Free tool
Free Tax Reminders: Never Miss a Self Assessment Deadline
Missing a Self Assessment deadline costs at least £100 in penalties, plus interest. Sign up for our free tax reminders and get a nudge before each key HMRC date for the self-employed, landlords and company directors.
✔ Free and takes 30 seconds ✔ Reminders before every key UK tax deadline ✔ Backed by qualified accountants
Get your free reminders
Key dates
UK Self Assessment deadlines for 2026/27
These are the main dates every Self Assessment taxpayer should diarise. Our reminder tool alerts you ahead of each one so you have time to gather records and pay.
| Date | What is due |
|---|---|
| 31 October 2026 | Paper Self Assessment return for 2025/26 due |
| 31 January 2027 | Online return for 2025/26 due, plus balancing payment and first payment on account for 2026/27 |
| 5 April 2027 | 2026/27 tax year ends: last day to use ISA, pension and CGT allowances |
| 6 April 2027 | New 2027/28 tax year starts; Making Tax Digital threshold drops to £30,000 |
| 31 July 2027 | Second payment on account for 2026/27 due |
| 5 October 2027 | Register for Self Assessment if you became liable in 2026/27 |
Who it is for
Who should use tax reminders?
Sole traders and freelancers
Never miss registration, the 31 January return or your payments on account.
Landlords
Track the January and July payments and the 60-day property capital gains deadline.
Company directors
Keep personal and company filing dates in one place so no penalty slips through.
High earners
Stay ahead of pension, Gift Aid and Personal Allowance planning before 5 April.
What happens if you miss a tax deadline?
HMRC charges an automatic £100 penalty if your return is even one day late, even when you owe no tax. After three months, daily penalties of £10 can add up to £900, and further charges of 5% of the tax due (or £300 if higher) apply at 6 and 12 months. Late payment brings interest and extra penalties at 30 days, 6 months and 12 months.
A simple reminder is far cheaper. Read our guides on late payment penalties, missing the deadline and appealing a penalty.
How our tax reminder tool works
- Enter your details in the reminder box above.
- Choose the dates that matter to you, such as the 31 January return and payment.
- Get reminded before each deadline so you can file or pay on time.
Prefer not to handle it yourself? Order your Self Assessment return online and our accountants will file it for you from £199 + VAT.
FAQs
Tax reminder FAQs
Yes. The reminder tool is free to use. You only pay if you choose one of our accountancy services.
The tool covers the main UK dates such as the 5 October registration, 31 October paper return, 31 January return and payment and the 31 July second payment on account.
The online return and any tax due for 2025/26 must be filed and paid by 31 January 2027. Paper returns are due by 31 October 2026.
No. A reminder tells you a date is coming; an accountant prepares and files your return accurately, so you avoid penalties altogether.
File and pay as soon as possible and contact us. You may be able to appeal if you had a reasonable excuse, and we can help with late returns.
Yes. Payments on account fall due on 31 January and 31 July, and the reminder tool can alert you before each.
Rather have an accountant handle every deadline?
Fixed fee from £199 + VAT. Pay online, send your details and let our qualified accountants do the rest.
