S corporation reimbursements for home, phone and car

Can I deduct my S corporation home office on my own return?

An S corporation shareholder who works as its employee generally cannot claim an employee home-office deduction on a personal federal return. If the space and costs meet the business rules, the corporation can instead repay the employee under an accountable plan. IRS Publication 587 says employees do not qualify for its home-office deduction; IRS Publication 15 explains when employee business repayments are excluded from wages.

An accountable-plan payment is for an expense incurred while serving the corporation. For home costs, the space should be used regularly and exclusively for its business, as a principal work location, a place to meet clients in the normal course of business, or a qualifying separate structure. For an employee, the home use must also be for the employer's convenience, not simply a personal preference (Internal Revenue Code, section 280A(c)(1)). Document why the corporation needs the space, especially if another suitable office is available.

The corporation cannot convert personal housing costs into business expenses merely by calling a payment a reimbursement. Do not claim the same reimbursed cost again on your personal return. The IRS home-office rules require separating business and personal costs.

What makes a reimbursement an accountable plan, and must it be written?

An accountable plan requires a business connection, timely proof of the expense, and repayment of any excess advance. Federal rules do not require a written plan, but a short written policy makes the terms and records easier to follow (IRS Publication 15; IRS Publication 5137).

A fixed monthly payment without a true-up to actual, eligible expenses can fail. Under an otherwise valid plan, an excess payment becomes wages if it is not supported or returned on time. If the arrangement does not require timely proof or return of excess, or replaces wages, its payments are wages even if the employee later provides receipts (IRS Publication 15; IRS Publication 463).

Which home-office costs can the corporation repay?

The corporation can generally repay the supported business share of eligible home costs when the office meets the employee-use rules. Calculate the share with a reasonable method, such as office floor area divided by total home floor area, and use only costs from the period the space qualified. For an owned home, apply that share to actual whole-home bills and add costs that serve only the office (IRS Publication 587).

The IRS home-office expense table distinguishes direct, indirect and unrelated costs. Before repaying an owner's interest, property taxes or depreciation, confirm the plan's treatment and coordinate with the owner's return so no cost is claimed twice. Business-use depreciation can affect gain when the home is sold. Keep the floor-area calculation, bills, payment proof and dates the office was used. A kitchen table used by the family does not meet the exclusive-use test.

Can the corporation repay my cell phone and internet bills?

Yes, when the corporation needs the service for its business and the repayment is reasonably tied to an actual bill. A personal phone or internet bill is not automatically a wholly business expense.

For an employee-owned cell phone, IRS examination guidance allows a business-driven reimbursement that does not exceed the employee's actual coverage cost and does not replace wages. The IRS even describes a flat-rate basic plan paid in full when the employer needs after-hours client contact. That treatment depends on the business reason and reasonable cost; it is not a blanket rule for every personal phone. Keep the bill and state why the corporation requires the service.

For a mixed-use home internet connection, document a reasonable business allocation or separately billed business service. The cell-phone guidance does not extend its special treatment to internet service; apply the accountable-plan business-connection and substantiation rules instead (IRS Publication 15). Personal use stays personal. A first home landline's basic charge is also treated as personal, even when business calls are made on it (IRS Publication 587).

How do I get repaid for business miles in my own car?

Submit a dated mileage log showing each business trip, destination, purpose and miles. The corporation can use the optional IRS business mileage rate for eligible miles, or repay substantiated actual business costs under the applicable rules. Commuting from home to a regular workplace is personal travel (IRS Publication 463).

Apply the rate for the date driven; paying a June trip after July begins does not turn those miles into July miles. An allowance paid before July 1 does not qualify for the revised rate, even for later travel (IRS Announcement 2026-11). Travel between work locations, or from a qualifying principal home office to another work location in the same business, can count. If you have no regular office and no qualifying home office, travel from home to your first business contact and from the last contact home within your metropolitan area is commuting. Log each leg, total annual miles and personal detours (IRS Publication 463). If you own more than 10% of the corporation's stock by value, retain proof of your trips for the IRS even after reporting them to the corporation; the ordinary allowance substantiation shortcut does not apply to you (IRS Publication 463). Business parking and tolls may be repaid separately; do not add gasoline and ordinary car costs on top of the standard mileage allowance.

Whether the corporation should own or lease the vehicle is a separate choice; see Buying a vehicle through your business.

When must I report costs or return an advance, and what goes on my W-2?

Submit expenses and return unsupported advances within a reasonable period. The IRS says the answer depends on the facts, but its safe timing examples allow an advance within 30 days of the expense, accounting within 60 days after it, and returning excess within 120 days after it. Alternatively, if the corporation sends a statement of outstanding advances at least quarterly, account for the costs or return the excess within 120 days after the statement (IRS Publication 15).

