When you stop being self-employed, you must file a final Self Assessment tax return covering the period from the start of the tax year to the date you ceased trading. This guide explains what you need to do and the deadlines you must meet.

Your final return is your last opportunity to claim all available deductions, including terminal loss relief and balancing allowances on assets. Missing these claims could mean paying more tax than necessary.

Before you file: notify HMRC

You should tell HMRC as soon as possible after you stop being self-employed. This ensures they expect your final return and do not continue sending you payment on account demands for future years.

Notifying HMRC of cessation

How and when to tell HMRC you have stopped being self-employed.

Notification method: Online form (preferred) or by phone/post
Information required: National Insurance number and UTR number
Timing: As soon as possible after cessation
Low income cessation: If earning £1,000 or less, tell HMRC cessation date was 5 April (end of tax year)
VAT deregistration deadline: 30 calendar days from stopping trading
PAYE closure: Close PAYE scheme and send final payroll reports
CIS cessation: Call CIS helpline immediately

You must tell HMRC as soon as possible when you stop being self-employed. HMRC needs time to review your request before the 31 January deadline. If you delay notification, you may face penalties. VAT-registered businesses must cancel registration within 30 days of ceasing taxable supplies.

Stop being self-employed

Filing and payment deadlines

Your final Self Assessment return follows the same deadlines as any other tax year, based on when you stopped trading. The tax year runs from 6 April to 5 April.

Self Assessment cessation deadlines

Filing and payment deadlines for final Self Assessment return when ceasing self-employment.

Online return deadline: 31 January following the tax year of cessation
Paper return deadline: 31 October following the tax year of cessation
Final payment deadline: 31 January following the tax year of cessation
Late filing penalty (initial): £100 automatic penalty if up to 3 months late
Late filing penalty (daily): £10 per day for returns over 3 months late (maximum 90 days)
Late filing penalty (6 months): 5% of tax due or £300 (whichever is greater)

These deadlines apply to all sole traders and partners closing their business. The final return covers the period from the start of the tax year to the cessation date.

Self Assessment tax return deadlines

Example: If you stopped trading on 15 September 2025 (tax year 2025/26), your final return covers 6 April 2025 to 15 September 2025. The online filing deadline is 31 January 2027.

Do not wait until the deadline. HMRC recommends filing as soon as possible after cessation. This gives you time to resolve any queries and ensures you do not incur late filing penalties.

Basis period reform: what it means for your final year

From April 2024, the tax year basis applies to all self-employed businesses. This significantly simplifies final year calculations.

Basis period reform and final year rules

How basis period reform affects final Self Assessment calculations from 2024/25 onwards.

Reform effective date: 6 April 2024
New tax year basis: Businesses taxed on profits arising in the tax year itself
Final year basis period starts: Day after end of previous year's basis period
Final year basis period ends: Date of cessation
Simplification: No special cessation rules needed under tax year basis

From 2024/25, the tax year basis applies to all self-employed businesses. This simplifies final year calculations as profits are simply those arising from the start of the tax year to the cessation date.

Basis Period Reform

What this means for you: Your final year's taxable profit is simply the profit from 6 April (or your last accounting date if later) to your cessation date. There are no complex overlap rules to navigate.

Overlap relief (for businesses that started before April 2024)

If you started your business before April 2024, you may have accumulated overlap relief from when you started trading. The transition year 2023/24 was the final year to claim this relief.

Overlap relief on cessation

Rules for claiming overlap relief when ceasing self-employment, including post-reform changes.

Final claim year: 2023/24 tax year (transition year)
Post-reform status: No overlap relief available from 2024/25 onwards
Historical rule (pre-reform): Unused overlap relief given in full in year of cessation
Where to find your figure: Check 'overlap profit carried forward' on previous SA103F, SA104F, or SA104S forms
HMRC response time: Within 3 weeks (longer for complex cases)

Under Basis Period Reform, 2023/24 was the final year to claim overlap relief. All overlap profits were relieved in the 2023/24 transition year. From 2024/25 onwards, there is no overlap relief on cessation as the tax year basis prevents its creation.

