Why is your tax refund lower than you expected? Usually for one of six reasons: the Stage 3 tax cuts mean less tax was over-withheld during the year; a HECS-HELP compulsory repayment kicked in; the Medicare levy applied; the ATO offset your refund against a debt; a deduction was adjusted; or the tax-free threshold was claimed from two jobs. None of these means the ATO has made a mistake – but each one shows on your Notice of Assessment, and some can be fixed for next year.
This guide works through each cause with 2025-26 figures, explains what a refund actually is, and sets out what you can do before 30 June 2027 to end up in a better position. Thresholds checked against the ATO on 6 October 2026.
The short version: a smaller refund almost always means your withholding was closer to your real tax, not that you paid more. The detail is in which of the six causes applies to you.
Key takeaways
- A refund is over-withheld tax coming back. A smaller refund usually means your pay was taxed more accurately, not that you paid more tax.
- Stage 3 cuts are in your pay, not your refund. Since 1 July 2024 less is withheld each pay, so there is less to return in July.
- HECS-HELP starts at $67,000 in 2025-26 under the new marginal system – 15c in the dollar above that. A pay rise or second job can trigger a repayment nothing was withheld for.
- The ATO offsets refunds against debts first – ATO, Centrelink, Child Support. It shows on the Notice of Assessment.
- Deductions need records. Working from home is 70c an hour with an actual hours record; estimates are rejected and the claim is cut.
Six reasons refunds are lower at a glance
| Cause | What happened | Can you change it next year? |
|---|---|---|
| Stage 3 tax cuts | Less withheld each pay since 1 July 2024, so less over-withholding to refund | No – and you are better off: the saving arrived during the year |
| HECS-HELP repayment | Compulsory repayment on income over $67,000 (2025-26), often not withheld after a pay rise or second job | Yes – tell every employer you have a study loan so they withhold for it |
| Medicare levy | 2% of taxable income once you pass $28,011 (singles) | Only via exemption or reduction if eligible |
| Debt offset | Refund applied to ATO, Centrelink or Child Support debts | Pay or arrange the debt before tax time |
| Deductions adjusted | Claims without records (WFH hours, car logbook, receipts) reduced by the ATO | Yes – keep the records the ATO specifies |
| Tax-free threshold claimed twice | Both employers under-withheld; shortfall taken from refund or billed | Yes – new TFN declaration at the second job |
What is a tax refund, really?
During the year your employer withholds tax from each pay as an estimate of your annual liability. At tax time the ATO works out the actual tax on your total income, subtracts offsets, adds the Medicare levy and any study loan repayment, and compares the result with what was withheld. If too much was withheld you get the difference back; if too little, you get a bill. A refund is not a reward and a bill is not a penalty – both are just the correction.
That is why two people on the same salary can get very different refunds. The one whose withholding matched their liability closely gets little back; the one with a second job, a study loan or an unexpected deduction sees a bigger swing either way.
How did the Stage 3 tax cuts change refunds?
From 1 July 2024 the rates became 16% ($18,201 to $45,000), 30% ($45,001 to $135,000), 37% ($135,001 to $190,000) and 45% above. Employers’ withholding tables changed at the same time, so the tax cut has arrived in every pay since then rather than as a lump sum. If you were used to a $2,000-plus refund before 2024 partly because the old tables over-withheld, that cushion is gone – but your take-home pay is higher every fortnight. The next step is already legislated: the 16% rate falls to 15% from 1 July 2026 and 14% from 1 July 2027, again delivered through pay. Our guide to ATO tax rates for 2025-26 and 2026-27 has the tables.
The Low and Middle Income Tax Offset, which added up to $1,500 to refunds, ended on 30 June 2022 and has not returned. People comparing this year’s refund to a 2021 or 2022 refund are often comparing against LMITO.
Did a HECS-HELP repayment take your refund?
This is the big one in 2026. From 1 July 2025 compulsory study loan repayments are calculated on a marginal basis: nothing on repayment income up to $67,000; 15c for each dollar from $67,001 to $125,000; $8,700 plus 17c for each dollar from $125,001 to $179,285; and 10% of total repayment income above that. For 2026-27 the first threshold rises to $69,528.
Employers only withhold for a study loan if you told them you have one on your TFN declaration, and they withhold based on that job’s pay alone. A pay rise, overtime, a bonus or a second job can push your total repayment income over $67,000 while withholding stayed at zero – and the whole repayment then comes out of your refund. On $75,000 that is $1,200. Separately, the 20% reduction to all HELP debts that existed on 1 June 2025 has been applied and does not affect your compulsory repayment for the year. See the ATO’s study loan repayment thresholds; our HECS/HELP resources explain the system.
Where the money went: read the Notice of Assessment
Your Notice of Assessment lists tax on taxable income, offsets, Medicare levy, study loan repayment, credits for tax withheld, and any amount applied to another debt. Compare it line by line with your myTax estimate – the estimate omits the levy, the loan repayment and offsets against debts, which is why the two almost never match.
