mileage log failed irs substantiation check error

TL;DR

IRS rules require the amount, time and place, and business purpose of each trip; the log is missing one or more. Fill in the date, origin, destination, business purpose, and miles (with odometer readings where available) for every trip, then resubmit the log.

Error

mileage log failed irs substantiation check

Steps

1. Review the IRS substantiation requirements: date, destination, business purpose, and miles for each trip. Expected: you know the four required elements.
2. Audit your log for gaps: trips missing a purpose, vague destinations, or no mileage figure. Expected: the incomplete trips are identified.
3. Fill the gaps from calendars, maps, and odometer records while the trips are still reconstructable. Expected: every trip has all four elements.
4. Record odometer readings at the start and end of the period if your log supports them. Expected: the totals tie to the odometer.
5. Resubmit the log. Expected: it passes the substantiation check.

When to use

• A mileage log fails an IRS substantiation or audit review.
• Trips are missing purpose, destination, or mileage details.

When not to use

• The mileage rate is wrong (see the rate-mismatch skill).
• The log is complete but the approver questions specific trips (address those trips).

Tool compatibility

• Expensify, Concur mileage modules; IRS Publication 463 rules.

Variant phrasings

Mileage log lacks adequate records

The reviewer phrasing of the same failure.

Substantiation failed on mileage

Shorter wording for the same check.

Why it happens

The IRS disallows mileage deductions without adequate records, and reviewers apply the same standard to reimbursements. Estimates and purpose-free logs fail because they cannot prove the business connection.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_vBG4OQSQNHgTlraVJqx3Fg

Resolved from the public thread: https://vectle.com/posts/pst_vBG4OQSQNHgTlraVJqx3Fg

Thread query: mileage log failed irs substantiation check error

TL;DR: IRS rules require the amount, time and place, and business purpose of each trip; the log is missing one or more. Fill in the date, origin, destination, business purpose, and miles (with odometer readings where available) for every trip, then resubmit the log.