{"id":"C2004A05278","name":"Superannuation Contributions Tax (Members of Constitutionally Protected Superannuation Funds) Imposition Act 1997","slug":"superannuation-contributions-tax-members-of-constitutionally-protected-superannuation-funds-impositi","collection":"act","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":"184 of 1997","makingDate":null,"administeringDepartment":null,"currentVersion":{"id":27230,"registerId":"commonwealth-C2004A05278-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Short title [see Note 1]","content":"#### 1 Short title \\[see Note 1\\]\n\n  This Act may be cited as the Superannuation Contributions Tax (Members of Constitutionally Protected Superannuation Funds) Imposition Act 1997.","sortOrder":0},{"sectionNumber":"2","sectionType":"section","heading":"Commencement [see Note 1]","content":"#### 2 Commencement \\[see Note 1\\]\n\n  This Act commences on the day on which it receives the Royal Assent.","sortOrder":1},{"sectionNumber":"3","sectionType":"section","heading":"Interpretation","content":"#### 3 Interpretation\n\n  Expressions used in this Act that are defined by the Superannuation Contributions Tax (Members of Constitutionally Protected Superannuation Funds) Assessment and Collection Act 1997 have the same meanings as in that Act.","sortOrder":2},{"sectionNumber":"4","sectionType":"section","heading":"Imposition of superannuation contributions surcharge","content":"#### 4 Imposition of superannuation contributions surcharge\n\n  The superannuation contributions surcharge that is payable on a member’s surchargeable contributions for a financial year under the Superannuation Contributions Tax (Members of Constitutionally Protected Superannuation Funds) Assessment and Collection Act 1997 is imposed by this Act.\n\n> Note: Surcharge is not payable for the financial year that began on 1 July 2005 or a later financial year—see subsection 8(1) of the Superannuation Contributions Tax (Members of Constitutionally Protected Superannuation Funds) Assessment and Collection Act 1997.","sortOrder":3},{"sectionNumber":"5","sectionType":"section","heading":"Rate of superannuation contributions surcharge","content":"#### 5 Rate of superannuation contributions surcharge\n\n  (1A) In this section:\n\n> higher income amount means:\n\n    (a) for the 2003‑2004 financial year—$114,981; and\n    (b) for the 2004‑2005 financial year—that amount as indexed under section 7.\n\n> lower income amount means:\n\n    (a) for the 2003‑2004 financial year—$94,691; and\n    (b) for the 2004‑2005 financial year—that amount as indexed under section 7.\n\n> maximum surcharge percentage means:\n\n    (a) for the 2003‑2004 financial year—14.5%; and\n    (b) for the 2004‑2005 financial year—12.5%.\n  (1) Unless subsection (4) applies, if the member’s adjusted taxable income for a financial year (relevant adjusted taxable income) is not less than the lower income amount but is less than the higher income amount, the rate of the superannuation contributions surcharge that applies to the member for that year is the percentage (calculated to 5 decimal places) of the member’s surchargeable contributions for that year worked out using the formula:\n\n![](image.002.png)\n\n  where:\n\n> A is:\n\n![](image.003.png)\n\n  (2) If the percentage calculated under subsection (1) for a financial year would, if it were worked out to 6 decimal places, end with a number greater than 4, the number so calculated is increased by 0.00001.\n  (3) If the member’s adjusted taxable income for a financial year is equal to, or greater than, the higher income amount, the rate of the superannuation contributions surcharge that applies to the member for that year is the maximum surcharge percentage of the member’s surchargeable contributions for that year.\n  (4) If:\n    (a) the member has not quoted his or her tax file number to the Commissioner in connection with the operation or the possible future operation of the Superannuation Contributions Tax (Members of Constitutionally Protected Superannuation Funds) Assessment and Collection Act 1997; and\n    (b) the Commissioner has not, after taking all reasonable steps, found out the member’s tax file number; and\n    (c) the Commissioner has written a letter to the member at the member’s last‑known address telling the member that, if the member does not quote his or her tax file number, the rate of surcharge that will apply to the member for a financial year (the relevant financial year) may be the maximum surcharge percentage of the member’s surchargeable contributions for that year;\n  the following provisions have effect:\n    (d) if contributed amounts in respect of contributions began to be paid for or by the member to a superannuation provider before 7 May 1997 and the member’s surchargeable contributions for the relevant financial year exceed the surchargeable contributions threshold—the rate of surcharge that applies in respect of the member’s surchargeable contributions for the relevant financial year is the maximum surcharge percentage of those contributions;\n    (e) if contributed amounts in respect of contributions began to be paid for or by the member to a superannuation provider before 7 May 1997 and the member’s surchargeable contributions for the relevant financial year do not exceed the surchargeable contributions threshold—the rate of surcharge that applies in respect of the member’s surchargeable contributions for the relevant financial year is nil;\n    (f) subject to subsection (5), if no contributed amounts in respect of contributions began to be paid for or by the member to a superannuation provider before 7 May 1997—the rate of surcharge that applies in respect of the member’s surchargeable contributions for the relevant financial year is the maximum surcharge percentage of those contributions.