{"id":"F2018L00661","name":"Family Law (Superannuation) (Interest Rate for Adjustment Period) Determination 2018","slug":"family-law-superannuation-interest-rate-for-adjustment-period-determination-2018","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":439636,"registerId":"F2018L00661-fast-fetch-1775955587238","compilationNumber":null,"startDate":"2026-04-12","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Family Law (Superannuation) (Interest Rate for Adjustment Period) Determination 2018","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n    ![Commonwealth Coat of Arms](image.001.png)\n\n \n\n \n\nFamily Law (Superannuation) (Interest Rate for Adjustment Period) Determination 2018\n\nI, Guy Francis Thorburn, Australian Government Actuary, make the following determination under regulation 45D of the Family Law (Superannuation) Regulations 2001.\n\nDated:  17 May 2018\n\n![H:\\AGA\\General Administration\\Signatures\\GTSignature.jpg](image.002.jpeg)\n\nGuy Francis Thorburn\n\nAustralian Government Actuary\n\n \n\n \n\n   \n\nContents\n\n1 Name of determination\n\n2 Commencement\n\n3 Authority\n\n4 Definition\n\n5 Adjustment period—financial year\n\n6 Adjustment period—less than 12 months within financial year\n\n7 Adjustment period—12 months not within financial year\n\n8 Adjustment period—less than 12 months not within financial year\n\n \n\n1  Name of determination\n\n  This determination is the Family Law (Superannuation) (Interest Rate for Adjustment Period) Determination 2018.\n\n2  Commencement\n\n  This determination commences on 1 July 2018.\n\n3  Authority\n\n  This determination is made under regulation 45D of the Family Law (Superannuation) Regulations 2001.\n\n4  Definition\n\n  In this determination:\n\nregulations means the Family Law (Superannuation) Regulations 2001.\n\n5  Adjustment period—financial year\n\n  For subregulation 45D(3) of the regulations, the interest rate for the adjustment period, being the financial year beginning on 1 July 2018, is 0.049.\n\n6  Adjustment period—less than 12 months within financial year\n\n (1) This section applies to an adjustment period of less than 12 months that begins and ends in the financial year beginning on 1 July 2018.\n\n (2) For subregulation 45D(4) of the regulations, the method for working out the interest rate for the adjustment period is by using the formula:\n\n![](image.003.png)\n\nwhere:\n\nd is the number of days in the adjustment period.\n\n7  Adjustment period—12 months not within financial year\n\n (1) This section applies to an adjustment period of 12 months that begins in the financial year beginning on 1 July 2017 and ends in the financial year beginning on 1 July 2018.\n\n (2) For subregulation 45D(6) of the regulations, the method for working out the interest rate for the adjustment period is by using the formula:\n\n![](image.004.png)\n\n  \n\n  where:\n\nd1 is the number of days in the adjustment period in the financial year beginning on 1 July 2017.\n\nd2 is the number of days in the adjustment period in the financial year beginning on 1 July 2018.\n\n8  Adjustment period—less than 12 months not within financial year\n\n (1) This section applies to an adjustment period of less than 12 months that begins in the financial year beginning on 1 July 2017 and ends in the financial year beginning on 1 July 2018.\n\n (2) For subregulation 45D(6) of the regulations, the method for working out the interest rate for the adjustment period is by using the formula:\n\n![](image.005.png)\n\n  where:\n\nd1 is the number of days in the adjustment period in the financial year beginning on 1 July 2017.\n\nd2 is the number of days in the adjustment period in the financial year beginning on 1 July 2018.\n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an annual technical determination that performs exactly the function intended by regulation 45D of the Family Law (Superannuation) Regulations 2001—setting the interest rate for adjustment periods. It has not expanded beyond its original purpose."},"complexity_factors":["Short, focused instrument (8 sections, ~2 pages)","Single defined term ('regulations')","Four straightforward scenarios with simple mathematical formulas","Heavy reliance on external context (Family Law (Superannuation) Regulations 2001) without reproducing that context","Formulas involve basic arithmetic (weighted averages based on days) but require understanding of the underlying regulatory framework"],"plain_english_summary":"This instrument sets the interest rate at 4.9% for calculating growth or decline in superannuation during the adjustment period when court-ordered splits are implemented in the 2018–19 financial year. It affects separating couples, super funds, and family lawyers by standardising how delayed transfers are adjusted.\n\nBy fixing the rate and providing for pro‑rata treatment across different periods, it helps ensure fair allocations despite administrative or timing delays."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument does not change the legal scope of the Family Law (Superannuation) Regulations. It simply specifies the numeric interest rate for the 2018–19 adjustment period and provides methods to prorate that rate for partial or cross-year adjustment periods, operating under the authority of regulation 45D (ss 3, 5–8)."},"complexity_factors":["Numeric specification of a single annual interest rate (straightforward) (s 5).","Prorating rules require day-count calculations for partial-year adjustment periods (parameter 'd') (s 6).","Cross-year adjustment periods require weighted averaging using days in each financial year (parameters 'd1' and 'd2') (ss 7–8).","Dependence on regulation 45D of the Family Law (Superannuation) Regulations 2001 as the operative authority (s 3 and s 4 definition).","Precision and rounding risks in applying exponential/weighting formulas (ss 6–8), creating small calculation/implementation burdens for practitioners.","Low interpretive discretion in substance (fixed rate and formulas) but requires accurate administrative application by actuaries, tribunals, solicitors and trustees."],"plain_english_summary":"This determination fixes the interest rate (0.049, i.e. 4.9%) to be used under regulation 45D for superannuation adjustment periods beginning 1 July 2018, and provides the formulas to prorate that rate for partial-year or cross-year adjustment periods. It affects separating couples, super funds, actuaries and courts who calculate payment adjustments: parties pay or receive the resulting interest. The Australian Government Actuary sets the rate; users must apply the day-count formulas in sections 6–8 to work out pro rata amounts."}},"importantCases":[],"_links":{"self":"/api/acts/family-law-superannuation-interest-rate-for-adjustment-period-determination-2018","history":"/api/acts/family-law-superannuation-interest-rate-for-adjustment-period-determination-2018/history","analysis":"/api/acts/family-law-superannuation-interest-rate-for-adjustment-period-determination-2018/analysis","conflicts":"/api/acts/family-law-superannuation-interest-rate-for-adjustment-period-determination-2018/conflicts","importantCases":"/api/acts/family-law-superannuation-interest-rate-for-adjustment-period-determination-2018/important-cases","documents":"/api/acts/family-law-superannuation-interest-rate-for-adjustment-period-determination-2018/documents"}}