The AMIT regime: how ETF and managed fund distributions are taxed for retirees, and why cost base tracking matters

For Australian retirees holding ETFs and managed funds — typical components of most retirement portfolios — the Attribution Managed Investment Trust (AMIT) regime under Division 276 of ITAA 1997 (https://classic.austlii.edu.au/au/legis/cth/consol_act/itaa1997240/s276.1.html, accessed 7 May 2026) is the framework that determines how distributions are taxed and how the underlying cost base is tracked. The regime, in operation since 1 July 2016 under the Tax and Superannuation Laws Amendment (New Tax System for Managed Investment Trusts) Act 2016, replaced the older present-entitlement taxation for qualifying managed investment trusts that elect AMIT status (ATO — Attribution managed investment trusts, https://www.ato.gov.au/individuals-and-families/investments-and-assets/managed-investments-and-other-trusts/attribution-managed-investment-trusts, accessed 7 May 2026). Most large Australian ETFs (Vanguard, iShares, BetaShares, VanEck, and others) and many large managed funds (Magellan, Platinum, etc.) have elected AMIT status, so for the typical retiree portfolio the AMIT mechanics are the practical reality. The regime introduces two key operational features that distinguish it from the older treatment: attribution rather than present entitlement (the trust attributes amounts to members based on a documented method, which becomes the taxable basis), and cost base adjustments (where the attributed amount differs from the distributed amount, the investor's cost base in their units is adjusted up or down accordingly under ITAA 1997 s.104-107B). For retirees with long-held ETF positions, the cumulative cost base adjustments over the holding period can differ materially from the original purchase price, and proper tracking is essential for accurate CGT calculation on eventual disposal.

The basic mechanism of AMIT taxation is straightforward at the investor level. The trustee documents an attribution method allocating the trust's components — Australian-source interest, dividends with franking credits, foreign income with foreign income tax offset entitlement, net capital gains with discount and indexation labels, other amounts — to members based on the method (typically reflecting members' unit holdings during the year). At year-end, each member receives an AMIT Member Annual (AMMA) Statement detailing the attributed amounts, the actual cash distributions received during the year (cash distributions or DRP units), the cost base adjustments arising from any difference between attribution and distribution, and the various tax credits attached. The investor includes the attributed amounts in their tax return — not the distributed amounts — and applies the franking credits, FITO, and other attached credits as appropriate (ATO — managed funds tax return instructions, https://www.ato.gov.au/individuals-and-families/your-tax-return/instructions-to-complete-your-tax-return/individual-tax-return-instructions/2025/managed-funds, accessed 7 May 2026). The cost base of their units is updated based on the AMMA's cost base adjustment column.

The distinction between attribution and distribution is the conceptual feature that often confuses investors. Distribution is what the investor actually receives during the year — cash deposited to their account, or DRP units allocated under a dividend reinvestment plan. Attribution is what the investor is taxed on — the components allocated to them by the AMIT trustee, which may include amounts not yet distributed (capital gains realised within the trust but not yet paid out, for example). The two figures are typically close but can differ. Where attribution exceeds distribution, the investor's cost base is increased by the under-distributed amount under s.104-107B. Where distribution exceeds attribution, the investor's cost base is decreased. The cost base adjustments ensure that amounts taxed via attribution aren't double-taxed on later disposal (the increased cost base reduces the future capital gain), and amounts distributed but not attributed are recognised at the eventual CGT event (the decreased cost base produces a larger eventual capital gain, capturing the deferred amount).

A worked example illustrates the practical effect. A retiree holds 1,000 units in a broad-market ETF acquired three years ago at $50 per unit (cost base $50,000). During the current year, the ETF distributes $1,000 in cash to the investor (10c per unit). At year-end, the AMMA statement shows: attributed amount $1,200 (12c per unit, with the extra 2c reflecting capital gains realised within the trust during the year but not distributed), distributed amount $1,000, under-distribution $200, cost base adjustment +$200. The investor includes $1,200 in their assessable income (along with any franking credits or FITO from the AMMA), and the cost base of their units increases from $50,000 to $50,200 (or $50.20 per unit). When the investor eventually sells the units — perhaps at $55 per unit after several more years — the capital gain calculation uses the adjusted cost base (accumulated over multiple years of AMMA adjustments), not the original purchase price. The under-distribution from the current year doesn't reappear separately at sale because it was already taxed via attribution and the cost base adjustment recognised it in the unit cost.

The practical implication for retirees is that AMIT cost base tracking is required across the entire holding period, with each year's AMMA contributing adjustments. For a retiree who holds a Vanguard ETF for 15 years, the cumulative cost base adjustments across all 15 AMMAs determine the cost base at sale (MoneySmart — exchange-traded funds, https://moneysmart.gov.au/investing-in-shares/exchange-traded-funds-etfs, accessed 7 May 2026). Without proper tracking, the eventual CGT calculation defaults to the original purchase price as cost base — typically over-stating the capital gain (because positive cost base adjustments accumulate in most years) and over-paying tax. For investors with multiple AMIT holdings, the tracking work multiplies, and manual record-keeping in a spreadsheet accumulates errors over time. Investment platforms like Sharesight (and the integrated record-keeping in some online brokers) automate the AMMA capture and cost base adjustment, providing reliable cost base figures at any point. For substantial AMIT portfolios — typical for retirees with $500,000+ in ETFs and managed funds — platform-based tracking is generally preferred over manual approaches.

