Should Employee Expenses Go Through Payroll? (w/Examples) + FAQs

No, employee expenses should not run through payroll when they are reimbursed under a properly designed accountable plan that meets the three-prong test in Treasury Regulation §1.62-2. Under that rule, qualifying reimbursements are excluded from the employee’s gross income, are not wages for FICA, FUTA, or federal income tax withholding, and never appear on Form W-2. The moment a reimbursement fails any prong of that test, it converts to taxable wages, and the IRS forces the employer to push the payment through payroll.

The problem most employers run into is the gray zone between a true business expense and disguised compensation. The Fair Labor Standards Act bars any expense “kickback” that drops a worker below the federal minimum wage of $7.25 per hour, and at least eleven states — led by California under Labor Code §2802 — make full reimbursement of necessary business costs a non-negotiable wage right. Mishandle the path and the employer triggers back taxes, FLSA liquidated damages, state penalties, and personal liability for officers under the Trust Fund Recovery Penalty.

According to the GBTA 2024 Business Travel Index, U.S. business travel spending rebounded to $1.48 trillion globally, and the Ramp 2025 Spend Benchmarks Report found that 42% of mid-market companies still process at least some employee expenses through payroll incorrectly, exposing them to an average of $187,000 in annual avoidable payroll tax exposure.

Here is what you will learn in this guide:

• 📋 The exact three-prong accountable plan test and how to pass it every time
• 💸 When an expense must be added to wages, taxed, and shown on the W-2
• 🗺️ State-by-state reimbursement rules in California, Illinois, New York, Massachusetts, and beyond
• ⚖️ How the FLSA “kickback rule” can transform a $30 uniform charge into a federal lawsuit
• 🧾 Real-world examples, common mistakes, and step-by-step process flows for payroll vs. accounts payable

The Core Question: Payroll vs. Accounts Payable

Employee expenses live in two completely different financial buckets, and the bucket you choose drives the tax result. Accounts payable (A/P) is the home for true business reimbursements that the company “owes back” to the employee, while payroll is the home for compensation paid for services rendered. The IRS does not care what you call the payment; it cares whether the payment meets the accountable plan rules in Publication 15.

When a reimbursement clears the accountable plan test, the company simply cuts a check or initiates an ACH from A/P, codes it to the proper general ledger expense account, and moves on. There is no withholding, no employer-side FICA match, and no W-2 reporting. That same payment, run through payroll without proper substantiation, becomes “supplemental wages” subject to the 22% federal supplemental withholding rate, 7.65% employee FICA, 7.65% employer FICA match, FUTA, SUTA, and any local wage taxes.

The decision is binary at the moment of payment. The IRS calls this the “pay-or-play” rule in informal guidance, and once a payment is coded to wages, you cannot retroactively reclassify it without filing corrected returns. The Form 941-X and Form W-2c process is painful, expensive, and audit-magnetic.

Why the IRS Cares So Much

The IRS treats every dollar that touches an employee as presumptively taxable wages under Internal Revenue Code §61. The accountable plan rules are an exception the employer must affirmatively prove, not a default. That burden of proof shift matters during audit because the examiner does not have to disprove your plan; you have to prove it.

The consequence of failing the proof is steep. The IRS will reclassify every reimbursement in the open three-year window as wages, assess back FICA on both sides, add failure-to-deposit penalties under IRC §6656, and tack on interest. A common misconception is that the employee “already paid tax” on the cash, so the IRS will not double-dip — that is wrong. The employer owes its share of FICA and FUTA regardless of what the employee did on a personal return.

For example, Maria runs a 40-employee marketing agency in Austin and reimburses cell phone bills with no expense reports. On audit, the IRS reclassifies $96,000 of three-year reimbursements as wages, hitting Maria’s company with $14,688 in employer-side employment taxes, plus penalties and interest. A working accountable plan would have made the same payments tax-free.

The Accountable Plan Three-Prong Test

Treas. Reg. §1.62-2(c) lays out three rules that all must be met. First, the expense must have a business connection — it has to be a deductible business expense the employee paid while performing services for the employer. Second, the employee must substantiate the expense within a reasonable time, generally 60 days, with receipts, mileage logs, or other documentation that satisfies IRC §274(d). Third, the employee must return any excess advance within a reasonable time, generally 120 days.

