Cash Basis vs Accrual Accounting: Which Method Suits Your Business?

Ask two bookkeepers to record the same invoice and you may get two different answers. One notes it the day the customer pays, the other the day the job was done. Both are right. They are simply using different methods — cash basis or accruals — and that choice affects your reported profit, the timing of your tax bill and how much admin you take on each month. It is worth a few minutes of thought before your next year end.

Cash basis: follow the money

Cash basis does what it says. Income is recorded when it lands in your bank account, expenses when you pay them. A £2,000 invoice raised in March but settled in May belongs to May. A supplier bill paid in January belongs to January, even if the work was done back in November.

For many small business owners that feels closer to real life. Profit tends to track the bank balance, there are no debtors or creditors to reconcile, and nothing needs estimating. HMRC has moved cash basis towards being the default for many sole traders and most partnerships, having previously restricted it by turnover. Check the current rules for your trading year, or ask your accountant to confirm where you stand.

The catch is timing. Two large unpaid invoices at the year end can make a strong year look thin, then flatter the next one. Money owed to you and money you owe do not appear on the books at all, which makes chasing debt harder and cash flow forecasting blunter.

Take a plumber who finishes a £6,000 bathroom in late March and invoices the customer immediately. The customer pays in May. Under cash basis, that £6,000 is May income, not March income. If April brings a tax bill or a quiet patch, the bank balance tells a gloomy story even though the work was already won and completed. The same plumber can also forget which customers still owe money unless a separate spreadsheet is kept, because the accounting records themselves will not show a debtor.

Accrual accounting: match the work to the period

Accrual accounting records income when you earn it and costs when you incur them, whether or not cash has moved. That March job is March income. The November supplier work is a November cost, paid in January or not.

That gives a truer picture of trading performance. You can see debtors, creditors, prepayments, work in progress and stock, so you can answer the question "did we actually make money this quarter?" properly. It is also compulsory for limited companies, which must prepare accounts under generally accepted accounting practice, and it is what banks, investors and most buyers expect to see.

The trade-off is admin: raising and tracking invoices, matching supplier bills to periods, keeping a debtors list, posting journals for depreciation and stock. Done well, that is a few extra hours a month. Done badly, it is a scramble every year end.

An example makes the difference clear. A design agency completes a £12,000 project in December, invoices the client on 20 December and receives payment in February. Accruals puts £12,000 of income in December and shows a debtor of £12,000 on the balance sheet at 31 December. Cash basis puts nothing in December and £12,000 in February. If the agency is trying to judge December's performance, or apply for a loan in January, accruals gives the lender and the owner a far more useful set of numbers.

The two methods side by side

• Income: cash basis — when the customer pays; accruals — when the sale is made.
• Costs: cash basis — when you pay; accruals — when the cost is incurred.
• Profit: cash basis follows cash movement; accruals reflects trading performance.
• Debtors and creditors: invisible under cash basis, clearly listed under accruals.
• Stock and work in progress: usually expensed as paid under cash basis; valued and carried under accruals.
• Equipment: generally deducted when paid under cash basis, with cars a common exception; spread through capital allowances under accruals.
• Admin load: lighter on cash basis, heavier on accruals.
• Who can use it: cash basis for sole traders and most partnerships; accruals open to everyone and compulsory for limited companies.

Pros and cons of each

Cash basis

• Pros: simple records, no year-end estimates, profit closely tied to cash, easy to hand over to a bookkeeper.
• Cons: profit swings between years, no visibility of who owes what, more limited loss relief, and payment timing can be used — legitimately — to shift tax between years.

Accruals

• Pros: accurate profit, a full balance sheet, better for lending and planning, required if you incorporate.
• Cons: more bookkeeping and more discipline through the year, plus you may pay tax on profit before the cash arrives.

Which businesses suit which method

1. Sole traders with straightforward work — consultants, tradespeople, tutors and drivers who are paid on the day or within days. Cash basis keeps life simple.
2. Limited companies — no choice. Accruals, full stop.
3. Businesses with slow-paying customers — agencies and contractors on 60-day terms. Accruals stop a distorted profit figure and show exactly who owes what.
4. Stock-heavy or work-in-progress businesses — builders, manufacturers, retailers holding real inventory. Accruals value what you are sitting on.
5. Businesses planning to raise finance or sell — a clean accruals balance sheet, with debtors, creditors and stock clearly shown, is far easier for a bank or buyer to trust.
6. Seasonal traders — if most of your income arrives in a few months, accruals can smooth the picture and stop a single strong quarter from hiding a weak year.

Switching from one method to the other

Changing method is not simply a matter of flicking a switch in your software. If you move from cash basis to accruals, you usually need to bring in opening debtors, creditors and stock so the first accruals year starts from the right place. Moving the other way can create transitional adjustments too, and there are rules about when an election can be made and how long it lasts. For sole traders and most partnerships, cash basis is often the default, but a limited company cannot choose it. If you are unsure, ask your accountant to run the numbers both ways before you decide.

Tax is calculated on profit, not on your bank balance. Under cash basis those two figures sit closer together; under accruals they can drift apart for months at a time. Neither is wrong, but you need to know which one you are managing.

A quick decision checklist

• Are you a limited company? If yes, accruals is compulsory.
• Do customers pay slowly? If yes, accruals will show the money you are owed and give a more realistic profit figure.
• Do you hold stock or carry out long projects? If yes, accruals handles work in progress and inventory far better.
• Do you need a loan, investor or buyer? If yes, accruals is the language they expect.
• Do you want the lightest possible admin? If yes, cash basis may suit a simple, fast-paying business.
• Do you want to move tax between years? Cash basis can do that legitimately by timing payments and receipts, but it should never be the only reason for choosing a method.

Whichever method you use, the important thing is consistency and understanding. Cash basis can be perfectly adequate for a small, stable sole trade. Accruals costs more effort but pays back in clarity, especially once you have staff, stock, slow payers or plans to grow. Choose deliberately, review the choice as your business changes, and make sure your bookkeeping system is set up to match.

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