Self Assessment Records – What to Keep and for How Long

/Published:9th September 2026/inDigital Nomads, Expenses, Freelancers, Self Employed, Sole Trader
Accounting Wise - self assessment records - what to keep and for how long

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Keeping good Self Assessment records might not be the most exciting part of running a business, but it can make completing your tax return considerably easier.

If you are self-employed, a landlord or otherwise required to complete a Self Assessment tax return, HMRC expects you to keep enough evidence to support the figures you report. That includes records of your income, allowable expenses and other information relevant to your tax position.

You do not normally send all of these records to HMRC when you submit your tax return. However, you need to keep them in case HMRC asks questions about your return or carries out a compliance check.

Record keeping has also become more important following the introduction of Making Tax Digital for Income Tax in April 2026, which requires some sole traders and landlords to maintain digital records using compatible software.

So, what Self Assessment records should you keep, how long should you keep them, and are digital copies of receipts acceptable? Here is what you need to know.

What Are Self Assessment Records?

Self Assessment records are the documents and information used to calculate the income, expenses, gains, allowances and reliefs included on your tax return.

The exact records you need will depend on where your income comes from. Someone running a sole trader business will have different records from a landlord, company director or individual declaring investment income.

For a typical self-employed business, your records will usually include:

  • sales invoices and records of business income
  • purchase invoices and receipts
  • business bank statements
  • records of cash sales and purchases
  • credit card statements relating to business expenditure
  • mileage and business travel records
  • details of business assets and equipment purchased
  • records of amounts paid into or withdrawn from the business
  • payroll records if you employ staff
  • VAT records if your business is VAT registered
  • CIS records if you work within the Construction Industry Scheme
  • details of grants or other taxable business support received

HMRC provides further guidance on the business records self-employed people need to keep.

What Records Do I Need for My Self Assessment Tax Return?

Your records need to be detailed enough for you, your accountant and HMRC to understand how the figures on your tax return were calculated.

Records of Your Business Income

You should keep evidence of all income received by your business, not simply the amounts that arrived in your main business bank account.

This could include:

  • sales invoices
  • till or point-of-sale records
  • online marketplace sales
  • payment processor reports
  • cash takings
  • commission income
  • fees received from customers
  • bank interest received by the business

If you accept payments through services such as PayPal, Stripe or online marketplaces, keep the underlying transaction records rather than relying solely on the amount eventually transferred into your bank account. Fees may be deducted before the money reaches you, so the bank deposit might not represent your actual turnover.

Records of Business Expenses

You should also keep evidence supporting expenses you intend to claim against your taxable profits.

Depending on your business, this could include receipts or invoices for:

  • office supplies and stationery
  • software and subscriptions
  • professional fees
  • insurance
  • advertising and marketing
  • business travel
  • telephone and internet costs
  • stock and materials
  • staff costs
  • premises costs
  • training relevant to your existing business
  • equipment and other business assets

Keeping a receipt does not automatically make an expense tax deductible. The expense must still meet the relevant rules for an allowable business expense.

Where something has both business and personal use, such as a mobile phone or vehicle, keep enough information to explain how you calculated the business proportion being claimed.

Bank and Credit Card Statements

Bank statements provide useful supporting evidence and make it much easier to reconcile your accounts.

If possible, use a separate bank account for your business transactions. A sole trader is not generally legally required to have a separate business bank account, but separating personal and business transactions can make bookkeeping much simpler.

A bank statement should not always be treated as a replacement for the original invoice or receipt. Ideally, keep both the transaction record and the supporting document showing what was purchased.

Mileage and Vehicle Records

If you claim business mileage, maintain a mileage log showing enough information to support your claim.

A useful mileage record includes:

  • the date of the journey
  • where you travelled from and to
  • the business reason for the journey
  • the number of business miles travelled

Trying to reconstruct an entire year’s mileage from your diary shortly before the Self Assessment deadline is both time-consuming and more likely to result in mistakes.

Property Income Records

Landlords completing Self Assessment should keep records relating to their rental income and property expenses.

These may include:

  • rent received
  • letting agent statements
  • insurance
  • repairs and maintenance
  • service charges
  • professional fees
  • utility bills paid by the landlord
  • finance and mortgage interest information
  • dates properties were occupied or available to rent

It is particularly important to distinguish between repairs and improvements. The tax treatment can be different, and some expenditure that cannot be deducted from rental income may instead become relevant when calculating a future Capital Gains Tax liability.

Other Personal Income and Tax Records

Self Assessment is not limited to your business accounts. You may also need records relating to other income and gains included on your return.

