Self-employed accounting guide for sole traders in the UK

Published Friday 15 May 2026

Table of contents

• What are self-employed accounts?
• How to manage your own accounts when self-employed in the UK
• Understanding allowable business expenses
• Common self-employed accounting mistakes
• Managing cash flow as a self-employed person
• How long to keep self-employed accounts
• Is it worth getting an accountant when you're self-employed?
• Simplify self-employed accounting with Xero
• FAQs on self-employed accounting

Key takeaways

• Self-employed accounts are the financial records you keep as a sole trader, covering income, expenses, tax returns and cash flow. Accurate records are essential for tax compliance and understanding your business finances.
• Cash basis accounting is now the default method for sole traders from the 2024/25 tax year onwards. You only need to record income and expenses when money changes hands, which simplifies bookkeeping for most self-employed people.
• Key tax changes affect how you manage your accounts: the VAT threshold is £90,000, Class 2 National Insurance contributions have been abolished, and Making Tax Digital for Income Tax is live from April 2026 for those earning over £50,000.
• Cloud accounting software with bank feeds, automated reconciliation and MTD compatibility can save you significant time on admin and help you stay compliant with HMRC requirements.

What are self-employed accounts?

Self-employed accounts are the records of income and expenditure kept by sole traders. These records form the basis of your annual self assessment tax return and give you a clear picture of your business finances.

Maintaining your self-employed accounts is essential for tax compliance, but also for understanding the financial health of your business. If you need to apply for a business loan or pitch to investors, they will want to review your financial records first.

There are several moving parts to self-employed accounting: keeping accurate records of income and expenditure, sending invoices, filing tax returns, claiming allowable expenses and managing cash flow. With approximately 4.38 million self-employed workers in the UK (ONS, Q4 2025), getting your accounting right is a challenge many sole traders share.

How to manage your own accounts when self-employed in the UK

You can manage your own accounting as a self-employed person in the UK, even without a professional background in finance. The following eight steps will guide you through the essentials of setting up and maintaining your self-employed accounts.

1. Register as a sole trader

If you have earned income of more than £1,000 from self-employment in the past tax year, you need to register as a sole trader with HMRC. You can do this on the GOV.UK website by following the link on registering for self assessment and setting up as a sole trader via your Government Gateway account.

You will receive a UTR (unique taxpayer reference) number in the post within two to three weeks. You need this to submit your self assessment tax return, so keep it in a safe place.

The deadline for registering is 5 October following the end of the tax year. For example, if you earned above £1,000 between April 2025 and April 2026, you would need to register by 5 October 2026. Read the guide on how to register as a sole trader for more detail.

2. Choose your accounting method

From the 2024/25 tax year, cash basis accounting is the default method for sole traders. Under cash basis, you record income and expenses only when money changes hands. If you want to use traditional (accrual) accounting instead, you need to opt out.

With accrual basis accounting, you record income and expenses when invoices are raised or bills received, regardless of when payment happens. For example, you would record an electricity bill as soon as you received it from the supplier, not when you pay it.

Cash basis is simpler for most sole traders, but accrual accounting gives a more complete view of what your business owns and owes at any given time. Speaking with an accountant can help you decide which method suits your situation. For a detailed comparison, read the guide on cash accounting versus accrual accounting.

3. Set up a business bank account

As a sole trader in the UK, you are not legally required to have a separate business bank account. However, having one makes accounting and bookkeeping far easier because you do not need to filter through personal transactions when reconciling your accounts.

A dedicated business account also gives you a clearer view of your cash position at a glance. There are plenty of small business accounts to choose from, and many offer free or low-cost tiers.

4. Record your income and expenses

Accurate record-keeping is the foundation of self-employed accounting. You can import bank statements into spreadsheets or accounting software and work through each transaction individually. Matching expenses with receipts is especially important, as HMRC may ask for proof of expenditure.

When tax time comes around, you can claim back certain business expenses known as "allowable expenses". These are deducted from your income before tax, so claiming the correct expenses ensures you pay the right amount. Read the guide on how to keep track of expenses for practical methods.

