If you own an S corporation and work from home, the company, not you, should pay for the home office. The way to do that is a written accountable plan: the S corp reimburses you for the business-use share of your home costs, deducts the reimbursement, and you receive it without it counting as wages. Without that plan, the home office is usually a lost deduction.
This guide explains why, how to calculate the reimbursement, what records to keep, how it is reported, and what goes wrong when the paperwork is missing.
TL;DR
- As an S corp owner who works in the business, you are an employee of your own company, so you cannot claim home office costs as a personal deduction.
- An accountable plan lets the S corp reimburse the business-use share of rent or mortgage interest, utilities, insurance, taxes and repairs, tax-free to you.
- The space must be used regularly and exclusively for business. A guest room that doubles as an office does not qualify.
- The plan needs a business connection, timely substantiation and return of any excess. Miss one and the payments become taxable wages.
- Set the plan up in writing and reimburse on a regular schedule, ideally monthly or quarterly, with a log and a floor plan on file.
Table of Contents
- Why you cannot deduct a home office on your own return
- When your home office qualifies
- How an accountable plan works
- What the S corp can reimburse
- Calculating the business-use percentage
- Records that support the reimbursement
- How the reimbursement is reported
- What happens without a compliant plan
- Perspective
- Make the plan part of a bigger strategy
- Get the plan set up properly
- A simple setup checklist
- FAQ
- Sources
Why you cannot deduct a home office on your own return
A shareholder who performs services for an S corporation is an employee of it. Before 2018, an employee could claim unreimbursed job expenses as a miscellaneous itemized deduction, subject to a floor. That route is closed. Section 67(h) of the Internal Revenue Code disallows miscellaneous itemized deductions for taxable years beginning after December 31, 2017, and the 2025 law (Pub. L. 119-21) removed the old expiration date that would have ended the suspension after 2025.
So the personal route is gone for good, not just for a few years. If you pay for your home office out of pocket and never submit the costs to your company, those costs produce no tax benefit.
The fix is to move the expense to the right place. The S corporation is the business. When it reimburses you for a legitimate business cost under a qualifying plan, the corporation takes the deduction and you are not taxed on the money you receive.
What this looks like in practice
Imagine an S corp owner whose home costs $30,000 a year in mortgage interest, property tax, insurance, utilities and repairs. If 15% of the home qualifies as an office, the business-use share is $4,500. Under an accountable plan, the company reimburses $4,500, deducts $4,500, and you report no extra income. Without a plan, the deduction is $0 and the $4,500 stays a personal cost.
The example is illustrative. Your percentage and costs will differ, and the figure is only as good as your documentation.
When your home office qualifies
The reimbursement is only legitimate if the space would qualify as a home office in the first place. IRS Publication 587 says a qualifying space generally must be used exclusively and regularly as one of the following:
- Your principal place of business.
- A place where you meet clients or customers.
- A separate structure, such as a detached studio or garage, used in connection with the business.
Certain storage and daycare uses carry their own exceptions. For everyone else, exclusive use is the test that trips people up. A space that is also used for personal purposes does not meet it. A desk in the corner of the family room, a dining table you clear each evening or a spare bedroom with a guest bed all create a problem.
Principal place of business
For many owners, the home office is where administrative and management work happens: bookkeeping, scheduling, billing, client communication and planning. If you do that work at home and have no other fixed location for it, the home is likely your principal place of business, even if you spend most of the day at job sites. A plumbing, HVAC or commercial cleaning owner who runs quotes, payroll and scheduling from a dedicated room at home often fits this pattern.
Clinicians and practitioners
If you see patients or clients virtually, your situation has its own wrinkles, such as a dedicated telehealth room and whether the space is also used for the day job. Our guide to home office deductions for telehealth practitioners walks through them. Nurse practitioners who own an S corp can use the same accountable plan structure described here.
How an accountable plan works
An accountable plan is a reimbursement arrangement that meets three requirements under Treasury regulation §1.62-2, as summarized in IRS Revenue Ruling 2003-106:
- Business connection. The expense must be one you incurred while performing services as an employee of the company.
- Substantiation. You must account for the expense to the company within a reasonable period.
