Reimbursing a Helper's Mileage: Accountable Plan Rules for Sole Proprietors (2026 Schedule C Guide)

Published: October 30, 2026 · Reading time: 10 min

TL;DR: If a helper drives their own car for your Schedule C business, the tax treatment turns first on whether they are your employee or a contractor, and that is a facts test, not a label. For an employee, an accountable plan keeps the mileage reimbursement out of wages if it has a business connection, adequate accounting within a reasonable time and return of any excess. A reimbursement at or below the standard mileage rate (72.5 cents through June 30, 76 cents from July 1, 2026) can stay out of wages. Anything above the rate is wages, and a reimbursement with no log or no plan is generally wages. A contractor who bills you for mileage is a different path with different reporting. The worked example: 295 miles across the June 30 and July 1 boundary reimburse at $219.51, and a flat 80 cents would pay $236.00, which is $16.49 over.

The first time a sole proprietor hires help, the payroll questions get the attention. The mileage question arrives later, as a text from the helper: "I drove 52 miles to the client's house yesterday, what do I put down?" What you do next decides whether the reimbursement is a clean business expense or a payroll problem.

This guide is for owners filing a Schedule C who have a helper, assistant or subcontractor using a personal car for the business. It covers federal tax only, and it focuses on the other person's car, the rules that govern the payment and the records you need from them.

Related reading: why a sole proprietor cannot reimburse themselves, client-reimbursed expenses and receipts, hiring a W-2 employee vs. a 1099 contractor and the worker classification guide.

First: Is Your Helper an Employee or a Contractor?

Everything else depends on this answer, and you do not pick it by writing "independent contractor" on an agreement. Publication 15 (2026) says:

"Generally, a worker who performs services for you is your employee if you have the right to control what will be done and how it will be done."

It adds:

"If an employer-employee relationship exists, it doesn't matter what it is called."

A helper who works your hours, follows your method and has no other clients looks like an employee. A helper who sets their own method, serves other clients and invoices you for a result looks like a contractor. Our classification guide walks through the evidence, and a CPA or EA should decide mixed facts.

Why it matters for mileage:

• Employee. You can reimburse business miles under an accountable plan, and the payment is not wages if the plan qualifies.
• Contractor. There is no payroll. The mileage is part of what you pay for their services, or a travel reimbursement they account for, and the 1099-NEC rules apply.

Calling the mileage a "contractor expense" does not fix a misclassified employee.

What a Sole Proprietor Can and Cannot Reimburse

You cannot reimburse yourself. A sole proprietor and the business are one taxpayer, so money you move to yourself is a draw, and your own trips are a line 9 deduction. Our reimbursement vs. deduction guide covers that, and nothing here changes it.

What this guide adds is the other half: when you have a real employee, you are a real employer, and a plan covering their expenses can exist. It never covers yours. Two consequences:

• You take on payroll reporting for the wages and any taxable excess described below.
• If the helper is a relative, Publication 463 (2025) says a per diem or car allowance does not by itself satisfy the adequate accounting requirement when the employer is the employee's spouse, sibling, ancestor or lineal descendant, among other relationships. The employee must be able to prove the expenses to the IRS. Take any family employee to a CPA or EA first.

The Three Accountable Plan Rules

Publication 15 (2026) states the test:

"To be an accountable plan, your reimbursement or allowance arrangement must require your employees to meet all three of the following rules."

"They must have paid or incurred allowable expenses while performing services as your employees."

"They must substantiate these expenses to you within a reasonable period of time."

"They must return any amounts in excess of substantiated expenses within a reasonable period of time."

The regulation behind it, 26 CFR 1.62-2, names these paragraph (d) business connection, paragraph (e) substantiation and paragraph (f) returning excess. The payoff, from Publication 15:

"Amounts paid under an accountable plan aren't wages and aren't subject to income, social security, Medicare, and FUTA taxes."

Business connection. The drive has to be for your business: shop to client, between job sites, to the supply store. Section 1.62-2(d)(1) covers expenses "allowable as deductions" that are incurred "in connection with the performance of services as an employee." A reimbursement for something that is not a deductible business expense fails this rule, and Publication 463 (2025) says such reimbursements "are treated as paid under a nonaccountable plan." That passage uses a meal example, but the principle carries to miles. The ordinary trip from home to where the helper normally reports is commuting, which is why the log below asks for a business destination and purpose.