Checking your expenses regularly helps you keep costs down and ensures you claim the right amount of allowable expenses on your income tax return.

5. Calculate your self-employment tax

As a self-employed person, your income tax for the 2026/27 tax year is calculated on trading profits above the £12,570 personal allowance. You can check the current self-employment tax thresholds for full details.

Income tax rates for 2026/27 are:

• 20% on profits between £12,571 and £50,270 (basic rate)
• 40% on profits between £50,271 and £125,140 (higher rate)
• 45% on profits above £125,140 (additional rate)

If your taxable profits exceed £100,000, your personal allowance (£12,570) reduces by £1 for every £2 earned above that threshold.

You also need to pay Class 4 National Insurance contributions on your profits. The rates for 2026/27 are 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270. Class 2 NICs were abolished for most self-employed people from April 2024.

You can calculate your tax by subtracting allowable expenses from your total income and applying the relevant rate. Try HMRC's online estimating tool to help with tax planning, or read the guide on calculating your self-employed tax. Understanding your full tax obligations helps you avoid surprises at the end of the tax year.

6. Prepare your self assessment tax return

The deadline for filing your income tax self assessment is 31 January for online submissions and 31 October for paper submissions. You need your UTR number and basic details such as your business name and address. Read the guide on how to fill in a self assessment tax return online for step-by-step support, or see the full guide to sole trader self assessment.

Making Tax Digital for Income Tax is now live from April 2026 for self-employed people earning over £50,000. This means you need to keep digital records and submit quarterly updates to HMRC using compatible software. You can read more about the changes to self assessment tax returns under MTD.

7. Check if you need to register for VAT

Self-employed people with taxable turnover above £90,000 must register for VAT. This threshold has been in place since April 2024.

If your turnover exceeded £90,000 in the last 12 months, or you expect to exceed it in the next 30 days, you need to register. You must do so within 30 days of the month in which you crossed the threshold. Self-employed people can also register for VAT voluntarily. Read the guide on how to register for VAT for more information.

8. Consider using accounting software

Cloud accounting software can significantly reduce the time you spend on admin and equip you with the data to make smarter financial decisions. Features like live bank feeds and automated reconciliation mean you spend less time on manual data entry and more time running your business.

With Making Tax Digital now live, using MTD-compatible bookkeeping software is essential for self-employed people earning over £50,000. The right sole trader accounting software lets you prepare and submit tax returns directly from the platform, using records stored securely in the cloud.

Look for software that offers bank feeds, automated reconciliation, customisable reports, cash flow dashboards and MTD compatibility. Getting set up now means you are prepared for Making Tax Digital for self-employed people as the requirements expand.

Understanding allowable business expenses

Allowable business expenses are costs you can deduct from your income before calculating tax. Claiming the right expenses reduces your tax bill and ensures you only pay tax on your actual profit. You can find a detailed breakdown in the guide to self-employed allowable expenses.

Common claimable expenses include:

• Office costs such as stationery, phone bills and software subscriptions
• Travel costs including fuel, public transport and parking for business journeys
• Equipment and tools you need for your work
• Professional fees for accountants, solicitors or consultants
• Business insurance premiums
• Marketing and advertising costs
• A proportion of household costs if you work from home (heating, electricity, broadband)

Expenses you cannot claim include:

• Personal clothing (unless it is a uniform or protective equipment)
• Client entertainment or hospitality
• Fines or penalties
• Personal expenses such as groceries or gym memberships
• Commuting costs between your home and a permanent workplace

Keep receipts and records for every business expense. HMRC may ask for proof at any time, and missing documentation could mean you lose the deduction.

Common self-employed accounting mistakes

Even experienced sole traders can make accounting errors that lead to higher tax bills or compliance issues. Being aware of the most common mistakes helps you avoid them.

