Cash vs. Accrual Accounting for Small Businesses: Which Method to Use

By Yarik Yarosh, CPA ·September 5, 2026 ·5 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

The accounting method determines WHEN income and expenses are recognized for tax purposes. Under the cash method, income is recognized when received and expenses when paid. Under the accrual method, income is recognized when earned (regardless of payment) and expenses when incurred (regardless of payment). Most small businesses (those with average annual gross receipts of $30 million or less over the prior three years) can use the cash method under IRC 448, as expanded by the Tax Cuts and Jobs Act. The cash method is simpler, provides more control over the timing of income and deductions, and is almost always preferable for small businesses. Switching from accrual to cash (or vice versa) requires filing Form 3115 (Application for Change in Accounting Method).

✓Key takeaway

Cash vs. accrual accounting:

Cash method:

Income recognized when RECEIVED (cash, check, credit card payment hits the account)
Expenses recognized when PAID (when the check clears or the credit card is charged)
Simpler bookkeeping
Tax timing control: can defer income (delay billing) or accelerate deductions (prepay expenses) at year-end
Available to most small businesses (under $30M average gross receipts)

Accrual method:

Income recognized when EARNED (when service is performed or goods delivered, regardless of payment)
Expenses recognized when INCURRED (when the obligation arises, regardless of payment)
More complex bookkeeping (requires tracking accounts receivable and accounts payable)
Less tax timing control
Required for: C-Corps over $30M, tax shelters, certain businesses with inventory (over $30M)

Who MUST use accrual:

Businesses with average gross receipts over $30M (3-year average)
Tax shelters (regardless of size)
Certain farming corporations
Note: the $30M threshold was $5M before TCJA (2018). Most small businesses that were previously required to use accrual can now switch to cash.

Who can use cash (after TCJA):

ANY business (including those with inventory) with $30M or less in average gross receipts
This includes S-Corps, partnerships, LLCs, sole proprietors, and C-Corps (all under $30M)
Businesses with inventory can treat inventory as non-incidental materials and supplies (deduct when used or sold)

Advantages of cash method for tax planning:

Year-end income deferral: stop billing in late December, collect in January (pushes income to next year)
Year-end expense acceleration: prepay January rent in December, buy supplies in December
Simpler: no need to track receivables or payables for tax purposes
Cash flow alignment: tax matches actual cash in and out

Advantages of accrual method:

Better financial picture: shows revenue when earned, regardless of collection
Required by lenders: some banks require accrual-basis financial statements for loans
GAAP compliance: generally accepted accounting principles prefer accrual
Long-term contracts: percentage-of-completion method requires accrual basis

How does the choice of method affect taxes?

Hypothetical example

Round numbers. A consulting firm (S-Corp) with $500,000 in annual revenue. December billing: $60,000 sent out on December 20. Clients pay in January. Year-end expenses: $5,000 in office supplies purchased and received in December, paid in January.

Under cash method:

December revenue: $0 (invoices sent but not paid)
December expenses: $0 (supplies received but not paid)
The $60,000 in revenue is recognized in JANUARY (next year)
The $5,000 in expenses is recognized in JANUARY (next year)
Net effect: $60,000 in income pushed to next year, $5,000 in deductions also pushed
Net deferral: $55,000 in income deferred to next year
Tax savings from deferral: $55,000 x 30% = $16,500 in cash flow benefit (taxes paid one year later)

Under accrual method:

December revenue: $60,000 (earned when services performed, regardless of payment)
December expenses: $5,000 (incurred when supplies received, regardless of payment)
The $60,000 is taxable THIS year, even though the cash arrives in January
No deferral available

Year-end tax planning under cash method:

Strategy	Amount	Tax Savings
Delay billing (collect in January)	$60,000 deferred	$18,000 deferred
Prepay January rent	$5,000 accelerated	$1,500 saved
Buy supplies/equipment before Dec 31	$10,000 accelerated	$3,000 saved
Prepay insurance (12-month rule)	$6,000 accelerated	$1,800 saved
Total	$81,000 shift	$24,300 in timing benefit

Note: this doesn’t eliminate tax. It pushes $55,000 in income (net) to next year. If the business is growing, next year’s tax rate may be the same or higher. The benefit is the time value of money (keeping $16,500 for an extra year) and potentially income smoothing.

The 12-month prepayment rule: Under the cash method, a prepaid expense is deductible in the current year ONLY IF the benefit period doesn’t extend beyond 12 months from the date of payment (or the end of the next tax year, whichever is earlier).

Prepay 6 months of rent in December: deductible (benefit period = 6 months)
Prepay 12 months of insurance in December: deductible (benefit period = 12 months)
Prepay 18 months of insurance: NOT fully deductible. Must capitalize the portion beyond 12 months.

Switching from accrual to cash (Form 3115): If a business currently uses accrual and qualifies for cash (under $30M):

File Form 3115 with the tax return for the year of change
This is an automatic change (no IRS approval needed, just notification)
A Section 481(a) adjustment captures the difference between accrual and cash basis
If the adjustment is NEGATIVE (more income under accrual than cash): take the full adjustment in the year of change (one-time deduction)
If POSITIVE (more income under cash): spread over 4 years

Example:

Accrual basis accounts receivable: $80,000 (income already recognized, not yet collected)
Accrual basis accounts payable: $30,000 (expenses already recognized, not yet paid)
481(a) adjustment: ($80,000) + $30,000 = ($50,000)
This is a NEGATIVE adjustment: the business gets a $50,000 deduction in the year of change
Tax savings: $50,000 x 30% = $15,000 (one-time benefit)
Going forward, the business operates on cash basis with simpler record-keeping and more tax timing control

Bottom line: almost every small business under $30M should use the cash method. The simplicity and tax timing control are significant advantages. The only exceptions are businesses required by lenders to maintain accrual-basis financials (they can keep two sets of books: accrual for the bank, cash for taxes) or businesses with complex long-term contracts.

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "Cash vs. Accrual Accounting for Small Businesses: Which Method to Use." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-accounting-method-cash-vs-accrual

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.