Cash basis vs traditional accounting for sole traders: which should you choose?

Cash basis and traditional accounting can produce different profit figures, especially when invoices are unpaid at the tax year end. The right method depends on how your business bills, pays costs, holds stock, and manages debt.

What cash basis means

Under cash basis accounting, income is usually counted when you receive payment, and expenses are counted when you pay them. This can feel intuitive for small sole traders because the tax figures follow bank movements more closely.

From 2024/25, cash basis became the default method for many unincorporated businesses, with traditional accounting available by election. Check the current rules if you have complex circumstances.

What traditional accounting means

Traditional accounting, sometimes called accruals accounting, records income when it is earned and expenses when they are incurred, even if payment happens later. If you invoice a client in March and they pay in May, traditional accounting may still include the income in the earlier tax year.

Who cash basis can suit

Small service businesses with simple bank transactions.
Sole traders who are paid quickly and have few unpaid invoices at year end.
Businesses with limited stock and simple expense patterns.
People who want tax records to follow cash flow more closely.

Who traditional accounting can suit

Businesses with significant stock or work in progress.
Sole traders with larger unpaid invoices or supplier bills at year end.
Businesses needing fuller profit reporting for lenders, investors, or tenders.
Anyone whose accountant recommends accruals for a clearer commercial picture.

Worked example

You invoice £5,000 on 25 March 2026 and receive payment on 20 April 2026. Under cash basis, that income may fall into 2026/27 because that is when the cash arrives. Under traditional accounting, it may be included in 2025/26 because that is when the work was billed or earned.

Interaction with Making Tax Digital

MTD is about digital records and reporting; it does not make every business use the same accounting method. But whichever method you use, your software and records need to categorise income and expenses consistently. Read our MTD quarterly updates guide if quarterly reporting is on your horizon.

Tax planning impact

Your accounting basis affects the profit figure used in Self Assessment. That profit then drives Income Tax, Class 4 National Insurance, payments on account, and cash-flow planning. Once you know the profit figure, use the self-employed tax calculator to estimate the bill.

Official source

GOV.UK explains cash basis here: Cash basis.