Two businesses can have the same year of transactions and report wildly different net incomes if one uses cash basis and the other uses accrual basis accounting. The dollars are identical — the timing is what differs. Cash basis records revenue and expense when cash moves. Accrual basis records them when the economic event happens, regardless of cash. The choice between the two changes which period a number lands in, and that is enough to change the whole story.
The Core Difference: When Does Something Get Recorded?
Under cash basis accounting, revenue is recorded when cash is received from a customer, and expense is recorded when cash is paid to a supplier or employee. It is essentially "track the bank account." Simple, intuitive, and very good for small operations that have no significant receivables, payables, or inventory.
Under accrual basis accounting, revenue is recorded when it is earned (the service is delivered or the product is sold), regardless of when the customer pays. Expense is recorded when it is incurred (the resource is used up), regardless of when it is paid. Cash moving is irrelevant to the entry — only the economic event matters.
The standard rules:
- Revenue recognition (accrual): Revenue is recognized when the seller has fulfilled its obligation to the customer — typically when the service is delivered or the goods transfer to the buyer.
- Matching principle (accrual): Expenses are matched against the revenues they helped produce, in the same period as those revenues.
Cash basis ignores both rules. It does not match expense to revenue; it matches expense to cash payment. That sounds reasonable until you see the distortion it creates over a year.
A Worked Example: Same Year, Two Different Stories
A consulting business called Northbridge has the following transactions in 2025.
- March: Pays $12,000 cash for an annual insurance policy covering March 2025 through February 2026.
- June: Performs $30,000 of consulting work and bills the client; the invoice is paid in July.
- November: Buys $4,000 of office supplies on credit; pays the supplier in January 2026. Of the supplies, $1,500 are used in 2025 and $2,500 remain on hand at year-end.
- December: Performs $20,000 of consulting work; the client pays $5,000 in December and the remaining $15,000 in February 2026.
What does 2025 look like under each method?
Cash basis: track what happened to the bank account
Revenue is recorded when cash arrives. Expense is recorded when cash leaves.
Cash basis revenue (2025):
- June work — paid in July → counts in 2025: $30,000
- December work — $5,000 received in December → counts in 2025: $5,000
- (The remaining $15,000 is collected in 2026 and counts then)
Total cash-basis revenue = $35,000
Cash basis expense (2025):
- March insurance payment (full $12,000 paid in 2025) → $12,000
- November supply purchase (paid in 2026) → $0 in 2025
Total cash-basis expense = $12,000
Cash basis net income (2025) = $35,000 − $12,000 = $23,000
Accrual basis: match the economic events to the period they belong to
Revenue is recorded when work is performed. Expense is recorded when resources are used.
Accrual basis revenue (2025):
- June work — performed in 2025 → $30,000 (regardless of when cash arrives)
- December work — performed in 2025 → $20,000 (regardless of when cash arrives)
Total accrual-basis revenue = $50,000
Accrual basis expense (2025):
- Insurance — 10 of the 12 months covered fall in 2025 → $12,000 × (10/12) = $10,000. The other $2,000 is a prepaid asset on the year-end balance sheet.
- Supplies — $1,500 used in 2025 → $1,500. The remaining $2,500 sit on the balance sheet as a supplies asset.
Total accrual-basis expense = $11,500
Accrual basis net income (2025) = $50,000 − $11,500 = $38,500
What the Gap Means
Same transactions. Cash basis says Northbridge earned $23,000. Accrual basis says $38,500. The $15,500 gap is split across the components:
- Cash basis missed the $15,000 of December work not yet collected; accrual basis captured it.
- Cash basis expensed the full $12,000 of insurance in March; accrual basis matched only the $10,000 covering 2025 and parked $2,000 as a prepaid asset.
- Cash basis ignored the November supply purchase (no cash moved in 2025); accrual basis expensed the $1,500 actually consumed and treated the rest as inventory.
The two methods eventually report the same total dollars across time — they just land in different years. The remaining $15,000 of consulting collected in 2026 will count as 2026 revenue under cash basis, even though the work happened in 2025. That timing difference is exactly why a bank looking at a one-year income statement gets a sharper read from the accrual figures.
When Each Method Is Used
Cash basis is used by very small businesses and sole proprietors. It is simple, cheap to maintain, and corresponds to "what is in the bank." The IRS allows small businesses below specific revenue thresholds to use cash basis for tax. It is not allowed under GAAP or IFRS for any company that issues financial statements to outsiders.
Accrual basis is required under GAAP and IFRS for any business that publishes financial statements, takes on outside investors, or seeks bank financing of any size. The revenue belongs in the period the work was done and expenses match — it is the basis underlying every other topic in financial accounting.
Getting Help
The accrual rules in this guide produce many of the adjusting entries that hit the books at period end. To see how those entries are recorded in standard form, see recording journal entries, and for what happens to the resulting balances when the period actually closes, see closing entries explained.
Conclusion
Accrual vs. cash basis accounting is purely a timing question. Cash basis records revenue and expense when cash moves; accrual basis records them when the economic event happens, often in a different period from the cash. Same transactions, same dollars eventually — but the accrual basis is what produces meaningful financial statements for any business larger than a one-person operation, and it is the basis required by GAAP and IFRS.
