Self Assessment Penalties Are Changing from April 2027: What You Need to Know

If you complete a Self Assessment tax return, important changes to HMRC’s penalty regime are coming into effect from April 2027.

The familiar £100 late filing penalty is being replaced by a points-based penalty system, while the cost of paying tax late is increasing. For many taxpayers, the new rules are actually more proportionate, as an occasional missed filing deadline won’t automatically trigger a financial penalty. However, repeated late filing and late payment will become significantly more costly.

The good news is that with a little forward planning, most taxpayers should find the new system straightforward to manage.

What’s changing?

Until now, submitting a Self Assessment tax return late has generally resulted in an automatic £100 penalty, even if no tax was due. From 6 April 2027, that changes.

Instead of receiving an immediate financial penalty, taxpayers will receive a penalty point each time they miss a filing deadline.

The points-based system has already been introduced for VAT and is being rolled out for Making Tax Digital for Income Tax. From April 2027, it will apply to all Self Assessment taxpayers, regardless of whether they fall within Making Tax Digital.

Annual Self Assessment filers

receive a £200 penalty after reaching two penalty points
each additional late submission after reaching the threshold results in another £200 penalty
penalty points normally expire after 24 months, provided you remain below the penalty threshold.

Quarterly Making Tax Digital filers

receive a £200 penalty after reaching four penalty points
each additional late submission after reaching the threshold results in another £200 penalty
points won’t reset until HMRC’s compliance conditions have been met, including submitting any outstanding returns and maintaining a period of compliant filing.

Higher penalties for paying tax late

The most significant changes relate to late payment.

From 1 April 2027, HMRC will introduce higher penalties if tax remains unpaid. The new regime includes:

an initial penalty once tax is 15 days overdue, set at 4% of the outstanding tax for 2027/28 (up from the current 3%)
a further 4% penalty once tax is 30 days overdue
an ongoing penalty equivalent to 10% per annum from day 31 until the outstanding balance is paid.

Late payment interest will continue to apply separately, meaning the overall cost of delaying payment can increase quickly. For taxpayers with larger January tax bills, effective cash-flow planning will become more important than ever.

What does this mean for you?

These changes affect far more people than those within Making Tax Digital. Whether you’re a company director, landlord, sole trader, higher-rate taxpayer or someone who completes a Self Assessment return because of investment income, the new penalty rules are likely to apply to you.

For many taxpayers, the new approach is actually more forgiving. An isolated late return won’t automatically trigger a financial penalty, giving greater flexibility if something unexpected happens. However, repeated late filing and, in particular, late payment will become significantly more expensive.

If paying your January tax bill is sometimes a challenge, now is the right time to review your budgeting and cash-flow planning before the new rules take effect.

What should you do now?

Although the changes don’t begin until April 2027, establishing good habits now will make the transition much easier. We recommend that you:

Keep a record of all your filing and payment deadlines.
Submit your Self Assessment tax return well before 31 January wherever possible, giving yourself more time to plan for any tax due.
Set money aside regularly throughout the year to avoid last-minute pressure when your tax bill falls due.
If you’re concerned about paying on time, contact HMRC as early as possible. A Time to Pay arrangement agreed before penalties arise can help reduce additional charges, although interest may still apply.
Bring any outstanding tax returns up to date, as unresolved filing obligations can prevent penalty points from being reset.

A little preparation now can help you avoid unnecessary penalties and give you greater certainty over your tax position.

Frequently asked questions

Will I still receive a £100 penalty if my tax return is one day late?

No. Under the new rules, missing your first annual filing deadline will normally result in a penalty point rather than an immediate financial penalty. A £200 penalty is only charged once you reach the relevant points threshold.

Do penalty points stay on my record permanently?

No. Penalty points generally expire after 24 months, provided you remain below the penalty threshold. Once you’ve received a financial penalty, you’ll need to meet HMRC’s conditions before your points can be cleared.

Do penalty points apply if no tax is due?

Yes. The points-based system relates to late filing, not the amount of tax you owe. Even if no tax is payable, missing a filing deadline can still result in a penalty point.

Can I appeal a penalty point?

If you believe you had a reasonable excuse for filing late, you may be able to appeal HMRC’s decision. Whether an appeal is successful will depend on your individual circumstances.

Are Self Assessment payment deadlines changing?

No. The filing and payment deadlines remain exactly the same. What changes is the way HMRC penalises late payment, with penalties starting sooner and increasing more quickly than under the current system.

What happens if I can’t pay my tax bill?

If you’re unable to pay on time, don’t ignore the problem. Contact HMRC as soon as possible to discuss a Time to Pay arrangement. Acting early can help reduce the penalties you face and prevent the situation from becoming more difficult to resolve.

Preparing for April 2027

The new penalty regime is designed to encourage consistent compliance rather than punish the occasional mistake. For most taxpayers, staying organised and planning ahead will be enough to avoid penalties altogether.

Unsure how these changes could affect you?

Whether you need support with Self Assessment, cash-flow planning or understanding the new penalty rules, our team is here to help. We’ll make sure you’re prepared well before April 2027, helping you stay compliant, avoid unnecessary penalties and manage your tax obligations with confidence.