ATO Late Lodgement Penalty: Costs and How to Avoid It

/ Individual Taxation / By

missed a tax deadline here’s how to dodge massive ato penalties

Updated for the 2026–27 financial year

If you have lodged a tax return or business activity statement late, the Australian Taxation Office can apply a Failure to Lodge penalty. For an individual or small business, this penalty starts at $364 for being one day late and rises in steps to a maximum of $1,820, adding another $364 for each 28 day period the return is overdue (for documents that fell due before 1 July 2026 the penalty unit was $330, so the steps ran from $330 to $1,650). The good news is that the ATO does not apply this penalty in every case, and there are several practical ways to reduce or remove it, even after you have missed the deadline.

This article explains what the penalty is, how it is calculated, what it costs at each stage, and the steps you can take right now to minimise or avoid it.

Table of Contents

What Is a Failure to Lodge Penalty?

When you have an obligation to lodge or report a document by a particular date and you do not lodge by that due date, the ATO may charge you a Failure to Lodge on time penalty. This is the formal name for what most people simply call a late lodgement penalty.

The penalty is designed to encourage everyone to lodge on time. It is not applied automatically in every case. For a first time delay, especially where the lateness is out of character, the ATO will often choose not to issue a penalty at all. You can read the full guidance on the ATO Failure to Lodge on time page.

It is also important to understand early on that lodging late and paying late are two separate matters with two separate consequences. We explain the difference in detail further down.

Is It Illegal to Not Lodge a Tax Return?

This is one of the first questions anxious readers ask, so let us address it directly. Lodging your return is a legal obligation, and there is a difference between the everyday civil penalty most people face and the criminal exposure that applies only in serious cases.

For the vast majority of people who simply fell behind, the consequence is an administrative Failure to Lodge penalty. Honest delays are handled this way, not through the courts.

At the extreme end, persistent or deliberate non-compliance can be prosecuted under the Criminal Code Act 1995 (Cth) and the Taxation Administration Act 1953 (Cth). Failure to lodge tax returns can result in fines of up to $13,750, with potential imprisonment for repeated or deliberate non-compliance. In the most severe cases involving systematic deception, intentional tax fraud can result in up to 10 years imprisonment. The key element in all of these is intent. Criminal exposure is reserved for deliberate conduct, not honest mistakes or one off delays.

Who Can Receive a Failure to Lodge Penalty?

Failure to Lodge penalties can apply to a wide range of taxpayers, including:

  • Individuals
  • Companies
  • Trusts
  • Superannuation funds
  • Partnerships

The penalty does not just apply to income tax returns. The ATO can apply it to a range of late lodged documents, including:

  • Income tax returns
  • Activity statements, such as your BAS
  • Fringe benefits tax (FBT) returns
  • PAYG withholding annual reports
  • Single Touch Payroll reports
  • Annual GST returns and information reports
  • Taxable payment annual reports
  • Combined Global and Domestic Minimum Tax Returns
  • Global Information Returns

Whether you are an individual who forgot to lodge a personal return or a business that missed a BAS, the penalty regime applies broadly.

Key Deadlines: When Does Late Actually Mean Late?

For most individuals lodging their own return, the cut off is 31 October. For the 2025-26 return that date falls on a Saturday, so lodging by Monday 2 November 2026 is on time. If you earned more than the tax free threshold of $18,200 in the financial year, you generally must lodge a return.

There is an important option if you use a registered tax agent. To qualify for the extended tax return due date of 15 May 2027 under the ATO Registered Agent Lodgment Program, you must be officially registered as a client of a registered tax agent on or before 31 October 2026. Being on the agent’s client list by that date can push your due date out without triggering a late lodgement penalty.

There is one crucial catch. Taxpayers with any prior year tax returns outstanding as at 30 June 2026 are not eligible for the extension to 15 May 2027. If you have overdue prior year returns, you must lodge your 2026 return by 31 October 2026, regardless of when you engage a tax agent. If you bring all your outstanding prior year returns up to date by 31 October 2026, the extended program due dates can then apply to your 2026 return. You can read more about this rule in this accountant’s warning to late lodgers.

The same rule applies to self managed superannuation funds. An SMSF with outstanding prior year returns must lodge its complete annual return by 31 October 2026.