Adequate accounting. The helper gives you a record made at or near the time of each trip. For miles, that is the log.

Return of excess. An excess is any amount paid that is more than the business expenses the helper accounted for. If you advance a lump sum, the helper returns what the log does not support.

Publication 15 (2026) gives a safe harbor for "reasonable":

"Generally, it is considered reasonable if your employees receive their advance within 30 days of the time they pay or incur the expenses, adequately account for the expenses within 60 days after the expenses were paid or incurred, and return any amounts in excess of expenses within 120 days after the expenses were paid or incurred."

These are safe harbors, not mandates. Other timing is judged on the facts.

Reimbursing at or Below the Standard Rate

The IRS standard mileage rates page lists these 2026 business rates:

Value each trip at the rate for the day it happened. Our 2026 mileage rate guide covers the split. Publication 15-B (2026) notes you may use the business mileage rate "to reimburse an employee for business use of a personal vehicle," and Publication 15 (2026) explains the effect:

"In these cases, your employee is considered to have accounted to you if your reimbursement doesn't exceed rates established by the federal government."

That covers the amount only. The same section continues: "Other than the amount of these expenses, your employees' business expenses must be substantiated (for example, the business purpose of the travel or the number of business miles driven)."

So: pay per business mile at or below the rate, collect a log with miles and purpose, and you do not need the helper's actual gas, insurance and depreciation. The rate is a ceiling for tax-free treatment, not a duty to pay that much.

Paying Above the Rate

Owners sometimes round up to 80 cents or pay a flat car allowance. Publication 463 (2025) covers the mileage version:

"If your allowance is more than the federal rate, your employer must include the allowance amount up to the federal rate under code L in box 12 of your Form W-2. This amount isn't taxable. However, the excess allowance will be included in box 1 of your Form W-2."

The split runs per mile and trip date: the portion up to the rate is not wages, and the portion over it is wages, with income tax withholding, social security, Medicare and FUTA. Section 1.62-2(h)(2)(i)(B) says the same of the part of a mileage allowance above the deemed-substantiated amount. Two cautions:

• Only the excess is taxable, and only when the plan otherwise qualifies. If the plan fails, everything is wages.
• A flat monthly allowance with no miles reported leaves nothing to substantiate, which is the no-log problem below.

Ask a CPA or EA how your payroll provider should report the excess.

No Plan, No Log: When Reimbursements Become Wages

Publication 15 (2026) states the consequence:

"Payments to your employee for travel and other necessary expenses of your business under a nonaccountable plan are wages and are treated as supplemental wages and subject to income, social security, Medicare, and FUTA taxes."

It treats an arrangement as nonaccountable if the employee is not required to substantiate timely, is not required to return unused advances, is paid regardless of whether business expenses are expected, or is paid a reimbursement that would otherwise have been wages. That last one catches "your pay is $1,000 a month, and $150 of it is car money." Two more points:

• A missed excess return converts only the excess. If the plan is otherwise accountable but the helper does not return unsubstantiated money in time, Publication 463 (2025) treats the amount over the substantiated expenses as nonaccountable, and 26 CFR 1.62-2(c)(2)(ii) says only the amounts not exceeding the substantiated expenses stay accountable.
• You cannot repair it later by asking for a log. Section 1.62-2(c)(3)(i) says an employee who receives payments under a nonaccountable plan "cannot compel the payor to treat the payments as paid under an accountable plan by voluntarily substantiating the expenses and returning any excess to the payor." The plan, with its log requirement, has to exist before the payment.

If the Helper Is a Contractor Who Bills Mileage

A genuine contractor invoices "$1,800 for the project plus mileage at 80 cents." There is no accountable plan and no W-2. Three questions follow.

What does the contractor report? Publication 463 (2025), in its independent contractor section, says:

"If you don't account to your client for these expenses, you must include any reimbursements or allowances in income."

A contractor who just bills mileage on an invoice includes it in income and separately deducts their own vehicle costs, the pattern our client-reimbursed expenses guide describes from the contractor's chair. What happens to the contractor's own return when they have accounted to you is a question for their CPA or EA.