\n  (5) If:\n    (a) the Commissioner has written a letter to a member as mentioned in paragraph (4)(c); and\n    (b) the member has not quoted his or her tax file number as mentioned in paragraph (4)(a) within 3 months after the letter was sent;\n  paragraph (4)(f) does not apply in respect of the member unless the Commissioner has, after that period, written a further letter to the member:\n    (c) to an address determined by the Commissioner as most appropriate for the letter to reach the member; and\n    (d) in the same terms as the earlier letter.","sortOrder":4},{"sectionNumber":"6","sectionType":"section","heading":"Surchargeable contributions threshold","content":"#### 6 Surchargeable contributions threshold\n\n  Surchargeable contributions threshold for the 1996‑97 financial year\n  (1) The surchargeable contributions threshold for the 1996‑97 financial year is $2,000.\n  Surchargeable contributions for a later financial year\n  (2) The surchargeable contributions threshold for a financial year (the relevant financial year) after the 1996‑97 financial year is the amount worked out using the formula:\n\n![](image.004.png)\n\n  where:\n\n> previous threshold means the surchargeable contributions threshold for the financial year immediately before the relevant financial year.\n\n> indexation factor means the number worked out under subsections 10(4) and (5) of the Superannuation Contributions Tax (Members of Constitutionally Protected Superannuation Funds) Assessment and Collection Act 1997 for the relevant financial year.\n\n> current charge percentage means the number that is specified in subsection 19(2) of the Superannuation Guarantee (Administration) Act 1992 for the quarter beginning on 1 July of the relevant financial year.\n\n> previous charge percentage means the number that is specified in subsection 19(2) of the Superannuation Guarantee (Administration) Act 1992 for the quarter beginning on 1 July of the financial year immediately before the relevant financial year.","sortOrder":5},{"sectionNumber":"7","sectionType":"section","heading":"Indexation","content":"#### 7 Indexation\n\n  Indexation of certain amounts for 2004‑05 financial year\n  (1) Section 5 applies in relation to an indexing financial year as if each indexable amount were replaced by the amount worked out using the formula:\n\n![](image.005.png)\n\n  where:\n\n> previous indexable amount means the indexable amount for the financial year immediately before the indexing financial year.\n\n> relevant indexation factor means the indexation factor for the indexing financial year.\n\n  Rounding off of indexed amounts\n  (2) If an amount worked out under subsection (1) is an amount of dollars and cents:\n    (a) if the number of cents is less than 50—the amount is to be rounded down to the nearest whole dollar; or\n    (b) otherwise—the amount is to be rounded up to the nearest whole dollar.\n  Indexation factor\n  (3) The indexation factor for an indexing financial year is the number calculated, to 3 decimal places, using the formula:\n\n![](image.006.png)\n\n  where:\n\n> current March year means the period of 12 months ending on 31 March immediately before the indexing financial year.\n\n> previous March year means the period of 12 months immediately before the current March year.\n\n  Rounding up of indexation factor\n  (4) If the number calculated under subsection (3) for a financial year would, if it were worked out to 4 decimal places, end with a number greater than 4, the number so calculated is increased by 0.001.\n  Change in index numbers\n  (5) If, at any time, whether before or after the commencement of this Act, the Australian Statistician has published or publishes an index number for a quarter in substitution for an index number previously published for the quarter, the publication of the later index number is to be disregarded.\n  Indexable amounts to be published\n  (6) The Commissioner must publish before, or as soon as practicable after, the start of the 2004‑05 financial year the indexable amounts as replaced under subsection (1) for that year.\n  Definitions\n  (7) In this section:\n\n> indexable amount means:\n\n    (a) an amount stated in section 5; or\n    (b) if that amount has previously been altered under this section—the altered amount.\n\n> indexing financial year means the 2004‑05 financial year.