- Return of excess. Any advance or reimbursement above what you substantiated must be returned within a reasonable period.
When all three are met, the payments are excluded from your gross income and from employment taxes. That is the whole benefit: the company gets a deduction, and neither you nor the company pays payroll tax on the reimbursement.
The IRS safe harbor treats substantiation within 60 days after the expense is paid or incurred as timely. Excess amounts generally must be returned within a reasonable period. In practice, that means a monthly or quarterly routine works well and a once-a-year scramble does not.
For a deeper look at how the IRS evaluates each requirement, read our breakdown of the three IRS tests for accountable plan rules.
The plan should be in writing
The regulation tests whether the arrangement meets the three requirements, not whether a document exists. Still, a short written plan adopted by the corporation is the clearest evidence of what you intended. A good one states:
- That the company reimburses ordinary and necessary business expenses of employees, including shareholder-employees.
- The categories covered, such as home office, mileage, phone and internet, software, and professional dues.
- How and when expenses must be submitted.
- That excess advances must be returned, and by when.
- That no one can recharacterize wages as reimbursements. The plan reimburses real costs, not a reduction in salary.
The last point matters. An accountable plan is not a way to convert salary into tax-free money. Your reasonable compensation still has to be paid as W-2 wages, and the reimbursement sits on top of it.
What the S corp can reimburse
The corporation may reimburse the business-use percentage of the costs of keeping and running the home. Common categories include:
- Mortgage interest or rent
- Real estate taxes
- Homeowners or renters insurance
- Utilities such as electricity, gas, water and trash
- Repairs and maintenance that benefit the whole home
- Internet and phone, based on business use
Costs that benefit only the office, such as painting that room or repairing its window, can be reimbursed at 100%. Costs that benefit only the rest of the home, such as a repair in the kitchen, are not part of the reimbursement.
If you own the home, the mortgage principal is not an expense. Only interest, taxes, insurance and operating costs are. Depreciation is a separate topic that can have consequences when you sell the home, so talk to your tax advisor before including it in the plan.
Calculating the business-use percentage
The most common method divides the square footage of the office by the total square footage of the home. Publication 587 describes the area-based method, and it is also acceptable to use the number of rooms when rooms are about the same size.
Worked example
| Item | Amount |
|---|---|
| Office size | 150 sq ft |
| Home size | 2,000 sq ft |
| Business-use percentage | 7.5% |
| Annual mortgage interest | $12,000 |
| Property tax | $4,800 |
| Insurance | $1,800 |
| Utilities | $4,200 |
| Repairs and maintenance | $1,200 |
| Total shared home costs | $24,000 |
| Annual reimbursement at 7.5% | $1,800 |
| Monthly reimbursement | $150 |
The figures are hypothetical and show the mechanics only. Measure the office, measure the home, keep the numbers on file, and recompute whenever you move, remodel or change how the space is used.
If you want a refresher on how a shared cost pool is divided between uses, this walkthrough of overhead rate calculation formulas shows the same allocation logic applied to a shop. Your home office share works the same way: a pool of costs, a fair allocation base and a rate you apply consistently.
Keep the allocation consistent
Choose one method and use it every period. If the office is 7.5% of the home in January, it should not be 12% in July without a reason, such as a change in the space. Consistency is a large part of what makes the number defensible.
Records that support the reimbursement
Substantiation is where most plans succeed or fail. A reimbursement without records is just a payment to a shareholder. Keep, at a minimum:
- The written plan, signed or adopted by the corporation, with the date.
- A floor plan or measurements of the office and the whole home, with a few dated photos showing the space is set up for business.
- Bills and statements for each cost in the pool: mortgage interest statement, property tax bill, insurance declaration page, utility bills.
- An expense report for each period showing the cost, the percentage and the amount claimed.
- Proof of payment from the corporation to you, matching the report.
The IRS safe harbor treats substantiation within 60 days as timely, so submit your report within that window after each cost is paid or incurred. A simple monthly spreadsheet is enough. Many owners batch it with their monthly bookkeeping close.
Owners who also drive for the business should run the same discipline on mileage. Our mileage versus actual expenses guide covers how to document vehicle costs under a plan.