What do you put on Form 1099-NEC? The Instructions for Forms 1099-MISC and 1099-NEC (the version on irs.gov dated 12/2026) list among box 1a examples:

"A fee paid to a nonemployee, including an independent contractor, or travel reimbursement for which the nonemployee did not account to the payer, if the fee and reimbursement total at least $2,000."

The same instructions say the minimum reporting threshold "increased to $2,000" for tax years beginning after 2025 (see our 1099-NEC threshold guide). Publication 463 (2025) adds, from the payer's side:

"If the contractor adequately accounts to you for reimbursed amounts, you don't have to report the amounts on an information return."

Read together, unaccounted mileage counts toward the $2,000 total and accounted mileage can stay off the form. Publication 463's passage on contractors who do not account still shows the older $600 figure and Form 1099-MISC, so rely on the 1099 instructions for the threshold. Whether a mileage line on an invoice is "adequate" accounting, and whether the helper is a contractor at all, are questions for a CPA or EA.

What do you deduct? Publication 463 (2025) says a client in this position can deduct the reimbursements "as payment for services if they are ordinary and necessary business expenses." Ask for the same log fields either way. It is your evidence of what you paid for.

Where You Deduct It on Schedule C

The sources answer this least directly. The Schedule C instructions (2025 edition) say:

• Line 26 is "the total salaries and wages for the tax year," so the taxable excess over the rate belongs there.
• Line 23 includes "Social security and Medicare taxes paid to match required withholding from your employees' wages" and "Federal unemployment tax paid," so the employer payroll taxes on those wages go there.
• Line 11 covers "payments to persons you do not treat as employees (for example, independent contractors) for services performed for your trade or business." A contractor's billed mileage can reasonably be kept with their other charges here. That is a reading, not an express rule.
• Line 9 is described as "the actual expenses of operating your car or truck," which reads as your own vehicle.

An accountable plan reimbursement for an employee's car is the gap. Publication 15 (2026) says it is not wages, so line 26 is the wrong home. Nothing in the current instructions settles it. The discontinued 2022 edition of Publication 535 said a sole proprietor deducts a travel reimbursement on line 24a, but the current line 24a instruction covers only lodging and transportation connected with overnight travel away from your tax home. Confirm the line with a CPA or EA and use the same one every year.

What the Helper's Mileage Log Must Show

Publication 463 (2025), in its table of what to record for transportation, lists for car expenses the date of the use of the car, the business destination, the business purpose and the mileage for each business use, plus the total miles for the year. It says a record prepared on a computer is considered adequate, and its sample worksheet (Table 5-2) has columns for date, destination, business purpose, odometer start and stop, and miles.

A template to hand your helper, plus the date they submit it:

Ask for the log inside the 60-day safe harbor. Stale logs are guesses. Our contemporaneous mileage log guide covers the habits.

Worked Example: Dana's Assistant Drives Across the June 30 Line

Dana is a sole proprietor home stager. Her assistant Marcus works her schedule, follows her checklists and has no other clients, so Dana and her CPA treat him as an employee. Dana's written accountable plan says Marcus logs business trips in his own car, submits the log within 60 days, and is reimbursed at the IRS rate for each trip date. These are his six summer 2026 trips from Dana's storage unit to client homes:

Marcus submits the log on July 31, within 60 days of the earliest trip. The totals, computed with node:

• First half: 38 + 52 + 44 = 134 miles × $0.725 = $97.15
• Second half: 41 + 63 + 57 = 161 miles × $0.76 = $122.36
• Standard rate total: 295 miles, $97.15 + $122.36 = $219.51
• Flat 80 cents: $107.20 + $128.80 = $236.00
• Over the rate: $10.05 + $6.44 = $16.49, and as a check $236.00 − $219.51 = $16.49

At the standard rate, Dana pays $219.51 against a log with dates, destinations, purposes and miles. If the plan meets the three rules, it is not wages. One rate all year would give $213.88 (72.5 cents) or $224.20 (76 cents), and neither is right because the trips straddle the change.

