Let’s Break This Down Together…
Missing your Self Assessment deadline and feeling panicked? You’re definitely not alone, thousands of people end up a few days late every year and wonder what happens next.
This article explains what to do right away to limit penalties, how HMRC’s fines work, and what counts as a reasonable excuse. You’ll also learn about payment plans, appeals, and how to avoid future trouble.
By the end, you’ll know exactly how to get back on track and keep HMRC off your back. Let’s dive in and sort it all out together!
I've Missed My Deadline By a Few Days – What Should I Do Now?
File your tax return immediately! This is the most important step to prevent further penalties from accumulating. Every day matters when you’re already late.
Pay any tax you owe as soon as possible. If you do not pay your tax bill on time, late payments and late payment penalties will accrue, and interest is charged on any tax bill late. While the £100 late filing penalty is fixed, interest on unpaid tax continues to grow until you’ve paid.
If you can’t pay the full amount, contact HMRC about setting up a payment plan. They’re often willing to arrange manageable instalments if you’re proactive. You can also set up a pay arrangement or a budget payment plan through HMRC if you are unable to pay your tax liability in full. You will need your unique taxpayer reference when contacting HMRC about payments or arrangements.
Gather any evidence that might support a ‘reasonable excuse’ claim. HMRC doesn’t accept many excuses, but genuine emergencies might qualify for an appeal. If you are unable to pay, you should still pay as much money as you can to reduce additional penalties and charged interest.
You need to complete your self assessment tax return and make all necessary payments to avoid further penalties.
Understanding the Penalty System
The £100 immediate penalty is just the beginning if you don’t file quickly. If you continue to miss deadlines, potential penalties can quickly add up, including increasing fines and interest charged by HMRC for late registration, late filing, or late payment of taxes. Here’s how penalties escalate over time.
- After 3 months late (May 1st onwards): £10 daily penalties begin, up to a maximum of £900 over the next 90 days.
- After 6 months late (August 1st): An additional penalty of 5% of the tax due or £300 – whichever is greater.
- After 12 months late (next January 31st): Another 5% or £300 penalty. In serious cases, further penalties could reach up to 100% of tax due.
I once helped a client who’d forgotten about his return until February 3rd. By filing immediately, he avoided all penalties beyond the initial £100 charge.
HMRC may consider appeals or reductions of penalties on a case-by-case basis, taking into account individual circumstances and reasonable excuses.