\n\n> index number, for a quarter, means the estimate of full‑time adult average weekly ordinary time earnings for the middle month of the quarter published by the Australian Statistician.\n\n> Note: For the purposes of this section, Australian Statistician means the Australian Statistician referred to in subsection 5(2) of the Australian Bureau of Statistics Act 1975.","sortOrder":6}],"analysis":{"issue_detection":{"absurdities":[{"type":"other","section":"4 and Note to Section 4","severity":"medium","reasoning":"The operative provision in section 4 imposes the surcharge in present tense ('is imposed by this Act'), while the note acknowledges surcharge is not payable for 2005-06 onwards. The Act has been a legal nullity in practical effect for nearly two decades. While the note references the Assessment Act for the operative limitation, the Imposition Act itself continues to impose something that cannot be triggered, creating a permanently hollow legislative instrument.","confidence":0.82,"description":"The Act imposes a tax that, by its own note, cannot be payable for any financial year from 2005-06 onwards. The Act effectively imposes a surcharge that has been permanently inoperative since 1 July 2005, yet continues to exist as active legislation."},{"type":"impossible_compliance","section":"5(1A) and 7","severity":"medium","reasoning":"Section 5(1A) introduces defined amounts only from 2003-04 onwards, but the surcharge was operative from 1996-97. The Act provides no mechanism within section 5 itself for calculating rates applicable to earlier financial years, suggesting the rate provisions rely entirely on external instruments or earlier versions not visible in this text, creating apparent incompleteness on the face of the Act.","confidence":0.72,"description":"The definitions of 'higher income amount' and 'lower income amount' in section 5(1A) only define values for the 2003-2004 and 2004-2005 financial years, and section 7 only applies indexation for the 2004-05 financial year. No rates or thresholds are defined for any prior financial years (1996-97 through 2002-03), leaving the rate mechanism with an apparent gap for those years."},{"type":"impossible_compliance","section":"5(4)(c) and 5(5)","severity":"low","reasoning":"The framework purports to protect members by requiring notification, but the protection is illusory when the address is unknown. The Commissioner must write to a 'last-known address' and then, per s5(5), to 'an address determined by the Commissioner as most appropriate' — which could be the same address. The procedure achieves nothing for an untraceable member but imposes mandatory compliance steps on the Commissioner before the rate can apply.","confidence":0.68,"description":"The procedure for applying maximum surcharge to members who have not quoted their tax file number creates a Kafkaesque notification loop. A member who never receives the initial letter (sent to 'last-known address') is subjected to maximum surcharge under paragraph (4)(f), yet subsection (5) requires a second letter before (4)(f) applies — but only after a 3-month waiting period from the first letter. If the member's address is genuinely unknown, both letters are futile, yet the Commissioner must exhaust this process before the rate applies, creating procedural overhead with no practical protective effect for the member."},{"type":"other","section":"7(5)","severity":"medium","reasoning":"While this is a common legislative drafting technique to achieve certainty and prevent retrospective recalculation, it produces the logically absurd outcome that deliberately incorrect data (the superseded figure) must be used over the Statistician's own corrected and more accurate figure. The clause privileges legal certainty over factual accuracy in a manner that could produce assessments known to be based on erroneous statistics.","confidence":0.75,"description":"Section 7(5) directs that if the Australian Statistician publishes a substituted index number, the later (corrected) number is to be disregarded. This means the Act mandates use of known incorrect statistical data over corrected figures, potentially entrenching calculation errors into law."},{"type":"other","section":"6(2)","severity":"low","reasoning":"The formula was designed anticipating annual changes in the SG percentage, but legislated freezes in that percentage mean the charge percentage ratio collapses to 1 for those years, making the variable redundant. This is a design flaw rather than a strict logical impossibility, but it demonstrates the formula does not achieve its apparent purpose during stable SG percentage periods.","confidence":0.6,"description":"The surchargeable contributions threshold formula for financial years after 1996-97 incorporates the 'current charge percentage' and 'previous charge percentage' from the Superannuation Guarantee (Administration) Act 1992. Once the SG charge percentage ceases to change year-on-year (as it did after reaching 9.5% and remaining flat for several years), the ratio of current to previous charge percentage becomes exactly 1, rendering that component of the formula neutral. This is not an absurdity per se but means the formula contains a variable that has been effectively inoperative for extended periods, suggesting poor legislative design."