As of January 1, 2023, the IRS has increased the standard mileage rate tax deduction to 65.5 cents per mile. For the first six months of 2022 the rate was 58.5 cents per mile, and for the last six months of 2022 the rate was 62.5 cents per mile.
Generally, you can deduct costs relating to the business use of your vehicle, subject to certain rules and limits. However, you must meet strict substantiation requirements spelled out by the IRS. Notably, you must keep a contemporaneous diary or other log of your business driving activities, including the amount of business mileage for each business use; the total mileage for the tax year; the date of each business use; and the business purpose of each business trip.
To stress the importance of keeping a valid mileage log, see the tax court case below where all the taxpayer’s mileage was disallowed for lack of proper documentation.
The taxpayer reported income and expenses from two business activities for 2015 and 2016. The first involved consulting in the electronic healthcare (EHC) field while the second involved residential construction.
In his EHC business, the taxpayer visited clients and potential clients (e.g., doctor offices and clinics) and help them assess system requirements for participating in the EHC program. He assisted clients in getting updates to the EHC software and documenting any bugs. For his residential construction business, he allegedly performed handyman, construction and residential rehabilitation projects for individuals. But none of his alleged customers reported payments to him on Forms 1099–MISC. His reported expenses vastly exceeded his reported income.
The taxpayer owned three vehicles: a 2008 Mercedes Benz, a 2002 Ford SUV and a 2004 Chrysler. He testified that he used the Mercedes exclusively for his EHC business; that he used the Ford exclusively in connection with his construction business; and that he used the Chrysler exclusively for personal purposes.
To support deductions for vehicle expenses, the taxpayer submitted annotated calendars for the first seven months of 2015 and all of 2016. The annotations show the locations he supposedly visited in connection with either business. For several reasons, the Tax Court didn’t find this evidence credible.
- None of the calendar entries were made contemporaneously with the alleged travel. These were not all-purpose calendars recording various appointments in the taxpayer’s daily life. Rather, he created them solely for use in the IRS examination.
- The taxpayer supplied no evidence linking the locations shown on the calendars to the addresses of his EHC clients. He did not identify a single client who resided or worked at any particular address. Thus, he supplied no evidence that, if he actually made trips to these locations, the journeys were business trips.
- The calendar entries on their face seem questionable. For example, comparing entries for January 2015 and January 2016, the taxpayer asserts he visited the same address in Manhattan on January 1 of each year; that he visited the same address in Brooklyn on January 4 of each year; and that he visited the same address near LaGuardia Airport on January 13 of each year.
Furthermore, the taxpayer also submitted alleged odometer readings for his Mercedes. These were not contemporaneous. Instead, he prepared them during the IRS examination, keying the dates and mileage to the dates and destinations shown on the calendars. When asked how he kept track of start and finish odometer readings for hundreds of trips, he said that he jotted them down on scraps of paper (since discarded). The Tax Court didn’t find this testimony to be credible.
Finally, the descriptions of the business purpose were all the same, a vague reference to “business meetings.”
Bottom line: The Tax Court denied the deductions.