- The single policy decision that determines tax treatment
- The three-part accountable plan test
An expense reimbursement policy decides how much tax your business and your employees pay on every dollar you reimburse. Done right, the reimbursement is tax-free to the employee and fully deductible to the business. Done wrong, the same dollar becomes taxable wages - costing the employee income tax and FICA, and costing the business another 7.65% in employer payroll tax. This page walks through how to get it right.
How we verified this Every rule on this page is sourced from the IRC (Sections 62, 162, 274), Treasury Regulation 1.62-2, current IRS publications (Pub 463, Pub 535, Notice 2025-54 for per diem, Notice 2026-10 for mileage), and IRS instructions for accountable plans.
Key Takeaways
- The IRS recognizes two reimbursement structures: accountable plans (tax-free to employee, deductible to employer) and non-accountable plans (taxable wages, also deductible to employer).
- An accountable plan must meet three tests: business connection, substantiation, and return of excess - per Treasury Reg 1.62-2.
- Employees must substantiate expenses within a reasonable time (typically 60 days) and return any excess within 120 days, or the entire arrangement becomes non-accountable.
- The 2026 business mileage rate is 72.5 cents per mile, per IRS Notice 2026-10.
- The 2025-2026 special per diem rates are $319/day in high-cost localities and $225/day in other CONUS locations, per IRS Notice 2025-54.
- Receipts are required for expenses of $75 or more, except lodging, where receipts are always required, per IRC Section 274(d).
The single policy decision that determines tax treatment
When an employer reimburses an employee for a $200 business meal, the IRS asks one structural question: was the reimbursement made under an accountable plan?
- Yes: The $200 is tax-free to the employee. The employer deducts the reimbursement as a business expense (subject to the 50% meal limit). No payroll tax on either side.
- No: The $200 is added to the employee's W-2 Box 1 as wages. The employee owes income tax and 7.65% FICA. The employer owes another 7.65% in payroll tax. The employer still deducts the $200 as wages.
The dollar amount is identical. The tax outcome is very different. For a $50,000/year in reimbursable expenses, that 15.3% payroll wedge alone is $7,650 per year in payroll taxes that disappear if the plan is structured correctly.
The three-part accountable plan test
Treasury Reg 1.62-2 sets three tests. All three must be satisfied for reimbursements to be tax-free.
Test 1: Business connection
The expense must be paid or incurred by an employee in connection with services performed for the employer. The expense must qualify as a deductible business expense - meaning it must be ordinary and necessary under IRC Section 162.
In practical terms: reimbursing an employee for their gym membership fails this test (not deductible business expense). Reimbursing them for a client lunch passes.
Test 2: Substantiation within a reasonable time
The employee must substantiate the expense within a reasonable time. Substantiation means proving:
- Amount (cost)
- Time (date)
- Place (location)
- Business purpose (why it relates to the employer's business)
For travel, meals, gifts, and listed property (vehicles, certain electronics), IRC Section 274(d) sets a higher substantiation bar with stricter receipt requirements.
The IRS defines "reasonable time" in Treasury Reg 1.62-2(g) with a safe harbor:
- Expenses substantiated within 60 days of being paid or incurred = reasonable
- Excess advances returned within 120 days of being paid or incurred = reasonable
Plans that meet these timeframes are automatically considered to satisfy the reasonable-time requirement. Plans that miss them must affirmatively prove what they did was reasonable - a harder argument to win in audit.
Test 3: Return of excess
Any reimbursement or advance in excess of substantiated expenses must be returned to the employer within a reasonable time. If the employee keeps the excess, the entire excess becomes taxable wages.
Practical example: the employer advances $1,000 for a business trip. The employee returns with receipts totaling $750. The employee must return $250 within 120 days. If they do not, the $250 (not the full $1,000) becomes wages.
What an accountable plan looks like in practice
The three tests sound abstract. The implementation is concrete:
- A written policy - not required by statute but strongly recommended as evidence the plan exists.
- An expense report process - employee submits receipts, business purpose, amount, date, and place within 60 days.
- A reimbursement workflow - finance approves and pays within a reasonable period.
- A return-of-excess mechanism - if any advance was given, unused funds come back within 120 days.
