act’s wording.

Direct interaction with the Constitution

• Reference to constitutional declarations of incapacity. Section 3(1) predicates liability on sitting "while he or she was a person declared by the Constitution to be incapable of so sitting." The Act therefore presupposes the existence and operation of constitutional provisions that declare who is incapable of sitting. The Act does not define those constitutional provisions; it uses the Constitution as the substantive source of incapacity, and the statutory remedy applies where a person falls within that constitutional category.

• Displacement of section 46 enforcement. Section 4 expressly abolishes liability and suits under "section 46 of the Constitution" on and after commencement. That is an explicit statutory override of the enforcement function formerly available under s 46; after commencement s 46 no longer provides a route to recover sums or to litigate such claims. The Act therefore displaces a pre-existing constitutional enforcement mechanism and replaces it with the statutory process in s 3.

Interaction with judicial jurisdiction norms

• Exclusive original jurisdiction of the High Court. Section 5 confers original jurisdiction on the High Court in suits under the Act and denies jurisdiction to "any other court." That interacts with the general allocation of jurisdiction in law by making the High Court the only forum for this statutory cause of action. Any procedural or jurisdictional constraints that normally apply to High Court original jurisdiction will govern these suits, because the Act does not create an alternative forum.

• Non-cumulative penalty instruction. Section 3(3) requires the High Court to refuse to make orders that would penalise the defendant more than once for the same period or day. This interacts with other potential sources of penalty or liability for the same conduct by instructing the Court to avoid orders that would result in duplicate financial punishments. The Act therefore preserves a non-cumulative approach, as between the remedy under this statute and other mechanisms that might produce financial penalty for the same conduct.

Omissions and consequential interactions

• No procedural definitions for "originating process" or "service" within the Act. The statute relies on the existing procedural law for initiating High Court proceedings and for effecting service. In practice this means that the rules of court and common procedural law will determine how originating process is to be issued and served, and what proofs are acceptable. The Act’s substantive calculations are therefore interdependent with procedural law; failure to comply with procedural requirements could affect the statutory entitlement.

• Absence of definition of "sitting" or of evidential standards. The Act requires proof that the person "has sat" on specific days (s 3(1)(b)) but does not define how a day of sitting is to be proved. This interacts with evidentiary rules and parliamentary records. In practice, records of attendance, Hansard, roll calls or minutes will be relevant, but the Act itself does not set evidentiary thresholds.

• Interaction with limitation rules and retrospective application. The Act applies to conduct "whether before or after the commencement of this Act" (s 3(1)) but limits suits to sittings within 12 months prior to institution (s 3(2)). That hybrid of retroactivity and limitation interacts with general principles about retrospective legislation and limitation periods, but the text itself is self-contained: it reaches past conduct subject to the 12-month constraint.

Interplay with other potential statutory or constitutional consequences

• The Act does not address disqualification from sitting going forward, removal procedures, or other civil or criminal consequences. Any interaction with other statutory sanctions or parliamentary processes is therefore not addressed in the Act and will depend on other law. Section 3(3)’s prohibition on orders that would result in multiple penalties suggests a legislative intent to avoid cumulative monetary liability, but it does not prevent other non-monetary consequences if those arise under other parts of law unrelated to monetary penalties.

In sum, the principal, explicit interaction is with section 46 of the Constitution, which the Act abrogates as a route for liability and suits, and with the Constitution as the substantive source of incapacity. Procedural and evidentiary interactions flow to existing High Court practice and rules, which the Act assumes but does not prescribe.

The statutory text presented contains the enacted provisions without any appended amendment notes or marginal annotations. The source material lists five sections: short title (s 1), commencement (s 2), penalty for sitting when disqualified (s 3), prohibition of suits under section 46 of the Constitution (s 4), and jurisdiction (s 5). The text as provided does not include any subsequent amendment provisions, schedules or repeal lines, and does not record dates of amendment or replacement of text.

What the statutory text itself shows

• The Act is short and self-contained in five sections. There are no side-by-side versions or alternative wording in the provided text. Each section states its operative rule with no transitional or savings provisions beyond the explicit retroactive sweep of s 3(1) and the 12-month qualification in s 3(2).

• The commencement provision states that the Act comes into operation on the day it receives Royal Assent (s 2). There are no transitional amendments or staged commencements recorded in the text. There is also no schedule of savings for existing proceedings, save that s 4 extinguishes suits under s 46 of the Constitution "on and after the date of commencement."