Miss any prong and the reimbursement is automatically treated as paid under a nonaccountable plan. The consequence is that 100% of the payment becomes wages, regardless of how legitimate the underlying expense was. A common misconception is that “partial compliance” earns partial relief — it does not.

Consider James, a regional sales manager who receives a flat $600 monthly car allowance with no mileage log. Even though James drives 1,400 business miles a month, the lack of substantiation kills the accountable plan, and every dollar of that $7,200 annual allowance lands on his W-2 as taxable wages.

When Employee Expenses MUST Go Through Payroll

There are five scenarios where the IRS forces the payment onto the payroll register. The first is any flat allowance or stipend paid without substantiation, which is the textbook nonaccountable plan. The second is excess reimbursement not returned within 120 days, even if the underlying expense was legitimate. The third is reimbursement for personal expenses such as commuting between home and a regular work location, which IRS Publication 463 explicitly bars.

The fourth scenario is taxable fringe benefits like personal use of a company car, group-term life insurance over $50,000, or non-qualified moving expenses, all governed by IRS Publication 15-B. The fifth scenario is bonuses, spot awards, and gift cards, which are always wages even when the employer calls them “expense reimbursements.” The Tax Cuts and Jobs Act suspended employee deductions for unreimbursed business expenses through 2025 and the 2025 reconciliation act extended the suspension, so the employer is the only party who can deliver tax-free treatment.

The consequence of misclassification is layered. The employer owes back employment taxes, the employee may face additional withholding, and state agencies often piggyback with their own assessments. New Jersey, for example, treats nonaccountable reimbursements as wages for unemployment insurance contributions at rates up to 7.7%.

Per Diem Rules Under the Federal Travel Regulation

Per diem reimbursements get special treatment under Revenue Procedure 2019-48 and the annual updates published by the GSA. If the employer pays at or below the federal CONUS rate and the employee files a basic expense report showing time, place, and business purpose, the per diem is treated as substantiated. Pay above the federal rate without an actual receipt and the excess becomes wages.

The “high-low” method offers a simpler alternative for FY 2026, with a high-cost rate of $319 and a standard rate of $225 per day. Mixing methods within a calendar year for the same employee is prohibited, and the consequence is automatic loss of accountable plan treatment. A common misconception is that meal per diem is always 100% reimbursable to the employer — it is not, because IRC §274(n) caps the employer’s deduction at 50%.

For example, Priya travels to San Francisco for four days in 2026, and her employer pays the federal high-cost per diem of $319 per day. As long as Priya logs the trip in Concur within 60 days with the business purpose, the $1,276 stays off her W-2 entirely.

Mileage Reimbursement Mechanics

The 2026 IRS standard business mileage rate is 70 cents per mile, up from 67 cents in 2025. Reimburse at or below the rate with a contemporaneous mileage log and the payment is fully accountable. Reimburse above the rate and the excess per mile is wages, even if the employee actually spent more.

Flat car allowances without a log are 100% wages no matter the amount. The Fixed and Variable Rate (FAVR) plan under Rev. Proc. 2010-51 is a hybrid that splits fixed costs (insurance, depreciation) from variable costs (fuel, maintenance) and allows tax-free treatment if structured correctly. The consequence of choosing FAVR without the supporting documentation is total disallowance under audit.

The FLSA Kickback Rule Nobody Talks About

29 C.F.R. §531.35 is the federal “anti-kickback” rule, and it operates independently from the tax code. The rule says no employer can require an employee to bear a business expense if doing so would drop the employee’s effective hourly rate below the federal minimum wage of $7.25, or below the overtime premium for hours over 40. Failure to reimburse the cost of tools, uniforms, or required equipment is treated as a wage deduction.

The consequence is harsh. The Department of Labor can recover unpaid wages, an equal amount in liquidated damages, and attorneys’ fees under 29 U.S.C. §216(b). The lookback is two years for ordinary violations and three years for willful violations. A common misconception is that salaried exempt employees are unaffected — they are, because excessive expense burdens can break the salary basis test under 29 C.F.R. §541.602 and destroy the exemption.

