What Is the Cash Basis for Sole Traders?

The cash basis is a simplified accounting method. You record income when it arrives in your bank account and expenses when you pay them. Not when you issue an invoice or receive a bill.

For example, you invoice a client for £2,000 on 25 March 2025. They pay you on 10 April 2025. Under the cash basis, that £2,000 counts as income in the 2025/26 tax year, not 2024/25.

HMRC introduced the cash basis specifically to make self-assessment easier for sole traders and small unincorporated businesses. It mirrors how most people naturally think about their money. If the cash is in your account, it is income. If it has left your account, it is an expense.

What Is Accruals Accounting for Sole Traders?

Accruals accounting is the traditional method. You record income when you invoice the client and expenses when you receive the bill, regardless of when the money moves.

Using the same example: you invoice the client for £2,000 on 25 March 2025. Under accruals, that £2,000 is income for the 2024/25 tax year even though the client pays you in April 2025.

Accruals accounting gives a truer picture of your business performance in any given period. It matches income to the work done and expenses to the period they relate to. But it requires more careful record-keeping and often involves tracking debtors (money owed to you) and creditors (money you owe).

Cash Basis vs Accruals Sole Trader: The Key Differences

The core difference between cash basis and accruals for a sole trader is timing. Cash basis follows the cash flow. Accruals follows the transaction event.

Here is a direct comparison using a typical scenario for a freelance consultant in Manchester's Northern Quarter:

  • You invoice £5,000 on 28 March 2025. The client pays on 12 April 2025.
  • Cash basis: income counts in 2025/26 (when the money arrives).
  • Accruals basis: income counts in 2024/25 (when you issued the invoice).
  • You receive a £1,200 software licence bill dated 1 April 2025. You pay it on 20 April 2025.
  • Cash basis: expense counts in 2025/26 (when you pay).
  • Accruals basis: expense counts in 2024/25 (when the bill relates).

This timing difference can push your taxable profit into a different tax year. That matters if your income fluctuates year to year or if you are close to a tax band threshold.

Which Sole Traders Can Use the Cash Basis?

HMRC allows sole traders and partnerships (where all partners are individuals) to use the cash basis if they meet the conditions. From the 2024/25 tax year onwards, the turnover threshold for mandatory cash basis use was removed. You can choose either method if your turnover is under £150,000.

If your turnover exceeds £150,000, you must use accruals accounting. That threshold applies to your annual turnover, not your profit.

Some businesses cannot use the cash basis at all. You must use accruals if:

  • You are a limited company (limited companies always use accruals).
  • You are a limited liability partnership (LLP).
  • You are a partnership with a corporate partner.
  • Your business is a Lloyd's underwriter.
  • You previously used accruals and had turnover above the threshold.

If you are unsure whether you qualify, check your turnover for the last 12 months. If it is under £150,000 and you are a sole trader, you can use the cash basis.

When the Cash Basis Saves You Tax

The cash basis can be genuinely tax-efficient in specific situations. The most common is when your clients pay you late.

Imagine you are a sole trader running a building consultancy in Birmingham's Jewellery Quarter. You do £80,000 of work in March 2025. Your clients pay you in May and June 2025. Under the cash basis, that £80,000 falls into the 2025/26 tax year. Under accruals, it falls into 2024/25.

If your profit in 2024/25 was already high, the cash basis defers the tax liability by a full year. You pay the tax 12 months later than you would under accruals.

The cash basis also simplifies record-keeping. You do not need to track trade debtors or creditors on your self-assessment return. You report what hit your bank account and what left it. For many sole traders, that is significantly easier.

When Accruals Accounting Is Better

Accruals accounting gives a more accurate picture of your business's financial health. If you have significant work in progress, unpaid invoices, or prepaid expenses, the cash basis can distort your true profit.

Consider a freelance web developer in Leeds city centre. She invoices £30,000 in March 2025 for a project completed in February. Her clients pay in April 2025. Under the cash basis, her 2024/25 profit looks artificially low. Under accruals, it reflects the work actually done in that year.

Banks and lenders typically want to see accruals accounts. If you plan to apply for a mortgage or a business loan, the cash basis accounts may not give the lender confidence. They want to see a full picture of your debtors, creditors, and work in progress.

Accruals is also mandatory if you are VAT registered and using the standard VAT accounting scheme. The flat rate scheme and cash accounting scheme for VAT are separate from the income tax cash basis, but it is worth knowing the interaction.

How to Switch Between Cash Basis and Accruals

You can switch from cash basis to accruals or vice versa. HMRC allows it, but there are rules.

If you switch from cash to accruals, you must make an adjustment to avoid double-counting income or missing expenses. The adjustment typically involves bringing in any outstanding debtors and creditors at the point of switch. HMRC provides guidance on the computational adjustments in the Business Income Manual (BIM70000 series).