A simple expense report template that captures the four substantiation elements is usually enough. Most accounting platforms (QuickBooks, Xero, Expensify, Brex, Ramp) handle this natively. The form does not have to be elaborate; it has to be consistent.
Quick comparison: accountable vs non-accountable plans
| Factor | Accountable Plan | Non-Accountable Plan |
|---|---|---|
| Tax to employee | None | Income tax + 7.65% FICA |
| Payroll tax to employer | None | 7.65% FICA on reimbursement |
| W-2 reporting | Not reported as wages | Box 1 wages |
| Employer deduction | Yes (subject to meal/entertainment limits) | Yes (as wages) |
| Required documentation | Receipts, business purpose, dates | None required by IRS |
| Setup formality | Three-part test must be met | None |
| Best for | Any employer reimbursing business expenses | Almost no one (informational only) |
In nearly every case, accountable is better for both sides. Non-accountable is what your plan becomes by default when you do not set up an accountable one - not a plan most businesses choose deliberately.
What expenses can be reimbursed under an accountable plan
The expense must be ordinary and necessary under IRC Section 162 and incurred in performing services for the employer. Common categories:
- Mileage at the IRS standard rate (72.5 cents/mile for 2026) or actual auto expenses
- Business travel including airfare, hotels, ground transportation
- Business meals while traveling or with clients (50% deductible to employer)
- Tools, equipment, and small assets required for the job
- Cell phone business-use portion if the employee uses a personal phone
- Home office costs for fully remote employees (mostly state-mandated, not federal)
- Professional development and continuing education required by the role
- Subscriptions to industry tools and publications
Expenses that cannot be reimbursed tax-free, even under an accountable plan:
- Commuting between home and a regular workplace
- Personal items even if used at work (everyday clothing, lunch when not traveling)
- Entertainment - disallowed for the employer under post-2017 rules
- Spousal travel unless the spouse has a bona fide business purpose
- Country club, gym, or social club dues for general use
Mileage reimbursement: the most common reimbursement
The IRS standard mileage rate is the simplest accountable-plan mechanism for vehicle reimbursement. Pay employees the 2026 rate of 72.5 cents per mile, require a mileage log with date / destination / business purpose / miles, and the reimbursement is automatically substantiated.
If the employer reimburses less than the IRS rate, the employee may deduct the difference (subject to the TCJA suspension for W-2 employees through 2025, so currently no employee deduction for the gap). If the employer reimburses more than the IRS rate, the excess is wages.
The mileage log requirement is non-negotiable. Publication 463 requires contemporaneous records - meaning kept at or near the time of the trip, not reconstructed at year-end.
Apps that satisfy this for free or low cost include MileIQ ($5.99/mo), Stride (free), and most expense tracking platforms. See our best expense tracking apps for freelancers guide for the picks, most of which work for employee reimbursement too.
For deeper detail on mileage logs and the 72.5-cent rate, see how to track mileage for business.
Per diem reimbursement: the simpler travel option
Instead of reimbursing actual travel expenses, employers can use per diem rates to reimburse meals, lodging, and incidentals when employees travel.
IRS Notice 2025-54 sets the 2025-2026 special per diem rates:
- High-cost localities: $319 per day total ($86 for meals)
- All other CONUS locations: $225 per day total ($74 for meals)
Per diem reimbursements satisfy the substantiation requirement automatically when:
- The amount is paid for travel away from the tax home
- The amount does not exceed the federal per diem rate for the locality
- The employee submits an expense report showing the time, place, and business purpose of the travel
Receipts are not required for per diem amounts within the federal rate. The employee still has to log the trip itself.
When per diem is the right choice:
- Travel-heavy roles where collecting individual receipts is impractical
- Standardized client visits where per diem covers actual costs reasonably
- Smaller businesses without a strong T&E process
When actual reimbursement is better:
- High-cost cities where actual costs routinely exceed per diem
- Roles with lodging costs that vary widely
- Owners who want every dollar tracked individually for budgeting
The $75 receipt rule
IRC Section 274(d) requires receipts for:
- Lodging always, regardless of amount
- Other expenses of $75 or more
For expenses under $75 other than lodging, a receipt is not legally required - but a record of the date, amount, place, and business purpose is still required. Most accountable plans require receipts for everything anyway because the marginal cost of mobile receipt capture is zero, and it eliminates ambiguity in audit.
