Cash vs. accrual accounting is a choice about timing: cash accounting records income when money actually arrives and expenses when money actually leaves, while accrual accounting records both when they’re earned or owed, whether or not cash has moved. Most sole proprietors, freelancers, and small businesses can pick either method. Once average annual gross receipts cross $32 million (the 2026 threshold), federal law generally pushes you onto accrual. The method you use affects when you owe tax, how complicated your books are, and what happens if the business grows.
How Cash Basis Accounting Works
Under the cash method, you report income in the tax year you actually or constructively receive it, and you deduct expenses in the year you pay them. Constructive receipt matters here: if the money was credited to your account or made available to you without restriction, it counts, even if you didn’t physically pick it up. A check handed to you on December 30 is income that year, even if you deposit it in January.
Expenses work the same way in reverse. A payment counts when you mail or deliver the check, not when the recipient cashes it. Credit card charges count as paid on the transaction date, not when you pay off the statement. Bookkeeping stays simple: track what came in and what went out, and you have your taxable income.
One trap catches cash-basis filers. Prepaid expenses generally can’t be deducted all at once; you spread the deduction over the period the payment covers. A narrow exception (the 12-month rule) lets you deduct the full amount when the benefit doesn’t extend past 12 months from when it begins or beyond the end of the next tax year, whichever comes first.
How Accrual Basis Accounting Works
Accrual accounting records economic activity when it happens rather than when cash moves. The IRS uses the all-events test as the trigger for income: you include an item in the year your right to receive it becomes fixed and the amount can be determined with reasonable accuracy. In practice, revenue is recorded when you deliver the product or complete the service, even if the customer hasn’t paid.
Expenses follow a parallel rule. You deduct a cost when the obligation to pay becomes fixed, the amount is determinable, and economic performance has occurred, which generally means the other party has provided the goods or services. If a supplier delivers materials in December and you pay in February, the expense belongs to December.
A recurring item exception softens this for routine bills that straddle year-end. If the liability is fixed and determinable by year-end, recurs regularly, and economic performance happens by the earlier of your filing date or 8½ months after year-end, you can deduct it in the earlier year even without full economic performance. Utility bills are the classic example.
Who the IRS Requires to Use Accrual
Most small businesses can use the cash method without restriction. The mandatory-accrual rules target larger and specific entities. Under 26 U.S.C. §448, three categories of taxpayers generally cannot use cash accounting:
- C corporations
- Partnerships that have a C corporation as a partner
- Tax shelters, regardless of size or revenue
C corporations and partnerships with C-corporation partners still escape the restriction if they pass the gross receipts test. For tax years beginning in 2026, the threshold is $32 million: if your average annual gross receipts over the prior three tax years stay at or below that figure, you can keep using cash. The number adjusts for inflation; it was $31 million for 2025.
Two more exceptions matter. Farming businesses are exempt from the cash-method prohibition entirely. And qualified personal service corporations (health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting, with stock overwhelmingly held by the employees performing those services) can use cash accounting regardless of revenue.
You aren’t locked into a pure system either. A hybrid method that uses accrual for purchases and sales while tracking other items on cash is allowed, provided the combination clearly reflects income and you apply it consistently. But you can’t cherry-pick: if you use cash for income, you must use cash for expenses; if you use accrual for expenses, you must use accrual for income. Any hybrid that includes cash-method elements is treated as the cash method for purposes of the §448 gross receipts restrictions.
Choosing Between the Two Methods
When you have a choice, the decision comes down to timing control versus financial clarity.
Cash accounting gives you levers. Delay sending an invoice until January and you push that income into the next tax year. Stock up on deductible supplies in December and you accelerate the deduction. For businesses with uneven revenue or tight cash flow, that flexibility matters, and the bookkeeping is simpler, which means lower accounting costs and fewer chances to make mistakes.
Accrual accounting gives a more accurate picture of your financial position at any moment, because it captures what you’re owed and what you owe, not just what’s in the bank. Lenders and investors generally prefer accrual-based statements for that reason. If you’re applying for a business loan, seeking outside investment, or planning to sell the company, accrual statements carry more weight. Publicly traded companies must follow Generally Accepted Accounting Principles (GAAP), which require accrual. If you expect to grow into those requirements, starting on accrual avoids a disruptive transition later.
The tax-deferral advantage of cash accounting also shrinks as a business grows. If revenue and expenses are both steady, the two methods often produce similar taxable income over time. Cash accounting shines in the early years, when deferring income recognition frees up cash to reinvest.
Changing Your Accounting Method
You can’t just start doing it differently next year. The IRS requires you to file Form 3115, Application for Change in Accounting Method, and get consent before the change takes effect. Two tracks exist: automatic and non-automatic.
Automatic changes cover the most common situations. You file Form 3115 with your timely filed return (including extensions) for the year you want the change to take effect, and send a signed duplicate copy to the IRS in Ogden, Utah, no later than the date you file the return. A fax option is available. No user fee applies.
Non-automatic changes require a more detailed application with a full legal explanation of why the proposed method is appropriate. The IRS charges a user fee of $12,500 for most non-automatic requests, the review takes longer, and the IRS can deny it.
Switching methods creates a transition problem: some income or expenses could fall through the cracks or get counted twice. The Section 481(a) adjustment prevents this by calculating the cumulative difference between the old and new methods as of the beginning of the year of change. If the adjustment increases your income, you generally spread it evenly over four tax years (the year of change and the following three). If that positive adjustment is under $50,000, you can elect to recognize it all in the year of change. A negative adjustment, one that decreases your income, is taken entirely in the year of change.
What Happens If You Use the Wrong Method
Using an impermissible method, or switching without IRS consent, is expensive. If an examiner discovers the problem during an audit, they’ll recompute your income under a method that, in the Commissioner’s judgment, clearly reflects income, and impose a Section 481(a) adjustment. Unlike a voluntary change where positive adjustments spread over four years, an involuntary change triggered by audit typically forces the entire adjustment into a single year. That can produce a large, unexpected tax bill.
The IRS can also adjust taxable income for the year of the unauthorized change and all affected years after it. Interest accrues on any underpayment from the original due date. For a business that has been using the wrong method for several years, back taxes plus compounded interest add up fast. Getting the method right from the start, or filing Form 3115 promptly once you spot a problem, costs far less than sorting it out during an examination.