Employee Reimbursements in Payroll: Accountable Plans and Non-Taxable Payments

The Operational Mechanics of Non-Taxable Employee Reimbursements

In the eyes of the IRS, any payment made to an employee is considered taxable wages unless it specifically qualifies for an exclusion. To process an employee reimbursement payroll event without triggering federal income tax, Social Security, or Medicare withholdings, the payment must be made under an 'Accountable Plan.'

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The Three Pillars of an Accountable Plan

To qualify for non-taxable reimbursement status, your business must strictly adhere to three IRS requirements defined in Publication 463:

• Business Connection: The expense must have been paid or incurred while performing services as an employee. Personal expenses are never reimbursable under an accountable plan.
• Substantiation: Employees must provide documentary evidence (receipts, logs, or invoices) within a reasonable period—typically 60 days. The documentation must show the amount, time, place, and business purpose.
• Return of Excess Funds: If you provide an advance, the employee must return any amount exceeding the actual substantiated expenses within a reasonable period—typically 120 days.

Common Reimbursable Categories

While many business costs qualify, the most frequent accountable plan reimbursement items include:

• Mileage: Reimbursed at the annual IRS standard mileage rate.
• Travel: Airfare, lodging, and 50% of business meals (subject to current tax year rules).
• Home Office/Tools: Necessary equipment or a portion of internet costs required for the role.

Payroll Processing and Reporting

When an expense meets the accountable plan criteria, it is not reported as wages on the employee's Form W-2. It is a tax-free distribution. However, if any of the three pillars are missing, the plan becomes 'non-accountable.' In this scenario:

1. The reimbursement must be included in the employee's gross wages.
2. The amount is subject to all payroll tax withholdings (FICA, FUTA, SUTA).
3. The payment must be reported in Box 1 of the W-2.

Best Practices for Compliance

To protect your firm during a Department of Labor or IRS audit, maintain a written Accountable Plan document. Ensure your payroll system can distinguish between 'Reimbursement' (non-taxable) and 'Bonus/Allowance' (taxable) pay types. Never 'round up' reimbursements; paying an even $500 for a $482 expense without substantiating the difference converts the entire payment into taxable income.