It happens. Life throws a curveball, the tax deadline flies by, and suddenly you’re facing a late lodgement penalty notice from the ATO. But what if it wasn’t just a case of forgetting? What if something genuinely outside your control stopped you from filing on time?

This is where the concept of a ‘reasonable excuse’ comes in. It’s the Australian Taxation Office (ATO) acknowledging that serious, unforeseen events can derail even the most organised person. A reasonable excuse can be the key to getting a failure to lodge penalty reduced or cancelled entirely.

The key is proving that the event directly prevented you from meeting your tax obligations, and acting quickly once you are able to.

How to Handle a Late Tax Return

• Lodge First: Always lodge your overdue tax return or BAS as soon as possible, before requesting a penalty remission.
• Know What Qualifies: A reasonable excuse is an event beyond your control, like a serious illness, natural disaster, or the death of a close family member.
• Gather Proof: Your claim is only as good as your evidence. Collect dated documents like medical certificates, insurance claims, or police reports.
• Request Remission: Formally ask the ATO to cancel the penalty by submitting a written request with your evidence through your tax agent or myGov.
• Act Responsibly: The ATO considers your compliance history and how quickly you acted to fix the situation once your crisis passed.
• Avoid Common Pitfalls: Being “too busy,” forgetting the deadline, or lacking funds to pay the tax are not considered reasonable excuses by the ATO.

What is a Reasonable Excuse for a Late Tax Return?

A reasonable excuse for a late tax return is a situation or event, genuinely beyond your control, that made it impossible for you to lodge on time. It’s not a loophole for being disorganised; it’s a provision under Australian tax law that allows the ATO to apply fairness and discretion when unforeseen circumstances disrupt your ability to meet your obligations.

When assessing your claim, the ATO looks at the complete picture, weighing up a few key factors:

• Your Circumstances: What actually happened? Was the event genuinely outside your control?
• Timing: When did the event happen in relation to your tax deadline?
• Your Efforts: What steps did you take to comply once the situation was resolved?
• Your Compliance History: Do you have a good track record of lodging and paying on time?

Essentially, the ATO wants to see that you had every intention to lodge on time but were prevented from doing so by a serious and unavoidable event. Understanding the potential financial impact of a late tax return penalty makes it clear why presenting a valid excuse correctly is so important. Check current ATO guidance for the latest rules.

Common Examples of Reasonable Excuses the ATO Accepts

While the ATO assesses every case on its own merits, certain scenarios are consistently recognised as valid reasons for late lodgement, provided you have the evidence to back them up.

These are typically serious, unexpected events that would prevent any reasonable person in the same situation from meeting their tax deadlines.

Here are some of the most common ATO reasonable excuse examples:

• Serious Illness or Accident: A sudden, severe medical condition affecting you or a close family member you are caring for (such as a spouse or child). This is not a common cold; it must be incapacitating to the point where managing financial affairs is impossible.
• Death of a Family Member: The bereavement and associated responsibilities following the death of a close family member or loved one are acknowledged as a valid reason for delay.
• Natural Disaster: If your home, business, or records were directly impacted by a declared natural disaster like a bushfire, flood, or cyclone, this is a clear-cut reasonable excuse.
• ATO System Issues: If you attempted to lodge before the deadline but were prevented by a documented ATO portal outage or system failure, this is generally accepted.
• Records Lost or Destroyed: If your essential tax documents were destroyed in a house fire, stolen during a break-in, or lost in a flood – events completely out of your control, you have a strong case for a delay.

Even with a valid reason, you may still need to formally request a tax return extension in Australia to get your affairs in order properly.

What is NOT Considered a Reasonable Excuse?

Just as important as knowing what works is understanding what the ATO will almost certainly reject. The underlying principle is that the excuse must relate to your inability to lodge, not your unwillingness to pay or simple forgetfulness.

The following are generally not considered a reasonable excuse for late lodgement:

• Being too busy or forgetting the deadline.
• Not having enough money to pay the tax liability. Lodgement and payment are separate obligations.
• Relying on a tax agent who was not provided with the necessary information.
• Misunderstanding the law or not knowing the due date.
• Simply misplacing your paperwork or not keeping good records.

Accepted vs. Rejected Excuses: A Principle-Based View

This table contrasts the principles behind excuses the ATO is likely to accept versus those it typically rejects.