},{"type":"other","section":"7(7) - 'indexing financial year' definition","severity":"medium","reasoning":"A dedicated indexation section that can only operate for a single financial year is an unusual legislative construction. It suggests the Act was drafted with knowledge that the surcharge would be abolished after 2004-05, but the indexation machinery is architecturally presented as a general mechanism when it is in fact a one-shot provision. This creates a misleadingly general framework for a single-use operation.","confidence":0.85,"description":"The definition of 'indexing financial year' is restricted to only the 2004-05 financial year. Section 7 therefore provides an indexation mechanism that can only ever operate once. After 2004-05, the indexed amounts become static by operation of the Act itself, with no further indexation possible under this mechanism."}],"contradictions":[{"severity":"medium","section_a":"4 (imposition of surcharge in present tense, no temporal limit)","section_b":"Note to Section 4 (surcharge not payable from 1 July 2005)","confidence":0.8,"description":"Section 4 imposes the surcharge without any temporal limitation on its face, while the note acknowledges it is not payable for 2005-06 and later years. The operative imposition provision and the practical effect are directly contradicted, with the limitation buried in a non-binding note referencing external legislation rather than appearing in the operative text of this Act."},{"severity":"high","section_a":"5(1) (rate applicable when adjusted taxable income is between lower and higher income amounts)","section_b":"5(4) (maximum surcharge percentage applies regardless of income when TFN not quoted)","confidence":0.78,"description":"Section 5(1) establishes a graduated rate mechanism based on the member's adjusted taxable income. Section 5(4) overrides this entirely when a TFN has not been quoted, applying maximum surcharge regardless of actual income level. This means a member with income below the lower income amount — who would ordinarily pay no surcharge — is subjected to the maximum rate solely due to non-quotation of a TFN, even if their income genuinely falls below the threshold. The income-based structure is fundamentally contradicted by the TFN penalty override."},{"severity":"medium","section_a":"5(4)(d) and (e) (nil rate available for pre-7 May 1997 members below surchargeable contributions threshold)","section_b":"5(4)(f) (maximum rate applies to post-7 May 1997 members with no threshold protection)","confidence":0.82,"description":"Members who began contributing before 7 May 1997 receive a nil surcharge rate if their surchargeable contributions do not exceed the threshold (paragraph (e)), providing meaningful protection. Members who began contributing after 7 May 1997 receive no equivalent nil-rate protection under paragraph (f) — maximum surcharge applies regardless of contribution level. This creates an internally contradictory treatment within the same subsection based solely on the commencement date of contributions, with no evident policy logic for denying threshold protection to later members."},{"severity":"low","section_a":"7(3) (indexation factor calculated to 3 decimal places)","section_b":"7(4) (rounding up if 4th decimal place is greater than 4)","confidence":0.7,"description":"Section 7(3) directs calculation to 3 decimal places, implying the result is a 3-decimal figure. Section 7(4) then instructs rounding up based on what the 4th decimal place would be — requiring a calculation that section 7(3) ostensibly does not produce. The subsections require simultaneous calculation to both 3 and 4 decimal places, creating a minor internal procedural contradiction about the precision to which the initial calculation must be performed."},{"severity":"high","section_a":"5(1) (rate formula applicable to financial years generally)","section_b":"5(1A) (definitions only cover 2003-04 and 2004-05 financial years)","confidence":0.74,"description":"Section 5(1) applies the rate formula for 'a financial year' without restriction, but section 5(1A) only defines the 'lower income amount', 'higher income amount', and 'maximum surcharge percentage' for the 2003-04 and 2004-05 financial years. The formula in subsection (1) references these defined terms, which are undefined for all earlier financial years covered by the Act (1996-97 to 2002-03), leaving the formula inoperable for those years on the face of the Act."}]},"kimi_summary":{"_metrics":{"source":"grok-batch-everything"},"content_quality":"ok","complexity_score":7,"scope_assessment":{"changed":false,"description":"The legislation's scope has not grown beyond its original intent of imposing the surcharge on members of constitutionally protected funds; the core imposition mechanism in s.4 and the rate and threshold rules remain tied to the original policy of applying equivalent taxation to protected public sector style funds, with the post-2005 abolition effected only through the companion assessment legislation rather than any expansion of this Imposition Act itself."