How to Lodge Old Tax Returns: ATO Steps, Penalties, and Refunds

You can still lodge old tax returns in Australia no matter how many years overdue they are, and the fastest, cheapest route is to come forward voluntarily before the ATO contacts you. Returns from the 2016 income year onward can generally be lodged online through myTax; anything from 2013 or earlier has to go in on paper using that year’s form; and a registered tax agent can handle any year on your behalf. Voluntary lodgment before the ATO opens an examination can cut penalties by up to 80%, and by 100% where the shortfall is under $1,000.1Australian Taxation Office. Liability and Penalties for Voluntary Corrections

First, Check Whether You Had to Lodge That Year

Not every year on your list will actually require a return. If you were an Australian resident, your only income was from a job, and your total taxable income for the full year was below the tax-free threshold of $18,200, you likely had no lodgment obligation for that year.

You do need to lodge, even on low income, if any of the following applied:

  • PAYG tax was withheld from your wages (you lodge either to confirm what you owe or to claim a refund).
  • You received certain Centrelink or other Australian Government payments.
  • You ran a business during the income year, regardless of the amount earned.
  • You had reportable fringe benefits, reportable employer super contributions, or a private health insurance rebate to reconcile.
  • You made or claimed a tax loss and need to preserve it.

Work through each overdue year separately, because thresholds and your circumstances can differ year to year.

What Late Lodgment Will Cost You

The ATO charges a failure-to-lodge-on-time penalty of one penalty unit for every 28 days (or part) a return is overdue, capped at five penalty units.2Australian Taxation Office. Failure to Lodge on Time Penalty As of November 2024 a penalty unit is $330, so the maximum FTL penalty for an individual is $1,650 per overdue return.3Australian Taxation Office. Penalty Units Across several missing years that adds up quickly.

Any unpaid tax also attracts the General Interest Charge, which compounds daily. For the first half of 2026 the GIC annual rate is 10.65% for January to March and 10.96% for April to June.4Australian Taxation Office. General Interest Charge (GIC) Rates The GIC keeps running until the debt is cleared, even while you’re on a payment plan.

Default Assessments Are Worse

Leave overdue returns long enough and the ATO can estimate your income using third-party data and issue a default assessment. Those estimates make no favourable assumptions about your deductions, and the resulting tax liability carries a 75% penalty on top.5Australian Taxation Office. If You Don’t Lodge The ATO will warn you first and give you a chance to lodge properly; ignoring that warning leaves you stuck with their numbers.

Why Voluntary Lodgment Cuts the Bill

Coming forward before the ATO announces an examination is the single biggest lever for reducing penalties. A voluntary disclosure before an examination can reduce shortfall penalties by 80%, and where the shortfall is less than $1,000 the penalty can be reduced to nil.1Australian Taxation Office. Liability and Penalties for Voluntary Corrections Even after the ATO has notified you of an examination, a disclosure that saves them significant time or resources can still earn a 20% reduction. Lodge before they come looking.

Records You Need for Each Year

Each income year has its own return form with its own labels, thresholds, and calculations, so you must use the correct year’s version. The ATO hosts prior-year individual return forms and schedules on its website, and publications from 1984 to 2012 are available through its Publications Ordering Service.6Australian Taxation Office. Prior Year Tax Return Forms and Schedules Download the form and the matching year’s instructions together.

For each overdue year, gather:

  • Income records: PAYG payment summaries or income statements from employers, bank interest statements, dividend statements, government payment summaries, and any other assessable income.
  • Deduction records tied to that specific year: work-related expenses, self-education, donations, and other claims.
  • Private health insurance details and the annual tax statement from your insurer, which drives the Medicare levy surcharge calculation and the rebate reconciliation.
  • Records of any personal super contributions you want to claim as a deduction.

