What it means
Under the cash method the bank statement drives the tax return. An invoice raised on 20 December but paid on 8 January belongs in the second year, and a bill received in November but settled in February is deducted in the later year.
For a small business this is a genuine simplification. There is no need to track receivables and payables for tax purposes, and the business is never taxed on revenue it has invoiced but not yet collected, which protects cash flow when customers pay slowly.
It also gives a degree of timing control at the year end. Delaying an invoice or bringing forward a supplier payment shifts income between tax years, which is legitimate planning provided the transactions are real and the payments genuinely made.
Eligibility is the catch. Tax authorities restrict the method by size, usually through a gross receipts test, and often exclude businesses that hold significant inventory or operate as larger corporations, so a growing company can be forced onto accrual accounting mid-life.
The most important nuance is that cash basis for tax does not have to mean cash basis for everything else. Lenders, investors and accounting standards usually expect accrual figures, so many businesses keep accrual books for management and convert to cash basis only when preparing the tax computation.
In practice
Real-world examples.
Example
A landscaping company finishes a $60,000 commercial contract in late December and, being on the cash basis, sends the invoice on 2 January. The income falls into the next tax year, and the crew is paid in December so the wage cost is deducted in the earlier year.
Example
A single practitioner architect prepays $18,000 of office rent and professional indemnity insurance in December for the following year. Because payment has genuinely been made, the deduction lands in the current year and saves $18,000 x 25% = $4,500 of tax at her marginal rate.
Example
A food distributor grows past the gross receipts threshold and must move to accrual accounting. The change forces it to bring uncollected invoices into taxable income for the first time, producing a one-off catch-up adjustment that the finance team spreads over several years under the transition rules.
Formula
Calculation
Cash basis taxable income = Cash received in the year - Deductible cash paid in the year
A consultancy invoices $500,000 during the year but collects only $430,000, with $70,000 still outstanding at 31 December. It incurs $180,000 of deductible expenses but has actually paid $160,000, leaving $20,000 unpaid at the year end.
Cash basis taxable income = $430,000 - $160,000 = $270,000.
Accrual basis taxable income = $500,000 - $180,000 = $320,000.
The difference is $320,000 - $270,000 = $50,000 of income pushed into the following year. At a 25% tax rate that defers $50,000 x 25% = $12,500 of tax by twelve months. The tax is not avoided, only delayed, and it reverses when those receivables are collected, so a business that grows steadily keeps the benefit while one that shrinks pays it back.Case study
Seen in the real world.
The following is an illustrative and entirely fictional example. Larkspur Design Studio, an invented branding agency, completed its first full trading year having collected $840,000 from clients and paid $520,000 of deductible costs, giving cash basis taxable income of $840,000 - $520,000 = $320,000.
Its accrual position looked very different. The fictional studio still had $210,000 of unpaid client invoices and $60,000 of unpaid supplier bills, so on an accrual basis revenue would have been $840,000 + $210,000 = $1,050,000 and expenses $520,000 + $60,000 = $580,000, giving income of $470,000. The cash method therefore deferred $470,000 - $320,000 = $150,000 of income, worth $150,000 x 24% = $36,000 of tax at the owner's rate.
The founder made two decisions on the back of it. She kept accrual management accounts so that the bank could see the real trading picture when she applied for a facility, and she set aside the $36,000 rather than spending it, on the understanding that the deferral would unwind the moment growth flattened.
Watch out
Common mistakes.
- Believing that unpaid invoices reduce the tax bill, when under the cash method they simply are not counted until the money arrives.
- Writing a cheque on 31 December, posting it in January and claiming the deduction in the earlier year, when the timing rules turn on when payment is genuinely made.
- Using cash basis figures to judge how the business is performing, which flatters a month when a big receipt lands and understates a month spent building work in progress.
Questions
People also ask.
Who can use the cash basis?
Generally smaller businesses, sole traders and professionals below a gross receipts threshold, with common exclusions for larger corporations and businesses holding substantial inventory.
Does the cash basis save tax or just delay it?
It defers rather than saves, because income excluded this year is taxed when collected, although a growing business can hold that deferral almost indefinitely.
Can a business keep accrual books and file on the cash basis?
Yes, and most do, preparing accrual accounts for management and lenders and converting to cash basis in the tax computation.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%