How to Track Business Mileage for Taxes (IRS Requirements 2026)

You're leaving money on the table.

If you drive for work—client meetings, errands, supply runs—you can deduct 67¢ per mile (2026 standard mileage rate).

Drive 5,000 business miles per year? That's a $3,350 deduction.

But here's the catch: The IRS requires a mileage log. No log = no deduction.

This guide explains IRS mileage requirements, what counts as business miles, and the easiest ways to track mileage without the hassle.

IRS Standard Mileage Rate (2026)

The IRS sets a standard mileage rate each year to cover:

• Gas
• Maintenance (oil changes, repairs)
• Depreciation
• Insurance

2026 rate: 67¢/mile (business use)

Other IRS mileage rates (2026):

• Medical/moving: 21¢/mile
• Charitable: 14¢/mile

You can deduct:

• Standard mileage: 67¢/mile for all business miles
• OR Actual expenses (gas, repairs, insurance, depreciation)

You CANNOT deduct both. Pick one method per vehicle per year.

What Counts as Business Mileage?

✅ Deductible Business Miles:

• Client meetings
• Errands to buy business supplies
• Travel to business events, conferences, networking
• Travel between two work locations (e.g., office to client site)
• Travel from home to temporary work locations
• Bank deposits, post office for business

❌ NOT Deductible:

• Commuting from home to your primary office (if separate location)
• Personal errands (grocery store, gym, personal appointments)
• Vacations (even if you "check email" once)

🏠 Home Office Exception:

If your home office is your principal place of business, there's no commuting—ALL business travel from home is deductible.

Example:

• Freelancer with home office → Drive to client meeting → Deductible
• Employee with separate office → Drive from home to office → NOT deductible

IRS Mileage Log Requirements

The IRS requires a contemporaneous mileage log with:

1. Date of Trip

When did you drive?

2. Destination

Where did you go?

3. Business Purpose

Why was this trip necessary for business?

4. Starting Odometer Reading

What was your odometer at the start of the trip?

5. Ending Odometer Reading

What was your odometer at the end of the trip?

6. Total Miles

How many miles did you drive?

Contemporaneous = recorded at or near the time of travel, not recreated later.

Example IRS-Compliant Mileage Log Entry

Business purpose detail matters. "Client meeting" is vague. "Meeting with client Sarah Jones to discuss web design project" is audit-proof.

How to Track Business Mileage (3 Methods)

Method 1: Manual Logbook (Old School, Audit-Proof)

Tools: Paper notebook, Excel spreadsheet, or Google Sheet

How it works:

• Record each trip manually: date, destination, purpose, odometer start/end, miles
• Keep logbook in your car or update nightly

Pros:

• Free
• IRS-compliant if done correctly
• No app subscriptions

Cons:

• Time-consuming (5-10 minutes/day)
• Easy to forget entries
• Manual math

Best for: People who make few business trips or prefer pen-and-paper tracking.

Download free mileage log template (PDF/Excel) →

Method 2: Built-In Mileage Tracking (Easiest)

CentSense includes built-in mileage tracking — log trips at the IRS standard rate ($0.70/mile for 2025), auto-calculated. No separate app needed.

Start tracking mileage in CentSense →

How it works:

• Log trips directly in CentSense alongside your expenses
• Auto-calculates deduction at the IRS standard rate
• Generates IRS-compliant reports

Pros:

• No separate app subscription
• Expense and mileage tracking in one place
• Auto-calculated deductions

Cons:

• Manual trip entry (no GPS auto-detection)
• Requires smartphone or web

Best for: Freelancers and self-employed professionals who want mileage + expense tracking without juggling multiple apps.

💡 Built-in mileage tracking: CentSense includes a mileage log that auto-calculates deductions at the IRS standard rate. Start free →

Method 3: Hybrid (Manual + App for Verification)

How it works:

• Use an app to auto-track miles
• Review and add business purpose notes weekly

Pros:

• Less manual entry than pure logbook
• Business purpose documentation (required for audit-proofing)

Cons:

• Still requires weekly review

Best for: Moderate business drivers who want automation + compliance.

Standard Mileage vs. Actual Expense Method

You must choose one method per vehicle per year.

Standard Mileage Method

How it works: Deduct 67¢/mile for all business miles.