At a flat 80 cents, the payment is $236.00. Following Publication 463's allowance-over-rate example, $219.51 stays accountable and $16.49 is treated as wages.

With no log, even $219.51 is a nonaccountable reimbursement, which Publication 15 (2026) treats as wages, and handing Dana the log in October would not repair it under the regulation quoted above.

If Marcus were a contractor, suppose he invoices an $1,800 fee plus $236.00 of mileage, $2,036.00 in all. If he did not account to Dana for the travel, the 1099 instructions' fee-plus-reimbursement language puts the total above $2,000. If he did account, Publication 463 lets the $236.00 stay off the information return, and the $1,800 fee alone is below $2,000. The same invoice lands on both sides of the threshold, which is why the facts matter. The example makes no tax calculation for either side.

Common Mistakes

1. Calling a helper a contractor to avoid payroll. The facts decide, not the label.
2. Trying to reimburse yourself. An accountable plan covers an employee's expenses, not the owner's.
3. Paying a flat car allowance with no log. That is a nonaccountable plan, and the payments are wages.
4. Using one 2026 rate. Trips before July 1 and from July 1 have different rates.
5. Reimbursing the commute. Home to the usual workplace has no business connection.
6. Asking for the log after the money has gone out. The log requirement must exist before the payment.
7. Treating pay above the rate as tax-free. The part above the rate is wages.
8. Ignoring the $2,000 total on a contractor's invoice. Unaccounted travel counts toward it.

How CentSense Helps

CentSense keeps your own receipts and trips in one place:

• Scan fuel, parking and supply receipts with AI the day you pay, so the vendor, date and total are captured. The free tier includes 10 AI scans a month
• Log miles by date on the Solo plan ($5/month) with a destination and business purpose for each trip. CentSense's mileage export applies a single annual rate and does not apply the July 1, 2026 split (72.5 cents, then 76 cents) to each trip, so value each trip at the rate for its date
• On the Solo and Team plans, export your categorized expenses as CSV so your preparer can map them to Schedule C lines

CentSense tracks expenses and mileage. It does not run payroll, decide whether a helper is an employee or a contractor, or tell you which Schedule C line a reimbursement belongs on. Those are judgment calls for you and your CPA or EA.

Frequently Asked Questions

Can a sole proprietor run an accountable plan for a helper who drives their own car?

Yes, if the helper is your employee. Publication 15 (2026) says an accountable plan requires employees to meet three rules: the expenses must be paid or incurred while performing services as your employee, they must be substantiated to you within a reasonable period of time, and any excess over the substantiated amount must be returned within a reasonable period of time. Amounts paid under such a plan are not wages. The plan does not let you reimburse yourself, and it does not work for a worker who is really a contractor, because it is built around the employer-employee relationship. Whether your helper is an employee turns on the facts, not on the label, so confirm with a CPA or EA.

Can I reimburse my employee's mileage at the standard mileage rate without paying tax on it?

Generally yes, when the plan meets the accountable plan rules. Publication 15 (2026) says a reimbursement that does not exceed rates established by the federal government is treated as accounted for, but the business purpose and the number of business miles driven must still be substantiated. The IRS lists 72.5 cents per mile for January 1 to June 30, 2026 (IR-2025-128) and 76 cents per mile from July 1 (IR-2026-29). In the worked example, 134 miles in June at 72.5 cents plus 161 miles in July at 76 cents come to $97.15 plus $122.36, or $219.51. Miles that are really commuting, a missing log, or an unreturned excess can change the result, so confirm with a CPA or EA.

What happens if I pay my employee more than the standard mileage rate?

The part above the rate is treated as wages. Publication 463 (2025) says that when an allowance is more than the federal rate, the employer must include the amount up to the federal rate under code L in box 12 of Form W-2, which is not taxable, and the excess is included in box 1. In the worked example, a flat 80 cents for 295 miles is $236.00, which is $16.49 above the $219.51 computed at the rate for each trip date ($10.05 in the first half and $6.44 in the second). That $16.49 is wages, subject to income tax withholding and payroll taxes, but only if the plan otherwise qualifies. Ask a CPA or EA how your payroll provider should report it.

What if my helper never gives me a mileage log?