},"complexity_factors":["Highly conditional rules in s.5(4) and s.5(5) that create different outcomes depending on tax file number status, pre-7 May 1997 contribution start dates, and whether multiple letters have been sent by the Commissioner","Multiple embedded mathematical formulas (with rounding rules to 5 or 6 decimal places) in s.5(1), s.5(2), s.6(2), s.7(1), s.7(3) and s.7(4)","Heavy cross-referencing to the Superannuation Contributions Tax (Members of Constitutionally Protected Superannuation Funds) Assessment and Collection Act 1997 for all defined terms and to the Superannuation Guarantee (Administration) Act 1992 for charge percentages","Detailed indexation machinery in s.7 that uses Australian Statistician full-time adult average weekly ordinary time earnings data, substitution rules for index numbers, and publication obligations on the Commissioner","Separate definitions for 'higher income amount', 'lower income amount', 'maximum surcharge percentage' and 'indexable amount' that change by financial year"],"plain_english_summary":"**This Act imposes a tax known as the superannuation contributions surcharge on contributions made for or by members of constitutionally protected superannuation funds (special funds, often for public sector workers, that are shielded from direct taxation by the Australian Constitution).**\n\nIt works together with a separate Assessment and Collection Act that does the actual calculations and collections. The surcharge only applies to people whose adjusted taxable income exceeds set thresholds. The rate is zero below the lower threshold, gradually increases on a sliding scale between the lower and higher income amounts, and hits the maximum rate (originally 14.5%, later 12.5%) once income reaches the higher threshold. Special rules apply if the member has not provided their tax file number to the tax office.\n\nThe Act also defines a 'surchargeable contributions threshold' (starting at $2,000 in 1996-97) that is indexed each year, and it sets out how income thresholds and rates are adjusted for inflation using Australian Bureau of Statistics earnings data. A note in the Act makes clear that no surcharge is payable for the year starting 1 July 2005 or any later year. \n\nIt matters because it extended surcharge rules to funds that could not otherwise be taxed directly, promoting fairness between different types of superannuation arrangements for high-income earners."},"summary":{"complexity_score":7,"scope_assessment":{"changed":true,"description":"The original scope was to impose an ongoing surcharge on high-income superannuation contributors in constitutionally protected funds. However, the Act's practical scope was materially narrowed by the abolition of the surcharge for all financial years from 1 July 2005 onward (noted in section 4). What was designed as a permanent taxing mechanism is now effectively a historical instrument with only residual relevance for pre-2005 legacy liabilities."},"complexity_factors":["Requires reading alongside a companion Act (Assessment and Collection Act 1997) — neither Act is fully self-contained","Mathematical formulae embedded in the legislation for calculating surcharge rates and indexation (images referenced, not reproduced as text)","Multiple conditional rate structures depending on income brackets, TFN provision status, and contribution start dates (pre/post 7 May 1997)","Double-indexation mechanism: both income thresholds AND the surchargeable contributions threshold are indexed using different methods and reference periods","Rounding rules specified to 5-6 decimal places, adding technical precision requirements","Cross-references to multiple external Acts (Superannuation Guarantee Administration Act 1992, Australian Bureau of Statistics Act 1975)","The constitutional distinction underpinning the Act's existence (why a separate imposition Act is needed) requires specialist constitutional law knowledge to understand","Largely obsolete post-2005, creating risk of confusion about current applicability"],"plain_english_summary":"## What This Law Does\n\nThis Act is one piece of a two-part legal mechanism that **imposes a tax surcharge on superannuation contributions** made by members of a specific, narrow category of super funds called **\"constitutionally protected superannuation funds\"** (CPFs — these are certain government and public sector super funds that have special constitutional status, meaning the federal government cannot directly tax them the same way as ordinary super funds).\n\nThis Act's sole job is to *formally impose* the surcharge — it says \"yes, this tax exists and is legally valid.\" A companion Act (the Assessment and Collection Act 1997) handles all the administrative details of calculating and collecting the tax.\n\n## Who Is Affected?