Applied law. The provisions of a State taxing law that apply in relation to a Commonwealth place "in accordance with the Commonwealth Act" (s 3). This means that when the Commonwealth Act picks up a State taxing law and applies it as Commonwealth law to a Commonwealth place, the result is an "applied law". The State then administers that applied law through its own authorities under this Act.

Commonwealth place. Defined as "a place in the State (not being the seat of Government) acquired by the Commonwealth for public purposes" (s 3). This mirrors the definition in s 52(i) of the Constitution and the Commonwealth Act. It includes land the Commonwealth owns or has acquired, but excludes the Australian Capital Territory. The practical identification of what counts as a Commonwealth place is critical: many federal facilities, from military bases to public housing on former Commonwealth land, may fall within the definition. Disputes over whether a specific parcel is a Commonwealth place trigger the certificate mechanism in s 11.

Mirror taxes. The scheme is built on the idea that State taxing laws are "mirrored" by Commonwealth applied laws. A "State taxing law" is defined by reference to the Commonwealth Act (s 3). The Commonwealth Act defines which State taxes it will mirror; typically these include payroll tax, land tax, stamp duties, and other imposts. The effect is that the same substantive tax applies regardless of whether the property is Commonwealth land, but the legal source changes. This avoids a constitutional vacuum but creates two parallel legal regimes for the same tax.

Modifications. A central operational concept. Section 7(1) requires a State taxing law to be read "with any modifications that are necessary or convenient" for two purposes: enabling effective operation alongside the corresponding applied law, and ensuring a taxpayer's combined liability under both laws is as nearly as possible the same as under the State law alone. This is a broad power. Regulations may prescribe specific modifications (s 7(2)), but the directive in s 7(1) operates automatically. The note after s 2 emphasises that the Act and the Commonwealth Act depend on an arrangement being made under s 5 of this Act and s 9 of the Commonwealth Act. Once that arrangement is made, the State taxing laws are taken to have always applied to Commonwealth places, but only from 6 October 1997, and not so as to impose liability for pre-1997 acts.

Corresponding applied law. A term used throughout the Act to link a State taxing law with its Commonwealth mirror. For example, s 7(1) refers to "a corresponding applied law" triggering the modification directive. It is defined in s 3 as "an applied law that corresponds to the State taxing law". This ensures that the State law is read consistently with its federal counterpart, avoiding double liability or gaps.

Exclusion by section 52(i) of the Constitution. A State taxing law is "excluded by section 52(i)" if it would be inapplicable to a Commonwealth place by reason only of that constitutional provision (s 3). The entire scheme assumes that s 52(i) would otherwise make State taxing laws invalid or inapplicable in Commonwealth places. The mirror tax mechanism is designed to override that constitutional bar. Several provisions (ss 8, 10, 12, 15) condition their operation on the finding that the State taxing law "is not excluded by section 52 (i)". This is the constitutional trigger for the validation and continuity rules.

Proceedings. Defined broadly to include "any proceedings, whether civil or criminal and whether original or appellate" (s 3). This means the provisions on continuation (s 8), no objection on duplicate grounds (s 9), and appeal treatment (s 10) cover the full range of litigation, including tax objections, court actions, and enforcement proceedings.

The Act directly affects three main groups. The first and largest group is any person or entity that occupies, uses, owns, or conducts business on a Commonwealth place in NSW. That includes tenants and licensees of Commonwealth property (airport retail lessees, defence base contractors, university lessees on federal land), the Commonwealth itself as a taxpayer on some taxes (e.g. fringe benefits tax is not state but the Commonwealth may be liable for state payroll tax as an employer on its own land), and private entities that have acquired former Commonwealth land that remains a Commonwealth place. For these taxpayers, the Act means they must comply with State taxing laws that would otherwise be constitutionally inapplicable. Their tax liability, however, is calculated as if the land were ordinary State land, so the substantive cost may not differ from what they would pay if the place were not Commonwealth. But the compliance burden includes dealing with State revenue authorities and potentially facing duplicate proceedings or modifying provisions.

The second group is State revenue authorities and other State officials. The Act gives them powers to administer applied laws (s 6) and to exercise functions under arrangements with the Commonwealth (s 5). This includes the Office of State Revenue (now Revenue NSW), the Chief Commissioner of State Revenue, and any other State authority defined broadly in s 3 to include a Minister, a court, a body created by State law, and an officer or employee of the State. These authorities gain jurisdiction over Commonwealth land that they would not otherwise have. They must also handle the complexity of determining whether a place is a Commonwealth place, applying modifications, and coordinating with federal authorities.