Then the payments are generally wages. Publication 15 (2026) says payments under a nonaccountable plan are wages subject to income tax withholding, social security, Medicare and FUTA taxes, and it treats an arrangement as nonaccountable if the employee is not required to substantiate expenses, or does not substantiate them timely, with receipts or other documentation. The regulation under section 62 adds that an employee cannot compel the payor to treat payments as accountable by voluntarily substantiating them after the fact. Missing records are therefore a payroll problem for you as well as a deduction problem for your helper. Ask a CPA or EA before you pay anything without a log.

If a contractor bills me for mileage, do I have to put it on a Form 1099-NEC?

It depends on whether the contractor accounted to you for the travel and on the total. The Instructions for Forms 1099-MISC and 1099-NEC list among the payments to report in box 1a a fee paid to a nonemployee, or travel reimbursement for which the nonemployee did not account to the payer, if the fee and reimbursement total at least $2,000, and they say the threshold increased to $2,000 for tax years beginning after 2025. Publication 463 (2025) says that if the contractor adequately accounts for reimbursed amounts, you do not have to report them on an information return. In the worked example, a $1,800 fee plus $236.00 of unaccounted mileage totals $2,036, while the $1,800 fee alone is below $2,000. The classification of the worker and the adequacy of the accounting are fact questions, so ask a CPA or EA.

Where does a mileage reimbursement go on my Schedule C?

The current Schedule C instructions do not name a line for an accountable plan reimbursement of local mileage. The Schedule C instructions describe line 26 as salaries and wages, line 23 as including employer social security and Medicare taxes and federal unemployment tax, and line 11 as payments to people you do not treat as employees for services. Publication 15 (2026) says accountable plan amounts are not wages, so line 26 is the natural home for the taxable excess rather than for the reimbursement itself, and a contractor's billed mileage that you pay can reasonably be kept with the contractor's other charges on line 11. The 2022 edition of Publication 535, which the IRS has since discontinued, said a sole proprietor deducts a travel reimbursement on line 24a of Schedule C, but the current line 24a instruction is limited to lodging and transportation connected with overnight travel away from your tax home, so the line for local mileage reimbursed under a plan is unsettled. Confirm which line to use with a CPA or EA before you file.

What does my helper's mileage log need to show?

Publication 463 (2025) lists, for car expenses, the date of the use of the car, your business destination, the business purpose, and the mileage for each business use, plus the total miles for the year. It also says you should keep the record in a log, account book, diary or similar record, and a record prepared on a computer is considered adequate. Under an accountable plan the helper gives that record to you, the payer, within a reasonable period of time. A line like client meeting is thin, so name the client or the job. Home-to-work commuting miles do not belong in the log, because they are not deductible business travel. Confirm your own facts with a CPA or EA.

Authoritative References

• IRS: Publication 15 (2026), Employer's Tax Guide (employee business expense reimbursements; common-law employees)
• IRS: Publication 15-B (2026), Employer's Tax Guide to Fringe Benefits
• IRS: Publication 463 (2025), Travel, Gift, and Car Expenses (chapters 5 and 6)
• IRS: Publication 535, Business Expenses (discontinued; last revision 2022)
• IRS: Instructions for Schedule C (Form 1040), 2025
• IRS: Instructions for Forms 1099-MISC and 1099-NEC
• IRS: Standard mileage rates (2026: 72.5 cents Jan 1 to Jun 30 per IR-2025-128; 76 cents Jul 1 to Dec 31 per IR-2026-29)
• 26 CFR 1.62-2, Reimbursements and other expense allowance arrangements

Stop guessing at the rate on each trip. Start a free CentSense account, scan each receipt with AI the day you pay, log your own trips with their purpose, and export a CPA-ready breakdown at tax time. The free tier includes 10 AI receipt scans a month, and the Solo plan ($5/month) adds unlimited scans, mileage tracking and CSV export.

This guide is general education for U.S. sole proprietors filing a Schedule C in 2026 who reimburse a helper's vehicle mileage. It is not personalized tax advice. Whether a helper is an employee or a contractor, whether your arrangement is an accountable plan, how a reimbursement is reported, and which Schedule C line applies depend on your facts, so confirm them with a CPA or EA before you pay or file.