What is not in the provided text

• No amendment history entries. The source as supplied contains no notes of amendment, repeal, or replacement by later Acts. It does not show legislative history such as bill numbers, dates of introduction, parliamentary debates, explanatory memoranda or reports. It does not show any statutory delegation for future amendments.

• No temporal amendment chain. The Act does not itself contain sunset clauses, review requirements, or mechanisms for automatic variation. It is silent on how future amendments would be made beyond the ordinary legislative process which is not detailed in the Act.

Implications for readers and researchers

• The absence of amendment notes in the text means that to determine whether the Act has been altered since this version was produced, one must consult an up-to-date legislative register or consolidated statute database. The Act as reproduced is the authoritative content for the period shown by the source, but the text alone does not confirm that it remains unamended.

• The Act’s operative language includes retroactivity (s 3(1)) and an explicit cut-off for temporal reach (s 3(2)), which are policy choices fixed in the text. Any legislative amendments altering those parameters would themselves need to be enacted and would be reflected by an amendment record in an official consolidation.

• Because the text removes the avenue under s 46 of the Constitution (s 4), any amendment that sought to restore s 46 remedies, or to adjust the monetary sums, would be a material change in enforcement design. There is no internal amendment procedure or delegated power in the Act to effect such changes.

Readers preparing authoritative advice or compliance materials should therefore treat the Act as a short, self-contained statute in its present form and, where up-to-date status is required, confirm currentness with an authoritative legislative consolidation before relying on the monetary figures or the displacement of s 46.

The statutory text does not contain or list any cases, judicial decisions or litigation outcomes; it does not include notes identifying proceedings under the Act, nor does it include judicial commentary or interpretive guidance. There is no litigation history recorded in the source material.

What this means for practitioners and researchers

• No precedent within the text. Because the statute as supplied contains no recorded judicial decisions, it provides no on-the-text interpretation, no reported High Court judgments construing the Act, and no concrete examples of how courts have applied provisions such as the interplay between s 3(1) and s 3(2), the proof required for days of sitting, or the High Court’s exercise of s 3(3) to avoid double penalisation.

• Expect initial High Court procedural questions. The Act confers original jurisdiction on the High Court (s 5). Without recorded litigation history in the statute, practitioners should expect that the first contested proceedings may raise threshold issues such as standing and locus standi of "any person" to sue, the meaning of "declared by the Constitution to be incapable," the proper proof of days of sitting, whether the 12-month restriction operates as a jurisdictional bar versus a limitation on remedy, the method of calculating the sums payable under s 3(1), and the operation of s 3(3) when other penalties exist. The Act itself does not resolve these questions.

• Absence of internal guidance for remedies and costs. The statute prescribes monetary sums but does not address ancillary matters such as costs, interest, enforcement of judgment, or interlocutory remedies. Litigation in the High Court under this Act will therefore necessarily be guided by general High Court practice and by judicial interpretation of the Act once litigated.

• No recorded interplay outcomes with s 46. Section 4 abolishes suits under s 46 on and after commencement. The statute does not indicate how ongoing or pending matters at the date of commencement are to be treated. The lack of litigation history in the text means there is no recorded judicial treatment of transitional or vested rights concerns in this source.

Practical consequence

• Need to review case law and court databases externally. To understand how courts have treated the Act, whether the High Court has accepted or rejected particular evidentiary approaches, how s 3(3) has been applied to prevent double penalisation, and whether any constitutional challenges to the Act’s displacement of s 46 have been mounted, it is necessary to consult judicial decisions and case law databases. The statute itself gives no litigation narrative.

• Expect issues of first impression to be litigated in the High Court. Because the Act concentrates jurisdiction in the High Court and abolishes s 46 remedies, any contested application of these novel statutory mechanics must, if litigated, be resolved in that forum. The Act’s lack of recorded litigation history in the text underscores that interpretive and procedural questions will have to be worked through in practice.

In short, the Act’s text provides no litigation record. Advice about how the Act has been applied in particular cases cannot be grounded on the statute alone; it requires external case-law research.

The Act’s brevity contains a number of interpretive and procedural pitfalls that can produce unexpected outcomes if they are not anticipated. The following points are grounded in the statutory text and explain where practitioners commonly run into difficulty.