If you switch from accruals to cash, the adjustment works in reverse. You remove debtors and creditors from your accounts and only recognise income and expenses when cash moves.

In practice, most sole traders choose one method and stick with it. Switching is possible but adds complexity to your self-assessment return. If your circumstances change significantly, for example your turnover crosses the £150,000 threshold, you may have no choice.

Record-Keeping Requirements for Each Method

The cash basis requires less detailed record-keeping. You need to track:

  • All income received (date, amount, source).
  • All expenses paid (date, amount, category, receipt).
  • Bank statements covering the full tax year.

Accruals requires more. You need to track:

  • All invoices issued (date, amount, client, payment status).
  • All bills received (date, amount, supplier, payment status).
  • Debtors (unpaid invoices at year end).
  • Creditors (unpaid bills at year end).
  • Prepayments (expenses paid in advance).
  • Accruals (expenses incurred but not yet billed).

If you use accounting software like Xero, FreeAgent, or QuickBooks, the software handles most of this automatically. Xero and FreeAgent default to accruals accounting. You can still report on the cash basis for your tax return by running a cash basis report. But the underlying double-entry is accruals.

For sole traders using spreadsheets, the cash basis is far simpler. You can run a simple cashbook in Excel or Google Sheets and report directly from it. That is one reason many sole traders prefer the cash basis.

How the Cash Basis Affects Capital Allowances

Under the cash basis, you cannot claim capital allowances on most assets. Instead, you deduct the full cost of plant and machinery (equipment, tools, computers, vehicles) as an expense in the year you pay for them.

That is simpler but can distort your profit in the year of a large purchase. If you buy a van for £25,000, under the cash basis you deduct the full £25,000 in that year. Under accruals, you would claim capital allowances (typically 18% or 6% per year on a reducing balance basis) and spread the deduction over several years.

There are exceptions. Cars are treated differently under the cash basis. You can only deduct the business proportion of motoring costs using HMRC's approved mileage rates (45p per mile for the first 10,000 miles, 25p thereafter). You cannot deduct the full cost of a car under the cash basis.

If you use the cash basis and buy a car, you claim mileage rather than capital allowances. That is often simpler but may be less generous if you do high mileage.

Making Tax Digital and the Cash Basis

Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) is mandatory from April 2026 for sole traders and landlords with qualifying income over £50,000. From April 2027, it applies to those with income over £30,000. From April 2028, it applies to those with income over £20,000.

MTD for ITSA requires you to keep digital records and submit quarterly updates to HMRC. You can use either the cash basis or accruals basis under MTD. The choice is yours, provided you meet the eligibility rules.

However, the quarterly updates under MTD may push more sole traders toward accruals accounting. The quarterly updates require you to report income and expenses for that specific quarter. If you use the cash basis and a client pays you late, your quarterly update for that period may show lower income than the work you actually did. That is fine for HMRC, but it means your quarterly updates will not match your business performance in real time.

Accruals accounting under MTD gives quarterly updates that reflect work done, not cash received. For businesses with significant timing differences between invoicing and payment, accruals may produce more meaningful quarterly data.

Our bookkeeping and compliance team can help you choose the right approach for MTD.

Which Method Should You Choose?

There is no single right answer. The choice depends on your business type, your turnover, your record-keeping preferences, and your plans for growth.

Choose the cash basis if:

  • Your turnover is under £150,000.
  • Your clients typically pay you within a few weeks of invoicing.
  • You want the simplest possible record-keeping.
  • You do not need to apply for business loans or mortgages based on your accounts.
  • You have irregular income and want to defer tax on late-paying clients.

Choose accruals if:

  • Your turnover exceeds £150,000.
  • You need accurate monthly or quarterly management accounts.
  • You plan to apply for finance.
  • You have significant work in progress or prepaid expenses.
  • You want a true picture of your business's financial performance.

Many sole traders start on the cash basis and switch to accruals as their business grows. That is a sensible approach. The cash basis keeps your tax return simple in the early years. Once your turnover approaches £150,000 or you need better financial data, you switch.

As ICAEW qualified accountants, we see both methods used successfully across every sector. A freelance graphic designer in Shoreditch may prefer the cash basis for its simplicity. A management consultant in Canary Wharf with six-figure invoices may need accruals for accurate financial reporting. Both are valid.

If you are unsure which method suits your business, speak to an accountant. The choice affects your tax liability, your record-keeping burden, and your financial visibility. It is worth getting right.

Contact our team for a discussion about your specific situation. We work with sole traders across the UK, from Glasgow's Merchant City to Bristol's Harbourside. We will help you choose the method that fits your business.