Examples include:

  • P60s and P45s
  • P11D benefits information
  • pension income
  • bank and building society interest
  • dividend vouchers or investment statements
  • foreign income
  • Capital Gains Tax calculations
  • pension contributions
  • Gift Aid donations

The key principle is simple: if a figure affects your tax return, keep the evidence showing where that figure came from.

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Do I Need to Keep Paper Receipts?

For many businesses, no. Your records do not all have to live in boxes of paper.

Electronic records can be used, and moving towards a properly organised digital system can make bookkeeping significantly easier. You might scan a paper receipt, photograph it using bookkeeping software or receive an invoice electronically in the first place.

Whatever system you use, the record should remain readable, complete and accessible for the required retention period.

A sensible approach is to store documents alongside the relevant transaction in your accounting software. That means that if an expense is questioned several years later, you can find the transaction and supporting invoice without searching through old emails or filing cabinets.

How Long Do Self-Employed People Need to Keep Tax Records?

If you are self-employed, HMRC says you must normally keep your business records for at least five years after the 31 January Self Assessment submission deadline for the relevant tax year.

For example, the deadline for submitting a 2025/26 online Self Assessment tax return is 31 January 2027. The records supporting that return should therefore normally be retained until at least 31 January 2032.

Simple rule: if you are a sole trader, do not throw your records away as soon as the tax return has been submitted. In practice, you will usually be retaining them for around six years after the end of the relevant tax year.

You can check the current requirements in HMRC’s guidance on how long self-employed records must be kept.

Are the Rules Different If I’m Not Self-Employed?

Yes. The five-year rule above relates specifically to business records where you are carrying on a trade, profession or business.

If you complete Self Assessment but are not self-employed, HMRC generally says records for a return submitted on time should be kept for at least 22 months after the end of the tax year.

For example, if you submit your 2024/25 return online by 31 January 2026, you would normally keep the relevant non-business records until at least the end of January 2027.

Different circumstances can produce different retention periods, so do not assume the same deadline applies to every document you hold.

What If I Submit My Tax Return Late?

Late returns can change how long you need to retain your records.

For non-business Self Assessment records, HMRC generally requires records to be kept for at least 15 months after a late return is submitted.

There are also special rules for very late self-employed returns. HMRC states that if a self-employed tax return is sent more than four years after its deadline, the supporting records must be retained for 15 months after the return is submitted.

If HMRC has opened an enquiry or compliance check, you should not destroy relevant records simply because the normal retention date has passed. Keep the documents until the matter has been concluded.

Making Tax Digital and Self Assessment Records

Record keeping changed significantly for some taxpayers from 6 April 2026 with the introduction of Making Tax Digital for Income Tax.

For the 2026/27 tax year, sole traders and landlords generally need to use Making Tax Digital for Income Tax if their qualifying income from self-employment and property is more than £50,000.

The threshold is being reduced in stages. Under the current timetable, MTD for Income Tax applies from:

  • 6 April 2026 for qualifying income over £50,000
  • 6 April 2027 for qualifying income over £30,000
  • 6 April 2028 for qualifying income over £20,000

Those within MTD for Income Tax need to use compatible software to create and store digital records of relevant self-employment and property income and expenses and submit quarterly updates to HMRC.

HMRC’s digital record-keeping guidance says each digital income or expense record will generally need to include the amount, date and relevant category.

Importantly, using MTD software does not mean you can discard all the underlying evidence. HMRC states that taxpayers should continue to retain the supporting documents used to prepare their return, such as invoices and bank statements.

What Could HMRC Ask to See?

HMRC can carry out a compliance check to make sure you are paying the correct amount of tax. If that happens, you may be asked to provide records supporting entries on your Self Assessment return.

Depending on what HMRC is checking, this could include:

  • sales and purchase invoices
  • receipts
  • bank statements
  • accounting records
  • mileage logs
  • contracts
  • property records
  • calculations supporting expenses or allowances
  • evidence supporting other income declared

HMRC does not necessarily need every document you have ever produced. A compliance check may focus on a particular part of your return, such as turnover, expenses or property income.

Good records make it much easier to respond confidently and demonstrate how your tax return was prepared.

What Happens If My Records Are Incomplete?

Missing records do not automatically mean that you cannot complete your Self Assessment, but they can create problems.

If records are lost, stolen or destroyed and cannot be replaced, HMRC says you should do your best to provide accurate figures. Where necessary, you may need to use estimated or provisional figures and identify them appropriately on your tax return.

Provisional figures should later be replaced with the actual figures when they become available.

Do not simply invent a number because a receipt has gone missing. Check whether you can obtain another copy from the supplier, bank, payment provider or online account first.

Can HMRC Fine You for Poor Record Keeping?