Get your overlap relief figure

Action needed: If you ceased trading before 6 April 2024 and did not claim overlap relief in your 2023/24 return, you may be able to amend that return. Check your previous SA103F or SA104F/S forms for 'overlap profit carried forward'. If unsure, contact HMRC or your accountant.

Terminal loss relief

If you made a loss in your final 12 months of trading, you can carry this back against profits from earlier years. This can result in a tax refund.

Self Assessment terminal loss relief

Loss relief rules for sole traders and partners making a loss in their final 12 months of trading.

Definition: Relief for losses in final 12 months of trade
Carry-back period: 3 years before the year of cessation
Order of relief: Start with latest year, work backwards
Claim time limit: 4 years after end of year of loss
Example deadline: For 2024/25 cessation, claim by 5 April 2029

Terminal loss relief is only available when the trade has ceased in the tax year. Losses can be carried back against trading profits in the current year plus the 3 prior years. The claim must specify how the loss is allocated across the eligible tax years.

Losses (HS227) helpsheet

How to claim: Include the terminal loss relief claim on your final Self Assessment return. Specify how you want the loss allocated across eligible tax years (latest year first, working backwards).

Tax refund: If your loss relief claim reduces tax already paid in previous years, HMRC will issue a refund after processing your final return.

Capital allowances: balancing adjustments

In your final year, you cannot claim standard capital allowances like the Annual Investment Allowance. Instead, you must calculate balancing adjustments based on what happens to your business assets.

Capital allowances on business cessation

Balancing adjustments replacing standard capital allowances when closing a business.

Cessation rule: Enter balancing charge or balancing allowance instead of claiming capital allowances
Balancing charge trigger: Disposal proceeds exceed remaining pool balance
Balancing allowance trigger: Available for single asset pools or when closing business
Asset valuation rule: Use sale price, or market value if gifted, converted to personal use, or sold below value

In the year of business closure, standard capital allowance claims are replaced by balancing adjustments. A balancing charge is added to taxable profits if disposal proceeds exceed the pool balance. A balancing allowance is deducted from profits if there is unclaimed value from writing-down allowances.

Capital allowances when you sell an asset

What happens to your assets matters

The tax treatment depends on what you do with each asset:

Sold for cash: Use the actual sale price
Gifted to someone: Use market value at the date of gift
Kept for personal use: Use market value at cessation date
Sold below market value: HMRC may use market value instead
Scrapped with no value: Use nil value

Tip: If disposal proceeds exceed your remaining capital allowance pool balance, you will have a balancing charge that increases your taxable profit. Plan asset disposals carefully.

Payments on account

If you have been making payments on account based on previous years' tax bills, you can apply to reduce these now that you are ceasing to trade.

Payments on account on cessation

Reducing or adjusting payments on account when closing your self-employed business.

Payment on account threshold: Not required if previous year's tax was under £1,000
Alternative threshold: No payments on account if 80%+ already collected via tax codes or deductions at source
First payment date: 31 January
Second payment date: 31 July
Reduction deadline: 31 January after end of tax year
Reduction eligibility: Business profits or other income goes down, or tax relief goes up
Form: SA303 or online service

When ceasing self-employment, you may be able to reduce your payments on account using form SA303 or the online service. Cessation qualifies as income going down. If your actual bill exceeds your reduced payments, interest will be charged on the shortfall.

Claim to reduce payments on account

Why reduce payments on account: Your final year's income will likely be lower than previous years (especially if you traded for only part of the year). Reducing payments on account means you do not overpay and then wait for a refund.

Caution: If you reduce too much and your actual bill is higher, you will pay interest on the shortfall. Estimate carefully.

Record-keeping after you stop trading

Even after your business has closed, you must keep your records for several years in case HMRC opens an enquiry.

Record keeping after cessation

How long to keep business records after closing your self-employed business.