How the ATO Calculates the Penalty

The penalty is worked out using a system of penalty units. The base penalty amount accrues at one penalty unit for every 28 days, or part of that period, that your document remains outstanding. For individuals and small entities, the penalty is capped at five penalty units, which means it stops growing once you reach the maximum number of overdue periods.

The penalty unit value is $364 for infringements on or after 1 July 2026, up from $330 for the period 7 November 2024 to 30 June 2026. For individuals and small withholders, this works out to $364 per 28 day period, up to a maximum of $1,820. In simple terms, the longer you wait, the more penalty units accrue, up to the five unit cap.

Penalty Amounts at Each Stage of Delay

The table below shows how the penalty escalates at each interval for an individual or small entity, using the $364 penalty unit that applies from 1 July 2026.

Days overdue Approximate penalty
1 to 28 days $364
29 to 56 days $728
57 to 84 days $1,092
85 to 112 days $1,456
113 days or more $1,820 (maximum)

Because the penalty grows with every 28 day period, lodging today rather than next month can mean the difference between one interval and several. Each day genuinely counts.

Penalty Unit Indexation: Why the Amount Can Change

The $364 penalty unit value is not fixed permanently. Penalty unit values are indexed by inflation on a three year indexation cycle, which means the amount can rise over time. Because of this, the dollar figures above are a guide based on the current value. Before you rely on a precise amount, check the current penalty unit value on the ATO Failure to Lodge on time page. Background on how the value is indexed is set out in this Parliamentary Budget Office document.

Higher Penalties for Medium and Large Business

The base penalty mechanic of one penalty unit per 28 day period stays the same across entity types, but the ATO applies a multiplier based on the size of the entity. The base penalty amount applies to individuals and small withholders. A small withholder is an entity that withholds at least one amount during a month and withholds less than $25,000 for the income year.

  • Medium withholders have the base penalty multiplied by two. A medium withholder withholds more than $25,000 but less than $1 million during an income year and had assessable income or GST turnover between $1 million and $20 million.
  • Large withholders have the base penalty multiplied by five. A large withholder withholds, or was a member of a wholly owned group that withholds, more than $1 million in the previous income year and had assessable income or GST turnover of $20 million or more.
  • Significant global entities have the base penalty multiplied by 500.

For everyday individuals and small businesses, the base penalty and the maximum of $1,820 are the figures that matter most.

The Refund or Nil Result Exception

Here is a point that gives many readers immediate relief. The ATO generally does not issue a Failure to Lodge penalty notice for a late lodged tax return, FBT return, annual GST return or activity statement if the lodgement results in either a refund or a nil result. In other words, if your late return would not result in any tax owing, or would actually produce a refund, the penalty is generally not charged.

There are a few exceptions to this. A penalty notice may still be issued if the penalty was applied before lodgement, if the document is a third party data report, or if you are classified as a large withholder. For most everyday taxpayers, though, a refund or nil outcome means no penalty. Before you assume the worst, it is worth working out what your return would actually show.

The ATO Warning Process Before a Penalty Is Issued

In many cases, the ATO will contact you before formally issuing a penalty, giving you a chance to lodge. The ATO will warn you by phone or in writing and issue a notice to lodge, giving you the opportunity to lodge or to engage if you are experiencing circumstances that are preventing lodgement.

This warning is a real opportunity to act, not a sign that enforcement has already started. If you act on that contact and lodge promptly, you may avoid a penalty altogether. When a penalty is formally issued, the ATO will tell you the reason for the penalty, the amount, and a due date for payment of at least 14 days after the notice. The practical message is simple. As soon as you receive any correspondence from the ATO, act on it.

Late Lodgement vs Late Payment: Two Separate Problems

This is one of the most commonly misunderstood points. The two consequences are separate:

  • A Failure to Lodge penalty applies when a document is not lodged on time.
  • The general interest charge (GIC) applies when a tax debt is not paid on time.

The GIC is a daily charge that builds on any outstanding balance every day until the debt is paid. The general interest charge rate is 11.43% for the July to September 2026 quarter and 11.51% for the October to December 2026 quarter. You can view the current and historical rates on the ATO GIC rates page. GIC incurred on or after 1 July 2025 is no longer tax deductible.

