Accountable Plans for Reimbursing Business Expenses

Owners and employees often pay for business expenses personally: a phone bill, mileage, a home office, travel, or supplies. If the company reimburses those costs the wrong way, the reimbursement can be treated as taxable wages. An accountable plan is a set of rules under the tax regulations that lets a company reimburse business expenses without treating the payments as wages, as long as specific requirements are met.

The Three Requirements

Treasury regulations describe three tests that a reimbursement arrangement generally must satisfy to be an accountable plan:

1. Business connection. The expenses must have a business connection, meaning they are incurred while performing services as an employee.
2. Substantiation. The employee must adequately account to the employer for the expenses within a reasonable period of time, typically by providing receipts or logs.
3. Return of excess. The employee must return any advance or reimbursement that exceeds substantiated expenses within a reasonable period.

If an arrangement fails these tests, payments are treated as made under a nonaccountable plan and are generally included in wages, subject to withholding and payroll taxes.

Why It Matters for Owner-Employees

In an S corporation or C corporation, owners who work in the business are employees. When an owner pays for business expenses with personal funds, an accountable plan provides a clean way for the corporation to reimburse them. The corporation deducts the reimbursed expense, and the owner does not report the reimbursement as income. This is generally more consistent than deducting expenses on the personal return, since unreimbursed employee business expenses are currently not deductible for most employees under federal law.

Sole proprietors and partners do not generally use accountable plans in the same way, because their expenses are already reported on their own schedules. A change of entity type may therefore alter how these costs are handled. See When to Switch from LLC to S Corporation Taxation.

Common Reimbursable Categories

Depending on facts, accountable plans are often used for:

• Business mileage using a per-mile rate published by the IRS or actual vehicle costs, with a mileage log. See Vehicle Deductions for Business Owners.
• Cell phone and internet used for business, based on a reasonable business-use percentage.
• Home office expenses for an employee whose home office meets the rules, allocated by a reasonable method. See Home Office Deduction for Business Owners.
• Travel, meals, and lodging on business trips, with receipts and business purpose.
• Supplies, software, and professional subscriptions purchased personally.

Documenting the Plan

A written plan is not strictly required in every case, but it is strongly recommended. A simple plan document states which expenses are covered, how they must be substantiated, the timing of submissions, and how excess advances are returned. Some owners add a short board or shareholder resolution adopting the plan.

Building a Routine

The plan works only if it is followed. A practical routine involves monthly expense reports with receipts, approved and reimbursed by the company, with a separate account line for reimbursements. Mileage logs should be contemporaneous. Reimbursements for the home office should follow a calculation kept on file, revisited each year.

Common Mistakes

• Reimbursing round-dollar amounts with no substantiation.
• Paying a flat monthly stipend without matching to actual expenses.
• Reimbursing personal expenses.
• Lacking mileage logs or business purpose descriptions.
• Never documenting the plan.
• Letting reimbursements lag for many months.

Questions to Ask

1. Which expenses does my business incur that are paid personally?
2. What substantiation will we require, and how often?
3. Is a written plan in place?
4. How should home office use be calculated and updated?

For related payroll considerations, see Payroll Setup for Owner-Operators.

A Hypothetical Reimbursement Cycle

Consider an owner-employee who uses a personal phone and drives to client meetings. Each month, the owner submits an expense report listing the business miles from a mileage log, the business share of the phone bill based on an agreed percentage, and a few receipts for supplies. The company reviews the report, reimburses the total by check or transfer, and records the amounts in expense accounts rather than in payroll. At year end, the totals tie to the log and receipts. This is a simplified example, but it shows the rhythm of a compliant plan: report, review, reimburse, retain records.

When to Revisit the Plan

Review the plan document when the business adds employees, changes locations, or begins reimbursing new categories such as travel. Employee-facing rules should apply consistently, and owner-only arrangements can be a warning sign if they look like disguised compensation.

Educational purposes only. This page is general education and is not tax, legal, or accounting advice. Tax laws change and outcomes depend on individual facts, so consult a qualified professional before acting. No result is guaranteed.