Australian tax refund basics
How to Estimate Your Australian Tax Refund for 2025–26
A refund is not a bonus paid by the ATO. It is generally the difference between amounts already credited to you—especially PAYG withholding—and the final tax and other included liabilities calculated from your return.
12 min read · Educational guidance
The refund formula in plain English
Your tax return brings the year together. Assessable income can include salary and wages, business income, bank interest, government payments, rent and investment income. Allowable deductions reduce taxable income; they do not reduce tax dollar for dollar.
The return then applies the relevant income-tax rates and tax offsets. Medicare levy, study-loan repayments and other adjustments may be added. PAYG tax withheld during the year and eligible credits are then compared with that result.
- ✓ Income minus allowable deductions equals taxable income
- ✓ Tax rates and offsets determine income tax
- ✓ Medicare and study-loan amounts may be added
- ✓ Withholding and refundable credits reduce the filing balance
Example: if final included liabilities are $18,900 and PAYG withholding is $21,400, the simple estimated refund is $2,500. If only $17,000 was withheld, the estimate is $1,900 owing.
Related guide: PAYG withholding vs final tax →
Numbers to collect before estimating
Use year-to-date figures only for a planning estimate. For a lodged return, wait until income statements are marked tax ready and collect records for other income and deductions. Entering gross salary but net bank interest, or mixing monthly and annual amounts, will distort the result.
- ✓ Gross salary and wages
- ✓ Net sole-trader or business income
- ✓ Interest, rent and other taxable income
- ✓ PAYG tax withheld—not super contributions
- ✓ Work, donation and other eligible deductions
- ✓ Whether HELP and Medicare rules apply to you
Related guide: Work-related deductions →
Use the ToolsFA calculator step by step
Choose the 2025–26 rate category that matches the scenario you are testing. Enter gross salary and wages before tax, net business income after business expenses, and other taxable income in their separate fields. Then enter PAYG withholding and instalments in Tax already withheld—not take-home pay, super contributions or an expected refund.
Enter supported work expenses, gifts and other deductions once in their matching fields. Select HELP only when you are modelling an outstanding study or training loan, and use the Medicare exemption switch only for a full exemption. Calculate, then read taxable income, income tax after LITO, Medicare levy, HELP repayment and total liability before relying on the headline balance.
- ✓ Use annual figures from one income year
- ✓ Keep income, withholding and deductions separate
- ✓ Add multiple jobs within the matching categories
- ✓ Check each liability line before the refund or amount owing
- ✓ Rerun one changed assumption at a time
Example: The calculator estimates 2025–26 resident, foreign-resident or working-holiday-maker income tax from the selected rate schedule. It also models LITO where applicable, the ordinary Medicare levy and an optional simplified HELP repayment. It does not lodge a return or calculate every offset, private-health adjustment, capital gain, foreign-income rule, family Medicare threshold or part-year residency treatment.
Related guide: Medicare levy explained →
Worked example: a refund can become an amount owing
Assume an Australian resident enters $90,000 of salary, $1,200 of other taxable income, $22,000 of PAYG withholding, $1,800 of work expenses, a $250 deductible gift and $450 of other deductions. Assume no business income, no Medicare exemption and no omitted income or credits.
Total income is $91,200 and deductions are $2,500, leaving estimated taxable income of $88,700. Under the calculator's 2025–26 resident settings, estimated income tax is $17,398 and ordinary Medicare levy is $1,774. With HELP switched off, total included liability is $19,172, so the planning result is a $2,828 refund.
Example: If the same person has an outstanding HELP debt and selects HELP, the calculator adds an estimated $3,255 compulsory repayment. Total included liability becomes $22,427 and the result changes to $427 owing. The example changes only one assumption; it does not prove whether HELP applies or reproduce repayment-income adjustments the quick tool does not collect.
Why a large deduction is not the same as a large refund
A deduction reduces taxable income. Its tax effect depends on the rate applying to the relevant portion of income. A $1,000 deduction does not normally produce a $1,000 refund.
Records and the connection between the expense and earning income matter. Private portions must generally be excluded, and an expense reimbursed by an employer cannot also be claimed by the employee.
Example: If a $1,000 deduction reduces income taxed at 30%, the income-tax effect may be about $300 before considering other interactions. The actual return can differ because of offsets, Medicare and thresholds.
Why the ATO payment may differ from the estimate
A quick calculator cannot see ATO pre-fill information, data-matching changes or your account balance. It also does not know about debts that may be offset against a refund, including eligible debts with other Australian Government agencies. Private-health adjustments, credits and return items outside the collected fields can also change the assessment.
Wait for income statements to be marked tax ready before lodging, check pre-filled amounts against your records, and read the notice of assessment for the ATO's tax calculation. If the notice and the amount actually payable or refunded differ, check the statement of account for transfers, credits and other account transactions.
- ✓ Calculator result: a planning estimate from the fields entered
- ✓ Notice of assessment: the ATO's assessment calculation
- ✓ Statement of account: credits, debits and transfers on the tax account
Use an estimate responsibly
A quick calculator is useful for planning, comparing scenarios and spotting missing withholding. It is not a substitute for myTax or advice on complex matters such as capital gains, rental schedules, private health adjustments, foreign income, trusts or residency changes.
Use the ToolsFA calculator to understand the moving parts, then confirm the final result with the ATO or a registered tax agent.
Frequently asked questions
Does a tax refund mean I paid too much tax?+
Often it means withholding and credits exceeded the final included liability, but offsets and other return items can also affect the result.
Can I estimate before my income statement is tax ready?+
Yes for planning, using accurate year-to-date figures. For lodging, wait until the statement is tax ready and check pre-fill information against your records.
What should I enter as tax already withheld?+
Enter the annual PAYG withholding and PAYG instalments credited for the same income year. Do not enter net pay, super contributions, a deduction or the refund you hope to receive.
Does the estimate include government debt offsets?+
No. The calculator compares entered withholding with its included tax liabilities. The ATO may transfer some or all of an assessed refund to eligible tax or other government debts.
Why is my notice of assessment different?+
The ATO uses the complete lodged return and information available to it. Compare the assessment details with your inputs, then check the statement of account if the assessed outcome and cash payment differ.
Is a tax calculator the same as lodging a return?+
No. A calculator provides an estimate from limited inputs; lodging a return requires complete information and declarations.
Official sources and important note
This guide provides general educational information, not personal tax advice. Confirm current rules with the ATO or a registered tax agent before lodging.