ATO late lodgement penalty: up to $364 per 28 days, capped at $1,820 per document · interest 11.43% p.a. compounding daily · See how to remit them →
The rule: obligations never expire, and neither do refunds
Unlodged returns stay owing forever. The ATO's records show every outstanding year until a return or a non-lodgment advice closes it. The mirror image is the good news: a refund sitting in a 2013 return is still fully claimable today, because the ATO holds unclaimed refunds indefinitely.
What lodging very old years involves
| Years back | How it is lodged | Data availability |
|---|---|---|
| Last 2 to 4 years | myTax supports a limited set of recent prior years; agents lodge all of them | Full ATO pre-fill: employers, banks, dividends, health funds |
| 5 to 10 years | Registered tax agent (electronic) or paper forms | Pre-fill substantially available; agents can pull your ATO held income data |
| 10 to 20 years or more | Agent or paper, using ATO income records plus your own reconstruction | Patchier. ATO income records still exist, but deductions rely on bank records and reasonable estimates |
The practical ceiling is not legal, it is evidence. Income is rarely the problem because employers reported it to the ATO all along. Deductions from very old years are where records thin out, and a reasonable, defensible reconstruction beats claiming nothing. See lodging without receipts.
Old returns and old penalties
- Refund or nil years: generally no penalty, however old the year is.
- Tax owing years: failure to lodge penalty capped at $1,820 each, plus general interest charge backdated to the original due date. On very old debts the interest dwarfs the penalty, which is the strongest argument for lodging those years now.
- Everything is remittable: a decade-late voluntary catch-up is exactly the fact pattern remission requests are built for.
The order of operations for a long backlog
Oldest first, always. Losses, offsets and HELP balances carry forward, and lodging out of order creates reassessment churn. The full sequence, from auditing what is outstanding to remission, is in the overdue tax returns guide, and the multi-year version is in I haven't lodged in years.
Rates and ATO guidance checked August 2026.
Frequently asked questions
How many years back can I lodge a tax return?
Will I still get refunds from tax returns lodged years late?
Can I lodge old tax returns myself online?
What if I have no records from those years?
Is there a penalty for lodging a 10-year-old return?
General information only - not personal tax, financial or legal advice. Consider your own circumstances or speak to a registered tax agent. Remission of penalties or interest and payment plans are decisions of the ATO and outcomes can't be guaranteed.