Tax Offset (Rebate)
A direct reduction in the amount of tax you owe, different from a deduction which reduces taxable income.
A tax offset (formerly called a rebate) directly reduces your tax payable, dollar for dollar. This is different from a deduction, which reduces your taxable income — the value of a deduction depends on your marginal tax rate, while a tax offset reduces your tax bill by its full face value. For example, a $1,000 tax offset saves you $1,000 in tax, regardless of your marginal rate.
Common tax offsets include the Low Income Tax Offset (LITO, up to $700), the Senior Australians and Pensioners Tax Offset (SAPTO, up to $2,230 for singles), the Private Health Insurance Rebate (if claimed as a tax offset rather than a premium reduction), and the franking credit offset for Australian dividends. Some offsets are refundable (you get cash back if the offset exceeds your tax), while most are non-refundable (they can only reduce your tax to zero).
Franking credits are the main example of a refundable tax offset — if your franking credits exceed your tax liability, the excess is refunded to you. Most other individual offsets are non-refundable, meaning they can't create a refund on their own but can reduce your tax to zero.
How it works
A tax offset reduces the tax you owe directly, dollar for dollar, rather than reducing your taxable income the way a deduction does. A $1,000 deduction is only worth your marginal rate times $1,000, but a $1,000 offset cuts $1,000 straight off your tax bill regardless of what rate you're on — which is why offsets and deductions, though often confused, behave quite differently in practice.
You encounter offsets automatically at assessment time rather than by claiming them separately in most cases — the ATO calculates entitlements like the Low Income Tax Offset or the Senior Australians and Pensioners Tax Offset for you based on the income and circumstances reported in your return, and applies them before finalising your tax payable. Franking credits attached to Australian share dividends are also delivered as a tax offset once you report the dividend income.
The key distinction most people miss is between refundable and non-refundable offsets. Most individual offsets, including LITO and SAPTO, are non-refundable — they can reduce your tax to zero but can't push you into a refund beyond that on their own. Franking credits are the standout exception: if your franking credits exceed your entire tax liability, the excess is paid to you as cash, which is why franking credits behave differently in retirement income planning than almost any other offset.
Example: a non-refundable offset hitting its limit
Suppose your tax payable before any offsets is $500, and you're entitled to the full $700 Low Income Tax Offset based on your income for the year. Because LITO is non-refundable, it can only bring your tax bill down to zero — it reduces the $500 liability to $0, using $500 of the $700 available offset.
The remaining $200 of LITO entitlement is not paid out or carried forward; it simply disappears, because non-refundable offsets can't generate a cash refund beyond wiping out the tax you actually owed. If you'd also had $300 in franking credits attached to some dividend income that same year, those would still be refunded in full, since franking credits are refundable and aren't limited to just reducing your tax to zero.
Related Terms
Low Income Tax Offset (LITO)
A non-refundable tax offset of up to $700 for individuals with taxable income below $66,667.
Senior Australians and Pensioners Tax Offset (SAPTO)
A tax offset of up to $2,230 (single) for eligible seniors and pensioners, effectively raising the tax-free income level.
Income Tax
Tax levied by the federal government on your taxable income, calculated using progressive tax brackets.
Franking Credits (Imputation Credits)
Tax credits attached to dividends representing company tax already paid on the profits, preventing double taxation.
Private Health Insurance Rebate
A government rebate that reduces the cost of private health insurance premiums, means-tested based on income and age.