This means you can owe GIC without ever receiving a Failure to Lodge penalty, for example if you lodged on time but were late paying the resulting bill. It also means both can apply at the same time if your return is both late and unpaid. Crucially, lodging on time, even if you cannot pay straight away, stops the Failure to Lodge penalty from growing. Lodging promptly even when you are unable to pay is always better than not lodging at all.

Worked example: Imagine you lodged your return 60 days late and the return revealed a tax bill of $5,000 that you have not yet paid. Because the document was lodged late, a Failure to Lodge penalty of $728 applies, being two 28 day periods. On top of that, the unpaid $5,000 attracts the general interest charge, accruing daily until you pay. The penalty and the interest are separate amounts that stack together, which is why dealing with both quickly keeps the total cost down.

Do You Even Need to Lodge? The Non-Lodgement Advice Option

Before you worry about penalties, it is worth checking whether you need to lodge at all. The tax free threshold for 2025-26 and 2026-27 is $18,200, and income up to this amount is taxed at 0%. If your income is under the tax free threshold and no tax has been withheld from that income, you may not need to lodge a return.

However, a return is still required in several situations, including where you had tax withheld from your income and want a refund, where you received investment income from shares, rental properties, or managed funds, or where you made a capital gain. If you are unsure, confirm your obligation with a registered tax agent.

If you work out that you do not need to lodge, you can complete a non-lodgement advice to let the ATO know. This is important. Submitting a non-lodgement advice tells the ATO you are not required to lodge, which prevents the ATO from treating you as having an outstanding obligation and stops the reminders. If you submit neither a return nor a non-lodgement advice, the ATO will assume you need to lodge and may take compliance action to force you to lodge. A registered tax agent can lodge a non-lodgement advice on your behalf.

Can You Avoid the Penalty Entirely?

There are four situations where you may not have to pay a Failure to Lodge penalty, even if a document is overdue.

  1. Lodging on time. The simplest way to avoid the penalty is to lodge by the due date. If you usually lodge on time and miss a single deadline, the ATO will often exercise its discretion and choose not to issue a penalty, especially if you act quickly after a warning.
  2. Lodging a nil or refund return. As covered above, the penalty is generally not applied where the late return produces a nil result or a refund, subject to the limited exceptions.
  3. Submitting a non-lodgement advice. If you are not required to lodge, a non-lodgement advice keeps you in the clear and stops the ATO treating you as non-compliant.
  4. Engaging a registered tax agent before the deadline. Being on a registered agent’s books on or before 31 October can give you access to the extended lodgement deadline, provided your prior year returns are up to date.

Safe Harbour: Registered Tax and BAS Agents

If you use a registered tax or BAS agent, safe harbour provisions may protect you from a Failure to Lodge penalty. Safe harbour applies if you engaged a registered tax or BAS agent, you provided the agent with all relevant tax information to enable lodgement by the due date, and the agent’s failure was not due to recklessness or intentional disregard of tax law.

Note that this is more than simply having a tax agent. All three conditions must be met. The burden of proof rests with you, the taxpayer, so keep evidence such as emails, document checklists, and dates showing when you provided your information. Remember the prior year rule as well. If you have outstanding prior year returns, the extended deadline does not apply, and your 2026 return remains due by 31 October 2026.

ATO Support for Difficult Personal Circumstances

The ATO has support options for people in hardship or facing vulnerability. If illness, family difficulties, or financial stress are part of your situation, this is a softer pathway than letting a penalty build. The best step is to contact the ATO or a registered tax professional before the deadline, explain your circumstances, and ask what support is available. Raising your situation early almost always produces a better outcome than staying silent.

How to Reduce or Remove an FTL Penalty: Remission

If you have already been charged a penalty, you can ask the ATO to reduce or fully remit it. Remission means the ATO exercises its discretion to reduce or remove a penalty that has already been issued. The single most effective first step is to lodge the overdue document.

Once the document is lodged, contact the ATO to request remission and explain your circumstances. Common grounds the ATO considers include:

  • A genuine mistake where you believed you were not required to lodge a document
  • Circumstances beyond your control that prevented you from lodging, such as illness, destroyed records, or an inability to access records
  • The penalty being excessive when your conduct is taken into account

A good compliance history strengthens your case, and supporting your request with evidence makes a real difference.