Principle of Excuse	Generally Accepted Examples	Generally Rejected Examples
Beyond Your Control	A sudden, incapacitating illness; a declared natural disaster destroying your records; death of a spouse.	Forgetting the deadline; being busy at work; having staff on leave.
Directly Prevented Lodgement	Hospitalisation preventing access to your computer or documents; postal delays caused by widespread floods.	Misunderstanding tax law; errors made by your tax agent; simply misplacing paperwork you could have found.
Responsible Action Taken	Lodging as soon as the crisis passed; contacting the ATO promptly to explain the delay and seek help.	Waiting months after the event to lodge; ignoring ATO reminder notices and correspondence.

Ultimately, the ATO is looking for evidence that you acted reasonably and responsibly given the circumstances.

The Evidence the ATO Expects for Your Claim

Simply stating you have a reasonable excuse is not enough. The onus is on you to provide clear, credible evidence that proves a direct link between the event and your failure to lodge on time. A vague explanation without supporting documentation is the fastest route to rejection.

Your evidence should build a clear, logical timeline of events.

The specific documents required will depend on your situation, but here are some examples of evidence for a reasonable excuse the ATO expects:

• For Serious Illness: A dated letter or medical certificate from your doctor outlining the nature of the illness, the dates you were incapacitated, and how it prevented you from managing your affairs.
• For Natural Disaster: Official government declarations for your area, insurance claim documents, police reports, or dated photos of property damage.
• For Bereavement: A copy of a death certificate or a funeral notice.
• For Lost/Stolen Records: A police report detailing a break-in or a fire report from emergency services.
• For ATO System Issues: Screenshots showing the error message and the time you attempted to lodge.

In cases where original documents were destroyed, a statutory declaration – a formal written statement declared to be true before an authorised witness can be used to explain the circumstances. Using a detailed tax return checklist can help ensure you have organised all necessary information before you approach the ATO.

How a Reasonable Excuse Affects Penalties

When you fail to lodge a tax return, BAS, or other statement by the due date, the ATO can apply a Failure to Lodge (FTL) penalty. This penalty is calculated in units, with the amount increasing the longer the document is overdue.

Having a reasonable excuse is the primary basis for requesting a penalty remission. Remission is an exercise of ATO discretion to reduce or cancel the penalty in full.

If your reasonable excuse is accepted, the ATO will typically remit the penalty to nil. This does not cancel any tax you owe, but it removes the additional financial punishment for lodging late. Your good compliance history can also support your case for remission. The ATO is more likely to grant leniency to someone who usually lodges on time.

The ATO’s willingness to exercise discretion is a core part of the tax system’s fairness. Data from government sources like taxation revenue statistics on the ABS website show that while penalties are a key compliance tool, remission processes are actively used to support taxpayers facing genuine hardship.

How to Claim a Reasonable Excuse with the ATO

Once you’ve confirmed you have a valid reason and gathered your evidence, you need to present your case to the ATO correctly. Following a clear process significantly increases your chances of a successful outcome.

Here is a step-by-step guide to requesting a penalty remission based on a reasonable excuse:

1. Lodge the Overdue Document Immediately: This is the most critical first step. Before asking for leniency, you must lodge the outstanding tax return or BAS. This demonstrates to the ATO that you are now taking your obligations seriously. A remission request for a still-unlodged document will almost always be denied.
2. Gather and Organise Your Evidence: Collate all your supporting documents. Ensure every piece of evidence is dated and clearly corresponds to the period of the delay.
3. Draft a Clear, Factual Written Request: Write a concise letter or statement. State the facts plainly, avoiding overly emotional language. Your request should clearly explain:
   • What the event was.
   • The dates it occurred.
   • How it directly prevented you from lodging on time.
4. Submit Your Request for Remission: You can make your request in several ways:
   • Through Your Tax Agent: This is often the most effective method, as they can use a dedicated portal and frame the request in line with ATO expectations.
   • Online Services: Individuals can submit a request via myGov. Businesses can use Online services for business.
   • In Writing: You can mail your written request and copies of your evidence directly to the ATO. Check the ATO website for the current postal address.

The financial incentive for getting this right is significant. For other taxes, a reasonable excuse can also lead to penalty and interest waivers. You can learn more about the impact of reasonable excuses on business tax obligations from Revenue NSW to see how this principle is applied elsewhere.

Worked Example: How a Late Tax Return Penalty Was Waived

Let’s look at a practical case to see how this works.

• Taxpayer: David, a sole trader plumber.
• Issue: His income tax return was lodged four months late. The ATO issued a Failure to Lodge penalty.
• Reasonable Excuse: Two weeks before the lodgement deadline, David’s workshop was severely damaged in a flash flood. His computer, paper records, and tools were destroyed. The following weeks were spent dealing with insurance assessors, cleaning up, and trying to get his business operational again.
• Action & Evidence: As soon as he could, David contacted his accountant. He provided photos of the flood damage, a copy of his insurance claim, and a statutory declaration detailing the loss of his financial records. His accountant lodged the tax return using bank statements and other reconstructed data.
• Outcome: The accountant submitted a penalty remission request along with the evidence. The ATO accepted that the natural disaster and its aftermath constituted a reasonable excuse and fully remitted the penalty. David’s proactive approach and strong evidence were key to this success.