Failing to maintain adequate records can potentially result in penalties, particularly where poor record keeping contributes to an incorrect tax return or prevents HMRC from establishing the correct tax position.

The consequences will depend on the circumstances. HMRC can consider factors including whether an error was careless or deliberate and whether you took reasonable care when preparing your return.

This is one reason good bookkeeping matters beyond simply making life easier in January. Clear, consistent records help demonstrate that the figures reported to HMRC have been calculated properly.

Practical Ways to Improve Your Self Assessment Record Keeping

You do not need a complicated filing system. What matters is having a process you can follow consistently throughout the year.

  1. Use a dedicated business bank account. Keeping business and personal transactions separate makes reconciliation considerably easier.
  2. Record transactions regularly. Weekly or monthly bookkeeping is much easier than trying to recreate 12 months of activity in January.
  3. Digitise receipts as you receive them. Paper receipts can fade or disappear. Photographing or scanning them creates a more reliable record.
  4. Keep supporting documents with transactions. Where your software allows it, attach invoices and receipts directly to the relevant entry.
  5. Keep personal and business expenses separate. If an expense has mixed use, record how you calculated the business proportion.
  6. Reconcile your bank accounts. Regular reconciliation can identify missing transactions, duplicate entries and bookkeeping errors.
  7. Back up your records. Do not rely on a single laptop, phone or hard drive to hold years of financial information.
  8. Keep records beyond the minimum where necessary. Documents relating to assets, property or ongoing tax matters may remain relevant long after a particular Self Assessment return has been filed.

A Simple Self Assessment Records Checklist

Before preparing your return, check that you have gathered the records relevant to your circumstances:

  • business income and sales records
  • expense receipts and supplier invoices
  • business bank and credit card statements
  • mileage and travel records
  • payroll information
  • VAT and CIS records where applicable
  • property income and expense records
  • P60, P45 and P11D documents
  • savings and investment income
  • dividend records
  • pension contribution details
  • Gift Aid records
  • Capital Gains Tax calculations and supporting documents
  • details of any other taxable income

Getting these together before you start preparing the return can save a considerable amount of time and reduce the risk of missing income or allowable expenses.

Get Your Self Assessment Records in Order

Good Self Assessment record keeping is less about collecting paperwork and more about being able to show clearly how the numbers on your tax return were calculated.

For most sole traders, that means keeping complete records of income and expenses, retaining the supporting evidence and storing everything for at least five years after the relevant 31 January filing deadline. If you are within Making Tax Digital for Income Tax, digital record keeping is now an important part of that process too.

The earlier you organise your records, the easier Self Assessment becomes. You are also much less likely to overlook allowable expenses, submit inaccurate figures or find yourself searching for missing invoices days before the January deadline.

If your bookkeeping has fallen behind, you are unsure what records you need, or you would simply prefer someone else to handle your Self Assessment, Accounting Wise can help you get everything organised, prepare your return and make sure the right information is submitted to HMRC.

Request a Call Back with Accounting Wise and get your Self Assessment sorted without the January rush.

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Self Assessment Record Keeping FAQ

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You should keep appropriate evidence supporting the expenses claimed on your tax return. That could be a receipt, supplier invoice or another suitable business record. A bank transaction alone may show that money was spent, but it does not always explain what was purchased or whether the cost was genuinely business related.

HMRC can request information and documents relevant to checking your tax position. Depending on the nature of a compliance check, that may include bank statements and other financial records supporting your tax return.

Businesses can generally maintain records electronically, provided they are complete, accurate, readable and accessible when required. A reliable digital record-keeping system is often much easier to manage than storing years of paper receipts.

A sole trader should normally retain business records for at least five years after the 31 January submission deadline for the relevant tax year. For a 2025/26 return due by 31 January 2027, that generally means keeping the records until at least 31 January 2032.

Yes. Having an accountant prepare and submit your Self Assessment does not remove your record-keeping obligations. You should retain the underlying documents for the required period in case HMRC later asks to see them.

No. MTD requires qualifying taxpayers to create and maintain digital records, but HMRC also requires you to retain the supporting records used to prepare your tax return. Digital bookkeeping does not remove the need for evidence behind your transactions.

First try to obtain another copy. Suppliers can often reissue invoices, while online accounts and payment services may contain downloadable transaction records. If information genuinely cannot be recovered, keep a clear record of what happened and use the most accurate information available rather than guessing without evidence.

Sometimes. Records relating to property purchases, major assets, investments, loans or other long-term transactions may be needed for future tax calculations. If a document could affect a later Capital Gains Tax or other tax calculation, it is sensible to retain it even if the normal Self Assessment retention period has expired.

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