The third group is legal and professional advisers. Lawyers advising on property transactions, tax advisers preparing returns, and accountants dealing with payroll tax or land tax must understand the mirror tax structure. When advising a client on a Commonwealth place, they must determine whether an applied law applies, whether the State taxing law operates with modifications under s 7, and what rules govern proceedings. The existence of certificates under s 11 may affect evidence burdens in litigation. The no-objection rule in s 9 may surprise litigators.

The Act also affects the Commonwealth itself, but indirectly. The Commonwealth Act imposes obligations on the Commonwealth to ensure mirror taxes are collected and to pay amounts to the States (s 23(1) of the Commonwealth Act). This Act makes the State liable to pay the Commonwealth to enable that compliance, and appropriates money for that purpose (s 16). The Commonwealth may also be a taxpayer on its own land for certain taxes, such as stamp duty on leases or land tax if it is a lessee.

Finally, the Act has retrospective effect on liabilities from 6 October 1997 onwards (note after s 2, s 7(3)(a)). This means that anyone who had dealings with Commonwealth places in NSW since that date may have unknown or unassessed tax liabilities. The validation provision in s 12 can cure defects in past collections, but it may also impose new liabilities on taxpayers who thought they were exempt.

The Act imposes no new substantive tax duties; those arise from the underlying State taxing laws and the Commonwealth Act. However, it creates procedural duties and rights that affect how those taxes are administered and challenged.

Duties. The primary duty is to comply with an applied law as if it were a State taxing law. That means filing returns, paying tax, and providing information to State authorities. The duty is enforceable by State authorities under s 6, which empowers them despite any State law to the contrary. A taxpayer cannot argue that State authorities lack jurisdiction because the place is a Commonwealth place -- the Act explicitly confers that jurisdiction. There is also a duty to accept modifications that may affect the calculation of tax under s 7. If regulations prescribe modifications, taxpayers must apply them even if they differ from the literal text of the State taxing law. The duty to pay may arise from 6 October 1997 if arrangements are made, and the Act deems the State taxing law to have always applied from that date (note after s 2). That creates a retrospective compliance duty.

Rights. The Act preserves several rights. Taxpayers have the right to challenge the characterisation of a place as a Commonwealth place. Section 11 allows the use of certificates from an authorised person as evidence of ownership, but those certificates are not conclusive -- the taxpayer may rebut them, though the burden of proof may shift (the certificate is "evidence" and is presumed genuine unless the contrary is proved under s 11(2)). Taxpayers also have the right to continue proceedings under the correct law if they mistakenly start under an applied law when the place is not a Commonwealth place (s 8). Conversely, if they start under a State taxing law but duplicate proceedings exist under an applied law, they cannot rely on that fact alone as an objection (s 9). This means a taxpayer cannot avoid tax merely because the same matter is being pursued under both regimes.

On appeal, if a court finds that the State taxing law is not constitutionally excluded, the appeal must proceed as if the proceedings were under the State law (s 10). That gives the appellate court a duty to re-characterise the proceedings, which may affect the standard of review or available remedies. For example, if an appeal was lodged under an applied law and the place is later found to be non-Commonwealth, the appeal continues under the State taxing law, preserving the taxpayer's right to appeal.

The validation provisions in ss 12-14 give rights to have past actions recognised. If something was purportedly done under an applied law but the State taxing law was the correct source, it is regarded as having been done under the State law (s 12). This protects taxpayers who relied on assessments or rulings under the applied law -- they do not need to redo them. Similarly, when a place ceases to be a Commonwealth place, rights accrued under the applied law are preserved (s 13(3)). When a place becomes a Commonwealth place, rights under the State taxing law are preserved (s 14(2)). So taxpayers do not lose protections they had before the change.

State authorities have the right to exercise powers under applied laws, but they must also comply with any arrangement made under s 5. That arrangement may limit or define their powers. The authority to make regulations under s 17 is broad but must be for the purposes of the Act.

The Act itself does not prescribe specific penalties for non-compliance. Instead, it relies on the penalty provisions of the underlying State taxing laws (e.g. late payment penalties, interest, and offence provisions in the Taxation Administration Act 1996 (NSW) or specific Acts like the Land Tax Management Act 1956). However, the Act ensures that these penalties can be enforced in relation to Commonwealth places. Section 6 gives State authorities the power to impose penalties under an applied law. Section 13(3)(b) preserves any penalty incurred under an applied law even after that law ceases to have effect, and s 13(4) allows that penalty to be imposed as if the law had not ceased. Section 14(2)(c) similarly preserves penalties incurred under a State taxing law after it ceases to apply to a place that becomes a Commonwealth place, and s 14(3) allows enforcement.