Common Mistakes That Cause Rejection

Even with a valid reason, simple mistakes in how you present your case can lead to the ATO rejecting your request.

• Mistake: Vague Claims and No Proof.
  • Quick Fix: Be specific. Instead of “I was sick,” provide a medical certificate covering the specific dates you were incapacitated and unable to manage your affairs. Always attach dated, third-party evidence.
• Mistake: Delaying Lodgement After the Crisis Ends.
  • Quick Fix: Lodge the overdue document the moment your circumstances allow. This is a non-negotiable sign of good faith. The longer you wait, the weaker your excuse becomes.
• Mistake: Confusing Inability to Pay with Inability to Lodge.
  • Quick Fix: Never state that you didn’t lodge because you couldn’t afford the tax bill. Lodgement is a separate duty. Lodge on time and, if needed, contact the ATO to discuss a payment plan.
• Mistake: Blaming Your Tax Agent Unfairly.
  • Quick Fix: The responsibility for lodgement is ultimately yours. If your agent made an error, you need to show you provided them with all information in a timely manner. If they were incapacitated, their own reasonable excuse may apply.

Reasonable Excuse Checklist

Before you or your tax agent contact the ATO, use this checklist to ensure your claim is as strong as possible.

•  Lodge First: Have you lodged the overdue tax return or BAS?
•  Identify Excuse: Is your reason an event beyond your control (e.g., illness, disaster, death)?
•  Gather Primary Evidence: Do you have dated, third-party documents (e.g., medical certificate, police report, death certificate)?
•  Establish Timeline: Does your evidence clearly show the event occurred at a time that impacted your ability to lodge by the deadline?
•  Explain the Link: Have you written a clear, factual statement explaining how the event prevented you from lodging?
•  Check Compliance History: Is your past lodgement record generally good?
•  Act Promptly: Are you making this request as soon as possible after the event resolved?
•  Prepare for Submission: Have you decided on the best way to submit your request (e.g., via your tax agent, online)?

Frequently Asked Questions

What is a reasonable excuse for a late tax return?

A reasonable excuse for a late tax return is an event or circumstance beyond your control that prevented you from lodging on time, such as serious illness, natural disaster, or ATO system issues. The ATO considers the facts, timing, and evidence provided when deciding whether to reduce or cancel late lodgement penalties. (Check current ATO guidance.)

What happens if I have a reasonable excuse but still lodge late?

If you have a reasonable excuse, you should lodge the overdue return as soon as you are able and then submit a request to the ATO for the penalty to be remitted (cancelled). You must provide evidence to support your claim.

How long do I have to request a penalty remission?

There is no strict deadline, but you should request a remission as soon as possible after you have lodged the overdue document. The longer you wait, the less compelling your case becomes.

Does a late tax return affect my credit score in Australia?

Lodging a personal tax return late does not directly impact your credit score. However, if this results in a tax debt that remains unpaid, the ATO can report this debt to credit reporting bureaus, which can negatively affect your score.

Can my tax agent get me out of a penalty automatically?

No. While using a tax agent provides a later due date, it does not grant automatic immunity from penalties if that deadline is missed. However, an experienced agent is invaluable in preparing a strong reasonable excuse penalty remission request that meets ATO expectations.

What if the ATO rejects my reasonable excuse?

If your initial request for remission is denied, you have the right to formally object to the decision. Objections typically must be lodged within 60 days of receiving the decision and require a more detailed legal argument. Seeking professional advice is highly recommended if you choose to object.

Will the ATO accept a reasonable excuse for a late BAS?

Yes. The principles for a late BAS reasonable excuse are the same as for an income tax return. The ATO will consider circumstances like serious illness, natural disaster, or other events beyond your control when deciding whether to remit a Failure to Lodge penalty for a Business Activity Statement.

What is the ATO failure to lodge penalty amount?

The Failure to Lodge (FTL) penalty is calculated in “penalty units” and depends on the size of the entity and how overdue the lodgement is. For a small entity, the penalty can be one unit for every 28-day period (or part thereof) that the document is late, capped at five penalty units. The value of a penalty unit is updated periodically, so always check current ATO guidance for the latest figures.

Late with your tax return and unsure if your excuse will be accepted? Book a consult with Nanak Accountants & Associates or call 1300 NANAK TAX (626 258)