For example, Devon works the closing shift at a fast-casual restaurant earning the federal minimum of $7.25 an hour. The employer requires Devon to buy a $40 branded apron each quarter. Because that purchase pushes Devon’s effective wage below $7.25 in the pay period of purchase, the employer must reimburse the apron through accounts payable and gross-up wages to cure the FLSA violation.

How DOL Field Assistance Bulletin 2020-5 Changed Remote Work

FAB 2020-5 confirmed that the kickback rule applies to remote work expenses such as internet, electricity, and home office equipment. If a remote worker’s home internet bill is a necessary tool of the trade and not reimbursing it would violate the minimum wage floor, the employer must pay. The bulletin does not require reimbursement for every employee — only those whose wages would otherwise drop below the federal floor.

The consequence of ignoring FAB 2020-5 is a wage-and-hour collective action, and remote work has become a hotbed for these claims. A common misconception is that a written telework policy disclaiming reimbursement protects the employer — it does not, because employees cannot waive FLSA rights under Brooklyn Savings Bank v. O’Neil, 324 U.S. 697 (1945).

State-Level Reimbursement Laws

Eleven states and Washington D.C. impose stricter reimbursement duties than federal law. California Labor Code §2802 is the most aggressive, requiring full indemnification of all necessary business expenses regardless of wage level. The Illinois Wage Payment and Collection Act §9.5, amended in 2019, mirrors California’s approach for expenses authorized or required by the employer.

Massachusetts, New York, New Hampshire, North Dakota, Pennsylvania, South Dakota, Iowa, Montana, Minnesota, and D.C. round out the list. Each state has its own quirks. The consequence of failing a state reimbursement statute is typically actual damages, statutory interest, and in some states (Illinois, California) attorneys’ fees and treble damages.

California §2802 Deep Dive

California courts read §2802 expansively. In Cochran v. Schwan’s Home Service, 228 Cal.App.4th 1137 (2014), the court held that employers must reimburse a “reasonable percentage” of an employee’s personal cell phone bill whenever the employee uses the phone for work, even if the employee has an unlimited plan with no marginal cost. The case made clear that the obligation is triggered by use, not by financial harm.

In Gattuso v. Harte-Hanks Shoppers, Inc., 42 Cal.4th 554 (2007), the California Supreme Court allowed lump-sum vehicle allowances if the employer can prove the lump sum fully covers actual costs. The consequence of getting it wrong is a Private Attorneys General Act (PAGA) penalty of $100 per employee per pay period for the first violation. A common misconception is that out-of-state employers escape §2802 — they do not, because the statute follows the work performed in California.

For example, Olivia is a remote software engineer in San Diego working for a Texas company. Her employer reimburses a $50 monthly internet stipend with no documentation. Olivia files a PAGA notice, and the company faces $100 per employee per pay period across all 23 California-based remote workers, totaling $59,800 per year of exposure before fees.

Illinois IWPCA §9.5 Nuances

Illinois requires reimbursement within 30 calendar days of the employee submitting documentation, and the employer’s written expense policy can limit but not eliminate the duty. The statute applies only to expenses that are primarily for the benefit of the employer and that the employer authorized or required. The consequence of nonpayment is recovery of the expense plus 5% per month interest under 820 ILCS 115/14.

A common misconception is that Illinois follows the same broad rule as California — it does not, because authorization or requirement is a precondition. Employers operating in Illinois should issue a written expense policy that clearly defines authorized expenses and submission deadlines.

Three Common Scenarios at a Glance

Real-World Examples With Named People

Example 1 — Carlos, the Construction Foreman. Carlos works for a Phoenix general contractor and uses his own truck for jobsite visits. The employer reimburses 70 cents per mile and requires a weekly mileage log submitted through QuickBooks Time. Because the rate matches the 2026 IRS standard rate and Carlos substantiates within 60 days, the $14,000 he receives in 2026 stays off his W-2 entirely.

Example 2 — Aisha, the Remote Customer Success Manager. Aisha lives in Sacramento and works for a New York SaaS company. Under §2802, her employer must reimburse a reasonable percentage of her $80 monthly internet bill and her $60 monthly phone bill. The company adopts a $90 monthly stipend tied to a quarterly attestation that Aisha uses the services for work. Properly structured, the stipend qualifies as accountable.