Retroactive application combined with a rolling 12-month limit

• Read s 3(1) together with s 3(2). Section 3(1) applies "whether before or after the commencement of this Act" to persons who have sat while constitutionally incapable. That gives the Act retroactive reach. However s 3(2) states that "a suit under this section shall not relate to any sitting ... at a time earlier than 12 months before the day on which the suit is instituted." The practical gotcha is that, although the Act reaches pre-commencement conduct, a claimant cannot sue in respect of sittings that lie outside the 12-month window that immediately precedes institution. In particular, a claimant bringing a proceeding for pre-commencement conduct must ensure the sittings complained of fall within the 12-month period before institution. Failure to observe this will render the claim non-viable on its face.

Service date as an operational pivot

• The initial $200 component is tied to service. Section 3(1)(a) gives $200 "in respect of his or her having so sat on or before the day on which the originating process in the suit is served on him or her." That makes the service date the operational pivot for the initial component. Practitioners often underestimate the significance of service when drafting claims. If service is defective or not provable, the claimant may lose the benefit of the statutory sequence or the court may find uncertainty in the calculation. Establishing and proving effective service is therefore critical.

Ambiguity about what counts as "a day" of sitting

• The Act requires proof of days for per-day recovery (s 3(1)(b)) but does not define "day" or how attendance is to be established. Parliamentary practice varies. The gotcha is evidentiary: claimants must assemble contemporaneous records or other admissible proof that a person sat on particular days. Absent clear proof, the High Court will be left to determine whether proof is sufficient, and the Act supplies no default method.

Double-penalisation restraint in interaction with other remedies

• Section 3(3) instructs the High Court to refuse to make orders that would penalise the defendant more than once for the same period or day. But the Act does not identify which other penalties count for that purpose. The practical result is that parties must map out all potential sources of overlapping liability before judgment. If a defendant is subject to a prior financial penalty for the same period under a different instrument, a claimant’s recovery under this Act may be curtailed by s 3(3).

Displacement of section 46 and transitional uncertainty

• Section 4 prevents suits under s 46 "on and after the date of commencement." The Act does not expressly deal with suits already instituted under s 46 at commencement. The gotcha is transitional: practitioners must enquire whether a pending proceeding under s 46 is abated by this Act or whether it continues. The statutory text is silent; absent external legal history or judicial guidance, treating pending s 46 suits as automatically extinguished would be legally risky.

Exclusive High Court jurisdiction has cost and access consequences

• Section 5 channels all suits to the High Court as original proceedings. That concentrates litigation costs, increases procedural complexity and may make claims impractical for smaller private litigants. A claimant who lacks the resources to prosecute High Court litigation effectively may find the practical right to sue limited by access costs. The Act does not provide a lower cost alternative.

No provision for costs, interest or enforcement mechanisms

• The Act prescribes monetary sums but does not address ancillary remedies. The gotcha is that having a judgment is not the same as collecting the statutory sums: the Act does not specify enforcement mechanisms, whether interest attaches, or whether costs follow the event. Practitioners must therefore rely on general judgment enforcement law and High Court practice to secure payment.

Potential confusion over "declared by the Constitution"

• The Act depends on the phrase "declared by the Constitution to be incapable of so sitting." It is not self-evident from the statute when or how such a declaration occurs, whether it must be a prior judicial declaration, a parliamentary finding, or an administrative determination. The procedural origin of that declaration will be a critical contested question in litigation under the Act, and the Act does not answer it.

Timing traps for claimants

• Because of the 12-month restriction and the service pivot, claimants who delay may find recovered days limited to a smaller set. Claimants should consider timing and service strategy early, or risk restricting recoverable days.

In short, the principal practical pitfalls are: the interplay between retroactivity and the 12-month restriction, the procedural centrality of service, evidentiary difficulties about what constitutes a "day" of sitting, the consequences of exclusive High Court forum for cost and access, and uncertainty about transitional effects on existing s 46 proceedings and the meaning of constitutional "declaration."

Compliance in this statutory context takes two forms: steps persons at risk of liability should take to avoid exposure, and steps potential claimants should take to ensure the viability and enforceability of a claim. The Act’s text determines the legal triggers and procedural anchors that drive practical compliance measures.

