What is a reimbursable expense?
A reimbursable expense is a cost an employee covers for work that the company will pay back. This cheat sheet covers who decides what counts, the travel costs the IRS recognizes and what to check before you pay one back. The detail is further down.
How to think about it
- The company sets the list. Companies are free to decide what they reimburse. The IRS decides what is deductible for tax purposes.
- Tax-free needs a business expense. Paying back a cost that isn't a deductible business expense, like meals for working late at the office, is treated as wages.
- Ordinary and necessary. An ordinary expense is common and accepted in your trade or business. A necessary one is helpful and appropriate, even if it isn't required.
- Write down the exclusions too. A reimbursement policy usually covers airfare, hotel stays, transport, meals and incidentals like parking or Wi-Fi, and names exclusions like personal entertainment or parking tickets.
What to check
- Is the trip overnight? Lodging and meals count as travel expenses only if the trip is overnight or long enough that the traveler needs to stop for sleep or rest.
- Is it commuting? Transportation between home and a main or regular place of work is a personal commuting expense, not travel.
- Who else was on the trip? A spouse's or dependent's travel costs generally aren't deductible unless that person is an employee with a real business purpose for being there.
- Is there a receipt? The IRS generally expects documentary evidence such as a receipt, canceled check or bill. It isn't needed for expenses under $75, except lodging.
Travel costs the IRS counts
| Expense | What counts | Condition |
|---|---|---|
| Transportation | Airplane, train, bus or car between home and the business destination | A free ticket from a frequent traveler program counts as zero cost |
| Car | Operating costs or the standard mileage rate, plus business tolls and parking | For a rental car, only the business-use portion |
| Lodging and meals | Hotel and non-entertainment meals, including food, beverages, taxes and tips | The trip is overnight or needs a stop for sleep or rest |
| Other | Dry cleaning, laundry, business calls and tips on these costs | Incurred while traveling away from home on business |
How it works on Engine
With Direct Bill, Engine pays eligible hotels and invoices the company in arrears, so the room charge never becomes a reimbursable expense. Booking data and company cost fields carry through to the consolidated invoice for reconciliation.
Questions
What expenses are reimbursable?
Whatever the company's policy says. Policies typically include airfare, hotel stays, transport, meals and incidentals like parking or Wi-Fi, and exclude costs like personal entertainment or parking tickets.
Are reimbursed expenses taxable income?
Not when they're paid under an accountable plan, which means a business connection, timely substantiation and returning any excess. Those amounts aren't wages. Reimbursements under a nonaccountable plan are taxed as wages.
Is mileage a reimbursable expense?
It can be. For business use of a car, the IRS lets you count actual costs or the standard mileage rate, plus business tolls and parking. A mileage allowance at or below the federal rate counts as accounted for under an accountable plan.
Can a company reimburse a spouse's travel costs?
It can pay them, but they generally aren't deductible travel expenses. The exception is a person who is an employee, has a real business purpose for the trip and could otherwise deduct the costs.
Sources
- Internal Revenue Service, Publication 463 (2025), Travel, Gift, and Car Expenses, accessed November 2, 2026.
- Internal Revenue Service, Publication 15 (2026), (Circular E), Employer's Tax Guide, accessed November 2, 2026.
- Engine, Best practices for crafting an expense reimbursement policy, accessed November 2, 2026.
- Engine, 42% of Small-Business Travelers Pay Out of Pocket for Work Trips, accessed November 2, 2026.
- Engine, Direct Bill for Company Hotel Travel, accessed November 2, 2026.