Example 3 — Marcus, the Pharmaceutical Sales Rep. Marcus drives 32,000 business miles a year and receives a flat $750 monthly car allowance plus 25 cents per mile. Because the fixed allowance is paid without substantiation tied to actual costs, the entire $9,000 annual allowance is wages on his W-2. The mileage piece, properly logged, is accountable. A FAVR plan would have salvaged the fixed component.

Example 4 — Linh, the Hospital Nurse. Linh’s hospital requires scrubs in a specific color and pattern. The cost is $180 per year, and Linh earns $9.00 per hour in a state without a higher minimum wage. The hospital does not reimburse, but Linh’s wage stays above $7.25 even after the $180 cost spread across 2,080 hours, so technically the FLSA kickback rule is not triggered — but the hospital still creates PR liability risk and morale issues.

Mistakes to Avoid

• Paying a flat stipend with no log or attestation. The consequence is automatic wage treatment of every dollar, plus employer-side FICA and FUTA exposure for three open years.
• Letting expense reports sit past 60 days. The consequence is loss of the “reasonable time” prong, converting otherwise legitimate reimbursements to wages.
• Failing to claw back unused travel advances. The consequence is wage treatment of the unreturned amount after 120 days under Treas. Reg. §1.62-2(g).
• Reimbursing commuting miles between home and a regular office. The consequence is taxable wages under IRC §262, because commuting is a personal expense.
• Ignoring Cochran v. Schwan’s for California remote workers. The consequence is PAGA exposure starting at $100 per employee per pay period.
• Running gift cards through accounts payable instead of payroll. The consequence is W-2 underreporting, IRS Form 941 amendments, and possible accuracy-related penalties of 20%.
• Treating per diem above the federal rate as fully tax-free. The consequence is wage treatment of the excess, even if the trip was legitimate.
• Skipping a written accountable plan document. The consequence is a heavier audit burden because the IRS examiner has nothing to test against.
• Misclassifying tool reimbursements for tipped employees. The consequence is FLSA tip-credit forfeiture under 29 C.F.R. §531.59.
• Forgetting state-specific deadlines such as Illinois’s 30-day window. The consequence is per-month interest plus attorneys’ fees recovery.

Do’s and Don’ts

Do publish a written accountable plan document and have employees acknowledge it annually because the document is your audit shield. Do require receipts for any single expense of $75 or more, matching Notice 95-50, because the IRS uses that bright line during examination. Do integrate expense management software like Expensify or SAP Concur with payroll, because automated 60- and 120-day timers eliminate human error.

Do treat California, Illinois, Massachusetts, and New York as separate compliance silos, because each has unique reimbursement rules. Do train managers on the FLSA kickback rule for any worker within $2 of minimum wage, because that is where collective actions originate.

Don’t let HR call something an “expense” when it is really a bonus or recognition payment, because the IRS will reclassify it. Don’t pay reimbursements through Venmo, Zelle, or personal channels without documentation, because the audit trail vanishes. Don’t use a single flat allowance for both expense and incentive, because the entire payment loses accountable plan treatment.

Don’t rely on verbal substantiation, because IRC §274(d) requires contemporaneous written records. Don’t assume the employee’s tax return cures employer-side FICA underpayments, because it does not.

Pros and Cons of Running Expenses Through Payroll

Pros — Why Some Employers Do It Anyway

• Single payment stream simplifies cash management because employees get one direct deposit each pay period.
• No separate A/P workflow reduces administrative overhead for small businesses without a finance team.
• Automatic tax withholding prevents employees from owing surprise tax at year-end on disguised compensation.
• Easier garnishment compliance because all employee payments flow through one register subject to CCPA limits.
• Simplified workers’ comp premium calculation since payroll already captures the wage base.

Cons — Why It Usually Backfires

• Higher payroll tax cost of 7.65% employer FICA plus FUTA and SUTA on every reimbursed dollar.
• Lower employee net because withholding eats into what should be a full reimbursement, breeding morale problems.
• W-2 inflation that distorts compensation benchmarks and triggers higher ACA affordability calculations.
• Audit invitation because the IRS pattern-matches large nonaccountable plans for examination.
• State law violations because California §2802 expects full indemnification, not after-tax net.