The enforcement mechanism is therefore the same as for any State tax. State authorities can issue assessments, garnishee notices, freeze bank accounts, and prosecute offences under the State taxing laws. The only difference is the constitutional foundation: the applied law is Commonwealth law, but State authorities administer it. If a taxpayer fails to comply, the State can take recovery action under the applied law, and the restrictions of s 52(i) do not apply because the applied law is a Commonwealth law.

There is a specific enforcement tool in the certificate provision. Section 11 allows an authorised person (defined by reference to s 16 of the Commonwealth Act) to give a certificate about land ownership that is evidence of the matters stated. This can be used by the State to prove that a place is a Commonwealth place or that the Commonwealth owns it, which is often a prerequisite for the tax liability. The certificate is presumed genuine unless the contrary is proved (s 11(2)). That shifts the evidentiary burden to the taxpayer, making it easier for the State to establish jurisdiction.

The no-objection rule in s 9 prevents a taxpayer from objecting merely on the ground that duplicate proceedings exist. This means if the State brings an action under the State taxing law and the taxpayer knows there are parallel proceedings under the applied law, they cannot use that as a procedural defence. That reduces litigation tactics and reinforces the scheme's aim of seamless administration.

Criminal penalties for tax evasion under State laws apply equally. The definition of "proceedings" includes criminal proceedings (s 3), so enforcement of tax offences can take place under the applied law. Section 12 validates things purportedly done under an applied law, so if a prosecution was commenced under the wrong legal label but the place is not a Commonwealth place, it is still valid under the State law.

This Act interacts with three main legal regimes: the Commonwealth Act, the Constitution (especially s 52(i)), and State taxing laws generally.

Relationship with the Commonwealth Act. The two Acts are inseparable. The Commonwealth Act creates the applied laws; this Act gives them administrative life in NSW. Section 5 requires an arrangement between the Governor and the Governor-General to trigger the scheme. The note after s 2 makes clear that the operation of both Acts depends on such an arrangement. Section 6 of this Act gives State authorities powers that the Commonwealth Act authorises or requires. Section 16 appropriates money to meet the State's obligation under s 23(1) of the Commonwealth Act to pay the Commonwealth for its compliance costs. The definitions in s 3 cross-reference the Commonwealth Act for "State taxing law" and "authorised person". This Act cannot operate independently; it is the NSW counterpart to the Commonwealth's mirror tax scheme.

Constitutional interaction with s 52(i). The whole scheme is predicated on the constitutional immunity of Commonwealth places from State taxation without Commonwealth consent. Section 52(i) of the Constitution gives the Commonwealth exclusive power to make laws for Commonwealth places. The mirror tax mechanism is the Commonwealth's consent, by Commonwealth law, to State taxing provisions applying to those places. This Act's provisions repeatedly test whether a State taxing law is "excluded by section 52 (i)". If it is excluded, then the mirror mechanism is needed; if it is not excluded (e.g. because the land is not actually a Commonwealth place or the tax is not one caught by s 52(i)), then the State taxing law applies directly. The Act provides rules to switch between the two regimes without losing rights or invalidating proceedings.

Interaction with other State laws. Section 6 overrides any State law that would otherwise prevent a State authority from exercising its functions under the applied law. This is a form of paramountcy for the mirror tax scheme. Section 7(1) directs how State taxing laws must be read and construed in conjunction with applied laws, which may modify their effect. Regulations under s 7(2) can prescribe specific modifications that override the ordinary interpretation. Section 15 ensures that instruments (e.g. contracts, deeds, notices) that refer to an applied law are read as references to the State taxing law if that law is not constitutionally excluded. This prevents confusion when documents use the wrong nomenclature.

The Act also interacts with State procedural laws. For example, proceedings under an applied law are heard in State courts, and the Act provides continuity rules so that a change in the characterisation of the place does not derail litigation. The no-objection rule in s 9 limits the application of ordinary pleading rules about duplicity.

Validation and savings provisions. These interact with the general law of retrospectivity. Section 12 validates past acts done under an applied law when the correct law was the State law. Sections 13 and 14 preserve rights and liabilities when the status of a place changes. These provisions act as transitional rules that modify the normal common law rule that a change in jurisdiction affects pending matters.

The text provided does not contain an amendment history section or a table of amendments. It appears to be the current version as at the date of retrieval. The Act was originally assented to in 1998 (as per the title). The note after s 2 refers to an arrangement appearing in the Commonwealth Gazette of 20 February 2002, suggesting that the Act became operational from that date or shortly thereafter. The Act has likely been amended over time, but the provided source does not show any amendments. It is possible that the Act has been amended to update cross-references or to reflect changes in the Commonwealth Act, but no such amendments are evident in the text.

