Frequently Asked Questions

Do you need to log your business miles for the IRS?

Slacklog is a mileage log generator.

It only takes 15 minutes to generate a printable mileage report for your annual tax return. It's private and secure.

The cost is $10 with a Credit or Debit Card.

You answer a series of questions, and it creates a mileage log. You will receive a minimally formatted XLSX file with pre-filled data you can customize in your preferred spreadsheet editor.

Why Slacklog?

Using a mileage log allows you to accurately track your vehicle-related expenses, including fuel, maintenance, insurance, and depreciation. This helps you claim the correct deductions and ensures you don't overlook any eligible expenses.


It's not uncommon for the total miles recorded in your business mileage log to be less than the total miles on your car's odometer, and in most cases, this is perfectly acceptable when filing your tax return. Here are some important points to consider:
  1. Personal vs. Business Miles: Your car's odometer records all miles driven, including personal trips, commuting, and business-related travel. When you calculate your deductible business mileage, you should only include the miles driven for business purposes, not personal or commuting miles.
  2. Documentation Matters: What's crucial is that you have accurate and well-documented records of the miles you actually drove for business. The IRS requires detailed records to substantiate your mileage deductions. This includes recording the date, purpose of the trip, starting and ending locations, and the number of business miles driven.
  3. Potential Red Flags: While it's acceptable for your business mileage to be less than your total odometer reading, having a significant difference might raise red flags during an IRS audit. The IRS might inquire about the reasons for the difference, so it's important to maintain clear records to explain any discrepancies.
  4. Round Trips and Non-Deductible Miles: Remember that only the miles driven for business purposes are deductible. If you have round-trip business journeys (e.g., from your office to a client's location and back), you should only count the one-way distance. Commuting miles are generally not deductible, so they should not be included in your business mileage log.
  5. Personal Use Percentage: If you use your vehicle for both personal and business purposes, you'll need to calculate the percentage of business use. This percentage is used to determine the portion of your vehicle-related expenses that are deductible.
  6. Consult a Tax Professional: To ensure that you are accurately calculating and reporting your mileage deductions, it's a good idea to consult with a tax professional or accountant. They can help you navigate the rules and guidelines specific to your situation and provide guidance on maintaining proper documentation.
In summary, it's acceptable for your business mileage to be less than your car's total odometer reading, but accurate and well-documented records are essential. Ensure that you are only deducting the miles driven for legitimate business purposes and not including personal or commuting miles. If you have any doubts or concerns, seek professional tax advice to help you with your tax return.

Deductions for Business Use

If you use your vehicle for business purposes, you can deduct the expenses related to that use. The Slacklog mileage log helps you track the number of miles you drive for business, which can be used to calculate your deduction. This can significantly reduce your taxable income and lower your tax liability.

Are you an accountant?

Interested in providing Slacklog to your clients? Contact us for a bulk license.

Tax day is coming

Get your mileage log early. This will give you time to adjust it and make it accurate.