For persons who hold or intend to hold parliamentary seats

• Monitor constitutional status. The Act imposes liability on those who have sat while they were "declared by the Constitution to be incapable of so sitting" (s 3(1)). A person who may be at risk should identify and, where possible, resolve any constitutional incapacity before participating in sittings. The statute does not set out the processes by which declarations of incapacity are made, so compliance requires attention to the constitutional processes and any relevant determinations under the Constitution.

• Avoid participating in sittings while a declaration of incapacity is operative. Because the Act applies to conduct "whether before or after commencement" (s 3(1)), caution is warranted even for past periods of uncertainty. Practical compliance includes ensuring that memberships are valid and, if in doubt, refraining from voting or attending sittings until eligibility is clarified.

• Preserve records of any remedial steps. If a person believes they are not constitutionally incapable, keeping documentary evidence of steps taken to address potential incapacity will be relevant in defending any claim under the Act, because the statutory regime turns on whether the person "was" declared by the Constitution to be incapable.

For potential claimants intending to sue

• Time your institution to fit the 12-month window. Section 3(2) prohibits suits relating to sittings earlier than 12 months before institution. Identify the sittings that are intended to be the basis of the suit and institute before that 12-month window closes. Where breaches are discovered late, claimants should act promptly to avoid the statutory bar.

• Use High Court originating process and prove service. The Act’s recovery framework depends on the day on which the originating process is served (s 3(1)(a)). Claimants must ensure originating process is issued in the High Court, properly served in compliance with High Court rules, and that proof of service is preserved. The service date affects the initial $200 component and the calculation of daily sums after service.

• Assemble and preserve proof of sittings. Because per-day liability requires proof that the person "is proved in the suit to have so sat" on each day after service (s 3(1)(b)), claimants must gather primary evidence of attendance for each contested day. Examples of relevant evidence include official parliamentary attendance records, Hansard references to attendance or participation, voting records, sign-in sheets, or any contemporaneous official documents evidencing presence. The Act itself does not specify acceptable proofs; compliance means preparing to meet the High Court’s evidentiary standards.

• Map other penalties and compliance obligations. Before commencing, identify any other penalties or financial liabilities that might be linked to the same days of sitting. Section 3(3) prevents orders that would penalise the defendant more than once for the same period. If other recoveries exist or are likely, the claim needs to be adjusted to account for s 3(3)’s constraint.

• Budget for High Court litigation. Because s 5 confines suits to the High Court, claimants should budget and prepare for original High Court proceedings, including cost estimates, expert evidence if needed, and procedural compliance. The Act does not provide a low-cost alternative forum.

For defendants responding to an originating process

• Contest the factual predicate and the declaration of constitutional incapacity. The statutory liability depends on the existence of a constitutional declaration of incapacity and proof of sittings. Defendants should evaluate whether they were in fact "declared by the Constitution to be incapable" and whether the claimant can prove sittings within the 12-month window.

• Challenge service or timing if appropriate. Because the initial $200 and the per-day sequence are tied to service and the date of institution, defendants should scrutinise whether service was properly effected and whether the claimable dates fall within the statutory 12-month window.

• Raise s 3(3) if other proceedings have produced penalties. If the defendant has been previously penalised for the same periods under other mechanisms, invoke s 3(3) to prevent duplicate financial penalties.

Ancillary compliance considerations

• Consider settlement or alternative dispute resolution early. Given the cost of High Court litigation and the fixed monetary sums at issue, parties may find settlement economically preferable. The Act does not preclude settlement, and doing so can forestall protracted high-cost proceedings.

• Preserve documentary proof and witness statements. For both claimants and defendants, maintaining records that show dates of sitting, communications about eligibility, and any declarations of incapacity will be essential. The statute places a factual, temporal and procedural burden on litigants that is best met with contemporaneous documents.

• Be aware of the abolition of s 46 suits. Section 4 makes clear that no suit may be instituted or continued in pursuance of s 46 of the Constitution on or after commencement. Parties should not attempt to pursue s 46 remedies in parallel or as substitutes for the remedies provided by the Act, because the statute expressly removes that route.

In practice, compliance means treating the Act as a narrowly drawn, time-sensitive statutory cause of action enforced only in the High Court, and structuring behaviour and litigation strategy around the Act’s service-related pivot, the 12-month subject matter restriction, the requirement that proof of days of sitting be established, and the prohibition against double penalty orders.