The IRS gives you two ways to deduct vehicle expenses. The standard mileage method uses a fixed rate per business mile. For 2024, that rate is 67 cents per mile. The actual expense method lets you deduct a percentage of your real vehicle costs based on how much you use the car for business. You can only use one method per vehicle per year.

The standard mileage method is simpler. Track your business miles, multiply by the IRS rate, and that’s your deduction. It covers gas, insurance, repairs, depreciation, and everything else rolled into one number. You can still deduct parking fees and tolls on top of the mileage rate if they’re business-related.

The actual expense method requires more work but can produce a larger deduction. You track all vehicle costs for the year including gas, insurance, repairs, oil changes, registration, lease payments, and depreciation if you own the vehicle. Then you multiply total expenses by your business use percentage. If you spent $12,000 on vehicle costs and drove 60% for business, your deduction is $7,200.

Determining business use percentage means tracking total miles and business miles for the year. Commuting from home to a regular office doesn’t count as business mileage. Driving from your office to meet a client does. Driving from home directly to a client site can count if your home is your principal place of business. The rules around what qualifies as business use are specific, so be careful with assumptions.

If you buy a new vehicle and want flexibility, start with the standard mileage method in the first year. You can switch to actual expenses in later years if that becomes more favorable. But if you start with actual expenses, you’re locked out of standard mileage for that vehicle permanently.

For expensive vehicles, the actual expense method often wins because depreciation is part of the calculation. A $60,000 truck used 70% for business generates significant depreciation deductions that the standard mileage rate doesn’t fully capture. For older vehicles with lower operating costs or high mileage drivers, the standard method might come out ahead.

Leased vehicles have different rules. You can use either method, but if you choose actual expenses, you may need to include a lease inclusion amount that reduces your deduction slightly. This applies to luxury vehicles and the thresholds change annually.

Documentation matters regardless of which method you choose. The IRS requires a contemporaneous log of business miles that includes the date, destination, business purpose, and miles driven. Apps like MileIQ or Everlance can run in the background and track this automatically. Reconstructing mileage at year end from memory doesn’t hold up in an audit.

If your business owns the vehicle outright rather than you personally, the accounting changes. The vehicle sits on the company balance sheet, all expenses flow through the business, and there’s no personal use calculation unless an owner or employee uses it personally. Personal use of a company vehicle creates taxable compensation that needs to be tracked and reported.

For construction and trades businesses in South Florida, vehicles are often among the largest deductible expenses. A plumber driving 25,000 business miles a year gets a $16,750 deduction at the standard rate without tracking a single gas receipt. That same plumber with a newer truck and high fuel costs might do better with actual expenses. Running the numbers both ways at year end tells you which method to elect.

The choice between methods is part of broader tax planning. Controller services in Boca Raton can help you analyze which approach makes sense for your situation and ensure you’re tracking everything correctly throughout the year rather than scrambling at tax time.