A 1099 for reimbursed expenses is only required when the contractor failed to account for those expenses. If your independent contractor gave you receipts, dates, amounts, and a clear business purpose for every dollar you paid back, the reimbursement stays off Form 1099-NEC. If they didn’t, the entire reimbursement gets added to their service fees and reported in Box 1 as ordinary nonemployee compensation.1Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (Rev. April 2025)
The 1099-NEC instructions put it plainly: a reportable payment includes “a fee paid to a nonemployee, including an independent contractor, or travel reimbursement for which the nonemployee did not account to the payer.” That phrase, “did not account to the payer,” decides the whole question. IRS Publication 463 calls this framework adequate accounting, and it’s the contractor-side parallel to the accountable-plan rules that apply to employees.2Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
What Adequate Accounting Requires
Three conditions have to hold for a reimbursement to stay off the 1099.
- Business connection. The expense relates directly to the work the contractor performs for you. A flight to your office for a project meeting qualifies. Home office furniture generally does not, even for a remote worker.
- Adequate substantiation. The contractor gives you enough detail to identify the business nature of each expense: amount, date, location, and business purpose, backed by receipts or contemporaneous records. For travel, that means a log showing where the contractor went and why. The IRS treats substantiation provided within 60 days of the expense as timely.3Internal Revenue Service. Revenue Ruling 2003-106
- Return of excess amounts. If you advanced funds or reimbursed more than the documented expenses, the contractor returns the difference. An arrangement that lets the contractor keep unsubstantiated amounts fails on its face.2Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
You, as the payer, carry the burden of enforcement. If your reimbursement arrangement doesn’t require substantiation, or if the contractor never actually submits receipts and you keep paying anyway, the arrangement has failed. Every dollar of reimbursement then becomes reportable compensation.
Hold the substantiation the contractor provides for at least three years from the filing date of the return that reports the payment.4Internal Revenue Service. How Long Should I Keep Records?
When the Reimbursement Has to Go on the 1099-NEC
When adequate accounting fails, the reimbursement is treated as nonemployee compensation. The usual failures: the contractor never submits receipts, the arrangement never required documentation in the first place, or the contractor pockets amounts that exceed what was substantiated. Any one of those failures converts the whole reimbursement into reportable income.
Combine the reimbursement with what you paid the contractor for services and put the total in Box 1 of Form 1099-NEC. For tax year 2026, a 1099-NEC is required once total payments to a contractor reach $2,000 or more during the year.5Internal Revenue Service. General Instructions for Certain Information Returns – 2026 Returns (Draft) That threshold looks at service fees plus any unaccounted-for reimbursements together.6Internal Revenue Service. Reporting Payments to Independent Contractors
You cannot split the form to segregate the reimbursement from the fee. Once the arrangement fails, Box 1 shows one lump number. The contractor deducts the underlying expense on their own return.
Mileage, Per Diem, Materials, and Fixed Allowances
A few reimbursement categories come up over and over in contractor relationships. The framework is the same, but the details vary.
Mileage and Per Diem
You can reimburse at the IRS standard mileage rate (72.5 cents per mile for 2026) or at GSA per diem rates for lodging and meals without collecting a receipt for every gallon or restaurant tab.7Internal Revenue Service. Standard Mileage Rates Updated for 2026 The standard rate handles the dollar-amount side of substantiation. The contractor still needs to document the date, destination, and business purpose. “Drove 180 miles to client site in Dallas for project walkthrough on March 12” works. A flat monthly car payment with no log does not.
Reimburse above the standard rate and the excess has to be returned; otherwise it lands on the 1099. Paying $1.00 per mile when the IRS rate is 72.5 cents means the contractor returns the extra 27.5 cents per mile, or that overage hits Box 1.
Materials and Supplies
Buy materials directly from a vendor and there’s no reimbursement to the contractor at all, so nothing to report on the contractor’s 1099. You may owe a separate 1099 to the vendor if the payment meets that reporting threshold.8Internal Revenue Service. Am I Required to File a Form 1099 or Other Information Return? When the contractor buys the materials and you pay them back, the standard rules apply: receipts keep the reimbursement off the 1099, no receipts and the whole amount goes in Box 1.
Fixed Allowances
A flat periodic payment for general expenses, say $500 a month for “office costs” with no receipt requirement, fails adequate accounting by construction. There’s no substantiation and no way to identify excess. Report fixed allowances as compensation in Box 1.
Why Both Sides Should Care About Getting This Right
When unaccounted-for reimbursements land in Box 1, the contractor reports the full amount as gross income on Schedule C. That inflates both income tax and self-employment tax, which runs 15.3% (12.4% Social Security on earnings up to $184,500, plus 2.9% Medicare on all earnings).9Social Security Administration. Contribution and Benefit Base
The contractor offsets the extra income by deducting the actual expenses on the same Schedule C. Someone who received a 1099-NEC for $25,000, including $3,000 in unaccounted-for travel reimbursements, would report $25,000 in gross receipts and deduct $3,000 in travel expenses, assuming they kept the receipts. Net taxable income is unchanged.
The trap: a contractor who didn’t substantiate expenses to you probably isn’t keeping tidy records for their own return either. Without documentation they can’t take the deduction, so they end up paying income tax and self-employment tax on money that only reimbursed out-of-pocket costs. Getting the arrangement right at the start is cheaper for everyone.
Corporate Contractors and Payments Through Platforms
Two situations take the reimbursement question off the table because no 1099-NEC is issued in the first place.
You generally do not issue a 1099-NEC to a contractor operating as a C-corporation or S-corporation, including an LLC that has elected corporate tax treatment. The main exception is payments for legal services, which are reportable on 1099-NEC regardless of the attorney’s entity type.1Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (Rev. April 2025) Collect a W-9 up front so you know which classification applies.
Payments made through a credit card, PayPal, Venmo, or another third-party payment processor are typically not reported on a 1099-NEC. The processor handles the reporting on Form 1099-K. When a payment is reportable under both regimes, it goes on the 1099-K only.10Internal Revenue Service. Form 1099-K FAQs – Third Party Filers of Form 1099-K Checks, ACH, cash, and wires stay your responsibility to report.
Fixing a 1099 That Got Reimbursements Wrong
If you filed a 1099-NEC that incorrectly included a properly accounted-for reimbursement in Box 1, or that left out an unaccounted-for reimbursement, file a corrected 1099-NEC. Paper corrections follow the procedures in the General Instructions for Certain Information Returns; electronic corrections can go through the FIRE system or the IRIS portal. Do not check the “VOID” box on a paper correction, because that tells IRS scanning equipment to skip the form entirely.11Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (04/2025)
Move quickly. The IRS matches 1099 figures against what the contractor reports on Schedule C, and a mismatch draws audit attention on both ends.