Cash basis accounting records income when money reaches you and expenses when money leaves you. Nothing hits the books until cash actually moves. For tax years beginning in 2026, a business with average annual gross receipts of $32 million or less over the prior three years can generally use this method for federal tax purposes.1Internal Revenue Service. Rev. Proc. 2025-32 Its appeal is simple: your books track your bank balance, and the paperwork stays light enough that many sole proprietors and small service businesses handle it without dedicated accounting staff.
How the Timing Works
Under the cash method, revenue exists on your books only when cash or a cash equivalent arrives. Finish a $20,000 consulting project in November and invoice the client that week, but if payment doesn’t land until January, that income belongs to the following tax year. The date you earned the fee doesn’t matter. The date the money arrives does.
Expenses work the same way in reverse. You record a cost when you actually pay it, not when the bill shows up. A vendor invoice dated October 15 that you pay on December 30 is a December expense. Pay it on January 3 instead and it shifts into the next tax year. Cash leaving your account triggers the deduction.2Internal Revenue Service. Publication 538, Accounting Periods and Methods
Constructive Receipt: When the IRS Says You Already Got Paid
Cash-basis taxpayers sometimes assume they control exactly when income lands on their return by choosing when to deposit a check. The IRS disagrees. Under the constructive receipt doctrine, income counts as received the moment it’s made available to you without substantial restrictions, whether or not you take possession.
The classic example: a client hands you a check on December 31, you toss it in a drawer, and you don’t deposit it until January 5. That income still belongs to December’s tax year because you had immediate control the moment you held the check. The same rule applies to interest credited to your bank account or payments held at your request. You can’t defer income just by leaving accessible money sitting somewhere.
This catches people off guard. Delaying an invoice is fine, since the client hasn’t paid yet and there’s nothing to recognize. But once a payment is available and you simply choose not to collect it, the IRS treats it as received. The line between “hasn’t been paid” and “paid but I haven’t grabbed it yet” is where mistakes happen.
Credit Card Charges and Prepaid Expenses
Credit Card Charges Count on the Swipe Date
Credit cards are one place the cash method doesn’t behave the way people expect. When you use a business credit card to buy supplies, the IRS treats the expense as paid on the date of the charge, not the date you pay the credit card bill. The reasoning is that the card issuer paid the vendor on your behalf at the point of sale, creating a new debt between you and the issuer. The original expense is settled when you swipe.
This matters at year-end. Charge $5,000 in office equipment on December 28 but don’t pay the statement until February, and the $5,000 still falls in December’s tax year. It’s a useful lever for accelerating deductions, and a surprise for business owners who assumed the expense wouldn’t count until the bill was paid.
The 12-Month Rule for Prepaid Expenses
Cash-basis taxpayers sometimes try to front-load deductions by prepaying rent, insurance, or service contracts before year-end. The 12-month rule lets you deduct a prepaid expense in the current year only if the benefit doesn’t extend beyond the earlier of 12 months after the benefit begins or the end of the following tax year.2Internal Revenue Service. Publication 538, Accounting Periods and Methods
Paying a full year of office rent on December 1 for a lease running December through November qualifies, because the benefit period is exactly 12 months and doesn’t reach past the end of the next tax year. Prepaying a three-year insurance policy in December doesn’t. You’d deduct only the portion covering the current year and spread the rest across the remaining policy years.
Who Can Use the Cash Method
The IRS doesn’t let every business use cash-basis accounting. Eligibility depends mostly on entity type and revenue.
The Gross Receipts Test
For tax years beginning in 2026, a business qualifies if its average annual gross receipts over the three preceding tax years do not exceed $32 million.1Internal Revenue Service. Rev. Proc. 2025-32 The threshold is adjusted for inflation each year. You calculate it by adding gross receipts from the three prior years and dividing by three. If the business hasn’t existed for three full years, you average over the period it has been operating.3Internal Revenue Service. Publication 334, Tax Guide for Small Business
Sole proprietors, S corporations, and partnerships without a C corporation partner can use the cash method without worrying about this test, as long as they aren’t otherwise disqualified. The gross receipts test primarily gates whether C corporations, and partnerships that include a C corporation, can use it.4Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting
Entities That Face Restrictions
Three categories run into limits:
- C corporations must use the accrual method unless they pass the gross receipts test or qualify as a personal service corporation.
- Partnerships with a C corporation partner face the same restriction and the same exceptions.
