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Getting Ready for the 31st January Tax Deadline: A Countdown Guide

Year End & Deadlines
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For millions of sole traders and self-employed people across the UK, the 31st January is the most important date in the financial calendar. It is the deadline for filing your online Self-Assessment tax return and for paying any tax you owe for the previous tax year. As the date gets closer, it can be a significant source of stress and anxiety.

The key to a stress-free tax deadline is to be prepared. Leaving everything to the last minute is a recipe for panic, mistakes and potentially costly penalties. This guide gives you a calm, simple countdown to help you get ready for the 31st January deadline well in advance.

3 Months Before the Tax Deadline (End of October)

With three months to go, you are in a great position. There is plenty of time to get organised without any pressure.

Gather Your Business Records

Find a folder or a box and start putting all your business paperwork for the tax year in one place. This includes:

  • your sales invoices
  • your expense receipts
  • your business bank statements

Income from Employment

If you have an employed job as well as a sole trader business, you will need to record your annual earnings and the tax already deducted. The easiest way is to use your P60, the annual summary your employer gives you.

You will also need to record any benefits in kind from your employed job, such as a company car. Your P11D will show these.

Student Loans

If you have a student loan, please provide:

  • the amount of the loan
  • any deductions from your employment income
  • whether the loan is likely to be repaid within the next two years

Savings and Investment Income

  • Bank interest: interest received on all bank accounts, except ISAs. Your bank should issue a dedicated interest statement.
    • If you are married and have a joint account, HMRC splits the interest exactly 50/50.
    • If you have a joint account and are not married, you can split the interest in proportion to the money each of you has paid in.
  • UK dividends and other distributions
  • Other investment income: for example, stocks and shares or trading on the stock exchange
  • Foreign income: any income from foreign investments

Property, Trusts and Partnerships

  • Property income: rental income, for example from a second home
  • Trusts and estates: any withdrawals from trusts and estates
  • Partnership income: your share of any partnership trading income, taxed and untaxed investment income, dividends, property income or trade charges

Pensions, Benefits and Share Schemes

  • Pensions and State Benefits: any pension or State Benefit withdrawals
  • Private pension contributions: any personal contributions you have made
  • Share schemes: details of any employee share schemes

Charitable Giving

Keep a record of any charitable donations you have made. These need to be direct personal payments to charities, not money raised through fundraising platforms such as GoFundMe.

Other Payments and Reliefs

Please also give details of any payments you have made for:

  • Annuities and Annual Payments
  • Community Investment Tax Relief
  • Corresponding Deficiency Relief
  • EIS Scheme Relief
  • Gift Aid and Covenants
  • Gifts to Charities
  • Maintenance
  • Partnership Trade Charges
  • Payroll Giving
  • Post Cessation Expenses
  • Qualifying Interest
  • Redemption Relief on Bonus Shares
  • SEIS Relief
  • Social Investment Relief
  • UK Patent Royalty Payments
  • Venture Capital Trusts

Check for Missing Information

As you gather your records, you might notice some gaps. Perhaps you are missing a bank statement or a receipt for a large purchase. Now is the perfect time to track down this missing information.

Get a Rough Idea of Your Numbers

You don’t need to do a detailed calculation yet. But having a rough idea of your income and expenses will help you estimate your potential tax bill.

Contact Your Accountant

If you use an accountant, now is a great time to let them know you are getting your records together. They will be able to tell you exactly what they need from you.

1 Month Before the Tax Deadline (End of December)

By the end of December, you should aim to have all your information ready to go. The Christmas break can be a great time to get your tax return sorted, leaving you with a clear head for the new year.

Complete Your Record-Keeping

Go through all your paperwork and create a final summary of your total income and your total expenses for the tax year.

Calculate Your Profit

Subtract your total expenses from your total income to arrive at your taxable profit.

Complete Your Tax Return

If you file your own tax return, now is the time to log in to the HMRC portal and start filling it in.

If you use an accountant, aim to send them all your information by the end of December at the latest. This leaves January free to complete your tax return and to deal with any queries or missing information.

Find Out How Much Tax You Owe

Once your tax return is complete, you will know your final tax bill for the year. It will also tell you if you need to make Payments on Account for the following year.

1 Week Before the Tax Deadline (Late January)

If you have followed the steps above, by late January you should be in a calm and controlled position. All the hard work is behind you.

Do a Final Review

Read through your completed tax return one last time to make sure everything is correct.

Submit Your Return

Once you are happy, press the “submit” button to file your return with HMRC. HMRC will instantly confirm that it has received your return.

Arrange Your Payment

Make sure you have enough money in your bank account to pay your tax bill. You can pay online by bank transfer, debit card or Direct Debit.

By getting everything done before the final week, you avoid the last-minute rush, when the HMRC website can be slow and phone lines can be busy.

When Getting Advice Can Help

Meeting the 31st January deadline is a legal requirement, and the penalties for being late can be significant. You are not expected to be a tax expert, and getting professional help can be a very worthwhile investment. An accountant can take the stress out of the process, ensure your tax return is accurate, and make sure you are claiming all the expenses you are entitled to.

If you would like calm, practical support, Penney’s Accountancy works with UK small businesses in Farnborough and the surrounding areas. We can take care of your entire Self-Assessment process, from preparing your accounts to filing your return and letting you know how much tax to pay.

Want to Learn More in Your Own Time?

For those who want to build their confidence and understand these topics in more detail, Penney’s Finance School offers an online, self-paced business and finance course. It covers everything from company setup to cash flow and tax, allowing you to learn at your own pace.

Important information

The information provided in this article is intended as general guidance for UK businesses only and reflects UK tax legislation and HMRC guidance as of September 2026.

Tax rules and business requirements can change, and individual circumstances vary. Before acting on any of the information above, we recommend speaking to a qualified accountant who can provide advice tailored to your specific situation.