Form 3115

A Form 3115 is an IRS application that a taxpayer (individual, partnership, or corporation) files to request permission to change their accounting method. A change in method might be from cash to accrual accounting, from FIFO to LIFO inventory accounting, from a reserve method to a specific-identification method, or dozens of other shifts in how taxable income is calculated.

Types of accounting method changes

An accounting method is the overall system a taxpayer uses to track income and expenses. Common methods include:

• Cash basis: Income recognized when received, expenses when paid.
• Accrual basis: Income recognized when earned, expenses when incurred.
• Hybrid basis: Cash for some items, accrual for others (e.g., accrual for inventory, cash for other expenses).
• Special methods: Long-term contract accounting, installment-sale accounting, percentage-of-completion method.

Within each method, sub-choices include:

• Inventory valuation: FIFO (First In, First Out), LIFO (Last In, First Out), weighted average, specific identification.
• Depreciation: Straight-line, accelerated, Section 179 expensing, bonus depreciation.
• Reserve method vs. direct write-off: For bad debts, one can estimate a reserve or write off only actual bad debts.

Automatic consent changes

The IRS provides a list of ~85 accounting method changes available under “automatic consent.” These include:

• Changing from cash to accrual (with limitations).
• Changing inventory methods (FIFO to LIFO, or vice versa, with some restrictions).
• Changing from reserve to specific-identification for bad debts.
• Adopting Section 179 expensing for the first time.

For automatic-consent changes, the taxpayer files Form 3115, Part II simplified (2-3 pages), with their tax return. There is no IRS approval process—the IRS is deemed to consent if the form is filed correctly. The taxpayer must attach a statement explaining the change and computing any “adjustment” (the one-time tax impact of switching methods).

Non-automatic changes requiring IRS approval

Changes not on the automatic list (perhaps a change in depreciation policy for a specific asset class, or a change in how a special industry calculates income) require affirmative IRS approval. The taxpayer files Form 3115 with a detailed explanation and supporting documentation. The IRS reviews it and either grants consent (issuing a “consent letter”) or denies it. This process takes weeks to months.

Requesting consent for a non-automatic change is risky—if the IRS denies it, the taxpayer is in the position of having made an unauthorized change and owing back taxes plus penalties.

The adjustment and Section 481(a)

When a taxpayer changes accounting methods, there is often a one-time tax impact. A business switching from cash to accrual suddenly recognizes accounts receivable as income. Under accrual, a $100,000 unbilled service is income; under cash, it isn’t. The switch creates a $100,000 “adjustment.”

Section 481(a) of the Tax Code governs how to handle this adjustment:

• Small adjustments (under $25,000) are taken entirely in the year of change.
• Large adjustments (over $25,000) can be spread over 4 years (1/4 per year).
• Negative adjustments (method change reduces taxable income) are taken entirely in the year of change (taxpayer’s advantage).

The Form 3115 includes a schedule computing the Section 481(a) adjustment, and the taxpayer reports it on the amended return.

Who needs Form 3115 and who doesn’t

Not every accounting-related change requires Form 3115. Some examples:

• Changes allowed by the IRC: Adopting qualified business income (QBI) deductions or other statutory elections usually don’t require Form 3115 (they use a different election form).
• Changes in estimate, not method: Adjusting an estimated useful life or salvage value isn’t a “method” change, and doesn’t require Form 3115.
• Corrections of prior errors: If a business made a computational error, correcting it isn’t a method change.

But substantive shifts—cash to accrual, FIFO to LIFO, reserve to specific-identification—all require Form 3115.

Common reasons for method changes

Growth into accrual: A cash-basis sole proprietor grows the business and hires a bookkeeper. For better financial reporting (banks, investors), the business switches to accrual. Form 3115 is filed.

Tax-advantaged switches: A business wants to adopt Section 179 expensing for the first time or change to bonus depreciation to accelerate deductions. Form 3115 is filed (automatic consent for the first adoption of Section 179).

Acquired businesses: When one business acquires another, consolidating them often requires a method change. The acquirer must use the same method for both. Form 3115 is filed.

IRS audit request: An IRS agent reviewing a tax return might challenge the method being used. If the audit concludes the method is wrong, the agent may require Form 3115 to be filed retroactively to “correct” the method. This can result in back taxes and penalties.

Penalties and compliance

Filing Form 3115 is mandatory when a method change occurs. Not filing can result in:

• The IRS adjusting the return and imposing back taxes.
• A 25% “substantial understatement” accuracy-related penalty.
• Additional interest on the back taxes.

If the taxpayer inadvertently makes a method change (e.g., a business starts accruing without realizing it’s a method change), the IRS might allow a filing relief under Revenue Procedure 2019-43. But this relief is narrow and depends on circumstances.

Strategic considerations

Some businesses file Form 3115 strategically. A profitable business might want to switch from cash to accrual, which could increase taxable income in the year of change (accounts receivable become income). This is counterintuitive, but it can be valuable if:

1. The business wants to offset a large one-time gain (sale of asset) or is in a loss carryforward situation.
2. Spreading a large Section 481(a) adjustment over 4 years reduces the per-year impact.

Conversely, a business might want to stay on cash basis as long as possible to defer the recognition of receivables as taxable income.

A tax advisor should review the method change’s full tax impact before filing Form 3115. The adjustment and resulting tax liability can be large.