Common self-employed accounting mistakes include:

• Reconciling your accounts too infrequently, making it harder to identify and categorise transactions
• Not claiming the correct allowable expenses, so your tax bill is higher than it should be
• Failing to store receipts and evidence in a secure, accessible location
• Not setting aside money for your tax bill each month
• Missing the deadlines for income tax or VAT
• Not chasing late payments, leading to cash flow problems

Most of these mistakes can be avoided by attending to your bookkeeping regularly. Make sure you code transactions correctly so you can identify allowable expenses. Put the tax deadlines in your calendar so you do not miss them.

Follow up on late payments promptly so you do not miss out on income. If you use accounting software, you can set up automated late payment reminders or introduce late payment fees.

Managing cash flow as a self-employed person

Healthy cash flow is critical for any self-employed business. Even if your accounts show a profit, running out of cash to cover day-to-day expenses or tax bills can put your business at risk.

To manage your cash flow effectively:

• Invoice promptly and set clear payment terms so you receive income on time
• Monitor your receivables and follow up on overdue payments straight away
• Build an emergency fund covering at least three months of essential business expenses
• Set aside a percentage of each payment you receive (typically 25 to 30%) into a separate account for your tax bill
• Review your cash flow regularly using your accounting software dashboard or a simple spreadsheet

Planning ahead for large, predictable expenses such as tax payments on account, insurance renewals or equipment purchases helps you avoid cash shortfalls. If you use cloud accounting software with live bank feeds, you can see your cash position at a glance and spot potential problems early.

How long to keep self-employed accounts

You must keep your self-employed accounting records for at least five years after the 31 January submission deadline for the relevant tax year. HMRC can ask to see your records at any time during this period, so storing them safely is essential.

Records to keep include invoices, receipts, bank statements, mileage logs and any other evidence of income or expenses. Cloud accounting software makes storing and retrieving these records straightforward, as everything is backed up securely online.

Is it worth getting an accountant when you're self-employed?

Many self-employed people manage their own accounting successfully, especially with the right software in place. However, an accountant or bookkeeper can offer strategic expertise that goes beyond basic compliance.

You might benefit from professional help if you need to apply for a business loan, require support with a mortgage application, are starting to employ people, or want advice on paying tax to HMRC efficiently. An accountant can also help you identify allowable expenses you might otherwise miss. Read the guide on when to consider hiring an accountant for more on this.

Consider how much time you have to commit to your accounts. Bank reconciliation should be done regularly, and monthly is ideal. If you do not have the time or confidence to manage this yourself, professional support could save you money in the long run. The guide on how to choose an accountant can help you find the right fit.

Simplify self-employed accounting with Xero

Cloud accounting software makes self-employed accounting straightforward. Automate the admin, access reliable financial data in real time and submit tax returns directly from Xero's accounting software for self-employed people.

With live bank feeds, automated reconciliation, customisable reports and MTD compatibility built in, you can spend less time on the numbers and more time growing your business. Get one month free.

FAQs on self-employed accounting

Below are some frequently asked questions about self-employed accounting.

Do you need an accountant if you're self-employed?

You do not legally need an accountant if you are self-employed. Many sole traders manage their own accounts using cloud accounting software. However, an accountant can help with tax planning, identifying allowable expenses and handling complex situations such as VAT registration or employing staff.

What records must you keep when self-employed?

You must keep records of all income and expenses, including invoices, receipts, bank statements and mileage logs. HMRC requires you to retain these records for at least five years after the 31 January submission deadline for the relevant tax year.

What is Making Tax Digital for Income Tax?

Making Tax Digital for Income Tax requires self-employed people earning over £50,000 to keep digital records and submit quarterly updates to HMRC using compatible software. It is live from April 2026, with plans to extend to lower income thresholds in future years.

Can you do your own bookkeeping as a sole trader?

Yes, you can do your own bookkeeping as a sole trader. Using cloud accounting software with bank feeds and automated reconciliation makes the process faster and reduces errors. Regular bookkeeping, ideally monthly, keeps your records accurate and your tax return preparation straightforward.

What expenses can you claim when self-employed?

You can claim allowable business expenses such as office costs, travel, equipment, professional fees, insurance and a proportion of household costs if you work from home. Personal expenses, client entertainment and fines are not claimable. Keep receipts for all expenses as HMRC may request proof.