Quick Answer
A contemporaneous mileage log records business trips at or near the time they occur — IRS Publication 463 standard. GPS shift-session logs qualify when they capture date and miles automatically during work, not reconstructed weeks later.
Direct answer
A contemporaneous mileage log records business trips at or near the time they occur — IRS Publication 463 standard. GPS shift-session logs qualify when they capture date and miles automatically during work, not reconstructed weeks later.
End-of-month Excel reconstruction fails IRS and employer audit standards.
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