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.


The Slacklog algorithm used to generate a mileage log spreadsheet involves automating the process of recording and calculating mileage based on input data. Here's a high-level overview of how the Slacklog algorithm works:

Input Data:

  • Start and end dates of the mileage log.
  • Date of each trip.
  • Business purpose of the trip.
  • An estimation of the mileage, based on odometer readings, for the trips.
  • Any additional information, such as lease, parking fees, insurance, registrations, etc.

Algorithm Steps:

  1. Data Entry and Validation:
    • Collect the input data from the user or other sources.
    • Validate the data to ensure accuracy and completeness.
  2. Distance Extrapolation:

    This gives you the total miles driven for each trip.

  3. Mileage Type Selection:

    Determine the type of mileage (i.e., business) for each trip based on user input.

  4. Expense Tracking (Optional):

    If the algorithm is also used for expense tracking, you can collect data on parking fees or other expenses associated with the trips.

  5. Spreadsheet Generation:

    Create a spreadsheet or data structure that includes columns for date, starting date, ending date, mileage, purpose, and other relevant information.

  6. Record Creation:

    For each trip, create a new record in the spreadsheet with the calculated mileage, date, purpose, and other details.

  7. Running Totals:

    Maintain running totals for each type of mileage (business) to provide a summary at the end of a specified time period (e.g., annually).

  8. User Interaction:

    Provide an interface for users to add, edit, or delete records.

  9. Export or Reporting:

    Depending on user preferences, integrate with accounting and tax software.

  10. Error Handling:

    Implement error handling to manage exceptions and incorrect data entries.

  11. Data Storage:

    Consider how to email the mileage data securely.

  12. Security and Privacy:

    Implement measures to protect the user's data, especially if it contains sensitive information.

Additional features like support for different units of measurement are now available, based on user feedback.

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.