Cash vs Accrual Accounting

Two businesses can do exactly the same work and report very different profits in the same month — simply because they record their numbers differently. The reason is the choice between cash and accrual accounting, two methods that disagree about when money should count in your books. The distinction sounds dry, but it shapes how your business looks on paper and even when you pay tax. This guide explains both clearly and helps you decide which fits. This is general business information, not accounting or tax advice.

What the two methods are

At heart, this is a question of timing: at what moment does a sale or a cost actually count?

Cash accounting records income and expenses only when money physically moves. You count a sale when the customer pays you, and a cost when you actually pay it. If you raise an invoice today but are paid next month, the income lands in next month's books.

Accrual accounting records income when it is earned and costs when they are incurred, regardless of when cash changes hands. You count a sale when you deliver the work and raise the invoice, even if payment comes weeks later, and you count a bill when you receive it, not when you settle it.

So the same transaction can appear in different periods depending on the method. That single difference ripples through everything else.

A worked example

Imagine you finish a £2,000 project in March, invoice the client immediately, and they pay in April. You also receive a £500 supplier bill in March that you pay in April.

Under the cash basis, March looks quiet and April looks busy. Under the accrual basis, both the income and the cost sit in March, when the work and the obligation actually happened. Neither is wrong — they are answering slightly different questions. Cash asks "what is in the bank?", while accrual asks "what did the business actually do this month?"

The case for cash accounting

The cash basis has one overwhelming virtue: simplicity.

• It matches your bank account. Because you only record money in and out, your books track reality closely, with fewer adjustments.
• It is easy to maintain. There is no need to track who owes you or who you owe at period end; you just follow the money.
• It helps with cash flow awareness. Since it mirrors actual payments, it keeps you focused on the cash you genuinely have.

That focus on real money is valuable, because plenty of profitable-looking businesses run into trouble when cash arrives too slowly. Our guide to cash flow management explains why timing can matter more than profit on paper.

The trade-off is that the cash basis can paint a misleading picture of performance. A great month's work can look poor simply because the payments have not landed yet, and vice versa. It also handles things like stock, large equipment purchases and credit less neatly.

The case for accrual accounting

Accrual accounting takes more effort but tells a fuller story. It matches income to the costs that produced it, in the period the activity happened, which is why it is the standard for larger businesses and a requirement for most limited companies.

Its advantages include:

• A truer view of performance. Profit reflects what you actually did in a period, not the accident of when invoices were settled.
• Better matching. Revenue and the expenses behind it appear together, so margins make sense.
• A clearer financial position. It captures money owed to you and by you, giving a more complete picture for decisions and for outside parties such as lenders.

This is the basis on which key financial statements are built. If you want to see how the pieces fit together, our explainer on the profit and loss statement assumes this kind of matched, accrual view of the numbers, and understanding it also helps when you map out your business model.

The cost is complexity: you must track debtors and creditors, make period-end adjustments, and accept that your reported profit will not match your bank balance at any given moment.

Which should a small business use?

There is no universal answer, but a few principles help.

1. Size and structure matter. In the UK, the cash basis is aimed at smaller self-employed businesses, while limited companies generally prepare accounts on an accrual basis. Eligibility rules and turnover considerations apply, so the choice is not always open.
2. Complexity matters. A simple service business with few outstanding invoices may be perfectly served by the cash basis. A business carrying stock, offering credit or making large purchases usually benefits from accruals.
3. Your goals matter. If you need accounts that reassure lenders or investors, or you want a precise read on monthly performance, accrual accounting is more convincing.

Many sole traders and freelancers start on the cash basis for its ease and move to accruals as they grow. Crucially, the choice affects the timing of when income and expenses are recognised, which can influence taxable profit in a given period — so it is wise to get tax advice before deciding or switching. GOV.UK sets out the eligibility and mechanics of the cash basis in detail.

A few things to remember

• It is about timing, not honesty. Both methods record the same real transactions; they differ only on when those transactions count.
• The cash basis can flatter or mislead. A quiet-looking month may just mean payments are running late.
• Accruals need discipline. Tracking what you are owed and what you owe is essential for the method to work.
• You may not have a free choice. Business type and size can decide the matter for you, so check the rules before assuming.

The bottom line

Cash accounting records money only when it moves; accrual accounting records income and costs when they are earned or incurred. The cash basis is simpler and mirrors your bank balance, making it popular with small, straightforward businesses. The accrual basis is more work but gives a truer picture of performance and is standard for larger and limited companies. Understand the difference, check which you are eligible for, and pick the one that matches how your business actually runs.