Cash vs. Accrual Accounting: Which Method Is Right, and What Form 3115 Actually Requires to Switch

An accounting method determines when income and deductions are recognized for federal tax purposes. The method used in a bookkeeping system and the method used on a tax return can differ, but the business must maintain records that clearly reconcile the difference.

Cash Method

Under the cash method, income is generally included when it is actually or constructively received. Constructive receipt can apply when funds are made available without a substantial restriction, even if the taxpayer has not physically withdrawn them.

Expenses are generally deducted when paid, but prepayment, capitalization, inventory, related-party, and other timing rules can delay a deduction. The cash method is not simply “money in and money out” without exceptions.

Accrual Method

Under the accrual method, income is generally recognized when the right to receive it is fixed and the amount can be determined with reasonable accuracy, subject to the applicable all-events and timing rules. Receipt of payment is not always required.

A deduction generally requires that the liability be fixed, the amount be reasonably determinable, and economic performance occur. Recording an unpaid bill in the accounting software does not, by itself, guarantee a current federal deduction.

Who May Use the Cash Method

Many small businesses may use the cash method under the inflation-adjusted average annual gross-receipts test in IRC §448(c). Eligible small businesses may also use simplified inventory-accounting methods when the statutory requirements are met.

The gross-receipts threshold is adjusted for inflation, and the calculation generally uses a three-year average with aggregation and short-year rules. Certain tax shelters and activities remain subject to separate restrictions. The current-year threshold and the taxpayer's complete ownership structure should be confirmed before relying on the exception.

How a Method Becomes Established

A taxpayer generally adopts an accounting method through consistent treatment on filed federal returns. A method can exist even when the taxpayer did not realize a formal choice was being made. Correcting a mathematical or posting error is different from changing an established method.

Changing Methods and Form 3115

A change in the timing of income or deductions is generally a change in accounting method that requires IRS consent. Form 3115 is used to request that consent. Many common changes qualify for automatic-consent procedures, while others require a nonautomatic request and a user fee.

The Section 481(a) adjustment prevents income or deductions from being duplicated or omitted when the new method is adopted. The year or years over which the adjustment is taken depend on the governing procedure, the direction of the adjustment, and the facts of the change.

Changing a QuickBooks or Xero setting does not obtain IRS consent, and filing one return on a new method without following the applicable procedure can create an unauthorized method change.

The Practical Takeaway

Before changing methods, identify the method actually used on prior returns, determine whether the proposed change is automatic or nonautomatic, calculate the Section 481(a) adjustment, and coordinate the bookkeeping records with the tax reporting.

Accounting-method treatment depends on the taxpayer's facts, prior filings, and current IRS procedures. This information is educational and is not a substitute for advice about a specific method change.