Why Stopping Mid-Year Changes Your Self Assessment
Most self assessment tax return guides assume you traded for a full tax year. That is the standard case. But if you stopped trading partway through the year, the rules shift. Your final return is not just another return. It is a cessation return, and HMRC treats it differently.
Whether you closed your sole trader business in September, dissolved your partnership in February, or stopped contracting through your limited company in November, you need to understand cessation rules. Get this wrong and you could overpay tax or miss a deadline that triggers penalties.
This self assessment tax return guide covers the specific rules for a part-year cessation. It applies to sole traders, partnerships, and directors of limited companies who also file self assessment for director's loan account benefits or dividend income.
What Counts as Stopping Trading Mid-Year
You stop trading mid-year when your business ceases before 5 April. The tax year runs from 6 April to 5 April. If you stopped on 31 December 2024, that is mid-year. Your final accounting period runs from 6 April 2024 to 31 December 2024, not the full 12 months.
Common scenarios include:
- A sole trader who sells their business or closes it down
- A partnership that dissolves partway through the year
- A contractor who closes their limited company and stops trading through it
- A freelancer who takes a permanent job and stops self-employment
Each scenario triggers different filing requirements. The core principle is the same: your final return covers only the period up to the cessation date, and you must report that cessation to HMRC.
Cessation Rules for Sole Traders
If you are a sole trader, your self assessment tax return for the year of cessation uses a different basis period than normal. Normally, sole traders are taxed on the profits of the accounting year ending in the tax year. That is the "current year basis". When you cease trading, you switch to a "final year basis".
Your final return covers profits from the end of your last accounting period up to the cessation date. If you prepared accounts to 31 March each year and ceased on 30 September 2024, your final return covers 1 April 2024 to 30 September 2024. You also need to include any profits from the previous year that were not yet taxed.
This is where overlap relief comes in. Overlap relief arises when you started your business and had profits taxed twice in the opening years. HMRC allows you to deduct that overlap relief from your final year's profits. The relief reduces your taxable profit in the cessation year.
To claim overlap relief, you need to know the amount of overlap profits from when you started. If you do not have the figure, check your old tax returns or call HMRC. The relief is claimed on your self assessment return in the "cessation" section.
Example: Sole Trader Cessation
Take a freelance graphic designer in Bristol who started trading in 2018. They ceased trading on 31 January 2025. Their last set of accounts ran to 31 March 2024. Their final accounting period is 1 April 2024 to 31 January 2025. Profits for that period are £18,400. They have overlap relief of £2,100 from when they started. Their taxable profit for the final year is £16,300.
They file their self assessment return for 2024/25 by the normal deadline of 31 January 2026. But they must mark the return as a "final return" and enter the cessation date. HMRC then knows not to expect future returns.
Partnership Cessation Rules
Partnerships have similar rules but with extra complexity. Each partner files their own self assessment return. The partnership itself also files a partnership return (SA800). When the partnership ceases, the partnership return covers the period up to cessation. Each partner's individual return includes their share of profits for that period.
Overlap relief applies to partners too. Each partner may have overlap relief from when they joined the partnership. The relief is deducted from their share of final year profits.
If one partner leaves but the partnership continues, that is not a cessation. Only the leaving partner's share is adjusted. The partnership continues its normal basis periods. If the partnership itself dissolves, that is a cessation for all partners.
Limited Company Directors and Self Assessment
If you are a director of a limited company, your company does not file self assessment. The company files a corporation tax return (CT600). But you as a director may still need to file a self assessment return if you have income outside PAYE.
Common triggers include:
- Dividend income above the £500 allowance
- Director's loan account benefits (beneficial loan over £10,000)
- Benefits in kind like company cars or private medical insurance
- Rental income from property you own personally
- Capital gains from selling shares or property
If you stop trading through your limited company and close the company, you still need to file self assessment for any personal income in that year. The cessation of the company does not automatically stop your self assessment requirement. You must notify HMRC if you no longer need to file.
Notifying HMRC of Cessation
You must tell HMRC that you have stopped trading. The method depends on your situation.
For sole traders, you can notify HMRC through your online account or by writing to them. Include your Unique Taxpayer Reference (UTR), the date you ceased trading, and your final accounting period. Do this as soon as possible after cessation.
For partnerships, the nominated partner must notify HMRC that the partnership has ceased. The partnership return (SA800) must be marked as final.
