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 depreciation of a car used for business purposes is a key factor in determining the tax-deductible expenses associated with your vehicle. Depreciation represents the gradual decrease in the value of your car over time due to wear and tear, aging, and obsolescence. When you use a vehicle for business, the IRS allows you to deduct a portion of this depreciation as an allowable business expense. Here's how it works:
  1. Basis of Depreciation: The basis for calculating depreciation is typically the cost of the vehicle, including any sales tax, title fees, and other acquisition costs. If you use the car solely for business, you can depreciate the entire cost. If it's used for both personal and business purposes, you can only depreciate the portion used for business.
  2. Depreciation Methods: The IRS allows two primary methods for calculating depreciation: the Modified Accelerated Cost Recovery System (MACRS) and the Section 179 deduction. Most taxpayers use MACRS, which allows you to depreciate the cost of the car over a specific period of time (usually several years) based on a set depreciation schedule.
  3. Depreciation Schedule: The MACRS depreciation schedule assigns a predetermined percentage of the vehicle's cost as a deductible expense each year over its useful life. For example, a car might be depreciated over five years, with a higher percentage deducted in the early years and a lower percentage in later years.
  4. Bonus Depreciation: In certain situations, you may be able to take advantage of bonus depreciation, which allows you to deduct a larger portion of the vehicle's cost in the first year of use. This can provide significant tax benefits, especially for new vehicles.
  5. Depreciation Limits: The IRS sets annual depreciation limits for passenger vehicles used for business. These limits apply to luxury vehicles and are subject to change each year. It's important to be aware of these limits when calculating your depreciation deductions.
  6. Recapture of Depreciation: When you sell or dispose of the vehicle, you may be required to recapture a portion of the depreciation you previously deducted if the sale results in a gain.
  7. Keep Records: Accurate record-keeping is essential when it comes to depreciation. Maintain records of the vehicle's cost, date placed in service, business use percentage, and depreciation calculations.
  8. Consult a Tax Professional: Depreciation can be complex, and tax laws change. It's advisable to consult a tax professional or accountant who can help you navigate the rules and ensure you maximize your allowable depreciation deductions while staying compliant with IRS regulations.
In summary, when you use your car for business, you can deduct a portion of its depreciation as a business expense, which can result in significant tax savings. However, it's important to follow IRS guidelines, keep accurate records, and consult a tax professional to ensure you're taking full advantage of available deductions while remaining in compliance with tax laws.

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.