Cash vs. Accrual Accounting for Tax: Which Method to Use and How to Switch (IRC 446/448)
The choice between cash and accrual accounting affects when income is taxed and when deductions are allowed, making it one of the most consequential tax decisions a business makes. Under IRC 446, the accounting method used for tax must clearly reflect income and be consistent with the method used for the business’s books and records. The Tax Cuts and Jobs Act of 2017 significantly expanded who can use the cash method by raising the gross receipts threshold from $5 million to $25 million (indexed for inflation: $31 million for 2025 and $32 million for 2026) under IRC 448(c). Businesses under this threshold can use the cash method regardless of entity type, whether they carry inventory, or whether they are in a service, manufacturing, or retail business. This was a major simplification that allowed many mid-size businesses to switch from accrual to cash, deferring significant amounts of income.
Cash vs. accrual method comparison:
| Feature | Cash Method | Accrual Method |
|---|---|---|
| Income recognition | When received (or constructively received) | When earned (all events test + economic performance) |
| Expense recognition | When paid | When incurred (all events test + economic performance) |
| Accounts receivable | Not income until cash received | Income when services performed / goods delivered |
| Accounts payable | Not deductible until paid | Deductible when liability established |
| Prepaid income | Taxable when received | May be deferred to the next tax year to the extent not earned (IRC 451(c)) |
| Prepaid expenses | Deductible when paid (12-month rule) | Deductible as the benefit is consumed |
| Tax timing advantage | Generally better (defer income, accelerate deductions) | Generally worse (income recognized before cash arrives) |
| Complexity | Simpler | More complex |
Who can use the cash method (IRC 448):
| Entity Type | Cash Method Allowed? |
|---|---|
| Sole proprietors | Yes at any size (IRC 448 doesn’t apply to them) |
| Partnerships without C-Corp partners | Yes at any size (IRC 448 doesn’t apply) |
| S-Corporations | Yes at any size (IRC 448 doesn’t apply) |
| C-Corporations and partnerships with a C-Corp partner | Yes, if average gross receipts are $32M or less (2026) |
| Tax shelters | No (must use accrual regardless of size) |
| C-Corp or partnership with a C-Corp partner over $32M average gross receipts (3-year average) | Must use accrual |
A business of any type that is over the threshold and keeps inventory still has to account for that inventory (the IRC 471(c) small business exception uses the same test).
Gross receipts test (IRC 448(c)), $32 million for 2026:
| Element | Rule |
|---|---|
| Test period | Average of prior 3 tax years |
| Includes | All gross receipts (sales, services, investment income, rents, royalties) |
| Aggregation | Must aggregate gross receipts of all related entities under common control |
| New businesses | Short tax years are annualized |
| Once exceeded | Must switch to accrual beginning in the year the test is failed |
| Indexed | $31 million for 2025 and $32 million for 2026 (adjusted annually for inflation) |
When should you use cash vs. accrual?
What triggers a required change in accounting method?
The IRS requires a change in accounting method when your current method doesn’t clearly reflect income (IRC 446), when your gross receipts exceed the threshold for using the cash method under IRC 448 ($32 million average for the prior 3 years, for tax years beginning in 2026), or when a new tax law mandates a different method. Voluntary changes (such as switching from cash to accrual to better match revenue and expenses) require filing Form 3115 with your tax return. Most accounting method changes require a Section 481(a) adjustment, which captures the cumulative difference between the old and new methods. A positive 481(a) adjustment (additional income) is spread over 4 years, while a negative adjustment (additional deduction) is taken entirely in the year of change. Changes made under the automatic consent procedures (Rev. Proc. 2015-13 for the procedures and Rev. Proc. 2025-23 for the list of automatic changes, or their successors) don’t need advance IRS approval but must follow detailed filing requirements.
Should I use cash basis or accrual basis accounting for my small business?
Cash basis records income when received and expenses when paid, making it simpler and giving you more control over timing. Accrual basis records income when earned and expenses when incurred, regardless of payment timing, providing a more accurate picture of profitability. The IRS requires accrual for businesses with inventory that have average annual gross receipts exceeding $32 million (for tax years beginning in 2026; $31 million for 2025). Below that threshold, you can choose either method. Most small service businesses use cash basis because of its simplicity and the ability to time income and deductions for tax planning. Once you choose a method, switching requires filing Form 3115 and may trigger a Section 481(a) adjustment that spreads the transition impact over four years.
How often should a small business reconcile its accounts?
Monthly reconciliation is the minimum standard for any business, but weekly reconciliation catches errors faster and makes month-end closing significantly easier. Bank reconciliation compares your accounting records to bank statements to identify timing differences (outstanding checks, deposits in transit) and errors (duplicate entries, missed transactions). Credit card reconciliation should happen monthly at minimum, matching each statement charge to a recorded transaction with the correct expense category and ensuring no unauthorized charges slipped through. Businesses with high transaction volume (retail, restaurants, e-commerce) benefit from daily point-of-sale reconciliation, which catches discrepancies before they compound into material misstatements at year-end.
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Yarik Yarosh, CPA. "Cash vs. Accrual Accounting for Tax: Which Method to Use and How to Switch (IRC 446/448)." Blue Cloud CPA, September 5, 2026, updated October 5, 2026. https://bluecloudcpa.com/guides/small-business-accounting-methods-cash-vs-accrual-irc-448
This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.