You finish a project in December and invoice it. The client pays in January. Which year did you earn that money in? Your accounting method is the rule that answers this question — and the two common answers give genuinely different pictures of the same business.
Under cash accounting, the income belongs to January, when the money arrived. Under accrual accounting, it belongs to December, when you earned it and invoiced it. Neither answer is wrong; they measure different things, and the choice affects your bookkeeping workload, your tax timing, and how honest your reports are about where the business stands.
The cash method: count it when the money moves
Cash-basis accounting records income when payment is received and expenses when they are paid. Nothing exists in the books until money moves. An unpaid invoice, on a pure cash basis, is not income yet — it is just a hope with a due date.
The appeal is simplicity: your books track your bank account, and the question "how much did I make?" has the same answer as "how much came in?". This is why most freelancers and many small service businesses start — and often stay — on the cash basis.
The blind spot is equally simple: the cash method cannot see money you are owed or bills you have not yet paid. A December of heavy invoicing and zero collections looks like a terrible month, while spending January’s incoming payments looks like a great one — the exact reverse of what actually happened.
The accrual method: count it when it is earned
Accrual-basis accounting records income when it is earned — typically when you deliver the work and issue the invoice — and expenses when they are incurred, regardless of when cash moves in either direction. Issuing an invoice creates revenue and an account receivable on the spot; the later payment just converts the receivable into cash.
This is the method behind the matching principle: revenues and the expenses that produced them land in the same period, so each month’s profit means something. It is also what accounting standards such as GAAP require, which is why growing companies, and any business seeking serious financing or an audit, end up on accrual.
The cost is bookkeeping overhead. Accrual books track things the bank statement cannot show — receivables, payables, work billed but not collected — which in practice means double-entry bookkeeping and software rather than a spreadsheet of deposits.
Side by side
The same December invoice, paid in January, illustrates every difference that matters:
| Cash basis | Accrual basis | |
|---|---|---|
| Income counted when | Payment is received | Work is delivered and invoiced |
| Expenses counted when | You pay them | You incur them |
| Unpaid invoice is… | Nothing yet | Revenue + an account receivable |
| Tracks AR/AP | No | Yes |
| Bookkeeping effort | Low | Higher — double-entry in practice |
| Cash position visibility | Excellent | Needs a separate cash-flow view |
| Profit picture | Distorted by payment timing | Matched to when value was created |
Which method can you use?
Eligibility is set by national tax rules, not by preference alone. In the United States, the IRS describes both methods in Publication 538: most individuals and many small businesses may use the cash method, but businesses over certain revenue thresholds — and, with exceptions, those carrying inventory — are required onto accrual for tax purposes. Other countries draw their own lines, and many small businesses legitimately keep cash-basis books while their accountant handles the tax presentation.
Consistency is the rule everywhere: you pick a method, apply it to the whole year, and changing methods requires following your tax authority’s change procedure rather than simply deciding differently in March.
A practical middle path is common: run your formal books on one basis, but watch both views. Accrual tells you whether the business is profitable; a cash view tells you whether you can make payroll on Friday. Good software shows both from the same data.
What this means for your invoicing
On either method, the invoice is the anchor document — the difference is what it triggers. On accrual, issuing it is the revenue event, which makes invoice dates genuinely consequential: December 31st versus January 2nd moves income between tax years. On cash, the payment date rules, which makes collection speed the lever that moves your tax picture.
Either way, an accurate, dated, numbered invoice trail is what makes the method defensible. The method decides when income counts; the invoices prove what and when.
Common Mistakes
Reading cash-basis profit as performance
A strong collections month is not a strong sales month. On cash basis, always ask what invoicing looked like — the bank balance is telling you about the past.
Running accrual books and forgetting cash
Accrual profit includes money nobody has paid you yet. Businesses go under while profitable; keep a cash-flow view next to the P&L.
Switching methods informally
Moving between cash and accrual is a formal change with tax-authority procedure attached (in the US, an IRS change-of-method filing). Deciding mid-year to "just count it differently" creates books no one can defend.
Mixing methods inconsistently
Counting income on cash but expenses on accrual (or vice versa) when it flatters the numbers produces reports that mean nothing. Whatever combination you adopt must be consistent, period after period.
Frequently Asked Questions
Which method is better for a freelancer?
Most freelancers start on cash basis: it is simpler, matches how you think about money, and is usually permitted at freelance scale. Consider accrual when unpaid invoices routinely represent a meaningful share of your income, when you carry inventory, or when growth pushes you toward thresholds where the choice stops being yours.
Do unpaid invoices count as income?
On accrual: yes — invoicing is the income event, and the unpaid amount sits in accounts receivable. On cash basis: no — income appears only when payment arrives.
Can I switch from cash to accrual later?
Yes, and growing businesses commonly do. It is a formal accounting-method change: in the US it involves filing for IRS consent, and other countries have their own procedures. Plan the switch at a year boundary with an accountant rather than improvising it.
Does my accounting method change what I put on invoices?
No. The invoice carries the same fields either way — dates, amounts, terms, tax. What changes is when your books recognise it: at issue (accrual) or at payment (cash).
Sources & Further Reading
- Publication 538: Accounting Periods and Methods — Internal Revenue Service
- Cash vs. accrual accounting: tax and IRS impact — Sorren
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