What Records Do I Need to Keep for My Self Assessment

At Towerstone Accountants we provide specialist personal tax services, for self employed, and individuals across the UK. This article has been written to explain What records do I need to keep for my Self Assessment, in clear practical terms, so you understand how personal tax and Self Assessment rules apply in real situations. Our aim is to help you stay compliant, avoid costly mistakes, and make confident tax decisions.

Keeping records for Self Assessment is one of those things that sounds obvious in theory but causes real problems in practice. In my experience, people rarely fall behind because they are trying to avoid tax. They fall behind because record keeping feels overwhelming, unclear, or easy to put off until later.

I see the consequences of this every year. Missed expenses, understated income, rushed returns, unnecessary tax bills, and avoidable stress. The good news is that HMRC does not expect perfection. What it does expect is that you keep clear, accurate records that support the figures on your tax return.

In this article I want to explain exactly what records you need to keep for Self Assessment, how long you need to keep them for, and what HMRC is actually looking for if they ever ask questions. This is based on current UK guidance and many years of dealing with HMRC on behalf of clients.

My aim is to make this feel manageable rather than intimidating.

Why Record Keeping Matters More Than People Think

Your Self Assessment tax return is only as good as the records behind it. HMRC does not just care about the final numbers. It cares that those numbers can be supported if needed.

Good records help you to:.

• Claim all allowable expenses

• Avoid overpaying tax

• File accurately and on time

• Deal calmly with HMRC queries

• Reduce accountancy costs

Poor records usually lead to rushed decisions conservative estimates and missed claims. That almost always costs more in the long run.

The Basic Records Everyone Needs to Keep

At a minimum, anyone completing a Self Assessment tax return should be able to show where their income came from and what expenses were incurred in earning it.

The core records I expect clients to have include:.

• Details of all income received

• Dates and amounts of payments

• Bank statements covering the tax year

• Receipts or invoices for expenses

• Records of cash payments where relevant

Whether you are employed self employed a landlord or a company director the principle is the same. HMRC wants a clear audit trail.

Records for Self Employed Individuals and Sole Traders

If you are self employed your record keeping responsibilities are more extensive because you are calculating your own profit.

Income Records

You should keep records of all business income including:.

• Sales invoices issued

• Till rolls or daily takings summaries

• Payment confirmations from platforms or apps

• Bank statements showing income received

If you receive cash income it must still be recorded. Cash businesses often attract more HMRC attention simply because income is easier to understate accidentally or otherwise.

Expense Records

You should keep evidence for all business expenses you claim. This usually includes:.

• Receipts for purchases

• Supplier invoices

• Mileage logs for vehicle use

• Utility bills if claiming working from home

• Phone and internet bills where business use is claimed

HMRC does not require a receipt for every single small item but the more complete your records are the easier it is to justify your claims.

Mileage Records

If you claim mileage you should keep a simple log showing:.

• Date of journey

• Start and end point

• Purpose of the trip

• Number of miles

This does not need to be complicated. Consistency matters more than format.

Records for Landlords

If you receive rental income you must keep clear property related records.

These include:.

• Rental income received

• Letting agent statements

• Mortgage interest statements

• Repair and maintenance invoices

• Safety certificates and compliance costs

• Service charges and ground rent

I often see landlords miss allowable expenses simply because paperwork is scattered across emails and portals. Centralising these records makes a big difference.

Records for Employees Completing Self Assessment

Even if most of your income is taxed through PAYE you still need records to support your return.

These typically include:.

• P60s and P45s

• P11D forms for benefits

• Details of expenses claimed

• Records of additional income such as dividends or property

If you claim expenses such as working from home or professional subscriptions you should keep evidence showing you are entitled to claim them.

Records for Company Directors

Company directors often have a mix of personal and company related records.

You should keep:.

• Payslips and P60s

• Dividend vouchers

• Director’s loan account records

• Expense receipts paid personally

• Mileage logs for business travel

One of the most common issues I see is directors losing track of what they have paid personally for the company. Good records here prevent problems later.

How Long You Need to Keep Records

HMRC requires Self Assessment records to be kept for a minimum period.

In most cases you must keep records for at least five years after the 31 January submission deadline of the relevant tax year.

For example, for the 2023 to 2024 tax year, filed by 31 January 2025, records should be kept until at least 31 January 2030.

If HMRC opens an enquiry you may need to keep them for longer until the matter is resolved.

Digital Records and Software

HMRC accepts digital records and in many cases prefers them.

Records can be kept as:.

• Scanned copies of receipts

• Photos stored digitally

• Accounting software records

• Spreadsheets and PDFs

The key point is that records must be readable accessible and complete. A blurry photo that cannot be understood is not helpful if HMRC asks questions.

What Happens If You Do Not Have Records

This is a situation I deal with frequently.

If records are missing HMRC can:.

• Disallow expenses

• Raise estimated assessments

• Challenge the accuracy of your return

Accountants can often help reconstruct records using bank statements and reasonable estimates but this is always second best to having proper evidence.

The absence of records does not automatically mean penalties but it does weaken your position.

Common Record Keeping Mistakes I See

From my experience the most common problems are:.

• Relying on memory instead of records

• Mixing personal and business spending

• Losing receipts and assuming they are not needed

• Not recording cash income properly

• Leaving everything until the end of the year

None of these are unusual but all of them are avoidable with simple habits.

Simple Ways to Stay Organised

You do not need an elaborate system to keep good records.

What works well for most people is:.

• A dedicated folder digital or physical

• Regular monthly reviews rather than annual panic

• Taking photos of receipts as they arise

• Keeping business transactions separate where possible

Small consistent actions make Self Assessment far less stressful.

My Professional View

HMRC does not expect you to run your life like an audit file. It does expect you to be organised honest and able to explain your figures.

Good record keeping is not about ticking boxes. It is about protecting yourself claiming what you are entitled to and staying in control of your tax position.

In my experience people who keep decent records worry far less about HMRC because they know they can back up what they have submitted.

Key takeaways

Keeping records for Self Assessment does not need to be complicated but it does need to be taken seriously.

If you know what to keep keep it consistently and store it safely you put yourself in a strong position. Filing becomes easier tax bills are more accurate and HMRC becomes far less intimidating.

If you are ever unsure whether something is worth keeping my advice is simple. Keep it. It is far better to have too much information than not enough when it comes to tax.

You may also find our guidance on What should I bring to my accountant for my tax return, and When do I need to file a Self Assessment tax return, helpful when reviewing related personal tax questions. For a broader overview of Self Assessment deadlines, reporting, and obligations, you can visit our self assessment guidance hub.