Some Australians pay more tax than they legally need to — not through any wrongdoing, but because they claim fewer deductions than they are entitled to, miss tax offsets that apply to them, or have too much withheld from their wages. Here is how to identify whether you might be in this situation and what to do about it.
Why You Might Be Paying Too Much Tax
1. You are not claiming all your deductions
Work-related deductions are one of the most common areas of under-claiming. Many Australians do not claim:
- Work-from-home expenses — the 67c/hour fixed rate is straightforward to claim if you have a diary
- Phone and internet — the work-related proportion, calculated from a 4-week representative sample
- Self-education expenses — courses that maintain or improve skills for your current role
- Union fees and professional memberships
- Tools and equipment under $300 (immediately deductible)
- Income protection insurance premiums (held outside super)
See the Tax Deductions Australia guide for the full list.
2. You have HECS debt but your employer is not withholding enough
If you have HECS-HELP debt but have not notified your employer, the correct HECS repayment withholding may not be applied. This leads to a HECS bill at tax time, but also means you had more in hand during the year than you technically owed. Conversely, if you’ve paid off your HECS but your employer is still withholding for it, you are over-withholding.
Check your HECS balance via myGov and review your TFN declaration with your employer if needed.
3. You are not claiming the tax-free threshold
If you are an Australian resident with one employer and you have not told them to apply the tax-free threshold to your withholding, they withhold at a higher rate. Update your TFN declaration with your employer — this is a simple form available from the ATO.
4. You are missing offsets
Some offsets are claimed automatically through your return; others require action:
- LITO — claimed automatically by myTax if you are eligible
- Private health insurance rebate — you must declare your insurance details; if you did not claim it through your insurer (to reduce premiums), you claim the rebate in your return
- Zone tax offset — you must claim it — it does not apply automatically
5. You have not lodged previous returns
If you have not lodged tax returns for prior years and you were owed refunds, you have effectively lost the benefit of those refunds. The ATO allows refunds on returns lodged up to two years after the normal lodgement date (and sometimes longer). Older returns may still be worth lodging.
How to Check if Your Withholding Is Correct
Your employer withholds tax based on your TFN declaration and your pay each cycle. You can use the ATO’s tax withheld calculator (ato.gov.au) to estimate how much should be withheld from your pay. If the actual withholding differs significantly from the calculator amount, check your TFN declaration settings.
The Most Common Missed Deductions
Research by the ATO consistently shows that Australian employees most commonly miss:
| Missed deduction | Action |
|---|---|
| Work-from-home | Start keeping a diary of WFH hours |
| Phone (work use) | Identify work use % from a 4-week sample |
| Union/professional memberships | Keep the annual renewal notice |
| Vehicle (between work sites) | Keep a logbook or record trips |
| Self-education | Keep invoices/receipts for all courses |
| Charitable donations | Keep donation receipts; check DGR status |
What If You Are Paying Too Little Tax?
If you have significant income from investments, rental properties, or self-employment that is not subject to PAYG withholding, you may be under-paying tax during the year. The ATO will enter you into the PAYG instalment system after your first high-income year. In the meantime, set aside 25–35% of business and investment income for your tax liability.
Frequently Asked Questions
How do I know if I will get a tax refund? You will get a refund if the total tax withheld (from your employer and other withholding) exceeds your actual tax liability for the year, after deductions and offsets are applied. Lodge your return to find out.
Can I apply to have less tax withheld from my pay? Yes. If you have significant deductions (like investment property losses), you can apply to the ATO for a PAYG withholding variation, which reduces your withholding to better reflect your expected tax outcome. This gives you more money each pay cycle rather than a large refund at the end.
Should I try to maximise my tax refund? A large refund means you over-paid tax during the year — you have given the ATO an interest-free loan. Ideally, your withholding should match your actual liability. But under-paying can result in interest charges, so it is generally safer to be slightly over-withheld.
Will the ATO tell me if I am owed a refund I haven’t claimed? In some cases, the ATO sends a notice if it has data suggesting you should have lodged. But it is your responsibility to lodge, not the ATO’s to track down over-payment. Unclaimed refunds from un-lodged returns are not automatically paid out.
This article provides general tax information. For advice tailored to your situation, speak with a registered tax agent or accountant. Find one through the Tax Practitioners Board register.