Given the instruction to rely only on the source, we cannot list amendments not present. The Act's commencement is by proclamation (s 2(1)), and s 2(2) provides that when an arrangement is made under s 5, s 7 is deemed to have come into operation on 6 October 1997. That is a retrospective commencement for the modification power. The note indicates the Act's retrospective effect but expressly limits it so as not to impose liability before 6 October 1997.

The Act does not contain a sunset clause. It appears to be ongoing. As a machinery Act, it is likely to remain in force as long as the Commonwealth Act exists and arrangements are in place.

The source does not refer to any specific court cases. However, the Act's provisions anticipate litigation in several areas. The most significant is disputes over whether a place is a Commonwealth place. The definition in s 3 requires the land to be "acquired by the Commonwealth for public purposes". This has been the subject of considerable High Court and Federal Court litigation in other contexts (e.g. Allders International Pty Ltd v Commissioner of State Revenue (Vic) (1996) 186 CLR 420, which dealt with the old Commonwealth Places (Application of Laws) Act). The mirror tax scheme was introduced partly to overcome the problems highlighted in such cases. Under this Act, s 11 provides a certificate as evidence of ownership, but that does not eliminate the ability to litigate the issue. Since the certificate is only evidence, not conclusive, a taxpayer may still lead evidence to show the land was not acquired for public purposes or was acquired before federation, etc.

Another likely area is the application of s 7 modifications. Taxpayers may argue that a modification prescribed by regulation is not "necessary or convenient" for the purposes set out in s 7(1), or that it operates retrospectively beyond 6 October 1997. The validity of regulations made under s 7(2) could be challenged on administrative law grounds.

The no-objection rule in s 9 could be tested. A taxpayer might argue that having two sets of proceedings (one under the applied law and one under the State law) is fundamentally unfair or an abuse of process. The Act says the objection cannot be upheld "merely on that ground", but it does not prevent other grounds. Courts may need to decide whether the existence of duplicate proceedings can be a factor in a broader challenge.

The validation provisions in ss 12-14 could also generate litigation. For example, if an assessment was issued under the applied law but the place was later found not to be a Commonwealth place, s 12 treats the assessment as valid under the State law. A taxpayer might argue that the assessment was procedurally defective because it referred to the wrong law, and that s 12 does not cure that defect. Similarly, the preservation of rights in ss 13 and 14 may raise questions about what constitutes a "right, privilege, obligation or liability" that is preserved.

Despite these possibilities, the Act is designed to minimise litigation by ensuring continuity and validation. The absence of reported cases in the source does not mean no cases exist; it simply means the text does not cite them. A practitioner would need to search case law databases.

Retrospectivity and deemed commencement. The Act's operation depends on an arrangement under s 5. Once that arrangement is made, s 7 is deemed to have come into operation on 6 October 1997 (s 2(2)). The note explains that State taxing laws are then taken to have always applied to Commonwealth places, but without imposing liability for pre-6 October 1997 acts. This means that transactions or events from October 1997 until the arrangement date (which may have been in 2002) may suddenly become taxable. Taxpayers who thought they had no State tax liability on Commonwealth land could face back assessments. The limitation is that no liability arises for things before 6 October 1997, but anything after that date is potentially captured.

Modifications may change the tax. Section 7(1) requires State taxing laws to be read with modifications necessary to make the combined liability as nearly as possible the same as it would be if the places were not Commonwealth. But the "as nearly as possible" standard leaves room for discrepancies. Regulations can prescribe modifications, and those modifications may have retrospective effect (s 7(3)(a)). A taxpayer might find that a regulation issued years later reduces or increases their tax liability for past periods. The retrospective modification power is constrained only by the non-imposition of liability before 6 October 1997, but it can still alter the calculation of tax for periods after that date.

Certificate as evidence. Section 11 allows an authorised person to give a certificate about land ownership. The certificate is evidence of the matters stated, and it is presumed genuine unless the contrary is proved. This effectively reverses the burden of proof on the issue of whether a place is a Commonwealth place. While the taxpayer can rebut the certificate, doing so may require obtaining evidence from the Commonwealth about the acquisition history, which may be difficult or expensive.

No objection on duplicate proceedings. Section 9 prevents a taxpayer from objecting merely because there are duplicate proceedings under the applied law. This can be a trap for litigators. If the State starts an action under the State taxing law and the taxpayer knows there are already proceedings under the applied law (perhaps initiated by the taxpayer), they cannot use that as a defence. The court can still consider other grounds, but the mere duplication is not a bar.