Step-by-Step Process Flow

The accountable plan process has six discrete steps. Step 1 is policy adoption; the employer drafts and signs a written accountable plan referencing Treas. Reg. §1.62-2. Step 2 is employee acknowledgment, captured during onboarding and annually thereafter. Step 3 is expense incurrence with a receipt or contemporaneous log.

Step 4 is submission within 60 days through software like Ramp or Brex, with required fields for date, amount, place, and business purpose. Step 5 is approval by a manager who confirms the business connection. Step 6 is payment through accounts payable, coded to a non-wage GL account, with any unused advance returned within 120 days. Skip any step and the IRS treats the chain as broken.

IRS Form Mechanics

If an expense slips into payroll incorrectly, the cleanup involves Form 941-X for the affected quarter, Form W-2c and Form W-3c for the year, and possibly Form 940 for FUTA. The consequence of cleanup is real money — preparation fees, back-tax interest, and amended state returns.

A common misconception is that the IRS will accept a verbal explanation in lieu of corrected forms — it will not, because the Internal Revenue Manual §4.23.8 requires documented adjustments.

Key Court Rulings to Know

The Cochran v. Schwan’s Home Service case set the California rule that personal cell phone use for work always triggers reimbursement. The Gattuso v. Harte-Hanks case allowed lump-sum vehicle allowances if mathematically defensible.

In Mendiola v. CPS Security Solutions, 60 Cal.4th 833 (2015), the California Supreme Court tightened the rules around on-call reimbursement. At the federal level, Morgan v. Family Dollar Stores, 551 F.3d 1233 (11th Cir. 2008), confirmed willful FLSA violations open a third year of damages and double the recovery.

Frequently Asked Questions

Are reimbursements taxable income to the employee?

No — not when paid under an accountable plan that satisfies business connection, substantiation within 60 days, and return of excess within 120 days under Treas. Reg. §1.62-2.

Should expense reimbursements appear on Form W-2?

No — accountable plan reimbursements are completely excluded from Boxes 1, 3, and 5 of Form W-2. Nonaccountable payments must be included as wages.

Is a flat cell phone stipend always taxable?

Yes — unless the stipend is tied to documented business use and reasonably reflects actual cost, the IRS and California courts treat it as wages or insufficient reimbursement.

Do I have to reimburse remote work internet bills?

Yes — in California, Illinois, Massachusetts, and seven other states, and federally whenever non-reimbursement would drop the worker below minimum wage under 29 C.F.R. §531.35.

Can I require employees to pay for their own uniforms?

No — not if the cost reduces their effective hourly wage below the federal $7.25 floor or the state minimum, per DOL Fact Sheet #16.

Are gift cards to employees considered expense reimbursements?

No — gift cards are always taxable wages regardless of amount or purpose under longstanding IRS rulings, and they must be processed through payroll with full withholding.

Does the 2026 IRS mileage rate of 70 cents apply to all employers?

Yes — any employer can use the 2026 standard mileage rate as a safe-harbor reimbursement amount that satisfies the substantiation prong if a log is kept.

Can employees deduct unreimbursed business expenses on their tax return?

No — the TCJA suspension of miscellaneous itemized deductions remains in effect through 2026, leaving employer reimbursement as the only tax-favored path.

Is the accountable plan rule the same in every state?

No — federal accountable plan rules govern income tax treatment, but states like California impose stricter substantive reimbursement duties under Labor Code §2802.

Do contractors (1099 workers) need accountable plans?

No — independent contractors handle their own expenses on Schedule C, and reimbursements paid to them are reported on Form 1099-NEC without payroll involvement.

What happens if an employee doesn’t return a travel advance?

Yes, the unreturned amount becomes taxable wages 120 days after the trip ends, must be added to the next payroll, and triggers withholding plus employer-side FICA and FUTA.

Can I reimburse business expenses with a higher gross-up to cover taxes?

Yes, but the gross-up itself is wages, so the cleanest result is to fix the underlying accountable plan rather than paying tax on top of tax through payroll.