If the ATO has issued a default assessment against you, it means the Commissioner of Taxation has estimated your taxable income and calculated a tax liability in your absence, because you did not lodge a tax return when required [1]. For Australian expats, this is more serious than it sounds: the ATO’s estimate is almost never in your favour, penalties and general interest charges begin compounding immediately, and the debt follows you internationally. The good news is that a default assessment is not the end of the road. You have defined legal options to dispute it, replace it with a correct lodgment, or negotiate the debt, but you must act quickly [2].
TL;DR: Key Takeaways
- A default assessment is a tax liability the ATO calculates on your behalf when you have not lodged. It is almost always an overestimate.
- You can challenge it by lodging your actual non-resident tax return Australia, which replaces the ATO’s estimate with real figures.
- You have the right to object to the assessment within strict time limits. For individuals and small businesses, this is generally 2 years from the date of the notice of assessment, while other taxpayers generally have 4 years [4].
- Penalties and interest can sometimes be reduced through a voluntary disclosure or formal remission request, but outcomes are not guaranteed.
- Doing nothing is the worst option. The ATO will pursue the debt through debt recovery action, including in some cases referral to credit agencies or overseas enforcement mechanisms [6].
What Exactly Is an ATO Default Assessment?
A default assessment is a formal tax assessment the Commissioner issues when a taxpayer has failed to lodge a return and the ATO decides it can no longer wait [3]. Under the Income Tax Assessment Act 1936, the Commissioner has the power to assess a taxpayer’s income based on the best available information, which may include third-party data from employers, financial institutions, share registries, and foreign income reporting [3]. For expats, this data is often incomplete, meaning the assessment can drastically overstate your actual tax liability.
Key characteristics of a default assessment:
- It carries the same legal weight as a self-assessed return from the day it is issued.
- Penalties are typically applied on top of the assessed primary tax amount.
- General interest charges (GIC) accrue daily on the outstanding balance from the original due date.
- The ATO does not need to prove the estimate is accurate. The burden shifts to you to demonstrate the correct figure [1].
Why Are Australian Expats Particularly Vulnerable to Default Assessments?
Building on the mechanics above, the harder question for expats is why they are disproportionately exposed to this risk compared with Australian residents. The answer comes down to a combination of visibility, complexity, and assumptions.
- Residency ambiguity: Many expats assume that because they live overseas, they have no Australian tax obligations. This is frequently incorrect. If the ATO considers you an Australian tax resident under any of the four residency tests (Resides, Domicile, 183-Day, Commonwealth Superannuation), you are required to lodge.
- Australian-sourced income continues: Rental income from an Australian investment property, dividends, interest, and capital gains all create ongoing lodgment obligations regardless of where you live.
- Missed ATO correspondence: Notices are sent to Australian addresses. Expats often do not receive warning letters until the matter has escalated [5].
- Multiple overdue years: A common pattern is two to five years of unfiled returns accumulating before a default assessment arrives.
What Are Your Legal Options After Receiving a Default Assessment?
Receiving a default assessment does not mean you are locked into the ATO’s figure. You have three main pathways, and they are not mutually exclusive.
| Option | What It Involves | Best For |
|---|---|---|
| Lodge the Outstanding Return(s) | File your actual non-resident tax return Australia for the relevant year(s). The correct assessment replaces the default [1]. | Anyone whose real taxable income differs from the ATO’s estimate, which is nearly everyone. |
| Formal Objection | Lodge a written objection to the assessment with the ATO, citing grounds for why the assessment is excessive [4]. | Situations where lodging a return alone does not resolve the dispute or where penalty amounts are contested. |
| Penalty and Interest Remission Request | Apply to the ATO to reduce or waive penalties and general interest charges, citing circumstances such as being overseas without receiving notices. | Reducing the total debt after lodgment establishes the correct primary tax amount. |
In practice, the most effective strategy combines all three: lodge the correct returns to replace the default, object to any remaining excessive penalties, and separately request remission of interest where there is a reasonable basis. The ATO has a general amendment period of four years from the date of an assessment for most taxpayers, so timeliness matters.
How to Lodge Overdue Returns as an Expat: A Step-by-Step Overview
A related but distinct question is the practical process of actually lodging overdue returns from overseas, which is more involved than a standard annual filing.
- Appoint a registered tax agent immediately. A registered Australian tax agent can engage with the ATO on your behalf, access your account history, and negotiate extended lodgment dates [5]. Do not contact the ATO directly before this step.
