S-Corp Accountable Plans: Reimbursing Home Office, Phone, and Mileage Expenses

An accountable plan lets your S corporation reimburse you for the business use of your home, your phone, and your car, tax-free to you and deductible to the company. To qualify, each reimbursement has to meet three rules: a business connection, substantiation with records, and the return of any excess. Get those right and the money moves cleanly. Skip them and the same reimbursements can be recharacterized as taxable wages, which defeats the purpose. The plan is simple to run once you set it up, and it is one of the more reliable ways an owner-employee recovers everyday business costs.

Why S-Corp Owners Need This

Here is the trap. After the 2017 tax law, the deduction for unreimbursed employee business expenses was suspended for most filers. As an S-corp owner, you are an employee of your own company. So if you pay for a business cost personally and the company never reimburses you, you generally cannot deduct it on your own return either. The expense just sits there, unrecovered.

The accountable plan is the fix. Instead of you eating the cost, the company reimburses you under a formal plan. The company deducts the expense, and the reimbursement is not income to you. That is the whole reason this matters for owner-employees specifically. A sole proprietor deducts these costs directly on a Schedule C. As an S-corp owner, you route them through the plan instead.

The Three Rules and the Records: Your Checklist

An accountable plan is not paperwork-heavy, but it is rule-bound. Every reimbursement has to clear all three tests, backed by records:

Business connection. The expense has a clear business purpose and was incurred while doing work for the company. Personal costs do not qualify, and mixed-use costs are reimbursed only for the business portion.
Substantiation. You document each expense with adequate records: amount, date, place, and business purpose. Receipts, a mileage log, and a home-office calculation are the backbone here.
Return of excess. If the company advanced you more than you actually spent, you return the excess within a reasonable time. No return, no clean treatment.
A written plan. Have a short written accountable-plan policy adopted by the company so it is clear the reimbursements run under it.
Records kept on file. Hold the receipts, logs, and calculations with your business records in case anyone asks.

If a reimbursement fails any of the three rules, it does not just lose the deduction. It can flip into wages, which means payroll tax and W-2 reporting. The records are what keep it on the right side.

Home Office Reimbursement

If you use part of your home regularly and exclusively for the business, the company can reimburse the business-use share of your home costs. Measure the business-use percentage (the square footage of the office divided by total home square footage is the common method), then apply that percentage to qualifying home costs like rent, utilities, and insurance.

Submit the calculation to the company with the underlying bills. The company reimburses the business-use portion and deducts it. Keep the square-footage math and the source bills together so the number is reproducible. The cleaner the calculation, the easier it is to defend.

Phone Reimbursement

Your cell phone is almost always mixed-use. The accountable plan reimburses the business-use percentage of the bill, not the whole thing. Estimate a reasonable business-use percentage based on how you actually use the line, apply it to the monthly bill, and submit that for reimbursement.

Be honest with the percentage. A consultant who lives on the phone for work has a different split than someone who mostly uses it personally. Document how you arrived at the percentage so it is not a number pulled from nowhere.

Mileage Reimbursement

For business driving, the simplest approach is to reimburse at the IRS standard mileage rate, backed by a mileage log. The log is non-negotiable: record the date, business purpose, and miles for each trip. Commuting between home and a regular workplace does not count as business mileage, so keep those out.

Multiply business miles by the current standard rate, submit the total with the log, and the company reimburses and deducts it. A contemporaneous log (one you keep as you go, not reconstructed at year-end) is far stronger than a guess.

A Monthly Reimbursement Workflow: Worked Example

Devin runs a one-person S-corp consultancy. Here is his monthly routine:

Collect. Through the month he saves receipts, logs business miles in a phone app, and notes his phone’s business-use percentage.
Calculate. At month-end he totals: home office at his business-use percentage of rent and utilities, phone at his business-use percentage of the bill, and mileage at business miles times the standard rate.
Submit. He fills out a one-page expense report listing each category, the amount, and the business purpose, and attaches the receipts and the mileage log.
Reimburse. The company writes him one reimbursement check (or transfer) for the total. Because it is under the accountable plan, it is not wages.
File. He stores the report, receipts, and log with the company records.

One report a month, a single payment, and clean records. The company gets the deductions, and none of it lands on Devin’s W-2.

To make sure your records hold up across all your deductions, not just reimbursements, run the Documentation Checkup and see where your substantiation is thin before anyone asks.

Open the S-Corp Tax Calculator to weigh the payroll-tax tradeoffs for your own numbers.

The Bottom Line

An accountable plan is how an S-corp owner-employee recovers home office, phone, and vehicle costs without turning them into taxable wages. Adopt a short written plan, run every reimbursement through the three rules, and keep the receipts, logs, and calculations on file. The discipline is modest. The payoff is a clean deduction for the company and tax-free money in your pocket.

Want to see how reimbursements and payroll affect your total tax? Open the S-Corp Tax Calculator and model it with your own numbers.

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Frequently Asked Questions

Why can’t I just deduct these expenses on my own return as an S-corp owner?

Because you are an employee of your S corporation, and the deduction for unreimbursed employee business expenses is suspended for most filers after the 2017 law. Routing the costs through an accountable plan lets the company deduct them and reimburses you tax-free, which is the path that still works for owner-employees.

What happens if I skip the records or the return of excess?

The reimbursement can lose accountable-plan treatment and be recharacterized as wages. That means it gets added to your W-2 and picks up payroll tax, which is the opposite of what you wanted. The three rules and the supporting records are what keep the money tax-free.

Do I reimburse the whole phone bill or just part of it?

Just the business-use portion. A cell phone is typically mixed-use, so you apply a reasonable business-use percentage to the bill and reimburse only that share. Document how you arrived at the percentage so the figure is defensible.

Last reviewed: June 21, 2026.