Federal tax law makes you pick a consistent way to record income and deductions, and the choice controls the timing of both. The main income tax accounting methods are the cash method and the accrual method, with hybrid arrangements and a handful of specialized methods available for particular situations.1Office of the Law Revision Counsel. 26 USC 446 – General Rule for Methods of Accounting Your entity type, your size, and whether you sell goods all shape which methods you can actually use.
The Cash Method
Under the cash method, you report income in the year you actually receive it and deduct expenses in the year you actually pay them. A freelancer who invoices in November but gets paid in February reports the payment in the year the check arrives. Most individuals and small businesses use this approach because bank statements track closely with the tax picture.
The catch is constructive receipt. If money is credited to your account, set aside for you, or otherwise available without meaningful restriction, the IRS treats it as received even if you haven’t collected it.2eCFR. 26 CFR 1.451-2 – Constructive Receipt of Income A check sitting in your mailbox on December 30 counts as that year’s income even if you deposit it in January. You cannot defer income by ignoring it.
On the deduction side, expenses count when the money leaves your hands, whether by check, cash, or credit card.3eCFR. 26 CFR 1.461-1 – General Rule for Taxable Year of Deduction
The 12-Month Rule for Prepaid Expenses
Cash-method taxpayers sometimes prepay expenses to accelerate deductions, but the 12-month rule sets a limit. You can deduct a prepaid expense in the year you pay it only if the benefit does not extend beyond 12 months from the date the benefit begins, and not beyond the end of the following tax year. A one-year insurance premium paid in December qualifies. A two-year service contract does not, and gets spread over the periods it covers. Annual insurance premiums, 12-month software subscriptions, and one-year lease payments are typical qualifying items.
The Accrual Method
The accrual method disregards when cash moves. Income counts when your right to it is locked in; expenses count when the obligation to pay them arises and the other side has actually performed. Larger businesses and businesses with significant inventory typically use accrual because it lines revenue up with the activity that produced it.
When Income Is Recognized
Accrual taxpayers apply the all events test. Income goes on the return once every event fixing your right to receive it has occurred and the amount can be calculated with reasonable accuracy.4eCFR. 26 CFR 1.451-1 – General Rule for Taxable Year of Inclusion Deliver goods in December under a signed $50,000 contract, and that $50,000 belongs on this year’s return regardless of when the customer pays.
When Expenses Are Deducted
Deductions require both the all events test and economic performance. All the facts fixing the liability must have occurred and you must be able to pin down the amount, but you also cannot claim the deduction until the other party actually delivers the goods or performs the services.5Office of the Law Revision Counsel. 26 USC 461 – General Rule for Taxable Year of Deduction Signing a contract for future consulting work creates no current deduction; the consultant has to do the work first.
The Recurring Item Exception
A useful shortcut lets accrual taxpayers deduct certain liabilities before economic performance actually happens, if four conditions are met:6Internal Revenue Service. Revenue Ruling 2007-12
- By year-end, the fact and amount of the liability are established.
- The services or property are provided by the earlier of the date you file your return or 8.5 months after the close of the tax year.
- The expense is one you can reasonably expect to incur again in later years.
- Either the amount is immaterial or deducting it now produces better matching against the related income.
This helps with recurring costs like property taxes, insurance, and utility bills that straddle year-end. For tax liabilities specifically, the matching requirement is treated as automatically satisfied.
Who Cannot Use the Cash Method
Not everyone gets to choose. Three categories are generally barred from the cash method: C corporations, partnerships that have a C corporation as a partner, and tax shelters.7Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting The first two can escape the restriction by passing the gross receipts test below. Tax shelters cannot use the cash method under any circumstances, and the label reaches further than many owners expect: it covers businesses whose ownership interests must be registered with a securities regulator, pass-through entities that allocate more than 35 percent of losses to passive owners, and any arrangement whose principal purpose is tax avoidance.
