function calculateDeduction() {
// Get Mileage Inputs
var bMiles = parseFloat(document.getElementById('businessMiles').value) || 0;
var mMiles = parseFloat(document.getElementById('medicalMiles').value) || 0;
var cMiles = parseFloat(document.getElementById('charityMiles').value) || 0;
// Get Rates
var bRate = parseFloat(document.getElementById('rateBusiness').value) || 0;
var mRate = parseFloat(document.getElementById('rateMedical').value) || 0;
var cRate = parseFloat(document.getElementById('rateCharity').value) || 0;
// Calculate Totals
var bTotal = bMiles * bRate;
var mTotal = mMiles * mRate;
var cTotal = cMiles * cRate;
var grandTotal = bTotal + mTotal + cTotal;
// Display Results
document.getElementById('resBusiness').innerText = '$' + bTotal.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resMedical').innerText = '$' + mTotal.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resCharity').innerText = '$' + cTotal.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resTotal').innerText = '$' + grandTotal.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Show Result Box
document.getElementById('results').style.display = 'block';
}
Understanding the 2025 Federal Mileage Rates
Navigating tax deductions for vehicle use requires staying up to date with the Internal Revenue Service (IRS) standard mileage rates. This Federal Mileage Rate 2025 Calculator helps self-employed individuals, business owners, and employees estimate their potential tax deductions or reimbursement amounts based on miles driven for specific qualifying purposes.
What are the Standard Mileage Rates?
The standard mileage rate is a simplified method used by the IRS to calculate the deductible costs of operating an automobile for business, charitable, medical, or moving purposes. Rather than tracking actual expenses like gas, insurance, depreciation, and repairs, taxpayers can simply multiply their qualifying miles by the standard rate.
Important Note on 2025 Rates: The IRS typically announces official rates for the upcoming year in late December. The calculator above uses the most recent standard rates (based on 2024 data: 67 cents/mile for business) as a baseline. You can manually adjust the rates in the "Applicable Rates" section if new figures are released.
Mileage Categories Explained
Business Miles: This is the most common deduction. It applies to miles driven for business purposes, such as visiting clients, traveling between job sites, or meeting with customers. Commuting from your home to your regular place of work is generally not deductible.
Medical Miles: You may deduct the cost of using your car to travel to medical appointments (doctors, dentists, hospitals). This rate is typically lower than the business rate as it covers variable costs (gas/oil) rather than fixed costs (depreciation).
Moving Miles: This deduction is currently limited to active-duty members of the Armed Forces who move due to a permanent change of station.
Charitable Miles: Miles driven in service of a qualified charitable organization are deductible. Unlike business and medical rates which are indexed to inflation, the charitable rate is set by statute at 14 cents per mile.
How to Calculate Your Deduction
The calculation logic used in the tool above follows the standard IRS formula:
(Business Miles × Business Rate) + (Medical Miles × Medical Rate) + (Charity Miles × Charity Rate) = Total Deduction
For example, if the 2025 business rate is 67 cents and you drive 10,000 miles for work:
10,000 miles × $0.67 = $6,700 Deduction
Documentation Requirements
To claim these deductions, the IRS requires timely and accurate records. Your mileage log should include:
The date of the trip.
The starting and ending location.
The business purpose of the trip.
The total miles driven.
Odometer readings (start and end).
FAQ: Federal Mileage Rates
Can I use the standard mileage rate if I lease my car?
Yes, but you must use the standard mileage rate for the entire lease period (including renewals) if you choose it in the first year.
Does the rate change during the year?
While usually set annually, the IRS can adjust rates mid-year if there are significant changes in fuel prices, as they did in 2022. This calculator allows you to input custom rates to account for such changes.
Can I claim parking and tolls?
Yes. Parking fees and tolls attributable to business use can be deducted separately in addition to the standard mileage rate deduction.