Pros:

• Simple (just track miles)
• No need to save gas receipts or track repairs

Cons:

• May be less valuable than actual expenses (for high-maintenance vehicles)

Best for: Most freelancers and small business owners.

Actual Expense Method

How it works: Deduct actual costs (gas, oil, repairs, tires, insurance, depreciation) multiplied by business-use percentage.

Example:

• Total vehicle expenses: $8,000/year
• Business use: 60%
• Deduction: $4,800

Pros:

• May be higher deduction (for expensive vehicles or high repair costs)

Cons:

• Requires tracking ALL vehicle expenses (every gas receipt, repair bill)
• More complex depreciation calculations

Best for: Expensive vehicles with high operating costs.

How to Calculate Your Business Mileage Deduction

Step 1: Track All Miles

Use a logbook or app to record every business trip.

Step 2: Total Business Miles

Add up all business miles for the year.

Step 3: Multiply by Standard Rate

Business miles × $0.67 = Deduction

Example:

• 5,000 business miles
• 5,000 × $0.67 = $3,350 deduction

Step 4: Report on Schedule C

Line 9: Car and truck expenses

What If I Forgot to Track Mileage?

Option 1: Reconstruct the Log (Not Ideal)

The IRS prefers contemporaneous logs, but you can reconstruct a log using:

• Calendar entries (meetings, appointments)
• Emails/texts confirming client meetings
• Google Maps history (if location tracking enabled)
• Bank/credit card statements (showing where you were)

Warning: Reconstructed logs are less credible during audits. The IRS may disallow the deduction.

Option 2: Start Tracking Today

You can't deduct past miles without a log, but you can start tracking now and deduct remaining months.

Example:

• You forgot January-March
• Start tracking April-December
• Deduct April-December miles (better than nothing)

Common Mileage Deduction Mistakes

❌ Claiming Personal Miles

Only business miles are deductible. Don't claim grocery runs or vacations.

❌ No Business Purpose Documentation

"Meeting" isn't enough. Add names and project details.

❌ Forgetting Parking & Tolls

Business parking fees and tolls are deductible in addition to standard mileage (not included in the 67¢/mile rate).

❌ Using Estimated Miles

"I drove about 5,000 miles" won't hold up in an audit. The IRS wants a detailed log.

❌ Not Tracking January 1st Odometer

Record your odometer reading on January 1st and December 31st to calculate total miles driven (personal + business).

IRS Audit Red Flags for Mileage

The IRS scrutinizes mileage deductions. Red flags:

• Round numbers: "Exactly 5,000 miles" looks suspicious. Logs should have specific totals (e.g., 4,873 miles).
• 100% business use: Claiming your only vehicle is 100% business is rarely believable.
• No personal vehicle: If you deduct all miles as business, the IRS assumes you have no personal transportation (unlikely).
• No contemporaneous log: Reconstructed logs from memory are weak evidence.

Best Practices for Audit-Proof Mileage Logs

✅ Track Immediately

Log trips as they happen (or at the end of each day).

✅ Be Specific

Add detailed business purpose: "Meeting with client John Smith to finalize website contract."

✅ Keep Supporting Documents

Calendar invites, emails, receipts showing you were at the location.

✅ Separate Business and Personal

If you use one vehicle for both, track business miles carefully. Don't mix.

✅ Use Technology

Apps with GPS timestamps are more credible than handwritten logs.

Which Mileage Tracking Method Should You Use?

If you drive occasionally (< 50 business trips/year):

→ Manual logbook (free, simple)

If you drive frequently (50+ business trips/year):

→ CentSense ($5/mo) — built-in mileage tracking alongside expense tracking in one place

If you drive a LOT (delivery, Uber, mobile services):

→ CentSense ($5/mo) for mileage + expense management, or a dedicated GPS app for fully automatic trip detection

Start Tracking Mileage Today

The best time to start tracking mileage was January 1st. The second-best time is today.

Quick start:

1. Record today's odometer reading
2. Choose a tracking method (app or manual log)
3. Log your next business trip (destination, purpose, miles)
4. Review weekly to add missing trips

At 67¢/mile, every business trip counts.

Track expenses + mileage with CentSense →

Further Reading

• IRS Publication 463 (Travel, Gift, and Car Expenses)
• How to Track Business Expenses for Schedule C →
• 27 Tax Deductions for Freelancers →