- Gather your income records. This includes Australian rental statements, PAYG summaries, dividend and interest statements, share transaction records, and any foreign income that may be assessable in Australia.
- Determine your residency status for each year. Non-resident returns are taxed differently to resident returns. Misclassifying residency for even one year can produce an incorrect outcome and trigger further ATO scrutiny.
- Prepare and lodge returns in chronological order. The ATO generally expects the earliest overdue year to be lodged first.
- Negotiate a payment arrangement if a tax debt remains. If correct lodgment still leaves a payable amount, a registered tax agent can help negotiate an instalment arrangement with the ATO to avoid further enforcement [6].
Can Penalties and Interest Be Reduced?
Stepping back from the technical detail, a separate concern for most expats is the additional cost beyond the primary tax. Penalties for failure to lodge on time are calculated as a percentage of the tax owing, and general interest charges compound daily. These can sometimes exceed the primary tax amount for returns that are several years overdue.
Factors the ATO considers when deciding on remission include:
- Whether the taxpayer made a voluntary disclosure before the ATO initiated contact
- Whether there were genuine circumstances preventing lodgment (serious illness, natural disaster, documented lack of awareness of obligations)
- The taxpayer’s prior compliance history
- Whether full co-operation was provided once the issue was identified [2]
Remission is not guaranteed. What a registered tax agent brings is the ability to frame the request in terms that align with the ATO’s published remission guidelines, presenting your circumstances in the strongest light.
Frequently Asked Questions
How long do I have to object to a default assessment?
For individuals and small businesses, you generally have 2 years from the date of the notice of assessment to lodge a formal objection. Other taxpayers generally have 4 years from that date [4]. Acting promptly is still critical, as delays can complicate your position and limit your options.
Will lodging my actual return automatically cancel the default assessment?
Lodging the correct return replaces the ATO’s estimate with your actual figures, which typically supersedes the default assessment. However, penalties already imposed do not disappear automatically and need to be addressed separately [1].
Can the ATO pursue me for tax debt while I am living overseas?
Yes. The ATO has expanded its debt recovery activity and is actively pursuing outstanding debts, including for taxpayers based overseas [6]. Ignoring the debt does not make it go away.
I have not filed a non-resident tax return Australia for several years. Where do I start?
The first step is appointing a registered Australian tax agent who specialises in expat returns. They can access your ATO lodgment history, identify which years are outstanding, and manage the lodgment process on your behalf including any communication with the ATO [5].
What if I genuinely had no Australian taxable income for those years?
Even if your taxable income was nil, you may still have been required to lodge a return if the ATO had you on their system as a resident or as someone with Australian-sourced income. Your tax agent can lodge nil returns for the relevant years to clear the lodgment obligation and resolve the default assessment.
Is there an amnesty program for expats with overdue returns?
The ATO has run targeted lodgment programs in the past. Whether a specific program is currently available depends on the ATO’s compliance priorities at the time. A registered tax agent will know what voluntary disclosure pathways are currently open and how to position your situation most favourably.
About ODIN Tax
ODIN Tax is Australia’s specialist tax agent practice for expats and non-residents. As a Registered Australian Tax Agent, ODIN Tax has served over 10,000 Australian expats across more than 40 countries, with a 4.9/5 Google rating from 330+ verified reviews. Led by Tax Director Pau Lam, the practice specialises in the exact scenarios covered in this article: overdue lodgment resolution, default assessment responses, tax residency determination, and non-resident CGT and rental income compliance. Unlike generalist accounting firms, ODIN Tax is built exclusively around the non-resident tax landscape and understands the practical realities of managing Australian tax obligations from overseas. The ODIN Group additionally provides mortgage broking and conveyancing services, meaning tax strategy is coordinated directly with property acquisition planning from day one.
Received a default assessment or have overdue Australian tax returns?
ODIN Tax works with Australian expats across 40+ countries to resolve ATO issues efficiently, from overdue lodgments to penalty negotiations. Get specialist advice from a team that understands your situation from the ground up.
References
- What’s a Default Assessment? – Lawpath (lawpath.com.au)
- Default assessments for overdue tax returns | The Quinn Group (www.quinns.com.au)
- Assessing Tax Assessments – Tax Blog (taxcontroversypartners.com.au)
- ATO Dispute Guide: Stages and Processes of a Tax Dispute – Velocity Legal (www.velocitylegal.com.au)
- Default Tax assessment warning-Late Tax Return | Tax Focus (www.taxfocus.com.au)
- Tax debts? Expect the ATO to come knocking | CPA Australia (www.cpaaustralia.com.au)