\n\n- **Members of certain government/public sector super funds** (e.g., some state public servant funds with constitutional protection)\n- **High-income earners only** — the surcharge only kicks in for people earning above a lower income threshold (around $94,691 in 2003-04), and reaches its maximum rate for those earning above a higher threshold (around $114,981 in 2003-04)\n- **Practically speaking, this tax is now largely historical** — the surcharge was abolished for financial years starting from 1 July 2005 onward\n\n## How Much Was the Tax?\n\nThe surcharge rate was calculated on a sliding scale:\n- **Below the lower income threshold**: no surcharge\n- **Between the lower and higher thresholds**: a graduated rate (up to 14.5% in 2003-04, reduced to 12.5% in 2004-05)\n- **Above the higher threshold**: maximum rate applies (14.5% or 12.5%)\n\nBoth the income thresholds and the surcharge rate were **indexed annually** using average weekly earnings data from the Australian Bureau of Statistics.\n\n## The Tax File Number Catch\n\nIf a member **refused to provide their Tax File Number (TFN)**, the ATO could apply the maximum surcharge rate regardless of their actual income — acting as a penalty for non-disclosure.\n\n## Why Does This Matter Today?\n\nFor most people, this Act is **effectively dormant** — the surcharge no longer applies after 2005. However, it may still be relevant for:\n- People with **historical superannuation debt** from before 2005\n- Legal and compliance professionals dealing with **legacy fund administration**\n- Anyone researching the history of Australia's superannuation tax policy"},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The Act establishes and prescribes the superannuation contributions surcharge (ss 4–7). The text itself records that surcharge is not payable for any financial year beginning on or after 1 July 2005 (note to s 4), which removes the operational application of the surcharge for those later years and therefore changes the effective temporal scope of the charge compared with its original imposition provisions."},"complexity_factors":["Mathematical rate formula with interpolation between income bands (s 5(1))","Multiple rounding rules that affect numerical results (s 5(2); s 7(2),(4))","Indexation mechanics tied to ABS wage series and prior year factors (s 6(2); s 7(3)–(5))","Cross‑references to the Assessment and Collection Act for definitions and collection powers (s 3)","Conditional special rules based on historical contribution start date (pre/post 7 May 1997) with different outcomes (s 5(4)(d)–(f))","Procedural steps and discretion for the Commissioner in TFN tracing and issuing letters which affect substantive outcomes (s 5(4)–(5))","Dependence on externally published values (index numbers, Superannuation Guarantee charge percentage) creates operational dependencies (s 6(2); s 7(3))"],"plain_english_summary":"What this law does (mechanics)\n\n- Imposes a tax charge called the \"superannuation contributions surcharge\" on members of constitutionally protected superannuation funds in respect of their surchargeable contributions for a financial year (s 4).  The Assessment and Collection Act named in s 3 sets out defined terms and the collection machinery.\n- Sets out how to calculate the percentage rate of that surcharge for affected members, using income bands, a formula for interpolated rates between two income amounts, a maximum percentage for higher incomes, and special rules where a member has not provided a tax file number (s 5).  The 2003–04 and 2004–05 benchmark income amounts and maximum surcharge percentages are specified in s 5(1A).\n- Defines the surchargeable contributions threshold for 1996–97 as $2,000 and the rule to index that threshold in later years using a formula that relies on (a) a previously published threshold, (b) an indexation factor taken from the Assessment and Collection Act, and (c) movements in the Superannuation Guarantee charge percentage (s 6).\n- Provides indexation mechanics for specific indexable amounts (s 7): an indexation formula tied to movements in the Australian Statistician’s estimate of average weekly ordinary time earnings, rounding conventions, and a publication requirement for the Commissioner (s 7(6)).\n\nWho pays and who enforces it\n\n- The surcharge is payable by individual members of constitutionally protected superannuation funds on their surchargeable contributions (s 4).\n- The Commissioner of Taxation is the operative official in several places: determining or locating tax file numbers (s 5(4)–(5)), sending warning letters (s 5(4)(c), s 5(5)), and publishing indexed amounts (s 7(6)).  The Assessment and Collection Act provides further collection powers and definitions (s 3).\n\nKey behavioural effects and incentives\n\n- Individuals are incentivised to provide their tax file number to the Commissioner (s 5(4)–(5)).  If a member fails to quote a TFN and the Commissioner cannot obtain it after reasonable steps and written warnings, the surcharge rate can default to the maximum percentage (s 5(4)(f)).  Conversely, a historical-contribution test (contributions beginning before 7 May 1997) can produce either a nil rate or the maximum rate depending on whether the member’s surchargeable contributions exceed the surchargeable contributions threshold (s 5(4)(d)–(e)).