Are Expense Reimbursements Taxable? Federal Payroll Rules Explained

Published: October 2026 | Last updated: October 2026

Short answer: Expense reimbursements are not taxable wages when they are paid under an IRS accountable plan. To qualify, the expense must have a business connection, the employee must adequately substantiate the expense within a reasonable time, and the employee must return any excess reimbursement within a reasonable time.

If those rules are not met, the reimbursement is generally treated as taxable wages. That means it must be included in payroll, reported on Form W-2, and subject to federal income tax withholding, Social Security, Medicare, and FUTA taxes.

What Is an Expense Reimbursement?

An expense reimbursement is a payment from an employer to an employee for a business expense the employee paid or incurred while performing services for the employer.

Common examples include:

• Business mileage
• Work-related travel
• Lodging
• Meals while traveling for business
• Parking and tolls
• Airfare
• Supplies
• Required business tools
• Client meeting expenses
• Conference or training expenses
• Cell phone or internet expenses used for business

The tax treatment depends on how the reimbursement is handled. The IRS separates employee business expense reimbursements into two main categories: accountable plans and nonaccountable plans.

Anchor fact: The same expense can be non-taxable under an accountable plan and taxable under a nonaccountable plan.

What This Is

This is an explanation of how federal payroll rules apply to employee expense reimbursements.

It explains when reimbursements are excluded from wages, when they become taxable wages, what an accountable plan requires, what a nonaccountable plan means, and how payroll should handle reimbursements for W-2 reporting.

This article focuses on federal payroll tax rules for employee business expense reimbursements.

What This Is Not

This is not legal or tax advice.

This is not a state-by-state reimbursement law guide.

This is not a guide to whether an employer is required to reimburse every employee expense.

This is not a full fringe benefit guide.

This is not a contractor reimbursement guide.

This is not a guide to the employer’s business income tax deduction for expenses.

Independent contractors, partners, owners, and employees receiving fringe benefits may have different reporting rules. State laws may also require reimbursement of certain business expenses even when federal tax law does not.

Who Does This Apply To?

This applies to employers that reimburse W-2 employees for business expenses.

It is especially relevant for businesses that reimburse employees for:

• Mileage
• Travel
• Meals
• Lodging
• Office supplies
• Cell phone use
• Remote work expenses
• Business meals or client meeting expenses that meet IRS substantiation and deductibility rules
• Training or continuing education
• Tools or equipment used for work

This also applies to payroll teams, HR teams, bookkeepers, accountants, and business owners who decide whether