How to Convert Accrual to Cash on Your Tax Return

To convert from accrual to cash on your tax return, you file IRS Form 3115 (Application for Change in Accounting Method), calculate a one-time Section 481(a) adjustment from your opening balance-sheet items, attach the signed form to your timely filed return for the year of change, and mail a duplicate copy to the IRS in Ogden. Most small businesses qualify for automatic consent, which means no user fee and no waiting for approval. The adjustment is usually negative — that is, favorable — because accounts receivable typically outweighs accounts payable, and a negative adjustment is taken entirely in the year of change.

Confirm You’re Eligible Before You File

The cash method is available to sole proprietors, single-member LLCs, S corporations, and partnerships without C corporation partners, provided the business isn’t classified as a tax shelter. C corporations and partnerships with C corporation partners are generally barred from cash-basis reporting, but a gross receipts exception lets them in: average annual gross receipts over the prior three tax years cannot exceed $31 million for tax years beginning in 2025, or $32 million for tax years beginning in 2026.¹²

Two other categories bypass the receipts test entirely: qualified personal service corporations (health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting, where substantially all stock is held by employees performing the services or their estates or heirs) and farming businesses.² Tax shelters cannot use the cash method under any exception, even if their receipts fall below the threshold.

If your business doesn’t fit one of these categories, the IRS will reject the application, so verify eligibility before you start on the form.

Calculate the Section 481(a) Adjustment

The 481(a) adjustment is what makes the conversion clean. Without it, income you already reported under accrual would be taxed again when the cash comes in, and expenses you already deducted would never come back off the books. Section 481(a) requires a one-time computation that captures every timing difference the switch would otherwise create.³

Use your balance sheet as of the first day of the year of change. Beginning-of-year figures, not year-end. Four accounts drive the calculation:

Accounts receivable — subtract. This income was already reported under accrual and should not be taxed again when collected.
Prepaid expenses — subtract. Cash left the business but wasn’t yet deducted under accrual; the cash method would have deducted it at payment.
Accounts payable — add. These expenses were deducted under accrual but haven’t been paid, so the deduction has to reverse.
Accrued liabilities — add. Same reasoning as payables: booked but not paid.

The formula is: 481(a) adjustment = −Accounts Receivable − Prepaid Expenses + Accounts Payable + Accrued Liabilities.

Most businesses find receivables dwarf the payable side, which produces a negative adjustment — a reduction in taxable income in the year of change. If you carry deferred revenue (cash collected in advance for goods or services), it typically increases the adjustment because that cash would have been income when received under the cash method. Any balance-sheet account that represents a timing difference between cash movement and recorded income or expense belongs in the calculation.

Report the Adjustment on Your Return

How you take the adjustment depends on its sign.

A negative adjustment is taken in full in the year of change. You reduce that year’s taxable income by the entire amount.⁴

A positive adjustment is spread ratably over four tax years: the year of change plus the three following years. You report one-quarter of the total each year.⁵ If the business closes, is sold, or otherwise stops operating before the four-year period ends, any unrecognized portion of the positive adjustment must be reported in the final year of operations.⁴ There’s no carryover to a successor.

File Form 3115 the Right Way

You cannot simply start using cash on the next return. Federal law requires the IRS’s consent before you change accounting methods, and Form 3115 is how you request it.⁶ The form asks for the business name, EIN, the tax year the change takes effect, and a designated change number (DCN) identifying the type of change.⁷

For a small business switching to the overall cash method under the gross receipts exception, the DCN is typically 233. Farming businesses use DCN 128; certain transportation-industry taxpayers use DCN 126. The Form 3115 instructions list every DCN and its eligibility rules.⁸

Filing has two parts:

Attach the original signed Form 3115 to your timely filed federal income tax return (including extensions) for the year of change.
Mail a duplicate signed copy separately to:
Internal Revenue Service
Ogden, UT 84201
Attn: M/S 6111⁹

The mailed copy can go out no earlier than the first day of the year of change and no later than the date you file the original with your return.⁸ Use certified mail so you have a dated receipt. Missing either submission can cause the IRS to reject the method change.

Automatic Consent vs. Non-Automatic Consent

Most accrual-to-cash conversions qualify for automatic consent. That means you file Form 3115, attach it to the return, mail the duplicate, and begin using the cash method. There is no user fee and no wait for a specific approval letter.⁸

If your situation falls outside automatic consent — for instance, you’re under IRS examination for the same issue, or your specific change isn’t on the current revenue procedure’s automatic list — the non-automatic process applies. You must file Form 3115 during the year of change (January 1 through December 31 for a calendar-year taxpayer) and pay a user fee that currently exceeds $10,000.¹⁰ The IRS National Office reviews the request and, if it approves, issues a letter ruling. Processing typically takes several months.

If You Carry Inventory

Carrying inventory doesn’t automatically block the cash method. If your average annual gross receipts fall within the Section 448(c) threshold, you can treat inventory as non-incidental materials and supplies, deducting the cost of items when you use or sell them rather than when you buy them.¹¹ Alternatively, you can conform your inventory treatment to whatever method your financial statements use.

Report the inventory-related change on the same Form 3115 as the overall method change, and roll any inventory adjustment into your Section 481(a) calculation. Splitting related changes across separate forms creates avoidable complications.

Mistakes That Cause Rejections or Penalties

A few errors show up repeatedly in accrual-to-cash conversions:

Skipping Form 3115 and just switching. The IRS requires consent, and changing methods without it can trigger penalties and let the IRS impose its own adjustment without the four-year spread on positive amounts.¹²
Using the wrong DCN. This can cause outright rejection or push your filing into the non-automatic track with its user fee and delays.
Forgetting the duplicate copy. Both submissions are required; the Ogden mailing is the one people miss.
Miscalculating the 481(a) adjustment. Use beginning-of-year balances for the year of change, not the prior year-end figures or current year-end figures. The wrong date produces a wrong number that the IRS may challenge later.
Filing inventory changes separately from the overall method change when they belong on the same form.

The mechanics are strict but manageable: confirm eligibility, pull an accurate opening balance sheet, run the four-line 481(a) formula, pick the right DCN, and get both copies of Form 3115 where they need to go on time.

1
Internal Revenue Service. Instructions for Form 8990 (12/2025)
2
Office of the Law Revision Counsel. 26 U.S. Code 448 – Limitation on Use of Cash Method of Accounting
3
Office of the Law Revision Counsel. 26 U.S. Code 481 – Adjustments Required by Changes in Method of Accounting
4
Internal Revenue Service. 4.11.6 Changes in Accounting Methods
5
Internal Revenue Service. Rev. Proc. 2024-23 – Changes in Accounting Periods and Methods of Accounting
6
Internal Revenue Service. About Form 3115 – Application for Change in Accounting Method
7
Internal Revenue Service. Form 3115 (Rev. December 2022) – Application for Change in Accounting Method
8
Internal Revenue Service. Instructions for Form 3115 – Application for Change in Accounting Method
9
Internal Revenue Service. Where to File Form 3115
10
Internal Revenue Service. Internal Revenue Bulletin 2025-1 – Rev. Proc. 2025-1
11
Office of the Law Revision Counsel. 26 U.S. Code 471 – General Rule for Inventories
12
Office of the Law Revision Counsel. 26 USC 446 – General Rule for Methods of Accounting