How to Request Penalty Remission: Step by Step

Here is a practical sequence to follow:

  1. Lodge the overdue return as soon as possible. Lodging first demonstrates good faith and is usually a precondition to remission.
  2. Gather supporting evidence. Helpful documents may include medical certificates, employer letters, correspondence about the events affecting you, and statutory declarations setting out the circumstances.
  3. Contact the ATO. You can do this by phone or through myGov and ATO Online.
  4. State your grounds clearly. Explain plainly why the penalty should be reduced or removed and tie your reasons to the grounds above.

A registered tax agent can submit the remission request on your behalf, which is often worthwhile if your circumstances are complex or several years are involved.

What Happens If You Ignore the Penalty?

Ignoring a penalty does not make it disappear, and the consequences escalate over time. If a penalty notice is left unaddressed, you can expect ongoing Failure to Lodge penalty accrual, general interest charge building on any unpaid tax, an increased likelihood of an ATO compliance review or audit, and eventual escalation to a default assessment. Penalties for multiple overdue years can also stack together, increasing your total exposure. Engaging with the ATO early always produces a better outcome than ignoring it.

Default Assessments: When the ATO Estimates Your Tax

If penalties fail to encourage lodgement, the ATO can issue a default assessment, estimating your income and tax liability based on the data it already holds. The ATO can charge a default administrative penalty under section 284-75(3) of Schedule 1 to the Taxation Administration Act 1953. The base penalty is calculated as 75% of the underlying tax liability that the ATO has assessed or estimated. The ATO can increase the base penalty by 20% if you have had to pay another default administrative penalty, which results in a total penalty of 90% of the underlying tax liability.

Default assessments often show a higher tax liability than you would actually owe, because they do not take your deductions into account. The default administrative penalty is also in addition to the ordinary penalty for not lodging in the first place. Once an assessment has issued, the burden falls on you to prove your actual liability, which is much harder than simply lodging correctly. You can read more about how these penalties work in this overview of ATO default penalties.

Appealing a Default Assessment

You can object to the ATO’s assessment of the default administrative penalty, but you may have as little as 60 days to lodge your objection, so acting quickly matters. To challenge a default assessment, you generally need to provide evidence of your actual income and deductions and lodge the correct return.

The ATO has discretion to remit all or part of the default administrative penalty. It may remit where you made a genuine mistake and believed you were not required to lodge, where circumstances beyond your control prevented you from lodging, or where the total penalty would be excessive given your conduct. If you provided cooperation during an audit that exceeds reasonable cooperation, you may receive a remission of up to 80% of the base penalty. Because the process is technical and the deadlines are short, professional assistance is strongly recommended.

Criminal Prosecution: The Most Serious Outcome

In rare and serious cases, persistent and deliberate non-lodgement can escalate beyond penalties to criminal prosecution. As covered earlier, failure to lodge can result in fines of up to $13,750, with potential imprisonment for repeated or deliberate non-compliance, and intentional tax fraud can result in up to 10 years imprisonment in the most severe cases.

It is important to keep this in perspective. This is the extreme end and applies to deliberate conduct, not honest mistakes or one off delays. For the vast majority of everyday Australians who simply fell behind, this is not the realistic outcome, but it underlines why ongoing non-lodgement should never be ignored.

Can You Lodge an Overdue Return Yourself?

Yes. Individuals can lodge overdue tax returns themselves through myTax or by paper. The practical benefit of lodging as soon as possible is that it stops the penalty from accruing further. Lodging yourself does not automatically waive a penalty, but it demonstrates good faith and supports any remission request you make afterwards.

Reconstructing a Return When Records Are Missing

If you lack records, the ATO usually holds pre-fill data from employers, banks, and other third parties, which is available through myGov and can help you reconstruct your return. A registered tax agent can access this data on your behalf, which is particularly useful when several years are outstanding. Where records have been lost or destroyed, this may also be grounds for penalty remission, so keep a note of what happened and any evidence you can gather.

