Cash vs. Accrual Accounting: Which Method to Choose and Why It Matters for Taxes

By Yarik Yarosh, CPA ·September 5, 2026 ·6 min read

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

The accounting method election is one of the most consequential decisions on a new business’s first tax return, and most business owners make it without realizing it. By reporting income on the cash basis (reporting income when received and expenses when paid) on the first return, the business has elected cash basis, and changing to accrual requires filing Form 3115 (Application for Change in Accounting Method) with IRS consent. For most small businesses (under $29 million in average annual gross receipts), the cash method is simpler, provides better cash flow matching (you don’t pay tax on money you haven’t received), and allows year-end timing flexibility (defer income by delaying invoices, accelerate deductions by prepaying expenses). Accrual basis is better for businesses with significant receivables, inventory-heavy operations, and those that need GAAP-compliant financials for lenders or investors.

✓Key takeaway

Cash vs. accrual comparison:

Factor	Cash Basis	Accrual Basis
Income recognition	When received	When earned (invoiced)
Expense recognition	When paid	When incurred (billed to you)
Simplicity	Simpler	More complex
Cash flow matching	Excellent (tax follows cash)	Poor (tax before cash)
Year-end planning	Flexible (timing of receipts/payments)	Limited
Bad debt deduction	No (income never reported)	Yes (income was reported, then uncollectible)
Financial statement accuracy	Lower (doesn’t match revenue to period earned)	Higher (GAAP-compliant)
Required for whom?	Available to most small businesses	Required if avg gross receipts > $29M

Who must use accrual:

Businesses with average annual gross receipts over $29 million (3-year average)
C-Corporations with average gross receipts over $29 million
Tax shelters (regardless of size)
Certain businesses with inventory (but the TCJA expanded cash-basis eligibility for inventory businesses under $29M)

Who can choose either:

Sole proprietors under $29M gross receipts
S-Corps under $29M gross receipts
Partnerships under $29M gross receipts
C-Corps under $29M gross receipts

Year-end planning advantages (cash basis):

Strategy	Action	Tax Impact
Defer income	Don’t send December invoices until January	Income shifts to next year
Accelerate expenses	Prepay January rent in December	Deduction in current year
Buy supplies early	Purchase January supplies in December	Deduction in current year
Delay collections	Don’t deposit December checks until January	Income shifts to next year

These strategies are NOT available on accrual basis (income is recognized when earned, regardless of when collected).

Form 3115 (changing methods):

Voluntary change: file Form 3115 with the return
Requires computing a Section 481(a) adjustment (the cumulative difference between the two methods)
Positive adjustment (more income on new method): spread over 4 years
Negative adjustment (less income on new method): take entirely in Year 1
The adjustment can be large for businesses with significant receivables or payables

How does the method choice affect taxes?

Hypothetical example

Round numbers. A plumbing contractor. Year-end analysis showing the difference between cash and accrual.

December 31 snapshot:

Item	Amount
Invoices sent but not collected (accounts receivable)	$18,000
Work completed, not yet invoiced	$5,000
Bills received but not paid (accounts payable)	$8,000
Supplies purchased on credit, not yet paid	$3,000

Income and expense recognition:

Item	Cash Basis	Accrual Basis
Accounts receivable ($18,000)	Not income (not received)	Income (earned and invoiced)
Unbilled work ($5,000)	Not income	Depends (usually income when invoiced, not completed)
Accounts payable ($8,000)	Not deducted (not paid)	Deducted (incurred)
Supplies on credit ($3,000)	Not deducted (not paid)	Deducted (incurred)

Year-end taxable income difference:

Method	Additional Income	Additional Deductions	Net Difference
Cash	$0	$0	$0
Accrual	+$18,000	+$11,000	+$7,000

Accrual basis produces $7,000 MORE taxable income in this year because receivables ($18,000) exceed payables ($11,000).

Tax on the $7,000 difference at 25%: $1,750 more in taxes under accrual.

Over a career, the methods tend to even out (the cash that was deferred in Year 1 is collected in Year 2). But the cash method provides a permanent timing advantage: the business always has at least one year’s worth of receivables that haven’t been taxed yet. For a contractor with consistent $18,000 in year-end receivables, this is a permanent $18,000 deferral, saving approximately $4,500 in tax (at 25%) that is never paid until the business closes.

Year-end timing strategies (cash basis only):

Strategy 1: Defer income

December 15: complete a $5,000 job
Send the invoice on January 2 instead of December 15
Result: $5,000 shifts to next year’s income
Tax savings: $5,000 x 25% = $1,250 deferred

Strategy 2: Accelerate expenses

January rent due: $2,000
Pay it on December 28 instead of January 1
Result: $2,000 additional deduction in current year
Tax savings: $2,000 x 25% = $500 moved to current year

Strategy 3: Stock up on supplies

Buy $3,000 in supplies on December 30 (PEX pipe, fittings, water heaters)
These would normally be purchased in January
Result: $3,000 additional deduction in current year
Tax savings: $3,000 x 25% = $750

Combined savings from year-end timing: $2,500 in shifted/accelerated deductions.

When accrual is actually better:

Bad debts: a contractor on accrual who can’t collect a $10,000 invoice gets a $10,000 bad debt deduction. A cash-basis contractor gets nothing (the income was never reported).
Loan applications: banks prefer accrual-basis financials because they show revenue more accurately. A cash-basis contractor who collected $200,000 but earned $240,000 (with $40,000 in receivables) looks less profitable than an accrual-basis contractor reporting $240,000.
Construction contracts: long-term contracts (over 12 months) may require the percentage-of-completion method (a form of accrual) under IRC 460. But the TCJA exempted small contractors (under $29M average receipts) from this requirement.

The “hybrid” approach: Some businesses use cash basis for tax purposes and accrual basis for internal management. This is perfectly legal. The tax return follows the elected method, but internal reports (for the owner, lenders, or investors) can use any method. QuickBooks can run reports on either basis from the same data.

Changing methods (Form 3115): A plumbing contractor who started on accrual and wants to switch to cash:

Year-end receivables: $18,000 Year-end payables: $11,000 Section 481(a) adjustment: ($7,000) (negative, more income on accrual than cash)

Negative adjustment: deduct the full $7,000 in Year 1 of the change. Tax savings from the switch: $7,000 x 25% = $1,750 (one-time benefit, plus ongoing cash-basis advantages).

If switching from cash to accrual: Section 481(a) adjustment: $7,000 (positive, more income on accrual) Spread over 4 years: $1,750/year in additional income Tax cost: $1,750 x 25% x 4 = $1,750 total (paid over 4 years)

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: Which Method to Choose and Why It Matters for Taxes." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-cash-vs-accrual-accounting-method-election

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