- Tax shelters are prohibited from using the cash method entirely, with no gross receipts exception available.4Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting
The Qualified Personal Service Corporation Exception
Certain C corporations can use the cash method regardless of gross receipts if they qualify as a “qualified personal service corporation.” Two conditions apply. First, the corporation’s activities must consist substantially of services in one of eight fields: health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting. Second, substantially all of the corporation’s stock must be owned by employees performing those services, retired employees, or their estates.4Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting The carve-out lets many professional practices organized as C corporations keep the simpler method.
Businesses with Inventory
Businesses that sell physical products generally need the accrual method to match the cost of goods sold with related revenue. Small businesses that meet the gross receipts test have a workaround: they can treat inventory as non-incidental materials and supplies, deducting the cost when the inventory is provided to customers rather than tracking it through formal inventory accounting.3Internal Revenue Service. Publication 334, Tax Guide for Small Business Many small retailers and product-based businesses stay on cash basis this way.
How It Compares to Accrual
The accrual method records revenue when earned and expenses when incurred, regardless of when money changes hands. A completed project generates income on the books even if the client hasn’t paid. A bill creates an expense even if you haven’t written the check. Accrual pairs the revenue from a transaction with the costs that produced it, which gives a more accurate picture of profitability over time.
The practical difference shows up sharpest at year-end. Complete a $50,000 project on December 15 and get paid January 10. Under cash basis, that $50,000 is next year’s income. Under accrual, it’s this year’s, because the work is done. Both methods eventually recognize the same total income, but the timing gap creates dramatically different snapshots of any single year.
Cash-basis reports also omit accounts receivable and accounts payable. That omission is the method’s real strength for day-to-day management: reported net income tracks your actual bank balance closely, so you always know whether you can make payroll without reconciling phantom income you haven’t collected.
Year-End Tax Planning and Its Limits
The cash method gives small businesses control over the timing of taxable income that accrual doesn’t offer. Because income counts only when received and expenses count only when paid, you can shift both around the December 31 cutoff.
To push income into next year, delay sending invoices or give clients a January payment date instead of December. To pull expenses into the current year, pay outstanding vendor bills before December 31 or make January’s rent payment early. Together these moves can meaningfully reduce a current year’s taxable income. That matters especially for sole proprietors reporting on Schedule C, where business profit flows onto the personal return and affects both income tax and self-employment tax.5Internal Revenue Service. 2025 Instructions for Schedule C (Form 1040)
The flip side is volatility. If a large payment expected in December slips to January, or several clients pay early in the same month, you can end up with a lopsided year that pushes you into a higher marginal bracket. Businesses with lumpy revenue should think about this before committing to cash basis for deferral alone.
One limitation is worth knowing. The IRS has broad authority under Section 446(b) to override your chosen method if it decides cash-basis reporting doesn’t “clearly reflect income” for your business.6Office of the Law Revision Counsel. 26 U.S. Code 446 – General Rule for Methods of Accounting In practice this is rare for straightforward small businesses, but aggressive timing strategies that consistently distort reported income can draw scrutiny.
Switching Methods Later
Changing your accounting method requires IRS approval. Whether you’re switching voluntarily or because you’ve outgrown the gross receipts threshold, you file Form 3115, Application for Change in Accounting Method.7Internal Revenue Service. About Form 3115, Application for Change in Accounting Method
The IRS keeps a list of changes that qualify for automatic consent. If your change is on that list and you meet the eligibility requirements, you file Form 3115 with your tax return and the change is approved without individual review. No user fee applies, and the IRS won’t send an acknowledgment.8Internal Revenue Service. Instructions for Form 3115, Application for Change in Accounting Method Switching between cash and accrual for a small business typically falls under automatic consent. Changes that aren’t on the list require advance consent, a user fee, and a letter ruling from the IRS National Office.
When you switch, some income or expense items would otherwise be counted twice or skipped entirely because the two systems recognize them at different times. The Section 481(a) adjustment catches those items and corrects the gap.8Internal Revenue Service. Instructions for Form 3115, Application for Change in Accounting Method A negative adjustment, reducing your taxable income, is taken entirely in the year of change. A positive adjustment, increasing your taxable income, is spread equally over four years: the year of the switch and the three that follow.9Internal Revenue Service. IRM 4.11.6, Changes in Accounting Methods Failing to file Form 3115 when required can lead to penalties and an IRS-enforced method change on less favorable terms.