What an accountable plan must require for owner reimbursements

What an accountable plan must require

An accountable plan must require three things: that reimbursements be paid for business expenses connected to the employer's business, that the recipient adequately account for those expenses, and that any excess reimbursement be returned within a reasonable time. If all three rules are met, reimbursements are not included in the recipient's income on Form W-2. If any rule fails, the payments are generally treated as made under a nonaccountable plan (IRS Publication 463).

For an S-corp owner who takes reimbursements through the company, the narrow question is whether your plan, as written and as operated, actually satisfies all three rules. A plan document alone is not enough; the way you submit and process reimbursements has to match the rules.

Rule 1: Business connection

Every reimbursement must be for an expense related to the company's business. Publication 463 notes that reimbursements for expenses that would not qualify as deductible employee business expenses fail the business-connection rule, and those amounts are treated as paid under a nonaccountable plan. The IRS example: a plan that reimburses travel expenses for business travel, but also reimburses meals for an employee who works late at the office without being away from home, fails for the nonqualifying meals portion.

Practical step: before you submit a reimbursement, confirm the expense is one the business actually incurs for its operations. If an expense would not qualify as a business expense on its own, do not route it through the accountable plan.

Rule 2: Adequate accounting

The plan must require you to adequately account for expenses. Publication 463's timing guidance includes adequately accounting for expenses within 60 days after they were paid or incurred.

Adequate accounting means documentation that shows the elements of the expense. IRS recordkeeping guidance says supporting documents should identify the payee, the amount paid, proof of payment, the date incurred, and a description showing the amount was for a business expense. Acceptable documents include receipts, canceled checks or other proof of payment, account statements, credit card receipts and statements, and invoices (IRS recordkeeping guidance).

A practical monthly workflow:

1. Pay the expense from the business account or submit it promptly.
2. Attach the receipt plus proof of payment to a simple expense report listing date, payee, amount, and business purpose.
3. Submit within your plan's accounting window rather than batching months of receipts.
4. Have someone other than the requester approve the reimbursement when possible.

Rule 3: Returning excess amounts

If the company advances you more than you substantiate, the excess must be returned within a reasonable time. Publication 463 gives timing examples: returning excess reimbursement within 120 days after the expense was paid or incurred, or complying within 120 days of a periodic statement (at least quarterly) asking you to account for or return outstanding advances. Amounts paid in excess of substantiated expenses that are not returned are treated as paid under a nonaccountable plan.

Practical step: avoid open-ended advances. If you do use one, reconcile it on a set schedule and record the return of excess in the books the same month it happens.

What happens when a rule fails

Reimbursements that fail any of the three rules are generally treated as paid under a nonaccountable plan, which means the amounts can end up treated as wages. Publication 463 also notes that if reimbursements were included in box 1 of Form W-2 but the accountable plan rules were actually met, the employee can ask the employer for a corrected Form W-2. The employer decides whether to reimburse under an accountable or nonaccountable plan, and voluntary accounting or voluntary return of excess by the recipient cannot convert nonaccountable payments into accountable-plan payments.

Keep the plan and the books aligned

Your bookkeeping should reflect the plan in operation: a summary of business transactions in your books, supported by the underlying documents. IRS recordkeeping guidance notes that a combination of supporting documents may be needed to substantiate all elements of an expense, and that electronic records must meet the same basic principles as hard-copy records. For reimbursements tied to travel or vehicle use, expect to substantiate the specific elements of those expense categories.

If you are reviewing owner pay overall, it helps to look at reimbursements alongside your broader compensation decisions, such as what you finish on payroll before year-end in What an S-Corp Owner Should Finish on Payroll Before December 31 and whether the business can support your total take in How to Tell If the Business Can Still Afford the Owner.

If you want a second set of eyes on your reimbursement process, contact KDM Accounting Services Inc. and we will walk through it with you.

Further reading

For related context, read Vehicle & Mileage Deductions for Contractors (2026).

For related context, read Why Owners Should Separate Personal and Business Finances Early.

Sources

• IRS: S corporation compensation and insurance