Did the Medicare levy or a debt offset reduce it?
The Medicare levy is 2% of taxable income and is added at assessment. Singles pay none at $28,011 or below for 2025-26 and the full levy from $35,013. Students and part-timers who crossed the threshold for the first time often see it as a “missing” $600 to $1,000. Higher earners without private hospital cover may also pay the separate Medicare levy surcharge.
Separately, the ATO is required to apply your refund to any debt you owe it or another Australian Government agency before paying you – an old tax debt, a Centrelink overpayment, Child Support, even an unpaid Family Tax Benefit reconciliation. The offset is itemised on the Notice of Assessment. If you do not recognise the debt, contact the agency named rather than the ATO. While this is happening your return sits at “Balancing account” – our guide to the ATO balancing account stage explains the status.
Did the ATO adjust your deductions?
The ATO data-matches every return and adjusts claims that do not meet the record-keeping rules. The ones it adjusts most:
- Working from home. The fixed rate is 70 cents per work hour for 2024-25 and 2025-26, and it requires a record of your actual hours for the whole year – a timesheet, roster or diary. The ATO says an estimate is not acceptable. The rate covers internet, phone, electricity and gas, stationery and consumables, so claiming those separately as well is double-dipping. Our guide to WFH claims covers the records.
- Car expenses. Cents-per-kilometre claims capped at 5,000 km with a reasonable basis; above that you need a 12-week logbook.
- Clothing and laundry. Only occupation-specific, protective or registered uniforms; conventional clothing is never deductible.
- Self-education and tools. Deductible only where connected to your current job.
- Income left out. Pre-fill now includes bank interest, dividends, sharing-economy and crypto data. Leaving it out does not avoid tax – the ATO adds it back and the refund shrinks.
Did two jobs or a wrong TFN declaration cause it?
If you claimed the tax-free threshold from two employers, both treated your first $18,200 as tax-free and about $5,000 of tax was never withheld. The shortfall comes out of your refund first, and the rest is a bill. Fix it by lodging a new TFN declaration with your second employer answering “No” to the threshold question. Our guides to tax on a second job and the two-jobs tax-free threshold mistake explain it in detail. The same applies to anyone who did not quote a TFN and had 47% withheld – that goes the other way and produces an unusually large refund.
Rule of thumb
A refund near zero means your withholding was accurate – the best outcome, because the ATO held none of your money interest-free. Aim for that, and judge your tax year by the total tax line on the Notice of Assessment, not by the refund.
How do you do better next year?
- Tell every employer about your study loan on the TFN declaration; ask for extra withholding after a pay rise.
- Claim the tax-free threshold from one job only.
- Keep a working-from-home hours record from 1 July, plus receipts for the running costs.
- Check pre-fill against your own records before lodging; add income the ATO already knows about rather than letting it adjust you.
- Consider a deductible personal super contribution before 30 June if you are on 30% or above – it reduces taxable income and the tax withheld already then exceeds the liability.
- Clear or arrange government debts before tax time so your refund is not swallowed.
FAQ about lower tax refunds
Why is my tax refund so low this year?
The common causes in 2026 are: your employer withheld less during the year because the Stage 3 tax cuts are built into pay (so less to refund), a HECS-HELP compulsory repayment on income over $67,000, the Medicare levy, a debt the ATO offset against your refund, a deduction the ATO adjusted, or the tax-free threshold claimed from two jobs. Your Notice of Assessment itemises each one.
Did the tax cuts make my refund smaller?
Often, yes – and that is not a loss. The Stage 3 cuts (from 1 July 2024) lowered the tax withheld from each pay, so you received the saving during the year rather than as a lump sum in July. Your total tax for the year is lower; the refund is smaller because less was over-withheld.
Why did my refund go to a debt I did not know about?
The ATO is required to apply your refund to debts you owe it or other Australian Government agencies – older tax debts, Centrelink overpayments, Child Support – before paying you the balance. The offset appears on your Notice of Assessment. Call the agency named if you do not recognise the debt.
Why is my refund smaller than my estimate?
The estimate shown in myTax before you lodge does not include HECS-HELP compulsory repayments, the Medicare levy, debt offsets or corrections the ATO makes from pre-fill data such as a bank interest amount you left out. The Notice of Assessment is the real figure.
Can I get a bigger refund next year?
Only by paying less tax legitimately: keep records so you can claim every deduction you are entitled to (70c an hour working from home needs an hours record, not an estimate), make deductible super contributions before 30 June, and make sure both employers are withholding correctly. Having more withheld during the year makes the refund bigger but costs you nothing less in tax.
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If your Notice of Assessment does not add up, or you want someone to check withholding, study loan and deductions before next tax time, Nanak Accountants can review it with you. Contact us today, call 1300 626 258 or book your free 15 minute consultation.
This article is general information only and is not personal financial or tax advice. Tax rates, HECS-HELP thresholds, Medicare levy thresholds and the working-from-home fixed rate were checked against ATO sources on 6 October 2026.
