What is a travel budget?
A travel budget is the number a company plans to spend on business travel, split by category. This cheat sheet covers how to think about one and how to build it. The detail is further down.
How to think about it
- Budget by category. Flights (airfare, taxes, baggage fees), lodging (room charges, service fees, parking), meals, ground transportation, insurance and incidentals like laundry and tips.
- Per diem covers the daily costs. A daily allowance for meals and small costs sets a spending limit per day, which keeps travelers inside the budget.
- Federal rates are a starting point. GSA sets the per diem rates federal agencies use for lodging and meals and incidentals in the continental US. A standard rate covers most of it, with separate rates for about 300 non-standard areas.
- Compare the estimate to the actuals. After the trip, the expense report shows actual spending against the estimate, and where a category was over or under-funded.
How to build a travel budget
- EstimateResearch costs and review past expense reports. Count the trip length, airfare, lodging, meals, ground transportation, conference fees, visas, insurance and incidentals.
- Adjust for demandAccount for the destination's popularity, peak season, accommodation demand and weather risks.
- Find savingsLook at booking ahead, public transit where schedules allow, loyalty programs and flexible fares.
- Draft with a reserveCheck the draft against the company travel policy and add a reserve fund for lost luggage, damaged equipment and other surprises.
- Review and submitHave another travel manager review it, then submit it for approval.
How it works on Engine
Engine travel policies can set flat or tiered nightly rate caps, location-based rate limits, flight cost and cabin-class limits, and daily rental-car caps. Each policy can apply to all members, individual members or departments, and an out-of-policy booking can be blocked, allowed with a reason or allowed with approval. Company fields like project, job code and cost center carry into reporting, so travel spend can be filtered by project or department.
Questions
What should a business travel budget include?
Flights, lodging, meals, ground transportation, insurance and incidentals. For a single trip, also note the dates and how long the employee will be away.
What is a per diem allowance?
A fixed amount of daily reimbursement an employer gives for lodging and meals and incidental expenses (M&IE) when an employee is away from home on business.
Where can I find per diem rates for a city?
GSA publishes per diem rates you can look up by city, state or ZIP code. If a location isn't listed, the standard CONUS rate applies, which covers about 85% of counties in the continental US.
Should a travel budget include a reserve?
Yes. Lost luggage, stolen credit cards and damaged equipment happen, and a reserve fund in the budget cushions those emergencies.
Sources
- Engine, How to create a travel budget: Quick guide with template, accessed November 2, 2026.
- U.S. General Services Administration, Per diem rates, accessed November 2, 2026.
- U.S. General Services Administration, Frequently asked questions, per diem, accessed November 2, 2026.
- Internal Revenue Service, Publication 463 (2025), Travel, Gift, and Car Expenses, accessed November 2, 2026.
- Engine, Company Travel Policy Enforcement, accessed November 2, 2026.
- Engine, Travel Reporting and Analytics, accessed November 2, 2026.