Business and personal driving in 2026: separate the miles

Across Greater Houston—where client visits, job sites, supplier pickups, and bank errands can easily span dozens of miles a day—vehicle expenses are often one of a small business's largest operating deductions. They are also one of the first items examined when a return is reviewed, because passenger vehicles are generally treated as "listed property" subject to strict substantiation rules under Internal Revenue Code Section 274(d) and IRS Publication 463 (Travel, Gift, and Car Expenses).

Whether you use the IRS standard mileage rate or actual vehicle expenses in 2026, only the business-use portion of your driving is deductible, and an end-of-year estimate is not enough to substantiate the deduction.

1. Commuting is generally personal driving, not business mileage

Under IRS Publication 463, daily transportation between your home and your regular place of work (such as a storefront, clinic, warehouse, or office) is considered personal commuting—even if you take business phone calls during the drive or display a company logo on the vehicle.

By contrast, trips that commonly qualify as business mileage when properly documented include:

• Driving from your regular office or shop to a client site, project location, supplier, or bank
• Travelling between two different business locations during the workday
• Driving from home to a temporary work location outside the metropolitan area, or to a temporary work location when you have one or more regular work locations away from home
• Driving from a qualifying home office that meets the principal-place-of-business tests under IRS Publication 587 (Business Use of Your Home) to client sites or other business locations in the same trade or business

2. The four facts your 2026 mileage log must record

Both the standard mileage method and the actual expense method require a contemporaneous mileage record that establishes your business-use percentage for the year:

1. Date of each trip
2. Destination or route (city, neighborhood, or site address)
3. Business purpose (client name, job number, supplier pickup, or specific meeting objective)
4. Miles driven for each business stop, plus your vehicle's beginning-of-year (January 1, 2026) and end-of-year (December 31, 2026) odometer readings so total annual miles can be verified

Without total odometer miles for the full year, you cannot prove the ratio of business miles to total miles—which is required even if you deduct actual fuel, insurance, repairs, and depreciation instead of the standard mileage rate.

3. Keep actual vehicle receipts even if you track mileage

Before choosing between the standard mileage rate and actual expenses on your 2026 return, check how the vehicle was deducted in the first year it was placed in service for business. As explained in IRS Topic No. 510 (Business Use of Car), if you want the option to use the standard mileage rate for an owned vehicle, you generally must choose it in the first year the car is available for business use; if you claimed actual expenses, MACRS depreciation, Section 179, or bonus depreciation in year one, you generally must continue using actual expenses for that vehicle.

Reconciling fuel, maintenance, insurance, and registration inside your monthly bookkeeping alongside a digital mileage log ensures your preparer has both sets of numbers ready at filing time.

Tax N Tips helps Houston business owners and 1099 contractors with tax planning, monthly bookkeeping, small-business payroll, individual and business tax preparation, and ITIN assistance across all services. Book a free consultation to review your 2026 vehicle and equipment records.

Sources checked November 2, 2026: IRS Publication 463 (Travel, Gift, and Car Expenses), IRS Topic No. 510 (Business Use of Car), and IRS Publication 587 (Business Use of Your Home).