For limited company directors, if you have no further self assessment income after the company closes, you can deregister from self assessment. But only after the final return is filed and any tax paid.
Failure to notify HMRC can lead to penalties. HMRC may continue to issue filing reminders for returns they expect. If you ignore them, penalties accumulate. File your final return and notify cessation to stop the cycle.
Deadlines for Your Final Return
The deadline for your final self assessment return is the same as normal: 31 January following the end of the tax year. If you ceased trading in the 2024/25 tax year, the deadline is 31 January 2026. Paper returns are due by 31 October 2025.
But there is a catch. If you ceased trading and have capital gains to report from the sale of business assets, you may need to report those earlier. For UK residential property, the 60-day CGT property return applies. For other business assets sold on cessation, the gain is reported on your self assessment return by the normal deadline.
If you sold your business premises or goodwill on cessation, make sure you include the capital gain in your final return. Business Asset Disposal Relief (BADR) may apply if you held the assets for at least two years. BADR gives a 14% CGT rate for disposals from 6 April 2025, rising to 18% from 6 April 2026. The £1 million lifetime limit applies.
Overlap Relief: What It Is and How to Claim It
Overlap relief is one of the most overlooked aspects of a cessation return. Many business owners do not know they have it. Others forget to claim it. The result is paying tax on profits that were already taxed once.
Overlap relief arises because of how HMRC taxes opening years. When you started your business, your first tax return may have included more than 12 months of profits. Those extra months were taxed twice: once in the opening year and again in the final year. Overlap relief corrects that.
To claim overlap relief, enter the amount in the "overlap relief" box on your self assessment return. The box is in the self-employment pages (SA103). If you file online, the software should prompt you for it. If you use a paper return, look for box 73 on the SA103F or SA103S.
If you do not know your overlap relief figure, HMRC can provide it. Call the self assessment helpline with your UTR and they will tell you the amount. Alternatively, check your opening year tax return. The overlap relief should have been recorded there.
What Happens to Your Accounting Records
After cessation, you must keep your business records for at least five years from the 31 January following the tax year. For a cessation in 2024/25, keep records until at least 31 January 2031. HMRC can ask to see them during that period.
Records include invoices, receipts, bank statements, payroll records, and any contracts. If you used accounting software like Xero, FreeAgent, or QuickBooks, keep the data export. If you close your software subscription, download a permanent copy first.
If you sold the business as a going concern, transfer the records to the buyer. Keep copies for yourself. If you dissolved the company, Companies House requires you to keep records for a further period. Check the specific rules for your company type.
Making Tax Digital and Cessation
Making Tax Digital for Income Tax (MTD for ITSA) is mandatory from April 2026 for self-employed individuals and landlords with qualifying income over £50,000. From April 2027, it applies to those with income over £30,000. From April 2028, for those over £20,000.
If you ceased trading before MTD for ITSA applies to you, you do not need to worry about quarterly updates. Your final return is filed through the normal self assessment process. But if you ceased trading after MTD for ITSA started for you, you must submit your final quarterly update and then a final end-of-period statement. The cessation date must be recorded in your MTD-compatible software.
If you are unsure whether MTD for ITSA applies, check your total self employment and property income for the last tax year. If it was above the threshold, you are in scope.
Common Mistakes on Cessation Returns
The most common mistakes we see as ICAEW qualified accountants are:
- Filing a full-year return instead of a part-year return. This overstates profits and tax due.
- Forgetting to claim overlap relief. This costs the business owner real money.
- Not notifying HMRC of cessation. This triggers penalty notices for future returns.
- Missing capital gains on asset sales. The sale of goodwill or premises on cessation is a disposal for CGT.
- Confusing company cessation with personal self assessment cessation. Closing the company does not automatically stop your personal filing requirement.
Each of these mistakes can be avoided with a proper review of your cessation return. If you are unsure, speak to a qualified accountant before filing.
What to Do Next
If you have stopped trading mid-year, start by gathering your records up to the cessation date. Work out your final profit figure. Check your opening year tax return for overlap relief. Notify HMRC of the cessation date.
File your final self assessment return by the deadline. Include all income sources, not just the business profits. If you sold assets, report the capital gains. Claim any reliefs you are entitled to, including BADR and overlap relief.
After the return is filed and tax paid, confirm with HMRC that no further returns are expected. Keep your records for the required period.
If your circumstances are complex, or if you are unsure about any step, our team at Holloway Davies can help. We handle cessation returns regularly and know the specific rules that apply.