Managing the Debt: ATO Payment Plans

If a late return results in a tax bill you cannot pay immediately, you may be able to set up a payment plan with the ATO. You can set one up online through myGov or ATO Online Services, or by calling the ATO. A payment plan lets you pay the debt off over time and reduces the risk of further enforcement action. Setting one up also demonstrates good faith, which can support a remission application.

Keep in mind that the general interest charge continues to accrue on any outstanding amount while you are on a payment plan. A payment plan helps you manage cash flow, but it does not stop interest from building on the remaining balance, so paying the debt down sooner is still in your interest.

How Late Can You Lodge an Australian Tax Return?

There is no absolute statutory deadline that prevents you from lodging a very old return. In practice, late lodgement is accepted, and lodging late is always far better than not lodging at all. The longer the delay, however, the greater the penalties, the more interest accrues on any unpaid tax, and the higher the risk of a default assessment.

The ATO can and does pursue old outstanding obligations, particularly where it holds data suggesting a return should have been lodged. If you have several years outstanding, the best approach is to bring them all up to date together, often with the help of a registered tax agent who can manage multiple years and request remission across them. The key point is that delay only increases the cost, so the sooner you act, the better the outcome.

Frequently Asked Questions

What is the penalty for lodging a tax return one day late?

For an individual or small withholder, the Failure to Lodge penalty for the first 28 day period is $364, and being just one day late falls within that first period. Lodging promptly keeps you within a single interval rather than allowing further increments to accrue.

What is the maximum failure to lodge penalty for an individual?

The maximum Failure to Lodge penalty for an individual or small withholder is five penalty units, which is $1,820 for infringements from 1 July 2026. Once you reach 113 days or more overdue, the penalty stops growing at this cap.

Can I get an extension if I use a tax agent?

Yes, in most cases. If you are officially registered as a client of a registered tax agent on or before 31 October 2026, the extended lodgement program can push your 2026 due date out to 15 May 2027. The catch is that any prior year returns outstanding as at 30 June 2026 disqualify you from the extension, and those returns must be lodged by 31 October 2026.

Will I get a penalty if my return results in a refund?

Generally, no. The ATO does not usually issue a Failure to Lodge penalty notice for a late lodged return that results in a refund or a nil result. The exceptions are where the penalty was applied before lodgement, where the document is a third party data report, or where you are classified as a large withholder. Even so, it is best to lodge promptly so the ATO does not treat you as non-compliant.

What is the difference between an FTL penalty and a GIC?

The Failure to Lodge penalty applies for not lodging a document on time. The general interest charge is interest charged on unpaid tax. They are separate, which means you can face one without the other. The GIC rate is 11.43% for the July to September 2026 quarter and 11.51% for October to December 2026, and GIC incurred from 1 July 2025 is not tax deductible.

What is the $600 rule?

There is no standard ATO rule by this name. The relevant threshold for whether you have a lodgement obligation is the tax free threshold of $18,200 for 2025-26 and 2026-27, along with other triggers such as having tax withheld, earning investment income, or making a capital gain. If you are unsure whether you are required to lodge, confirm your obligation with a registered tax agent rather than relying on an unofficial rule of thumb.

Need Help With an Overdue Return or ATO Penalty?

If you are reading this, there is a good chance you have already missed the deadline, and every additional 28 day period that passes can add another increment to the penalty for an individual or small entity, up to the maximum. The single clearest message is this: the sooner you act, the better the outcome.

You now know how the penalty is calculated, what it costs at each 28 day interval, how the general interest charge can add to the cost, the difference between lodging late and paying late, and the practical steps available to reduce or remove a penalty, from lodging a non-lodgement advice to relying on safe harbour or requesting remission.

If you have one or more overdue returns, a penalty notice, or a tax debt you are unsure how to handle, the registered tax agents at Tax Window can help. We can lodge your overdue returns, request penalty remission on your behalf, set up payment plans, and represent you with the ATO so you do not have to face it alone. Because the penalty cycle resets every 28 days, the best time to act is now.

Artur Osadchiy

About The Author: Artur Osadchiy

Artur is a Certified Practising Accountant with over 30 years’ experience working as a trusted advisor to 600+ clients across Australia. Based in Melbourne, he started Tax Window with his wife Marina in 2009 and leads the firm’s tax and accounting team. In his free time, Artur enjoys watching the AFL (go Kangas!) and spending time with family.

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