Standard retention period: 5 years after 31 January submission deadline
Example: 2024/25 return submitted by 31 January 2026 - keep records until end of January 2031
Very late returns: 15 months from date of submission if return submitted more than 4 years after deadline
HMRC enquiry: Keep records until enquiry is completed
Capital gains records: May need to keep older records for CGT purposes
Penalty: Penalty if records not accurate, complete and readable

You must keep business records for 5 years after the 31 January deadline for the tax year you stopped trading. If HMRC opens an enquiry, keep records until it is completed. Records may be needed for longer if you have assets held for many years where capital gains calculations are required.

How long to keep your records

What records to keep

Final accounts and tax return (keep a copy)
Bank statements for the final trading period
Invoices and receipts for income and expenses
Asset purchase and sale records (for CGT purposes)
Correspondence with HMRC
Employment records if you had staff (3 years after final pay run)

Digital copies are acceptable provided they are accurate, complete, and readable.

Step-by-step: filing your final return

Notify HMRC of cessation

Use the online service or phone HMRC to report that you have stopped being self-employed. Have your UTR and NI number ready.
Prepare final accounts

Calculate your profit or loss from the start of the tax year (or your last accounting date) to your cessation date.
Calculate balancing adjustments

Work out balancing charges or allowances on your business assets based on disposal proceeds or market values.
Consider terminal loss relief

If you made a loss in your final 12 months, calculate the amount that can be carried back to earlier years.
Complete your Self Assessment return

File online using the SA103F (full) or SA103S (short) self-employment pages. Mark this as your final return.
Apply to reduce payments on account

If your final year income is lower than previous years, submit form SA303 or use the online service to reduce payments on account.
Pay any tax due by 31 January

Pay the balance of your final year tax bill. If you are owed a refund from loss relief, HMRC will process this after your return.
Store your records securely

Keep all business records for 5 years after the filing deadline. Consider digital backups.

PARTNERSHIP Requirement

If you were in a partnership, each partner must file their own Self Assessment return covering their share of partnership profits. The partnership must also file a partnership return (SA800) for the final period.

Nominated partner: The nominated partner remains responsible for filing the partnership return even after the partnership has ceased.

Terminal loss relief: Each partner claims their own share of any terminal loss on their individual return.

Comparison to other structures:

Partnership cessation requires both individual partner returns and a final partnership return. The obligations differ from sole trader cessation.

Common mistakes to avoid

Forgetting to notify HMRC: They may keep sending demands for payments on account
Missing terminal loss relief: Losses in your final year can be carried back for refunds
Claiming capital allowances instead of balancing adjustments: Final year rules are different
Destroying records too early: Keep them for 5 years after the filing deadline
Forgetting VAT deregistration: If VAT-registered, you must cancel within 30 days of stopping taxable supplies
Not accounting for personal use assets: Assets kept for personal use must be valued at market value

Stop being self-employed

Business Context Testing

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Guvnor

File your final Self Assessment return

Before you file: notify HMRC

Filing and payment deadlines

Basis period reform: what it means for your final year

Overlap relief (for businesses that started before April 2024)

Terminal loss relief

Capital allowances: balancing adjustments

What happens to your assets matters

Payments on account

Record-keeping after you stop trading

What records to keep

Step-by-step: filing your final return

Notify HMRC of cessation

Prepare final accounts

Calculate balancing adjustments

Consider terminal loss relief

Complete your Self Assessment return

Apply to reduce payments on account

Pay any tax due by 31 January

Store your records securely

Partners must each file their own final return

Comparison to other structures:

Common mistakes to avoid

Compliance Assistant

🧪 Business Context Testing

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Before you file: notify HMRC

Filing and payment deadlines

Basis period reform: what it means for your final year

Overlap relief (for businesses that started before April 2024)

Terminal loss relief

Capital allowances: balancing adjustments

What happens to your assets matters

Payments on account

Record-keeping after you stop trading

What records to keep

Step-by-step: filing your final return

Notify HMRC of cessation

Prepare final accounts

Calculate balancing adjustments

Consider terminal loss relief

Complete your Self Assessment return

Apply to reduce payments on account

Pay any tax due by 31 January

Store your records securely

Partners must each file their own final return

Comparison to other structures:

Common mistakes to avoid

Related guides in Tax & Finance

Business Context Testing

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