Accrual Basis Accounting: Rules, Revenue Recognition, and Form 3115

Accrual basis accounting records income when it is earned and expenses when they are incurred, regardless of when cash actually changes hands. For federal tax purposes in 2026, the method is mandatory for C corporations, partnerships that have a C corporation as a partner, and tax shelters — with a size-based exemption for smaller businesses whose average annual gross receipts are $32 million or less. Publicly traded companies must also use it, because the SEC requires financial statements prepared under generally accepted accounting principles, and GAAP is built on accrual.

Who Has to Use the Accrual Method

Section 448 of the Internal Revenue Code bars three categories of taxpayers from the simpler cash method: C corporations, partnerships with a C corporation as a partner, and tax shelters.¹ Tax shelters must always use accrual. C corporations and partnerships with corporate partners get an exemption if they stay small.

The size test looks at average annual gross receipts over the three tax years ending before the current one. For tax years beginning in 2026, the threshold is $32 million. Stay at or below that average and you can keep using cash-method accounting. Cross it and you must switch to accrual. The figure is adjusted annually for inflation: it was $30 million in 2024, $31 million in 2025, and now $32 million, so check the current revenue procedure each year.²

The Personal Service Corporation Exception

Qualified personal service corporations can use the cash method regardless of gross receipts. To qualify, substantially all of the corporation’s work must be in health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting. Substantially all of the stock, measured by value, must be held by current or retired employees who perform those services, their estates, or people who inherited shares within two years of the employee’s death.¹ A medical practice owned entirely by its physicians can stay on the cash method even at gross receipts well above $32 million.

Public Companies and the SEC

Publicly traded companies face a separate obligation. SEC regulations presume that financial statements not prepared under GAAP are misleading, regardless of any footnote disclosures.³ Because GAAP is built on accrual accounting, every SEC registrant must use it for financial reporting. This is independent of the tax code, so a company can be small enough to file cash-method returns while still preparing accrual-basis statements for its investors and lenders.

When Revenue Is Recognized

Under GAAP, the Financial Accounting Standards Board’s ASC 606 framework governs revenue timing. The core principle: a company recognizes revenue when it transfers promised goods or services to a customer, in the amount it expects to receive.⁴ The standard breaks the analysis into five steps:

Identify a legally enforceable contract with the customer.
Identify each distinct good or service you have promised.
Determine the total price you expect to receive.
Allocate that price to the deliverables based on their standalone value.
Recognize revenue on each deliverable as you complete it.

The framework prevents front-loading. A software company selling a two-year license with ongoing support cannot book the full contract price on day one. It has to spread recognition across the deliverables as each is satisfied.

For tax purposes, Section 451(b) adds a timing floor. Accrual-method taxpayers must recognize income no later than when it appears as revenue on their applicable financial statement, typically an audited GAAP statement filed with the SEC or used for credit purposes.⁵ The underlying “all events test” treats income as fixed once the right to receive it exists and the amount can be determined with reasonable accuracy. The financial statement rule keeps the tax return from deferring income any longer than the books already do.

Advance Payments

Collecting cash before the work is done creates an obvious tension for an accrual-method business. Section 451(c) allows a limited deferral. A taxpayer can elect to include only the portion of an advance payment that appears as revenue on its financial statement for the year of receipt and push the remainder into the very next tax year, but no further.⁵

The one-year deferral covers advance payments for services, sales of goods, software licensing, subscriptions, memberships, and guaranty or warranty contracts. It does not cover rent, insurance premiums, or payments tied to financial instruments. If a gym collects annual membership dues in November 2026, it reports whatever portion it recognized as revenue that year on its financial statements in 2026 and reports the rest in 2027. There is no option to stretch the balance into 2028, even if the membership runs through October 2027.

If the business ceases to exist before fulfilling the obligation, all deferred advance payments accelerate into income in the final tax year.⁵ That result sometimes blindsides owners during a dissolution or during an acquisition that doesn’t qualify as a tax-free reorganization.

When Expenses Are Deductible

The GAAP matching principle says expenses land in the same period as the revenue they helped generate. The tax code is stricter. Under Section 461(h), an accrual-method taxpayer cannot deduct an expense until two conditions are both met: the all events test is satisfied for the liability, and economic performance has occurred.⁶

What counts as economic performance depends on the expense:

For services or property provided to you, economic performance happens as the other party delivers, not when you sign the contract or receive the invoice.
For services or property you provide to others, economic performance happens as you deliver.
For workers’ compensation and tort liabilities, economic performance happens only as you make payments, even if the liability was established years earlier.

The workers’ compensation and tort rule is where many businesses get caught. A legal settlement may accrue on the GAAP books in the year the case is lost, but the tax deduction has to wait until the check is actually written.⁶ That gap between book expense and tax deduction is a common source of temporary differences for accrual-method taxpayers.