The Gross Receipts Test
C corporations and partnerships with C corporation partners can still use the cash method if they qualify as small business taxpayers. Average your gross receipts over the three prior tax years; if the average is $32 million or less, you qualify. That $32 million figure applies for the 2026 tax year.8Internal Revenue Service. Rev. Proc. 2025-32 The statutory base of $25 million is adjusted annually for inflation and rounded to the nearest million.7Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting A business that has not been around for three full years averages over the years it has existed.
Meeting the test also unlocks several other simplifications, including relief from the uniform capitalization rules and simplified inventory accounting.
Inventory Simplifications for Small Businesses
Businesses that produce or sell goods once had to track inventory under complex capitalization rules. The Tax Cuts and Jobs Act relaxed that for small business taxpayers meeting the $32 million gross receipts test. Qualifying businesses can choose one of three approaches instead of full accrual-based inventory accounting:
- Treat inventory as non-incidental materials and supplies, deducting the cost when paid or when used, rather than when sold.
- Match whatever method appears on the business’s audited financial statements.
- Follow the accounting procedures used in the business’s own books and records, if there are no audited financial statements.
Qualifying small businesses are also exempt from the Section 263A uniform capitalization rules that otherwise force producers and resellers to capitalize certain indirect costs into inventory.8Internal Revenue Service. Rev. Proc. 2025-32
Hybrid and Specialized Methods
Hybrid Method
A hybrid method mixes cash and accrual within the same business. The most common version uses accrual for inventory purchases and sales while handling the rest on the cash basis. The combination is acceptable as long as it produces an accurate picture of income and you apply it consistently.
Installment Method
When you sell property and the buyer pays over time, the installment method spreads the gain across the years payments actually arrive rather than reporting the entire profit upfront.9Office of the Law Revision Counsel. 26 USC 453 – Installment Method Each payment splits into return of your original investment, interest income, and taxable gain. The method applies automatically to qualifying sales unless you elect out. Dealers who regularly sell inventory cannot use it.
Long-Term Contract Methods
Construction and manufacturing projects that span more than one tax year fall under Section 460. Two methods dominate:
- Percentage-of-completion reports a share of total contract income each year based on how much work is done. A project 40 percent complete at year-end puts roughly 40 percent of expected profit on that year’s return. The IRS requires this method for contractors whose average annual gross receipts exceed the small business threshold ($32 million for 2026).10Office of the Law Revision Counsel. 26 USC 460 – Special Rules for Long-Term Contracts
- Completed-contract reports no income or expense until the project is finished and accepted. It is available to small contractors below the threshold and for home construction contracts regardless of size.
Contracts that start and finish within the same tax year do not trigger these rules.
Changing Your Method Once You Have Chosen
You cannot just start using a different method next year. The IRS requires formal approval on Form 3115.11Internal Revenue Service. About Form 3115, Application for Change in Accounting Method Some changes qualify for automatic consent (moving from cash to accrual, adopting the small business inventory exception, and other common switches on the IRS’s published list); others require advance approval from the IRS National Office, take longer to process, and carry a $2,500 user fee.12Internal Revenue Service. Schedule of IRS User Fees Automatic changes have no fee. If your change is on the automatic list, you must use the automatic procedure.
The Section 481(a) Adjustment
Switching methods risks double-counting or dropping items. The Section 481(a) adjustment prevents both by computing the cumulative difference between what you reported under the old method and what you would have reported under the new one.13Office of the Law Revision Counsel. 26 USC 481 – Adjustments Required by Changes in Method of Accounting The timing depends on direction. A positive adjustment (one that increases income) spreads ratably over four years: the year of change plus the next three. A negative adjustment (one that decreases income) hits entirely in the year of change.14Internal Revenue Service. Rev. Proc. 2015-13 Taxpayer-favorable adjustments arrive immediately; government-favorable ones phase in so the bill does not spike.
Penalties for Using the Wrong Method
Using a method that fails to clearly reflect income, or applying your chosen method inconsistently, can trigger the accuracy-related penalty of 20 percent of the resulting tax underpayment.15Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments Beyond the penalty, the IRS can force a retroactive change to the method it considers correct and impose the full Section 481(a) adjustment in a single year, with no four-year spread. Pick a method you are eligible for, apply it consistently, and file Form 3115 before switching rather than changing on your own.