Accrual Accounting: Definition and How It Works

Accrual accounting is a method of recording financial transactions in which revenue is recognized when it is earned — and expenses are recognized when they are incurred — regardless of when cash is actually received or paid. Under IRC §446(a), a taxpayer must use the accounting method that clearly reflects income; accrual accounting is one of two primary permissible methods (the other being cash basis, described in IRS Publication 538). Under Generally Accepted Accounting Principles (GAAP), accrual accounting is required for financial statement purposes for nearly all businesses that issue audited or reviewed statements.

Revenue Recognition Under Accrual Accounting

Under the accrual method, revenue is recognized when the right to receive payment has been established — typically when goods are delivered or services are performed. For tax purposes, the IRS applies an "all events" test (Treas. Reg. §1.451-1(a)): income is includible in the year in which (1) all events have occurred that fix the right to receive the income, and (2) the amount can be determined with reasonable accuracy.

For financial reporting under GAAP, the authoritative standard is ASC 606 (Revenue from Contracts with Customers), which requires a five-step model: identify the contract, identify performance obligations, determine the transaction price, allocate the price to obligations, and recognize revenue when (or as) each obligation is satisfied.

A business that bills a client in December but receives payment in January records the receivable and the revenue in December under accrual accounting.

Expense Recognition and the Economic Performance Requirement

On the expense side, accrual-basis taxpayers deduct expenses in the tax year in which an economic performance requirement is satisfied under IRC §461(h). Economic performance generally occurs when:

  • Services are provided to the taxpayer by a third party (e.g., legal fees are deducted when the legal work is performed, not when the invoice is paid)
  • Property is provided to the taxpayer (e.g., inventory or supplies are deducted when received)
  • The taxpayer provides property or services to a third party (deducted as provided)

A narrow exception for recurring items under IRC §461(h)(3) allows a liability to be treated as incurred in the year it accrues (rather than when economic performance occurs) if the item is recurring, the amount is not material, and economic performance occurs within 8½ months of the year end.

Who Is Required to Use Accrual Accounting for Tax Purposes

IRC §448 limits the availability of the cash method and effectively requires certain taxpayers to use accrual accounting:

  • C-Corporations (other than qualified personal service corporations, farming businesses, and certain others) with average annual gross receipts exceeding $30 million (inflation-adjusted; the threshold is $31 million for 2024–2025 per Rev. Proc. 2023-34) for the three prior tax years
  • Tax shelters (as defined in IRC §448(d)(3)), regardless of size
  • Partnerships with C-Corp partners that exceed the gross receipts threshold

S-Corporations, partnerships without C-Corp partners, and sole proprietors may generally continue using the cash method even at high revenue levels — one of the practical advantages of pass-through structures. See the S-Corporation glossary entry for how this interacts with S-Corp taxation.

The §481(a) Adjustment When Switching Methods

When a taxpayer changes from cash basis to accrual (or vice versa), it must make an IRC §481(a) adjustment to prevent items from being duplicated or omitted across years. The adjustment is computed as of the beginning of the year of change and represents the cumulative income or deduction difference between the two methods.

  • A positive §481(a) adjustment (cash-to-accrual switch often produces this) is spread ratably over four tax years under the automatic change procedures in Rev. Proc. 2015-13.
  • A negative §481(a) adjustment is generally taken in full in the year of change.

The change is made on Form 3115, Application for Change in Accounting Method, filed with the IRS. See Switching from Cash Basis to Accrual Accounting for the full §481(a) analysis, Form 3115 mechanics, and planning strategies.

Accrual Accounting and the Taxable Year

The timing of income and expense recognition under accrual accounting is always relative to the taxpayer's taxable year — whether that is a calendar year (ending December 31) or a fiscal year. A fiscal-year accrual-basis taxpayer applies the all-events test and economic performance rules within each fiscal year period, so the year-end date directly controls which transactions appear on which tax return.

How CPAs Use Accrual Accounting in Practice

Revenue timing control: CPAs advise service-business clients on structuring billing and delivery schedules to shift recognized income across year ends — for example, delaying contract completion into the next year to defer a large accrual.

Deferred revenue planning: A business that receives payment before delivering a service (e.g., subscriptions, retainers) may be able to defer the income using the one-year deferral rule under Treas. Reg. §1.451-8, which allows accrual-basis taxpayers to defer advance payments to the following year if the item is also deferred for financial accounting purposes.

Accrued liability acceleration: Under the recurring item exception to §461(h), CPAs analyze whether year-end accrued liabilities (bonuses, professional fees, insurance premiums) meet the 8½-month window to be deductible in the accrual year rather than the payment year.

Gross receipts monitoring: CPAs must track a C-Corp client's three-year average gross receipts against the §448 threshold annually. A client approaching $31 million may face a mandatory method change — triggering Form 3115 and the §481(a) adjustment — with little warning if revenue spikes.

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