Business vs. Personal Mileage Calculator — guide

The calculator takes your total miles and the breakdown by use — business trips, personal errands, and commuting — and derives the percentage of your total driving that was for business. It then applies the applicable IRS rate to the business miles to estimate a potential standard deduction.

A visual breakdown makes it easy to see how your driving time splits across categories, and how commuting compares to deductible business travel.

Self-employed individuals who use the same vehicle for business and personal driving and want to understand their business-use percentage before claiming a deduction.

Employees exploring whether their work-related driving qualifies for a deduction.

Anyone who wants to understand the IRS distinction between business, personal, and commuting mileage.

Required — Total miles: the total distance the vehicle was driven during the period.

Required — Business miles: miles driven for qualifying business purposes (client visits, job sites, business errands).

Optional — Personal miles: miles for personal use. The tool derives this from total minus business minus commuting if left blank.

Optional — Commuting miles: miles driven between your home and primary workplace. Commuting is generally not deductible.

Optional — Tax year or rate: used to estimate the value of your business miles.

Business-use percentage = business miles ÷ total miles × 100.

Estimated standard deduction = business miles × applicable IRS rate.

The commuting miles field is informational — it shows how much of your total mileage is non-deductible commuting, which is commonly miscategorized as business travel.

The tool validates that business + personal + commuting miles do not exceed total miles and flags any discrepancy.

The results panel shows a percentage breakdown (business, personal, commuting), the business-use percentage figure, the estimated standard deduction at the IRS rate, and each mile category's share of total mileage.

Business-use percentage matters if you also claim actual vehicle expenses: some expense items must be scaled by this percentage to arrive at a deductible amount.

Annual mileage: 15,000 total miles.

Business: 8,500 miles. Personal: 4,500 miles. Commuting: 2,000 miles.

Business-use %: 8,500 ÷ 15,000 = 56.7%.

Estimated standard deduction at the 2025 IRS rate ($0.70/mile): 8,500 × $0.70 = $5,950.

Note: the 2,000 commuting miles are excluded from the deduction estimate.

The tool does not determine whether any specific trip qualifies as business mileage under IRS rules — you supply that categorization.

Commuting rules are complex. Whether driving from home to a work location counts as commuting or business travel depends on factors such as having a home office or traveling to a temporary workplace. Consult a tax professional.

The estimated deduction applies the standard mileage method only. For actual expenses, see the Mileage vs. Actual Expenses tool.

Instead of manually tallying business vs. personal miles at year end, MileLedger lets you categorize every drive as business or personal as you take it. The app tracks your running business-use percentage throughout the year.

Learn more at /features/mileage-tracking.