The $75 threshold has not been updated for inflation since the IRS set it in Rev. Proc. 95-50. At 2026 prices, $75 is a low threshold - most business lunches and casual purchases qualify.
How S corp owners use accountable plans
S corporation owner-employees cannot deduct home office expenses, mileage, or cell phone business use directly on a personal return. The correct path is an accountable plan reimbursement from the S corp.
The mechanics:
- Adopt an accountable plan as a written policy of the S corp.
- Calculate eligible expenses monthly or quarterly: home office percentage, business mileage at IRS rate, business cell-phone percentage.
- Submit an expense report to the S corp.
- The S corp reimburses the owner within a reasonable time (60 days is the safe harbor).
- The S corp deducts the reimbursement as a business expense.
- The owner receives the reimbursement tax-free - no W-2 reporting, no income tax, no payroll tax.
The annual savings on a typical setup (home office at 10% of home expenses, business mileage of 5,000 miles, half of cell phone) is often $3,000-$6,000 in tax. Most S corp owners under-use this because it requires setting up the policy and running monthly substantiation - both of which are an hour of work, not a structural project.
For the home office side specifically, see our home office expense deduction guide.
State-mandated reimbursement laws
Federal law does not require employers to reimburse business expenses. Several states do.
- California: Labor Code Section 2802 requires reimbursement of all "necessary expenditures or losses" incurred by employees in performing duties. This covers home office costs for remote workers, personal cell phone business use, and required tools.
- Illinois: 820 ILCS 115/9.5 requires reimbursement of "all necessary expenditures or losses incurred by the employee within the employee's scope of employment."
- Massachusetts, Pennsylvania, New York, New Hampshire, North Dakota, South Dakota, Iowa, Montana, Minnesota, and the District of Columbia also have reimbursement-related statutes, with varying scope.
If your employees are in these states, the accountable plan structure is doing double duty: meeting the federal tax-free reimbursement test and satisfying a state legal requirement. Skipping the plan is not just a tax cost; it can be a labor-law violation.
Sample policy structure
A working accountable plan policy needs five sections. The exact wording is less important than the structural completeness.
Section 1: Eligible expenses. Define the categories the company will reimburse. Reference IRS guidance for travel, meals, and mileage. Exclude personal expenses explicitly.
Section 2: Reimbursement rates. Specify per-mile reimbursement (IRS standard rate), per diem amounts (federal rates), and dollar caps for hotels, meals, and incidentals if applicable.
Section 3: Documentation requirements. Require receipts for all expenses (the simple rule beats the $75 threshold for clarity). Require the date, amount, place, and business purpose for every expense.
Section 4: Timing. Require expense reports within 30-60 days of the expense. Require return of unused advances within 120 days. State that reports submitted late may be reimbursed at the company's discretion but may be treated as non-accountable.
Section 5: Approval workflow. Identify the approver (direct manager, finance) and the maximum approval level. Require that approvers verify business purpose, not just the dollar amount.
This is the practical minimum. Larger organizations layer on travel-booking requirements, preferred vendors, and category-specific caps. The core structure does not change.
Our annual cost-of-error calculation
To illustrate the real money at stake in plan design, here is a worked example for a small business that reimburses $50,000/year in employee business expenses.
| Scenario | Annual Expense Reimbursement | Employer Payroll Tax Cost | Employee Take-Home Reduction | Total Cost of Wrong Plan |
|---|---|---|---|---|
| Accountable plan, set up correctly | $50,000 | $0 | $0 | $0 (baseline) |
| Non-accountable (treated as wages) | $50,000 | $3,825 (7.65% FICA) | ~$12,500 (25% combined) | $16,325 destroyed annually |
| Mixed: some not substantiated | $50,000 | ~$1,500 partial | ~$5,000 partial | ~$6,500 destroyed annually |
The math is consistent at every scale. A two-hour policy setup beats a $16,000+ tax leak annually for a small business with modest reimbursement volume.
