Business Mileage Guide

Business mileage is distance driven for an authorized work purpose, recorded under the employer’s rules. A useful mileage process connects each trip to where the employee went, why the travel was necessary, and how the distance was determined. It also separates business driving from ordinary commuting and personal detours. Reimbursement methods and eligible journeys depend on company policy and applicable requirements, so this guide focuses on recordkeeping rather than prescribing a universal rate.

Define which journeys qualify

A policy should explain how employees classify travel from a work location to a client, between company sites, or to another temporary business destination. It should also address travel that begins at home, trips with multiple stops, and journeys that combine business and personal purposes. Do not assume that every drive during a workday is business mileage. When a route includes a personal detour, record the business portion transparently and follow the employer’s allocation rules.

Keep a useful mileage record

Enter the trip close to the time it occurs. A record should typically make the date, origin, destination, business purpose, distance, and employee identifiable. Include supporting appointment or project context when a route alone would not explain the reason for travel. Use the method your organization accepts for measuring distance, apply it consistently, and note route changes that materially affect the recorded journey.

• Date of each business journey.
• Starting point and destination, described precisely enough to identify the trip.
• Work purpose, such as a customer visit or interoffice meeting.
• Business distance and any personal segment excluded under policy.
• Evidence or approval needed for unusual routes or exceptions.

Calculate and submit with care

Follow the organization’s current reimbursement method and never substitute a remembered rate or another employer’s practice. If the policy uses a rate, confirm which rate and effective period the company has approved; if it uses another method, follow that documentation. Check arithmetic, avoid duplicate entries, and ensure the total requested matches the underlying trip records. If the employer requires review or pre-approval for certain travel, include that authorization.

Make review consistent and correct errors

Reviewers should compare dates and destinations with the stated purpose, check for duplicate routes, and request clarification when a distance or detour is unexplained. Correct an error with an auditable adjustment instead of silently overwriting a submitted record. If employees repeatedly misunderstand commuting, home-origin trips, or split-purpose journeys, update policy examples and training. Consistent records help employees receive timely decisions and make travel costs easier for finance to analyze.