Appeal treatment. Under s 10, if an appeal is brought from a decision under an applied law, and the court finds the State taxing law is not constitutionally excluded, the appeal must be dealt with as if the original proceedings were under the State law. That may change the applicable appeal procedures, grounds, or time limits. A party might lose a procedural advantage they had under the applied law's appeal regime.

Instrument references. Section 15 provides that an instrument referring to an applied law is to be read as referring to the State taxing law if the latter is not excluded. This could trap parties who draft contracts or deeds that refer to the applied law. The reference is automatically converted, which may alter the legal effect of the instrument. For example, a deed that says "this lease is subject to the applied law" may be interpreted as subject to the State taxing law, which may have different provisions.

State appropriation. Section 16 appropriates money from the Consolidated Fund to meet any liability to pay the Commonwealth under s 23(1) of the Commonwealth Act or under an arrangement. This means that if the Commonwealth incurs costs in administering the mirror taxes, the State must reimburse it. That cost is ultimately borne by NSW taxpayers, including those on Commonwealth places, but it is not a direct tax. The appropriation is automatic, giving the government a blank cheque to pay the Commonwealth.

Compliance with the mirror tax regime requires a practical grasp of whether your land or activity is on a Commonwealth place. The substantive tax obligations are identical to those under the relevant State taxing law (e.g. payroll tax, land tax, duty). The key difference is that you must determine which legal source applies, and you must accept the possibility of modifications.

Step 1: Determine if the place is a Commonwealth place. Check the land title. If the Commonwealth owns the land or has acquired it for a public purpose (e.g. airport, defence base, postal facility, federal office), it is likely a Commonwealth place. If uncertain, you can request a certificate from the State authority under s 11 (or the Commonwealth under s 16 of the Commonwealth Act). The certificate is evidence of ownership, but you may need to obtain legal advice on the definition of "acquired for public purposes". Some land may have been transferred to the Commonwealth before 1901 or under different legislative schemes.

Step 2: Identify the corresponding applied law. The Commonwealth Act specifies which State taxing laws are mirrored. In practice, the relevant applied law will be a Commonwealth regulation or notice. For example, if the State taxing law is the Land Tax Management Act 1956, the applied law will be a Commonwealth ordinance that picks up that Act with modifications. You need to locate that applied law (usually on the Federal Register of Legislation) and read it alongside the State law.

Step 3: Apply modifications. Section 7 of this Act requires you to read the State taxing law with any modifications necessary to achieve the combined liability goal. Check if regulations under s 7(2) have been made prescribing modifications. These may adjust rates, thresholds, or exemptions. If no regulations exist, you must still apply modifications that are "necessary or convenient" to ensure your total liability under both laws equals what it would be under the State law alone. This may require you to calculate tax under both the State law and the applied law, then adjust to avoid double counting or gaps.

Step 4: File returns and pay tax. You must file returns and pay tax to the State revenue authority as if the place were not a Commonwealth place. The authority has full jurisdiction under s 6. Use the same forms and procedures as for State tax, but note that the legal basis for the assessment will refer to the applied law. Keep records of the place's status and any modifications applied.

Step 5: Handle disputes. If you disagree with an assessment, you can object or appeal under the State taxing law's objection and review procedures. However, if you also have proceedings under the applied law, s 9 prevents you from objecting on that ground alone. If you started an appeal under the applied law and later discover the place is not a Commonwealth place, the appeal continues under the State law (s 10). Consider seeking a certificate under s 11 to clarify the status early.

Step 6: Monitor status changes. If the Commonwealth sells or acquires land, the place may change status. Sections 13 and 14 automatically adjust the applicable law without losing past rights or liabilities. Notify the revenue authority of the change. If a place ceases to be a Commonwealth place, you will need to comply with the State taxing law from that time. If it becomes a Commonwealth place, you will need to comply with the applied law.

Step 7: Review historical periods. Given the retrospective operation from 6 October 1997, review past transactions on Commonwealth places. You may have unassessed liabilities. Consider voluntary disclosure to the State revenue authority to reduce penalties. The validation in s 12 means that any prior dealings under the wrong legal label are likely valid, but you should ensure you have paid the correct amount.

Step 8: Seek professional advice. The interaction of two legal regimes, possible modifications, and the evidentiary burden of certificates make this area complex. Engage a tax lawyer or accountant experienced with mirror taxes. They can help determine the correct treatment, especially for large properties or complex transactions like leases, subleases, or development on Commonwealth land.