The Balance Sheet Accounts the Method Creates

Accrual accounting creates several balance sheet accounts that have no counterpart in cash-basis bookkeeping.

Accounts receivable represents revenue earned and recorded but not yet collected. When you deliver a product and invoice on 30-day terms, the sale hits revenue immediately and accounts receivable rises by the same amount. Cash follows later.

Prepaid expenses are the mirror image on the payer’s side. Pay a 12-month insurance premium in January and the full amount sits as a prepaid asset, with one-twelfth moving into insurance expense each month as coverage runs.

Accounts payable covers amounts owed to suppliers for goods or services already received. You’ve consumed the resource, so the expense is recorded, but the check has not gone out.

Accrued liabilities capture obligations that have built up without being invoiced or paid yet. Wages earned between the last payday and month-end are the classic case. Interest accumulated on a loan since the last payment and estimated income taxes for the current quarter belong here too. These entries put costs in the period the obligation actually arose.

Bad Debts

Because accrual-method businesses record revenue before collecting cash, some receivables will not be paid. The tax rules for writing them off differ sharply from GAAP. Under GAAP, companies estimate uncollectible accounts at year-end and record an allowance. The IRS does not allow that. Section 166 permits a deduction only when a specific debt becomes worthless, either wholly or in part.⁷

Congress repealed the reserve method for tax purposes in 1986.⁷ The result is a recurring gap between books and tax return. You’ll carry a GAAP allowance for doubtful accounts but can only claim the tax deduction when you can identify a specific receivable and show it is uncollectible. For partially worthless debts, you must actually charge off the uncollectible portion on the books before claiming the deduction, and the IRS has discretion over the amount accepted.

Inventory and the Small Business Exception

Businesses that produce, purchase, or sell merchandise have traditionally been required to maintain inventories on an accrual basis. Buy 1,000 widgets in December, sell 200 before year-end, and cost of goods sold reflects only those 200. The other 800 sit on the balance sheet as inventory until sold.

The Tax Cuts and Jobs Act carved out an exception under Section 471(c). A business that meets the Section 448(c) gross receipts test — average annual receipts of $32 million or less for 2026 — can skip traditional inventory accounting entirely. Two options are available: treat inventory as non-incidental materials and supplies, deducting the cost when items are sold or consumed (whichever is later), or match the tax inventory method to whatever is used on the financial statements.⁸

Tax shelters are locked out of the Section 471(c) exception regardless of their receipts. Any change in inventory method under this section is treated as a voluntary accounting method change, which triggers the transition adjustment described below.⁸

Switching to Accrual: Form 3115 and the Section 481(a) Adjustment

A business that crosses the $32 million threshold, or that voluntarily wants to switch, cannot simply start using accrual on the next return. IRS consent is required, obtained by filing Form 3115, Application for Change in Accounting Method. For automatic changes, which cover most common transitions, the original form is attached to a timely filed return for the year of the change, with a duplicate sent to the IRS National Office.⁹

The bigger issue is the Section 481(a) adjustment. When the method changes, items of income or expense that would otherwise be counted twice, or missed entirely, must be corrected with a one-time entry.¹⁰ If you have been on the cash method with $200,000 in accounts receivable that was never taxed, switching to accrual means that income must be recognized. The Section 481(a) adjustment picks it up.

How quickly the adjustment lands depends on direction:

A positive adjustment (more taxable income) is spread equally over four tax years: the year of the change and the three that follow. If the total positive adjustment is under $50,000, the taxpayer can elect to take it all in one year.¹¹
A negative adjustment (less taxable income) is taken entirely in the year of the change.¹¹

If the IRS forces the change during an audit rather than the taxpayer initiating it, the full positive adjustment hits in the year of the change with no four-year spread.¹¹ Switching voluntarily, before the IRS raises the issue, generally produces a better outcome both because of the spread and because it shows good-faith compliance.

1
Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting
2
Internal Revenue Service. Revenue Procedure 2025-32
3
eCFR. 17 CFR Part 210 – Form and Content of and Requirements for Financial Statements
4
Financial Accounting Standards Board. Accounting Standards Update 2014-09
5
Office of the Law Revision Counsel. 26 USC 451 – General Rule for Taxable Year of Inclusion
6
Office of the Law Revision Counsel. 26 USC 461 – General Rule for Taxable Year of Deduction
7
Office of the Law Revision Counsel. 26 USC 166 – Bad Debts
8
Office of the Law Revision Counsel. 26 USC 471 – General Rule for Inventories
9
Internal Revenue Service. Instructions for Form 3115
10
Office of the Law Revision Counsel. 26 USC 481 – Adjustments Required by Changes in Method of Accounting
11
Internal Revenue Service. IRM 4.11.6 – Changes in Accounting Methods