The rates used
The log reads the IRS standard mileage rates from a single configuration file, updated each year:
- January 1, 2025 – December 31, 2025: business 70.0¢, medical and moving 21.0¢, charitable 14¢ per mile.
- January 1, 2026 – June 30, 2026: business 72.5¢, medical and moving 20.5¢, charitable 14¢ per mile.
- July 1, 2026 – December 31, 2026: business 76.0¢, medical and moving 23.5¢, charitable 14¢ per mile.
Source: IRS standard mileage rates. A trip dated outside these periods is flagged instead of being valued with a guessed rate.
Keeping a log that holds up
- Record trips the same day or week, not reconstructed at tax time.
- Write a purpose an auditor would understand: "Site visit, Smith kitchen remodel", not "Work".
- Note the odometer on January 1 and December 31 to show total versus business miles.