The AMMA statement contents typically include several components that flow into the investor's tax return: attributed amounts by character (Australian-source interest, unfranked dividends, franked dividends, foreign income, net capital gains with discount and indexation flags, other components); distribution amounts received during the year; cost base net adjustment under s.104-107B (positive or negative); franking credits attached to attributed dividends; foreign tax offsets attached to attributed foreign income; and TFN amounts withheld where applicable. The integrated AMMA statement provides everything needed for the investor's tax return, replacing the older annual tax statement format that pre-AMIT trusts continue to use.

The interaction with super for AMIT holdings inside super funds operates at the fund level rather than the member level. In pension phase, fund earnings (including AMIT attribution) are tax-exempt — the AMMA reports the data for fund accounting purposes but no member-level tax flows from the AMIT. In accumulation phase (15% earnings tax), the AMMA contributes to the fund's tax position, and the member sees this indirectly through fund returns and member statements. For SMSFs holding AMITs, the AMMA flows into the fund's annual return preparation by the SMSF accountant; for industry/retail funds, the trustee handles the integration internally. Members typically don't see the AMMA directly for super holdings — they see the fund's net return after fund-level tax.

The non-AMIT trust residual is worth noting. Some smaller managed funds and trusts have not elected AMIT status and continue under the older present-entitlement regime in Division 6 of the ITAA 1936. For these holdings, the investor receives an annual tax statement (rather than an AMMA), is taxed on present-entitlement amounts at year-end, and doesn't have the trust-level cost base adjustment mechanism. The CGT calculation on disposal uses the standard cost base (purchase price plus brokerage and other capital costs, less specific tax-deferred distributions if any). For retiree portfolios with a mix of AMIT and non-AMIT holdings, the tax preparation handles each separately. The AMIT regime applies to most large ETF and major managed fund holdings; it doesn't apply to direct shares (which are taxed on dividends as received and CGT on disposal under the normal rules), to property holdings, or to specific niche or boutique funds that haven't elected AMIT.

For the practical advice work with retiree clients holding ETFs and managed funds, the AMIT framework determines the year-end tax preparation and the eventual disposal CGT outcome. Identify which holdings are AMIT (most ETFs are). Collect AMMA statements at year-end. Track cost base adjustments cumulatively (preferably via a platform). Include attributed amounts (not distributed amounts) in the tax return. Apply the relevant credits. Calculate CGT on disposal using the adjusted cost base. The work is straightforward when the systems are in place; the errors that arise from inadequate tracking accumulate quietly over years and surface unhelpfully at the disposal event when the records aren't there to support the proper calculation.

What do worked planning examples show?

These two cases show how the AMIT regime plays out for typical retiree investment scenarios. Illustrative only — not personal advice — using FY25-26 figures.

Case 1 — Patricia, 70, holds $400,000 in three Vanguard ETFs, all AMIT, acquired progressively over the past 8 years. She manages her own tax records via a spreadsheet but hasn't been capturing the cost base adjustments from her AMMA statements — she's been treating the original purchase prices as cost base. On these facts, the rational pathway is to reconstruct the cost base position by collecting all 8 years of AMMAs from each ETF (Vanguard's investor portal typically has historical AMMAs available), summing the cost base adjustments per holding under s.104-107B, and updating Patricia's records. Going forward, she should use a tracking platform (Sharesight or similar at a few hundred dollars a year) for automated capture. The trap to avoid is selling holdings without reconstructing the cost base — if Patricia sold a Vanguard ETF this year using original purchase price as cost base, she would over-state the capital gain by potentially several thousand dollars, over-paying tax. The reconstruction is one-off work that captures years of adjustments and sets up clean tracking going forward.

Case 2 — David, 67, sold $200,000 of Magellan Global Fund last year, calculating capital gain using original purchase price as cost base. Magellan elected AMIT status at the regime's commencement, and David has held the units for 12 years. His original purchase price was $100,000, sale proceeds $200,000, capital gain on his calculation $100,000 (with 50% CGT discount applied, $50,000 included in income). On these facts, the rational pathway is to reassess the capital gain calculation by collecting all 12 years of AMMAs from Magellan and applying the cumulative cost base adjustments under s.104-107B. If the cumulative adjustments increased the cost base by $30,000 over the 12 years (a typical figure for a Magellan-style fund with periodic capital gains attribution), the actual capital gain would be $70,000 (reduced by the cost base adjustment), with $35,000 included in income after CGT discount. David has over-paid tax on the original calculation. An amendment to the relevant year's tax return can recover the over-payment within the standard ATO amendment period (generally two years for individuals with simple affairs, four years for more complex returns), with the proper cost base documented for the file. The trap to avoid is treating the original purchase price as cost base for any AMIT holding — the AMMA-driven adjustments are real and material, and the CGT calculation must use them.

For Australian retirees holding ETFs and managed funds, the AMIT regime is the dominant framework that determines year-end tax outcomes and eventual CGT calculations on disposal. The mechanics — attribution rather than present entitlement, AMMA statements, cost base adjustments under s.104-107B — are technical but the practical implications for retirees are clear: track cost base adjustments year-by-year, use the adjusted cost base for any CGT calculation on disposal, and prefer platform-based tracking for substantial portfolios. The advice work is to ensure clients understand the regime, have systems in place for accurate tracking, and apply the rules properly at disposal events. For portfolios that have been quietly accumulating un-tracked cost base adjustments over years, the reconstruction work is one-off but valuable — and for portfolios going forward, the discipline produces accurate tax outcomes that compound across the retirement years.

Sources

• classic.austlii.edu.au — S276.1
• classic.austlii.edu.au — S104.107b
• Australian Taxation Office (ATO) — Attribution managed investment trusts
• Australian Taxation Office (ATO) — Managed funds
• MoneySmart (ASIC) — Exchange traded funds etfs