Closing as a sole trader: what to tell HMRC and what tax return you still need

Closing as a sole trader can feel like a big step, even if the decision is the right one. You may be moving into employment, retiring, switching to a limited company, or simply stopping because the business no longer works for you.

Whatever the reason, there is one thing you should not ignore: HMRC still needs to be told properly.

The UK had around 3.2 million sole proprietorships at the start of 2025, so you are certainly not alone if you are dealing with sole trader tax rules. But closing down is not just a case of stopping work and leaving your records in a folder. You may still need to file a final Self Assessment tax return, report your last trading date, pay any tax due, and deal with VAT or payroll if they apply.

If you are unsure where to start, working with an accountant for sole trader can help you close things down properly without unnecessary stress.

1. Tell HMRC you have stopped being self-employed

When you stop trading as a sole trader, you must tell HMRC that your self-employment has ended. This is separate from simply not earning any more money.

HMRC will usually ask for your:

• National Insurance number
• Unique Taxpayer Reference, also known as your UTR
• Date you stopped trading
• Details of your business activity

Your final trading date matters because it tells HMRC which tax year your business ended in. For example, if you stopped trading on 30 September 2026, that date falls in the 2026/27 tax year. You would normally still need to report the income and expenses up to that date on your final Self Assessment tax return.

A self-employed accountant can help make sure the date, figures and final return all match, so HMRC does not receive confusing or incomplete information.

2. You still need to send a final Self Assessment tax return

One common mistake is thinking that closing your sole trader business means you do not need to file another tax return. In most cases, you still do.

Your final tax return should include your trading income up to the date you stopped, your allowable business expenses, any capital allowances, and your final profit or loss.

You may also need to include other income on the same return, such as employment income, rental income, dividends, savings interest or pension income. Your Self Assessment return covers your whole personal tax position, not just your sole trader work.

If your records are not fully up to date, it is worth using tax return accounting services before the deadline, rather than trying to pull everything together at the last minute.

3. Work out your final income and expenses carefully

Your final tax return should show the money you earned and the costs you paid before closing.

This can include:

• Sales made before your closing date
• Unpaid invoices that still count as income
• Stock or tools sold before closing
• Final bills for phone, internet, insurance or software
• Accountancy fees
• Postage, stationery or admin costs linked to closing the business

Do not forget small costs. If they were wholly and exclusively for your business, they may still be allowable. Even £100 or £200 of missed expenses can make a difference to your final tax bill.

This is where proper sole trader accountancy services can be useful, especially if you have several months of bank payments, receipts and invoices to tidy up.

4. Check if you sold business assets

If you sold business equipment, a vehicle, tools, machinery, furniture or other assets, you may need to include this in your final tax calculations.

For example, if you claimed capital allowances on equipment and later sell that equipment, HMRC may expect an adjustment. In some cases, this can create a balancing charge, which increases your taxable profit. In other cases, you may have a balancing allowance, which could reduce your taxable profit.

You may also need to consider Capital Gains Tax if you dispose of certain business assets. This does not apply to every sole trader, but it is important not to overlook it if you owned valuable assets.

Getting sole trader accounting support before submitting the final return can help you avoid under-reporting or overpaying.

5. Cancel VAT registration if you are VAT registered

If your sole trader business is VAT registered and you have stopped trading or stopped making taxable supplies, you normally need to cancel your VAT registration.

You should also prepare and submit your final VAT return. This may include VAT on stock, assets or equipment still held at the date of cancellation, depending on the value and circumstances.

If you are unsure what to include, professional VAT return filing services can help you deal with the final VAT return correctly.

This is especially important because VAT errors can be expensive. A small mistake on stock, equipment or unpaid invoices can lead to HMRC questions later.

6. Close payroll if you employed staff

If you employed people through PAYE, closing as a sole trader also means dealing with payroll properly.

You may need to:

• Send your final payroll submission to HMRC
• Mark it as your final submission
• Pay any remaining PAYE and National Insurance
• Give employees their P45s
• Deal with holiday pay or final wages
• Close your PAYE scheme

If you had employees, do not leave payroll until after your business has already closed. Final payroll errors can affect your employees as well as your own HMRC record.

For this part, payroll services for businesses in Slough can help you close payroll correctly and avoid missing key submissions.

7. Ask HMRC to remove you from Self Assessment if you no longer need it

After your final return has been submitted, you may still need to tell HMRC that you no longer need to send Self Assessment tax returns in future.

This is important because HMRC may continue issuing tax return notices if you remain on the Self Assessment system. If HMRC asks you to file a return and you ignore it, penalties can apply even if you believe you no longer owe tax.

You may still need to remain in Self Assessment if you have other income, such as rental income, high investment income, foreign income, or other untaxed earnings.

If you are unsure, accountants for self-employed individuals can check whether you should stay registered or ask HMRC to close your Self Assessment record.

What happens if you made a final loss?

Your final year may show a loss, especially if income reduced but closing costs continued.

This is worth reviewing properly because you may be able to use terminal loss relief in some cases. This may allow certain final-year trading losses to be set against profits from previous tax years, which could reduce tax already paid and potentially create a repayment from HMRC.

The rules can be technical, so do not assume a loss has no value. Before you submit your final figures, it is sensible to check whether the loss can be used.

Keep your records after closing

Even after closing, you should keep your business records. This includes invoices, receipts, bank statements, mileage logs, payroll records, VAT records, and any documents used to prepare your final return.

HMRC can ask questions after your return is filed, so you need evidence to support your figures. Digital bookkeeping software can make this easier, especially if your records are currently spread across emails, bank statements and paper receipts.

A certified QuickBooks accountant can help organise your records before you close, so your final accounts are much easier to prepare.

Do not leave the final return until January

The online Self Assessment deadline is usually 31 January after the end of the tax year. However, waiting until the final week is risky.

You may need time to find missing invoices, check bank transactions, calculate capital allowances, confirm VAT, review losses or speak to HMRC. Filing earlier also gives you more time to budget for any tax due in £.

For example, if you close in the 2026/27 tax year, your online return and payment will usually be due by 31 January 2028. Leaving everything until January 2028 could create unnecessary pressure.

With reliable sole trader accounting services, you can close the business properly, understand what you owe, and avoid last-minute stress.

Final thoughts

Closing as a sole trader does not have to be complicated, but it does need to be handled properly. You need to tell HMRC, file your final tax return, report your last trading date, deal with VAT or payroll if relevant, and check whether any final losses or asset sales affect your tax bill.

If you want clear, practical support with closing your sole trader business, Asmat & Co Accountants can help you prepare your final accounts, submit your return and deal with HMRC from start to finish.

Get in touch today and let us take care of the numbers, so you can close this chapter with confidence.

FAQs

Do I need to tell HMRC if I stop being a sole trader?

Yes. If you stop trading as a sole trader, you should tell HMRC that your self-employment has ended. You will usually need your National Insurance number, UTR and final trading date.

Do I still need to file a tax return after closing my sole trader business?

In most cases, yes. You usually need to file a final Self Assessment tax return showing your income, expenses, final profit or loss, and any other taxable income for that year.

What date should I use as my final trading date?

Your final trading date is normally the date your sole trader business actually stopped trading. This could be the last day you provided services, sold goods, or carried out business activity.

What happens if I made a loss in my final year?

You may be able to claim tax relief for your final trading loss, depending on your circumstances. In some cases, terminal loss relief may allow losses to be set against earlier profits.

Do I need to cancel VAT when I close as a sole trader?

Yes, if your business is VAT registered and you stop trading or stop making taxable supplies, you normally need to cancel your VAT registration and submit a final VAT return.