top of page

Missed Your Self-Assessment Tax Deadline? Here's What to Do Next

Missing the self-assessment tax return deadline can be a stressful experience for anyone. Whether due to unforeseen circumstances or simple oversight, it's important to know that all is not lost. In this blog post, we'll guide you through the steps you should take to mitigate the impact of missing the deadline and how to prevent it from happening in the future.

Missed Self-Assessment Deadline
Missed Self-Assessment Deadline

Don't Panic, Act Quickly if you Missed Self-Assessment Deadline

First and foremost, it's crucial not to panic. While missing the deadline can result in penalties, acting quickly can help minimize the impact. The longer you wait, the more you may have to pay, so it's in your best interest to submit your return as soon as possible after realizing the mistake.

It's crucial to understand the consequences of missing the deadline. The immediate effect is a late filing penalty. As of 2024, the penalty regime includes an initial £100 fine, which applies even if there is no tax to pay or the tax due is paid on time. Further charges and interest may accrue if the delay continues, including daily penalties after three months, additional penalties at six and twelve months, and interest on the outstanding tax owed.

Take Immediate Action

The best course of action is to complete and submit your tax return as soon as possible. Here are the steps you should take:

1. Gather Your Documents: Collect all necessary financial records, including income statements, expenses, and any relevant tax documents.

2. Access Your HMRC Account: Log in to your HMRC online account to fill out your self-assessment tax return.

3. Seek Professional Help: If you're unsure about any part of the process or if your situation is complex, consider seeking the advice of an accountancy professional. In EvolveBooks Accountancy Services we can help ensure your tax return is completed accurately and advise on any potential ways to reduce your tax liability.

Submit Your Return ASAP

The most critical step is to submit your tax return as soon as possible. Even if you cannot pay the full amount of tax you owe immediately, submitting your return will prevent further late submission penalties. Once your return is filed, you'll have a clearer picture of what you owe, including any penalties.

Appeal Against Penalties

If you have a reasonable excuse for missing the deadline, you may appeal against the penalties. HMRC considers various circumstances as a reasonable excuse, such as serious or life-threatening illness, technical issues with the HMRC website close to the deadline, or unforeseen life events. Documentation and evidence supporting your claim will be necessary, and an accountant can help you prepare and present your case to HMRC.

Arrange a Payment Plan

If you're unable to pay the full amount of tax due, you might be able to arrange a payment plan with HMRC. This Time to Pay arrangement allows you to spread the cost over an agreed period. Interest will be applied to any outstanding amount, but this approach can make managing your payments more manageable.

Prevention is Key

To avoid future stress and potential penalties, take proactive steps to ensure you meet the next deadline:

- Set Reminders: Mark the submission deadline (31st January for online returns) in your calendar, setting reminders in the months and weeks leading up to it.

- Organize Your Records: Keep your financial records organized and up-to-date throughout the year to simplify the submission process.

- Consider Professional Assistance: Engaging with an accountancy practice can relieve the burden of tax returns. They can manage your finances, keep you compliant with tax laws, and often find ways to optimize your tax situation.


Missing the self-assessment tax deadline is not the end of the world, but it is a situation that requires immediate attention. By understanding the consequences, taking action to submit your tax return, appealing penalties if you have a reasonable excuse, and taking steps to prevent future occurrences, you can navigate this situation with minimal stress. Remember, professional accountants are here to help you through every step of this process, ensuring you stay compliant and financially healthy.

8 views0 comments


bottom of page