Reimbursements and Accountable Plans: Keeping Expenses Out of Taxable Wages

The Financial Impact of Accountable Plans

For small businesses, failing to distinguish between a business expense reimbursement and a taxable fringe benefit leads to unnecessary tax liabilities. Without a formal accountable plan, the IRS classifies reimbursements as supplemental wages, subjecting both the employer and employee to FICA, FUTA, and income tax withholding.

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The Three IRS Requirements for an Accountable Plan

To keep reimbursements out of taxable wages, your policy must strictly adhere to the three-prong test defined in IRS Publication 463:

1. Business Connection

The expense must have been incurred while performing services as an employee. It must be an ordinary and necessary business expense under Section 162 of the Internal Revenue Code. Personal expenses disguised as business costs will disqualify the plan.

2. Adequate Substantiation

Employees must provide documentary evidence (receipts, logs, or invoices) within a reasonable period. The documentation must verify:

• The specific amount spent.
• The time and place of the expenditure.
• The specific business purpose.

3. Return of Excess Amounts

If an employer provides an advance, the employee must return any amount that exceeds the substantiated expenses. Failure to return excess funds within a reasonable time (typically 120 days) results in that excess being treated as taxable wages.

The "Reasonable Period" Safe Harbors

The IRS provides "safe harbor" timelines to ensure compliance. Adhering to these prevents the plan from being reclassified as a non-accountable plan:

• Advances: Issued no more than 30 days before the expense is incurred.
• Substantiation: Provided within 60 days after the expense is paid or incurred.
• Return of Excess: Within 120 days after the expense is paid or incurred.

Operational Implementation in Payroll

When processing payroll, accountable plan reimbursements should be recorded as a non-taxable line item. They should not appear in Box 1, 3, or 5 of the employee's Form W-2. Conversely, payments made under a non-accountable plan—such as a flat monthly allowance with no requirement for receipts—must be included in gross wages and are subject to all employment taxes.

Common Pitfalls to Avoid

CPAs frequently identify these errors during audits:

• Rounding Up: Reimbursing $50 when the receipt shows $48.50 without treating the $1.50 as wages.
• Missing Logs: Reimbursing mileage without a contemporaneous log showing starting/ending locations and purpose.
• Commuting Costs: Reimbursing an employee's travel from home to the primary office, which is a non-deductible personal expense.