Filling the Gaps in Old Records

The ATO already holds a lot of your data. Pre-filling reports drawn from information supplied by employers, banks, government agencies, and other third parties are available from the 2009 income year onward, though older years have some gaps.7Australian Taxation Office. Pre-filling 2009-11 A registered tax agent can pull these reports through the ATO’s agent services.8Australian Taxation Office. About Pre-filling When you lodge through myTax, pre-fill data loads automatically for the years available online.

Banks can provide historical statements going back many years, often for a retrieval fee on older records. If a former employer has closed or you can’t reach them, pre-fill data will usually contain the income they reported for you. Where no records exist at all, talk to the ATO or a tax agent before guessing; reasonable estimates supported by documented working can sometimes be accepted.

How to Lodge Each Year

Your options depend on how far back the return goes.

myTax for 2016 Onward

Returns from the 2016 income year onward can be lodged through myTax. Sign in to your myGov account, select ATO from your linked services, and choose “Manage tax returns.”9Australian Taxation Office. Lodge Your Tax Return Online with myTax Returns for 2014 and 2015 may also be available online if you meet the eligibility requirements.10Australian Taxation Office. Lodge a Prior Year Tax Return Pre-fill data loading automatically reduces the chance of missing income the ATO already knows about.

Paper for 2013 and Earlier

For 2013 and earlier income years, online lodgment isn’t available and you’ll need to lodge on paper.10Australian Taxation Office. Lodge a Prior Year Tax Return Download the correct year’s form from the ATO archive, complete it, and post it to the ATO at the GPO Box 9845 address for your capital city.11Australian Taxation Office. Write to Us Send it by registered post so you have proof of lodgment.

Registered Tax Agent

A registered tax agent can lodge prior-year returns for you and often has electronic lodgment channels for years you can’t access through myTax. An agent is especially useful with multiple overdue years, complex income, or patchy records, because they can pull your ATO pre-fill data, work through penalty issues with the ATO, and sequence your lodgments. Lodging the oldest year first stops further penalty units accruing on it.

After You Lodge

The ATO processes the return and issues a Notice of Assessment showing the tax, any credits, and whether you owe money or are due a refund. Returns lodged online through myTax or an agent are typically processed within two weeks, while paper returns can take up to 50 business days.12Australian Taxation Office. Your Notice of Assessment Prior-year returns can take longer in practice, especially if the ATO needs to verify information.

If the ATO asks for more information, respond quickly. Delays can push the ATO to finalise the assessment on incomplete information, or in extreme cases issue a default assessment with the 75% penalty.

Refunds on Old Returns

Australia does not impose a hard statutory cut-off after which refunds from overdue returns are forfeited. If you were owed a refund for a year you never lodged, lodging now can still get it to you. If you owe money for other years, the ATO will offset your refund against those debts before paying anything out.

Fixing Mistakes Later

If you spot an error after lodging, you generally have two years from the day after your Notice of Assessment is issued to request an amendment.13Australian Taxation Office. Time Limits on Tax Return Amendments Getting the return right the first time is worth the extra care, because amending a late return adds another layer of processing.

Paying a Debt Across Multiple Years

Lodging several overdue years at once can produce a combined tax bill that’s hard to clear immediately. The ATO offers payment plans that break the debt into weekly, fortnightly, or monthly instalments over a fixed period.14Australian Taxation Office. Payment Plans The GIC keeps accruing on the outstanding balance while you’re on a plan, so paying down faster costs less overall.

A few practical points on plans:

  • Income tax debts and activity statement debts need separate payment plans.
  • Any refunds you become entitled to are automatically applied against your debt, but that does not replace your scheduled instalment.
  • Missing payments, or failing to lodge new returns on time while on a plan, can cause the ATO to cancel the arrangement and demand the full balance.

If you genuinely can’t pay, contact the ATO to discuss hardship provisions. Ignoring the debt doesn’t make it go away: the GIC keeps compounding, and the ATO can garnish wages, freeze bank accounts, and place liens on assets.