Adjusted taxable income: the number that quietly decides more than you think

Most people, asked what their income is, will point to the figure at the bottom of their tax return — their taxable income. It's a reasonable answer, but for a surprising number of retirement entitlements it's the wrong number. The figure that actually decides whether you get the Commonwealth Seniors Health Card, the government co-contribution, and several other benefits is a broader one called adjusted taxable income, and it can be meaningfully higher than your taxable income. Understanding this matters, because a lot of the strategies people use to reduce their taxable income — negative gearing, salary sacrifice — often do nothing to reduce their adjusted taxable income, and people get caught out when a year that looked "low income" on the tax return still fails an income test. This article is general information only, not personal advice.

What is adjusted taxable income actually?

Adjusted taxable income — ATI for short — is your taxable income plus a set of add-backs. The idea is to give a fuller picture of your financial capacity than taxable income alone, which can be reduced by all sorts of deductions and arrangements. The amounts added back to your taxable income to reach your ATI are reportable superannuation contributions (the extra you put in through salary sacrifice, plus personal deductible contributions); total net investment losses (losses from a rental property or from financial investments — so negative gearing is added back); reportable fringe benefits (the grossed-up value of certain benefits provided through employment); target foreign income not already in your taxable income; and certain tax-free pensions or benefits, with any child support you pay subtracted (ATO, https://www.ato.gov.au/individuals-and-families/income-deductions-offsets-and-records/income-tests; Services Australia, https://www.servicesaustralia.gov.au/what-adjusted-taxable-income). Each of these add-backs exists for the same reason: to stop someone appearing "low income" for benefit purposes simply because they've reduced their taxable income through salary sacrifice, negative gearing, or salary packaging. ATI looks through those.

Where is it used, and why does it matter in retirement?

For retirees, the most important place ATI shows up is the Commonwealth Seniors Health Card (CSHC), the concession card many self-funded retirees of Age Pension age hold. The CSHC income test is based on your adjusted taxable income plus the deemed income from your account-based pensions, tested against limits of $101,105 for a single and $161,768 combined for a couple (20 September 2025) (Services Australia, https://www.servicesaustralia.gov.au/income-test-for-commonwealth-seniors-health-card). So if you're testing whether you'll qualify for that card, your taxable income alone won't tell you — you need the ATI figure plus the deemed pension income. A closely related income measure also feeds into the government co-contribution — which uses a "total income" figure built from your assessable income plus reportable fringe benefits and reportable employer super contributions (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/how-to-save-more-in-your-super/government-super-contributions/super-co-contribution) — and the same look-beyond-taxable-income idea runs through the spouse contribution tax offset, Division 293 tax on higher earners' super, the Medicare levy surcharge, and the private health insurance rebate. These tests don't all use one identical figure, but they share the same logic.

Why don't tax tricks lower this number?

Here's the part that catches people out. A negatively geared property reduces your taxable income — that's the whole point of the strategy — but the rental loss is added back when working out your ATI, so it does nothing to help you slip under the threshold for the Seniors Health Card or the co-contribution (ATO, https://www.ato.gov.au/individuals-and-families/income-deductions-offsets-and-records/income-tests). Likewise, salary sacrifice lowers your taxable income, but the reportable contributions are added back too. So "I had a low-income year," measured by your taxable income, does not necessarily mean "I had a low adjusted taxable income." Plenty of people arrange their affairs to minimise tax, then are surprised to find the same arrangements don't help them qualify for an income-tested benefit. Minimising tax and minimising assessed income for benefits are not the same goal, and ATI is where the difference shows up.

What is ATI not used for?

One important clarification: the Age Pension income test does not use adjusted taxable income. The Age Pension has its own income test, based largely on deeming your financial assets, and it works quite differently (our companion pieces on the Age Pension income test and on how capital gains are treated explain that side). So don't assume the figure that governs your Seniors Health Card is the same one that governs your Age Pension — they're separate systems with separate definitions. ATI is the measure for the tax-and-concession side of things — the Seniors Health Card, the co-contribution, the surcharge and rebate — not for the pension means test.

What do the worked examples show?

These show where ATI quietly changes the answer. They are illustrative only — not personal advice, and your circumstances determine the outcome.

Helen, 67, is a self-funded retiree who still owns a negatively geared investment property and salary-sacrifices into super from some part-time consulting. Her taxable income for the year comes out at around $85,000 after the rental loss and the sacrifice, and she assumes that comfortably clears her for the Commonwealth Seniors Health Card (single limit $101,105, 20 September 2025). On these facts the taxable-income figure is misleading: her net rental loss and her reportable super contributions are both added back to reach her ATI, which could lift it well above $85,000 — and then the deemed income from her account-based pension is added on top before the test is applied (Services Australia, https://www.servicesaustralia.gov.au/income-test-for-commonwealth-seniors-health-card; https://www.servicesaustralia.gov.au/what-adjusted-taxable-income). On these facts it is generally rational for Helen to work out her actual ATI plus deemed pension income before assuming she qualifies, because the very strategies that cut her tax don't cut the number the card is tested against.

David, 63, earns a modest income and wants to claim the government super co-contribution by making a $1,000 personal non-concessional contribution. He also salary-sacrifices a chunk of his pay and assumes his low taxable income makes him a clear candidate. On these facts the co-contribution uses a "total income" measure that adds his reportable employer super contributions back in, so his salary-sacrificed amounts count toward the income test even though they reduced his taxable income (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/how-to-save-more-in-your-super/government-super-contributions/super-co-contribution). On these facts it is generally rational for David to check his total income on the right basis — not just his taxable income — before counting on the co-contribution, since the add-back could push him past the threshold he thought he was under. The lesson in both cases is the same: for these benefits, the number that decides isn't the one at the bottom of the tax return.

Sources

• ATO — Income tests (adjusted taxable income components)
• Services Australia — What adjusted taxable income is
• Services Australia — Income test for a Commonwealth Seniors Health Card
• ATO — Super co-contribution