Cash Basis vs Accrual Accounting: Which Fits?

A job can be finished, invoiced and paid weeks apart. For a cab driver, subcontractor, landlord or small business owner, that gap matters. The choice between cash basis vs accrual accounting decides when income and costs appear in your records - and can affect the profit on which you pay tax.

Neither method is automatically better. Cash basis is often easier to run when money comes in and out regularly. Accrual accounting can give a clearer picture where invoices, supplier bills, stock or longer-term contracts are involved. The right answer depends on how your business operates, not just which method feels simplest at year end.

What is cash basis accounting?

Cash basis accounting records income when you receive payment and expenses when you actually pay them. If you complete work in March but the customer pays your invoice in April, the income generally falls into the next tax year. Equally, if you pay for materials, insurance or bookkeeping before your year end, you normally record the cost then.

For many sole traders, this mirrors the bank account and is much easier to follow. You are dealing with money that has genuinely moved, rather than trying to track every amount owed to or by the business.

From the 2024/25 tax year, cash basis became the default method for many unincorporated UK businesses and landlords, unless they choose to use traditional accounting. There are exceptions, so it is still sensible to check your own position, particularly if you trade through a partnership or have more complex arrangements.

Imagine a CIS subcontractor who is paid for work completed in late March on 10 April. Under cash basis, that payment is usually included in the tax year ending the following April. If they buy replacement tools and pay for them before 5 April, the expense is usually accounted for in the earlier year. The timing can make a noticeable difference to taxable profit from one year to the next.

The advantages of cash basis

The main benefit is practical control. Your accounting records are closer to your bank transactions, so it is easier to see what cash is available for wages, fuel, materials, tax and day-to-day bills. This can suit a self-employed person who is working long hours and does not want extra paperwork after a full day on site or on the road.

It can also help where customers pay slowly. You are not normally paying income tax on an invoice that remains unpaid at your year end. For a landlord dealing with late rent or a tradesperson waiting for a commercial client to settle, that can ease pressure on cash flow.

Cash basis can be straightforward for Making Tax Digital record keeping too, provided transactions are kept up to date and categorised properly. Simple does not mean careless, however. You still need invoices, receipts, mileage records and evidence for all claims.

Where cash basis can be less useful

A bank balance is not the same as business profit. You may have received a large deposit for future work, or paid an annual insurance premium in one go. Cash basis shows the payment when it moves, which may not reflect how profitable a particular month or contract really was.

It may also give less visibility over unpaid customer invoices and bills you still need to pay. If you rely on supplier credit, employ staff, hold stock, or manage several projects at once, you need a clear view of what is owed as well as what has cleared the bank.

The method can create tax timing opportunities, but it should not be treated as a last-minute way to move income around without planning. Delaying an invoice is rarely a sound business decision if it damages relationships or leaves you short of cash. It is also worth remembering that a timing difference is not always a permanent tax saving. It may simply move taxable profit into another year.

What is accrual accounting?

Accrual accounting, often called traditional accounting, records income when it is earned and expenses when they relate to the period - not necessarily when the money changes hands.

If you issue an invoice for work completed in March, it is included in that accounting period even if you are paid in May. If a supplier invoices you for materials used before year end but you pay after it, the cost is generally included in the earlier period. Your accounts may therefore include debtors, which are amounts customers owe you, and creditors, which are bills you owe.

This is the standard approach for limited company statutory accounts. A company director cannot simply switch company accounts to cash basis because it would be more convenient. Proper accounts need to reflect the company’s financial position at its year end, including unpaid invoices, outstanding costs, loans, stock where relevant and tax liabilities.

Why accrual accounting can be the better management tool

Accrual accounting is often more informative for a growing business. It matches the revenue from a job with the costs of doing it, giving a more realistic view of margins. That matters if you are pricing contracts, deciding whether to take on staff, applying for finance or checking whether a particular service is actually worthwhile.

Take a small construction firm that completes a £20,000 contract in March, with £11,000 of materials and subcontractor costs relating to that job. If the customer pays in May and some supplier bills are settled in April, cash basis could spread those amounts across two periods. Accrual accounting puts the income and related costs together, making the £9,000 gross margin easier to understand.

For landlords with multiple properties, accrual accounting may also make it easier to monitor rent arrears, agent fees and repair bills that relate to each property. It does not change the need to follow the specific tax rules for property income, including the restrictions that can apply to finance costs on residential lets.

The trade-off: more records and more judgement

Accrual accounting requires better bookkeeping discipline. You need to know the invoice date, what period work relates to and whether a bill has been received but not yet paid. At year end, there may be adjustments for prepayments, accrued expenses, bad debts and stock.

That extra work is worthwhile when it gives you information you can use. But for a sole trader with a modest number of transactions and no major unpaid balances, it can become admin for admin’s sake. The aim is to have records that help you run the business and meet HMRC requirements, not to build a complicated system you will not maintain.

Cash basis vs accrual accounting: the tax difference

The central difference is timing. Cash basis taxes money when it is received and allows costs when they are paid. Accrual accounting taxes income when it is earned and allows costs when they are incurred.

This can affect the tax bill for a particular year, especially where work straddles 5 April. It can also affect payments on account, which can catch self-employed people out if a stronger year pushes profits up. A method that lowers this year’s profit could result in more profit falling into the next year, so the wider tax position should be reviewed rather than looking at one return in isolation.

The accounting method does not turn non-allowable spending into an allowable expense. Private expenditure, client entertaining and ordinary clothing are still treated under the usual tax rules. Likewise, you need to consider separate rules for capital purchases, vehicles, home working and property finance costs.

VAT is another common source of confusion. Cash basis accounting for income tax is not the same as HMRC’s VAT Cash Accounting Scheme. A business may use one approach for its income tax records and have different VAT obligations. If you are VAT registered, choose and run the VAT scheme separately and keep digital VAT records where required.

How to choose the right method for your business

Start with the practical reality of your work. Cash basis is often a sensible fit if you are a sole trader or landlord, payments are fairly prompt, you want clear bank-led records and you do not need detailed job profitability reporting. It can work well for a self-employed driver, a local tradesperson or a contractor with a manageable flow of income and expenses.

Accrual accounting may be more suitable if you issue substantial invoices before being paid, receive long supplier credit, hold stock, work on larger contracts or need reliable management figures. It is generally necessary for limited companies preparing statutory accounts.

Changing method needs care because income and expenses must not be omitted or counted twice. The first year after a switch may need transition adjustments. It is not something to decide after the year end merely because one option appears to produce a lower tax bill.

Keep the records useful, not just compliant

Whichever method you use, make time each week or month to reconcile the bank, save receipts and chase missing paperwork. Keep business and personal spending separate where possible, and do not wait until January to work out what happened the previous April.

For clients who want a straightforward answer rather than an accounting lecture, Short And Sons Accountants can review the way the business earns, spends and invoices before recommending an approach. A good accounting method should make your tax position clearer, reduce avoidable admin and leave you more time to do the work that brings money through the door.