A client recently came to me after receiving a late filing penalty from HMRC for their 2024/25 Self Assessment tax return.
They had not ignored HMRC out of carelessness.
They had done what most sensible people would do: they went onto GOV.UK, used the “Check if you need to send a Self Assessment tax return” tool, and came away with the impression that they did not need to file.
Then the penalty letter arrived.
If that sounds unfair, I understand why.
But this is the rule most people miss: if HMRC asks you to file a Self Assessment tax return, you usually still need to act even if the GOV.UK checker suggests otherwise. GOV.UK’s Self Assessment overview says, plainly, “You must send a return if HMRC asks you to.”
That distinction is where a lot of taxpayers, especially limited company directors, landlords and people with dividend income, get caught out.
In this guide, I will explain:
- who usually needs to submit a Self Assessment tax return
- why the GOV.UK checker can still leave people exposed
- what happens if HMRC has already issued a notice to file
- what to do if you have already received a late filing penalty
If you are a director taking a mix of salary and dividends, you may also want to read our guide on salary vs dividends for directors and our Limited company vs sole trader explainer, as those questions often overlap with Self Assessment filing issues.
The short answer
You may need to submit a Self Assessment tax return if you are self-employed, have certain untaxed income, are a partner in a partnership, are caught by a specific tax charge, or HMRC has asked you to file. GOV.UK also says that if you are not sure, you can use the checker. But the most important rule is still the first one: if HMRC asks you to send a return, you need to deal with that unless HMRC confirms otherwise.
The issue most people misunderstand
A lot of people assume these two things mean the same thing:
- “The GOV.UK checker suggests I do not need to file.”
- “HMRC no longer expects a tax return from me.”
They do not mean the same thing.
The checker is only an information tool. GOV.UK says it helps you find out if you need to send a tax return for the relevant year, and it also says the tool will not send your details to HMRC. That means the checker does not update your HMRC record, does not remove you from Self Assessment, and does not cancel a notice to file.
So a person can quite genuinely use the checker, believe they do not need to file, and still end up with a penalty because HMRC had already issued a notice to file and had not withdrawn it. That is the trap.
Who usually needs to submit a Self Assessment tax return?
GOV.UK’s guidance says you may need to submit a return if any of the following apply.
1) HMRC has asked you to file
This is the most important category for this article.
If HMRC issues a notice to file, you generally need to submit the return unless HMRC agrees you no longer need to. GOV.UK’s overview is explicit on this point.
2) You are self-employed and need to report your income
GOV.UK says you must tell HMRC by 5 October if you need to complete a tax return for the previous tax year and you are newly within Self Assessment or returning to it after not needing to file the year before.
3) You are a partner in a business partnership
This remains one of the standard triggers for filing a return.
4) You have untaxed income
Common examples include rental income, foreign income, tips and commission, and investment income that is not fully dealt with through PAYE or other withholding. GOV.UK includes these as common reasons someone may need to send a return.
5) You are caught by a specific tax charge
Some taxpayers need to file because of a separate reporting obligation, for example the High Income Child Benefit Charge. GOV.UK flags this within its “who must send a tax return” guidance.
Do all limited company directors need to file a tax return?
No. Being a limited company director does not, by itself, automatically mean you must file a Self Assessment tax return every year.
That said, many directors still do need to file because of how they are paid or because HMRC already has them within Self Assessment. A director taking a mix of salary and dividends, receiving benefits, or having other untaxed income may still need to file depending on the facts. And if HMRC has already issued a notice to file, that has to be dealt with directly rather than ignored.
That is why directors are particularly exposed to this confusion. They often think:
“I only take a small salary through PAYE, so I probably do not need a return.”
Sometimes that conclusion is right. But the filing obligation is not decided by assumption alone. It also depends on whether HMRC has formally asked for a return and whether that requirement has been withdrawn.
Why the GOV.UK checker is helpful, but not enough on its own
The GOV.UK checker is useful as a first pass. It helps people sense-check their position for the year.
But it is not a substitute for confirming your actual HMRC filing position.
The page itself says the tool will not send your details to HMRC. That means it does not:
- tell HMRC you no longer need to file
- withdraw a notice to file
- stop an automated late filing penalty from being issued
- change your Self Assessment record.
This is exactly why someone can do what looks like the right thing and still receive a £100 late filing penalty.
What should you do if you think you no longer need to file?
GOV.UK says: tell HMRC as soon as possible if you believe you no longer need to send a tax return. HMRC needs time to review the request before the 31 January deadline, and GOV.UK warns that you may still have to pay a penalty if you do not tell them early enough.
That is the practical step many people miss.
They use the checker, feel reassured, and stop there.
