My tax agent lodged late — is the penalty mine or theirs?

The records went across in September. There was a reply saying it was in hand. Then nothing for six weeks, and the next thing in the letterbox is an ATO notice with a penalty on it. The instinctive reaction is that the penalty belongs to whoever failed to lodge, not to the person who sent the paperwork in good time.

The law half agrees with you. There is a specific provision that lifts a failure to lodge penalty off a taxpayer when the agent is the reason the document was late — the ATO calls it safe harbour. The half it doesn’t agree with is the assumption that it happens by itself. Safe harbour has two conditions, and you carry the burden of proof on the first one.

What safe harbour actually says

The ATO’s wording is short enough to keep in your head. If you engaged a registered tax or BAS agent to lodge your return or statement, you are not liable for a failure to lodge (FTL) penalty if both of the following apply: you can show you provided the agent with all relevant tax information to enable them to lodge by the due date, and the agent’s failure to lodge was not because they were reckless or intentionally disregarded the tax law.

Two words in there do most of the work. “All relevant tax information” means everything needed to prepare and lodge the document on time in the approved form — and the ATO spells out that this includes meeting the deadlines your agent sets as well as the ATO’s own, and includes a signed document where one is required. “Show” means evidence. The ATO states plainly that the taxpayer carries the burden of proof to establish that they provided all relevant information.

Note also what the provision does not reach. It can only apply to an FTL penalty, and to a false or misleading statement penalty where that statement resulted in a shortfall. It does not apply to other administrative penalties, and it does not apply where a tax avoidance scheme is involved. The tax itself, and interest on an unpaid balance, sit outside it either way.

The thing that decides it happened before you sent anything

Safe harbour is written around a registered tax or BAS agent. The Tax Practitioners Board puts it the same way: under the safe harbour provisions, taxpayers using a registered tax or BAS agent may not be liable to some administrative penalties imposed by the ATO.

That one line decides the whole question before the facts are reached. Someone who prepares returns for a fee without being on the TPB register is not a registered agent, however competent and however many people in the same suburb use them. If the return goes in late, the provision that would have moved the penalty simply does not reach you — not because of anything they did badly, but because the rule was never about them. Checking the register is free and takes about a minute, and that minute is worth more in September than in November.

Two beliefs that cost people the exemption

The first is that a professional relationship is itself the proof. It isn’t. When the ATO assesses a safe harbour request it contacts the agent for their comment on the claim that the document was lodged late due to their actions, and if the agent disputes what you say and you cannot provide enough proof, the ATO will not apply the safe harbour. A memory of a conversation is not proof. A dated email, a portal upload with a timestamp, a signed document returned on a date you can point to — those are.

There is a cooperative version of this worth knowing. Your agent can request safe harbour on your behalf, and if they admit that you provided all your information in enough time for them to lodge by the due date, the ATO will accept that admission as proof that you did. Most of these situations are not adversarial. Asking the agent to make the request is often the shortest route.

The second belief is that late is late and the exemption will sort it out. It won’t if the handover itself was late. Sending a year’s records on 28 October for a 31 October lodgment does not meet the first limb, because the information did not arrive in time to enable lodgment by the due date — and it almost certainly misses the internal cut-off the agent set, which the ATO treats as part of the same test.

If the notice has already arrived

There are two separate doors, and taking the first does not close the second. The first is the safe harbour request itself. For an amount below $10,000 the ATO says to phone; for $10,000 or more, to write, setting out the circumstances that led to the delay and why the exemption should apply. An agent can lodge the request through Practice mail in Online services for agents under the subject “Cancellation of FTL penalty (Safe Harbour)”.

The second door is remission, which is a different question — not whose fault it was, but whether the penalty should stand in your circumstances. The ATO is explicit that if it decides safe harbour doesn’t apply, you can still seek a remission of the FTL penalty. It also publishes a guide to what it tends to accept and decline. Among the circumstances where remission is likely: your registered agent was ill with a severe illness that affected their ability to assist you and it was impractical to make other arrangements, or you could not lodge because you hadn’t received information from another party such as an employer. Among those where it is unlikely: you were on holiday, you were busy with work, you had a short-term non-severe illness, you received no reminder from the ATO, or you still haven’t lodged the document. That last one is a condition rather than a preference — the ATO expects outstanding documents to be lodged before you ask.

One thing worth knowing either way: penalties the ATO imposes are not deductible.

This is general information current as at September 2026, drawn from the ATO’s safe harbour and failure to lodge on time guidance, not advice about any particular penalty or engagement. The practical version is short and all of it happens before anything goes wrong: check the register, put the handover in writing with a date on it, and ask your agent what their internal cut-off is rather than working back from 31 October. If a return is already late, lodging it is the step that has to come first regardless of which door you intend to use.

Two related pieces on the site sit next to this one: how the registered agent lodgment program decides whether your due date is 31 October, 31 March or 15 May, and what happens with a late June quarter BAS. Individual tax returns and sole trader work are two of our four service areas, and the income tax calculator is there if you want the year’s numbers in front of you before the paperwork goes anywhere.