1099-NEC Mileage Reimbursement: Box 1, Recovery, and Penalties

A mileage payment to an independent contractor goes in Box 1 of the 1099-NEC along with the rest of the compensation, unless the contractor adequately accounts for the travel to the payer and returns any excess. That single condition decides whether the reimbursement is taxable income to the contractor or invisible on the form. Most working arrangements never set up the accounting step, so the default result is that 1099-NEC mileage reimbursement is reported as ordinary non-employee compensation and the contractor claims the offsetting deduction on their own return.

When Mileage Stays Off the 1099-NEC

The IRS instructions for the 1099-NEC require Box 1 reporting of travel reimbursement “for which the nonemployee did not account to the payer.”¹ Publication 463 puts the flip side just as plainly: “If the contractor adequately accounts to you for reimbursed amounts, you don’t have to report the amounts on an information return.”²

Adequate accounting means the contractor submits contemporaneous records showing the date, destination, business purpose, and miles for each trip, the payer reimburses only the substantiated amount, and any excess advance is returned. That is a real administrative process, and it needs to exist before the payments go out, not reconstructed at year-end.

Very few payer-contractor relationships operate this way. When they don’t, the default rule applies.

The Default: Everything Lands in Box 1

When there is no adequate accounting, every dollar the payer sends counts as non-employee compensation, including the portion labeled as mileage. A $5,000 consulting fee plus a $1,000 mileage payment produces a 1099-NEC showing $6,000 in Box 1.¹ The form has no separate slot to segregate travel from services.

The $600 reporting threshold applies to the total of all payments during the calendar year. If service fees are $400 and mileage payments push the total to $650, a 1099-NEC is required. The obligation covers payments to individuals, partnerships, estates, and LLCs taxed as sole proprietorships or partnerships. Payments to C corporations and S corporations are generally exempt, with attorney fees the notable exception that must be reported regardless of entity type.¹

The form is due to both the contractor and the IRS by January 31 of the year after payment. Businesses filing 10 or more information returns of any type during the year must file electronically.³

How the Contractor Recovers the Tax

When mileage sits inside the 1099-NEC amount, the contractor offsets it by deducting vehicle expense on Schedule C, filed with Form 1040.⁴ The full 1099-NEC amount is reported as revenue, and the mileage deduction reduces taxable profit.

There are two methods:

Standard mileage rate. For 2026, the rate is 72.5 cents per business mile. It covers fuel, insurance, depreciation, and maintenance in one number. A mileage log is still required.⁵
Actual expense method. The contractor tracks fuel, oil changes, repairs, insurance, registration, and depreciation, then deducts the business-use percentage of the total.⁵

The choice has a lock-in. To use the standard mileage rate at all, you must have used it in the first year the vehicle was placed in service for business. Claiming depreciation or Section 179 on that vehicle in year one forces the actual expense method for the life of the vehicle. Leased vehicles must use the same method for the entire lease.

Which Miles Actually Count

Commuting from home to a regular work location is personal and never deductible. This is where audits do the most damage, because contractors often assume any drive tied to a client is a business drive.

If you have a regular office or work location and drive to a temporary site in the same trade, the entire round trip from home is deductible regardless of distance. If you have no regular workplace but ordinarily work within a metropolitan area, trips to temporary sites outside that metro area are deductible; trips within it are not.² Travel between two work locations on the same day is always deductible. Travel from home to a temporary site is deductible when your home office qualifies as your principal place of business.

Recordkeeping That Holds Up

A deduction without a log gets disallowed. Records must be contemporaneous, created at or near the time of the trip. Each entry needs the date, the starting point and destination with enough detail to verify the route, a specific business purpose such as “met with client to review project scope,” and the miles driven. Odometer readings should be recorded at the beginning and end of each tax year to establish total annual mileage.

Entries like “client meeting” with no destination or date are what trigger audit adjustments. The burden of proof sits entirely on the contractor.

Why the Accounting Question Matters: Self-Employment Tax

Reporting mileage as 1099-NEC income does more than raise income tax. It raises self-employment tax. Net Schedule C profit is subject to a combined 15.3%: 12.4% Social Security on earnings up to $184,500 in 2026, plus 2.9% Medicare with no cap.⁶

If a contractor receives $3,000 in mileage reimbursement that lands on the 1099-NEC and then deducts $3,000 in mileage on Schedule C, the income tax effect is zero. But if the method lock-in, missing records, or nondeductible commuting cuts into that deduction, the shortfall gets hit with both income tax and 15.3% self-employment tax. Keeping reimbursements off the form through adequate accounting avoids that exposure entirely.

Penalties on Both Sides

A business filing an incorrect 1099-NEC, or omitting one it should have filed, faces penalties under Section 6721 that scale with delay: $60 per form if corrected within 30 days of the due date, $130 per form if corrected by August 1, and $340 per form after August 1 or if never filed. Intentional disregard is $680 per form with no annual cap.⁷ A separate penalty of the same amount applies for failing to furnish a correct statement to the payee.³ Leaving the mileage portion out of a contractor’s Box 1 is underreporting, and the IRS treats that as an incorrect return.

On the contractor’s side, failing to pick up 1099-NEC income on the tax return triggers a 20% accuracy-related penalty on the underpaid tax. The IRS specifically flags omission of information-return income as negligent.⁸ Matching is automatic because the IRS receives its own copy of every form.

Backup Withholding If the W-9 Is Missing

If a contractor has not provided a taxpayer identification number on Form W-9, the payer must withhold 24% of every payment, including mileage reimbursements, and remit it to the IRS.⁹ The same rule applies when the IRS notifies the payer that a TIN on file is wrong. Withheld amounts are reported on Form 945, and the 1099-NEC still shows the full gross payment.¹⁰ Collecting a signed W-9 before the first check goes out prevents the whole problem.

1
Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (04/2025)
2
Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
3
Internal Revenue Service. Publication 1099 General Instructions for Certain Information Returns – For Use in Preparing 2026 Returns
4
Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship)
5
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents
6
Social Security Administration. Contribution and Benefit Base
7
Internal Revenue Service. Information Return Penalties
8
Internal Revenue Service. Accuracy-Related Penalty
9
Internal Revenue Service. Backup Withholding
10
Internal Revenue Service. Forms and Associated Taxes for Independent Contractors