But the correct action is to ask HMRC to review whether the return is still required. Until HMRC confirms that, the filing obligation may still stand.
What happens if you do not file on time?
GOV.UK’s penalties guidance says the standard late filing penalties are:
| Delay | Typical penalty |
|---|---|
| 1 day late | £100 fixed penalty |
| More than 3 months late | £10 per day, up to 90 days |
| More than 6 months late | 5% of tax due or £300, whichever is greater |
| More than 12 months late | A further 5% of tax due or £300, whichever is greater |
These penalties can apply even where the taxpayer believes they did not need to file, unless HMRC agrees the return was not required.
Worked example: when the checker and HMRC letters do not match
Here is the practical version of what often happens.
| Situation | What the taxpayer sees | What HMRC sees | What should happen next |
|---|---|---|---|
| Limited company director paid mainly through PAYE, with some dividends | “The checker suggests I may not need to file” | “A notice to file was already issued” | Do not ignore the notice. Ask HMRC to confirm whether the return is still required |
| Taxpayer previously filed returns but now believes their affairs are simple | “I no longer seem to fit the usual Self Assessment categories” | “Still within Self Assessment until removed” | Tell HMRC as soon as possible that you believe you no longer need to file |
| Late filing penalty arrives | “This must be wrong because I thought I did not need a return” | “Return not filed by deadline” | Review whether HMRC should withdraw the notice to file and whether an appeal is appropriate |
The lesson is simple: checker result and HMRC filing status are related, but they are not the same thing.
Can you appeal a late filing penalty?
Yes. GOV.UK says there is a specific process to appeal a Self Assessment penalty for late filing or late payment, and in general you usually have 30 days from the date the penalty was issued to contact HMRC or make an appeal.
That does not mean every penalty will be cancelled. But if HMRC agrees you did not need to send a return, or that the filing obligation should have been withdrawn, that is clearly relevant. The important point is to act quickly and not assume the letter will sort itself out.
What to do today if you have received a penalty already
If you have already received a late filing penalty, the practical steps are:
- Check whether HMRC had actually issued a notice to file for that year.
- Review whether you genuinely needed to be in Self Assessment based on your facts for the year.
- If you believe you no longer needed to file, tell HMRC as soon as possible and ask them to review the position.
- Check the penalty date and whether you are still within the normal appeal window.
- Get advice before assuming either that HMRC is definitely right or definitely wrong.
If you are also unsure about dividends, director pay, or whether a limited company structure has changed your filing obligations, read our [salary vs dividends for directors] guide and our [tax planning for business owners] hub.
Why this matters for directors and business owners
This issue is not really about paperwork.
It is about people making a reasonable decision based on the information in front of them, and then discovering that HMRC’s process works differently.
For directors and business owners, that can be particularly frustrating because their affairs often sit in the grey area between “simple” and “not simple enough for HMRC to leave alone”.
That is why the safest approach is not:
“I used the checker, so I’m done.”
It is:
“I used the checker, but I still need to confirm whether HMRC expects a return from me.”
Final word
If you are asking, “Do I need to submit a Self Assessment tax return?”, there are really two separate questions:
First: based on my income and circumstances, do I look like someone who should be in Self Assessment?
Second: has HMRC actually asked me to file, and have they formally confirmed if I no longer need to?
Most people only ask the first question.
The second one is the one that tends to trigger the penalty letters.
If you are a company director, landlord or business owner and you have received a filing notice or late filing penalty, it is worth getting the position checked properly before you assume the issue is straightforward.
Book a 20-minute planning call if you want help reviewing whether you needed to file, whether HMRC should withdraw the notice to file, or whether a penalty may be appealable.
FAQ
Do I need to submit a Self Assessment tax return if HMRC sent me a letter?
Usually, yes. GOV.UK says you must send a return if HMRC asks you to. If you believe you no longer need to file, you should tell HMRC as soon as possible and ask them to review the position.
Does the GOV.UK Self Assessment checker tell HMRC I do not need to file?
No. GOV.UK says the checker will not send your details to HMRC. It is an information tool only.
Do all limited company directors need to file a tax return?
No. Director status alone does not automatically mean a tax return is required every year. But many directors do still need to file because of dividends, other untaxed income, or because HMRC has already issued a notice to file.
What if I think I no longer need to submit a tax return?
GOV.UK says you must tell HMRC as soon as possible. HMRC needs time to review the request and confirm whether a return is still required.
What is the penalty for filing a Self Assessment tax return late?
The standard late filing penalty starts at £100, with further penalties if the return remains outstanding for more than 3, 6 and 12 months.
Can I appeal a Self Assessment late filing penalty?
Yes. GOV.UK has a formal process for appealing Self Assessment penalties, and you usually have 30 days from the date the penalty was issued to act.