\n- The formulaic rate-setting in s 5 (including interpolation between a lower and a higher income amount and rounding rules in s 5(2)) creates precise numeric outcomes for taxpayers whose adjusted taxable income falls between the two bands; those at or above the higher band pay the stated maximum surcharge percentage (s 5(3)).\n- Indexation rules in s 6 and s 7 link thresholds, benchmark amounts and indexable figures to published wage/earnings indices and the Superannuation Guarantee charge percentage (s 6(2), s 7(3)).  That linkage adjusts the monetary triggers over time without separate legislative intervention.\n\nCompliance burden and administrative discretion\n\n- Compliance tasks fall on members (providing TFNs; monitoring whether contributions exceed thresholds — s 5(4)–(5), s 6) and on the Commissioner (locating TFNs, sending letters, publishing indexed amounts — s 5(4)–(5), s 7(6)).\n- The Commissioner has procedural discretion in how to locate TFNs (“after taking all reasonable steps”) and in choosing an address deemed \"most appropriate\" for a follow‑up letter (s 5(4)(b),(c); s 5(5)(c)).  Those procedural steps determine whether the punitive default (maximum surcharge) applies (s 5(4)(f)).\n\nInteraction with private choices and markets\n\n- The surcharge is a tax on members’ surchargeable superannuation contributions; it reduces the net after‑tax return or retirement accumulation for affected members (s 4, s 5).  The instrument does not itself regulate employers’ contribution obligations, but the surcharge potentially affects individual decisions about contribution levels, timing or salary packaging because it changes the after‑surcharge cost of making contributions (s 4–6).\n- The law differentiates treatment based on the timing of when contributions commenced (before 7 May 1997 or later) for TFN non‑quotation cases (s 5(4)(d)–(f)), producing different outcomes for members in the same fund depending on historical facts about their contributions.\n\nCosts, trade‑offs and implementation risks (mechanisms, not judgments)\n\n- Administrative costs arise from: determining adjusted taxable income for each member to feed the formula in s 5; checking whether contributions began before 7 May 1997; applying indexation formulas in s 6–7; and the Commissioner’s steps to locate TFNs and issue letters (s 5, s 6, s 7).\n- The calculation rules use multiple numeric adjustments and rounding rules (s 5(2); s 7(2)–(4)), which create small discontinuities next to thresholds and can require precise numeric handling by administrators and payers.\n- The scheme relies on external data (Australian Statistician index numbers and a Superannuation Guarantee charge percentage) to operate (s 6(2); s 7(3)), so delays, revisions or changes in those published series affect the indexed thresholds and thus the tax base (s 7(5)).\n\nStated purpose claim and testing against costs/incentives\n\n- The text in s 4 states that the Act ‘‘imposes’’ the surcharge that is payable under the Assessment and Collection Act; that is the declared mechanical purpose.  The law implements that purpose by specifying rates, thresholds and indexation rules (ss 5–7).\n- Testing that mechanical purpose against costs and incentives: the collection design shifts compliance tasks to both individuals (providing TFNs, tracking surchargeable contributions) and the Commissioner (TFN location and publication duties).  The numeric and indexation rules standardise adjustments over time, but produce administrative work to apply formulas precisely and to maintain published indexed amounts (ss 5–7).\n\nNotable special provisions\n\n- The surcharge is not payable for financial years beginning on or after 1 July 2005 (note to s 4).\n- Members who have not supplied a TFN face a default to the maximum surcharge percentage except where special historical-contribution rules produce a nil rate if contributions began before 7 May 1997 and the member’s surchargeable contributions do not exceed the threshold (s 5(4)(d)–(f)).\n\nPrimary sections to consult for mechanics: s 4 (imposition), s 5 (rates and TFN rules), s 6 (contribution threshold and its indexation inputs), s 7 (indexation mechanics and publication)."}},"importantCases":[],"_links":{"self":"/api/acts/superannuation-contributions-tax-members-of-constitutionally-protected-superannuation-funds-impositi","history":"/api/acts/superannuation-contributions-tax-members-of-constitutionally-protected-superannuation-funds-impositi/history","analysis":"/api/acts/superannuation-contributions-tax-members-of-constitutionally-protected-superannuation-funds-impositi/analysis","conflicts":"/api/acts/superannuation-contributions-tax-members-of-constitutionally-protected-superannuation-funds-impositi/conflicts","importantCases":"/api/acts/superannuation-contributions-tax-members-of-constitutionally-protected-superannuation-funds-impositi/important-cases","documents":"/api/acts/superannuation-contributions-tax-members-of-constitutionally-protected-superannuation-funds-impositi/documents"}}