When non-accountable plans actually make sense
There are narrow cases where a non-accountable plan is intentional, not accidental:
- Flat monthly stipends for cell phone, internet, or home office that the employer does not want to administer with monthly substantiation. The stipend is wages; the simplicity is the tradeoff.
- Travel allowances paid as a fixed weekly amount regardless of actual travel. Usually wages.
- Tool allowances in trade professions where the employee already owns the tools and the employer reimburses a fixed annual amount.
In each case, the employer is choosing to convert reimbursement into compensation. That is a defensible choice when administrative simplicity matters more than the payroll-tax wedge - but it should be deliberate, not accidental.
When this guide isn't for you
This page is built for U.S. employers reimbursing W-2 employees and S corp owners reimbursing themselves. The accountable plan structure is U.S. tax law.
Skip this guide if:
- You work outside the U.S. The accountable plan concept and the per diem framework are U.S.-specific.
- You are reimbursing 1099 contractors. Contractors deduct their own expenses on Schedule C. You reimburse them at the agreed contract rate; they do not file expense reports through your plan.
- You are reimbursing partners in a partnership. Partnership reimbursement of partner expenses uses a different mechanism (UPE on Schedule E) with its own rules.
- Your business has no employees and no S corp election. Sole proprietors do not reimburse themselves; they just deduct expenses on Schedule C. See our tax deductible business expenses checklist.
- You are setting up benefits, not reimbursement. Health insurance, retirement contributions, and qualified fringe benefits use different IRS rules. This page covers business expense reimbursement only.
Frequently Asked Questions
What is the policy of expense reimbursement?
An expense reimbursement policy is a written set of rules describing which business expenses an employer will repay to an employee, how the employee documents those expenses, and on what timeline. To be tax-free under IRC Section 62(c) and Treasury Reg 1.62-2, the policy must meet the three-part accountable plan test: business connection, substantiation within a reasonable time, and return of any excess.
What is the IRS rule for expense reimbursement?
The IRS requires reimbursement plans to meet three tests to be tax-free: (1) the expense has a business connection, (2) the employee substantiates the expense within a reasonable time (60-day safe harbor), and (3) any excess advance is returned within a reasonable time (120-day safe harbor). All three must be met. Failing one converts the entire reimbursement into taxable wages under Treasury Reg 1.62-2.
What is the $75 receipt rule?
IRC Section 274(d) requires receipts for expenses of $75 or more, except lodging where receipts are always required regardless of amount. For expenses under $75 (other than lodging), a receipt is not legally required, but a contemporaneous record of the date, amount, place, and business purpose is still required. Most employers require receipts for everything because the marginal cost is zero.
What is an example of a reimbursement policy?
A simple accountable plan policy covers eligible expense categories (travel, meals, mileage, supplies), reimbursement rates (IRS standard mileage rate, federal per diem), documentation requirements (receipts plus date/amount/place/purpose), timing (expense reports within 60 days, advances returned within 120), and an approval workflow. A two-page document covers what most small businesses need.
Do I need a written accountable plan or can I just follow the rules?
You can technically operate an accountable plan without a written policy by simply following the three-part test in practice. But a written plan is strong evidence in audit that the structure exists, removes ambiguity for employees about what to submit, and is required by some states' labor laws as part of the broader reimbursement policy. Two hours of drafting saves significant audit risk.
Does the IRS require employers to reimburse business expenses?
Federal law does not require employer reimbursement of business expenses. Several states do, including California, Illinois, Massachusetts, Pennsylvania, New York, and the District of Columbia. The federal accountable plan rules govern how reimbursement is taxed; they do not require that reimbursement happen.
Bottom line
The accountable plan structure is the single highest-ROI policy a small business can adopt. Setup is a half-day; the annual savings on payroll taxes alone usually beats the cost of any tax-prep service.
The minimum viable accountable plan:
- Write a two-page policy describing what is reimbursable, how to document it, and the timing.
- Adopt the IRS standard mileage rate for vehicle use.
- Require expense reports within 60 days with receipts and business purpose.
- Return excess advances within 120 days.
- Pay reimbursements through a separate line on the bank ledger, not through payroll.
That is enough to satisfy Treasury Reg 1.62-2. Layer on per diem for travel, accountable plan reimbursement for S corp home office, and state-law compliance as needed.
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