If an advance remains unsupported or excess is not returned by the end of the reasonable period, include the taxable amount in the first payroll period after that period ends (IRS Publication 15). The W-2 instructions reserve code L for mileage or per-diem allowances that exceed the amount treated as substantiated. Ordinary receipt-based reimbursements generally do not need a W-2 entry. A reimbursement is not an owner distribution; keep the expense report with the corporate books. If earlier payments were booked as draws or omitted from payroll despite failing the rules, review the records and W-2 treatment before filing.

If the corporation fails to withhold or remit tax on those wages, a shareholder-officer who controls payroll and willfully fails to pay can personally owe a penalty equal to the unpaid employee income-tax withholding and Social Security and Medicare taxes under section 6672; ownership alone does not establish liability. The IRS generally has three years from the following April 15 or the later filing date to assess it; an unfiled return leaves no assessment limit (IRS Internal Revenue Manual). The IRS gives 60 days to appeal a proposed assessment, or 75 days if the letter is addressed abroad.

Should my corporation pay me rent for my regular home office?

For a regular home office, first check whether the corporation can repay qualifying costs under an accountable plan. Ongoing rent generally becomes income to the owner, while section 280A(c)(6) bars home-office business deductions attributable to renting the space to an employer during periods the owner works there as an employee (IRS Chief Counsel memorandum).

The corporation's rental deduction still needs a genuine business purpose and reasonable terms under section 162. A lease does not turn mortgage principal or personal household costs into the owner's deductible rental expenses. Compare the rent and reimbursement consequences before signing a recurring arrangement.

Can I rent my home to the corporation for fewer than 15 meeting days?

If the home is used as a residence (generally more than 14 personal-use days when rented for fewer than 15 days) and is actually rented for fewer than 15 total days in the year, you generally do not report that rental income on your federal return or deduct related rental expenses. Count all rentals of the home, including meetings and rentals to others. If the total reaches 15 days, report all rental income under the regular rental rules (section 280A; IRS Publication 527).

For a real corporate meeting, keep the date, agenda, attendees, business purpose, payment and evidence that the rent is reasonable for comparable space. The corporation may deduct an ordinary and necessary meeting-space cost under section 162. The short-rental rule does not make monthly home-office rent for ongoing employee work a meeting expense. Whether a particular shareholder rental is a genuine business transaction is fact-dependent; review the terms before payment.

What if I am a partner rather than an S corporation shareholder?

A partner can deduct unreimbursed ordinary and necessary partnership costs on Schedule E only when the partnership agreement requires the partner to bear them. A partner cannot choose to leave reimbursable costs unpaid and then take the deduction personally (IRS Schedule E instructions).

The partnership's agreement, expense policy and actual reimbursement rights matter. Keep the agreement, bills and business-use records. For a home office, the IRS home-office publication provides a worksheet for partners with qualifying unreimbursed costs; passive-activity rules can change where a deduction is reported.

For an unreimbursed car deduction, the partner chooses the standard mileage rate on a return filed by its due date, including extensions, in the first year the car is available for business. Claiming section 179 or accelerated depreciation on that car prevents use of the rate (IRS Publication 463).

Example

Illustrative amounts are in US dollars. An S corporation requires its owner-employee to use a separate home office for company administration. The office is 150 square feet in a 1,500-square-foot home, so its business share is 10%. Monthly rent is US$2,000 and utilities are US$300. The supported home reimbursement is US$230. The corporation also repays US$50 of documented business phone service.

The owner logs 100 business miles before July and 100 on or after July, and the corporation repays both trips after July begins. At US$0.725 and US$0.76 per mile, the mileage repayment is US$72.50 plus US$76. The total supported repayment is US$428.50. The corporation records the underlying home, phone and car expenses; the owner does not add that repayment to wages. The result changes if the space is used personally, trips are commuting, or the bills and mileage are not substantiated (IRS Publication 15; IRS mileage announcement).

Different for you?

• The company may buy or lease the car: compare that with repaying miles in Buying a vehicle through your business.
• The payment is for owner health insurance: those premiums have different W-2 and deduction rules; see Health insurance for owners.
• The payment is salary or an owner draw: see S corporation owner salary and How S corporations are taxed.
• Reimbursements recur or earlier W-2s may be wrong: gather the policy, reports, bills, floor-area calculation, mileage logs and payroll records, then get bookkeeping help.
• You are a partner: gather the partnership agreement and reimbursement policy before claiming an unreimbursed cost; get bookkeeping help if the arrangement is unclear.
• State treatment matters: federal exclusion does not establish the state result. Review your state's rules with bookkeeping help.