Accounting
Cash Basis Accounting
An accounting method that records revenue when cash arrives and expenses when cash leaves. The simplest method, the default for many small businesses, and often the right choice below meaningful complexity.
Cash basis is the simplest accounting method. It matches what's actually in the bank account closely, but distorts month-to-month profitability when receivables, payables, or inventory are meaningful.
Most small businesses start on cash basis for simplicity. Switching to accrual happens via Form 3115 with a §481(a) adjustment.
Where cash basis actually fits: solo consultants and freelancers who bill on completion; simple service businesses with no receivables carrying over month-end; sole proprietors below meaningful inventory. In these cases cash books are HONEST — they match reality closely, and imposing accrual accounts adds work without adding decision-relevant information.
Where cash basis actively misleads: any business with meaningful A/R, deferred revenue, inventory, or long-cycle billing. A restaurant with $200k of inventory looks radically different on cash vs accrual for the year it grew inventory. A SaaS business collecting an annual prepayment recognizes 12 months of revenue in the month of the sale. A construction business with a 6-month project runs peak cash out in month 1 and revenue in month 6 — cash-basis books say the business is losing money for 5 months and printing money in month 6.
The tax rules are the sharpest constraint. IRC §448 forces accrual for most C-corps and partnerships with C-corp partners above the small-business threshold (~$30M gross receipts, indexed). §471 requires accrual for inventory unless the taxpayer qualifies under §471(c). Once these thresholds are crossed, switching mid-year is not an option — file Form 3115 well ahead of the change date.
Common pitfalls
- Using cash basis for a business with meaningful inventory — the P&L stops matching reality
- Assuming cash-basis owners don't need to track receivables — collections still matter for cash flow even if not for revenue recognition
- Missing the transition to accrual when crossing IRS thresholds — filing Form 3115 late or after audit is more expensive than proactive conversion
- Presenting cash-basis financials to a lender or investor without a signal — most lenders assume accrual
- Confusing cash basis with modified cash basis; the modified variant capitalizes fixed assets (which pure cash does not) and is common in small-business practice
Related service
See accounting servicesHave a Cash Basis Accounting situation in your business?
Monthly close, accrual-basis financials, and a ledger that holds up when a lender, a buyer, or an examiner asks to see it.