How the reimbursement is reported
Because qualifying accountable plan payments are excluded from your gross income and from employment taxes, they are not wages. The practical results are:
- On the S corporation return, the company deducts the reimbursements as ordinary business expenses on Form 1120-S, not as part of officer compensation.
- On your W-2, the reimbursements do not appear in the wage boxes, and no income tax withholding or payroll tax applies to them.
- On your personal return, there is nothing to report for the reimbursement, and no home office deduction to claim.
Have your preparer or bookkeeper code the payments to a dedicated expense account, so the deduction is easy to identify and support. Your preparer will confirm how it flows on the 1120-S for your facts.
If your company also provides other owner benefits, such as health insurance, those follow different reporting rules. See what S corp owners must report on the W-2 for fringe benefits and how more-than-2% shareholders deduct health insurance.
What happens without a compliant plan
If the arrangement lacks a business connection, timely substantiation or the return of excess, Treasury regulation §1.62-2 treats the payments as made under a nonaccountable plan. Under the IRS ruling, those payments are taxable wages subject to applicable payroll reporting and withholding rather than tax-free reimbursements.
Typical failure points are easy to avoid:
- Paying a flat monthly amount with no records. A fixed $500 a month that is not tied to actual costs and an expense report looks like extra pay.
- Reimbursing a space that fails exclusive use. If the room is not used only for business, the expense lacks a business connection.
- Letting the excess sit. If you receive an advance larger than your actual costs, return the difference promptly.
- Reducing salary to fund reimbursements. That turns wages into reimbursements and invites a recharacterization.
The cost of getting it wrong is payroll tax and potential penalties on the payments, plus the loss of the deduction you were trying to claim. The cost of getting it right is a half-page plan and a monthly spreadsheet.
Perspective
Most S corp owners we meet have been paying for a home office personally for years and assumed it was a deduction. It is not, and that is one of the most common gaps we find when we review a new client's return.
The fix is rarely complicated, but it only works when it is run as a system. We build the written plan, set the allocation, and put a monthly or quarterly reimbursement routine in place so the records exist before anyone asks for them. We design each plan around the client's facts rather than a template, because the percentage, the cost categories and the way the owner actually uses the space are different in every household.
The accountable plan is also rarely the only piece. It sits alongside reasonable compensation, owner benefits, entity structure and quarterly planning. We look at the whole picture, so the home office reimbursement supports the larger strategy instead of living as a one-off trick. Solo and partnership practices build income. S corps help you keep more of it.
Melissa
Make the plan part of a bigger strategy
A home office reimbursement is usually worth a few thousand dollars a year, which is real money, but it is one lever among several. How you set salary affects both payroll tax and the qualified business income deduction, which we cover in our guide to QBI for S corp owners. Loans between you and the company need their own documentation, explained in our S corp shareholder loan guide. Your basis determines how much loss and how many distributions you can use, as described in our S corp basis guide.
For the full list of moving parts, see our S corp tax planning strategy guide, and for other commonly missed items, five deductions high earners always miss.
Get the plan set up properly
If you want the accountable plan, the allocation and the documentation built for you, our S-Corp Tax Strategy Accelerator is a $997 one-time engagement for S corp owners who want the structure in place. If you want ongoing planning, we offer Monthly Tax Advisory at $11,997 per year and Quarterly Tax Strategy Sessions at $9,497 per year, both designed to keep the plan, your compensation and your entity structure working together year-round.
If you only need your S corp return prepared, the Form 1120-S fee is $1,800, and you can see every published rate on our fee schedule. You can also explore everything we do at The Tax Refinery.
A simple setup checklist
- Confirm the space meets regular and exclusive use, and that it is where you do your administrative or client work.
- Measure the office and the home, and record the business-use percentage.
- Gather the annual cost of each shared home expense.
- Have the corporation adopt a written accountable plan.
- Choose a reimbursement schedule, monthly or quarterly, and keep to it.
- Submit an expense report within 60 days of each cost, with supporting bills.
- Pay the reimbursement from the company account to you, and code it to a dedicated expense account.
- Review the percentage and costs once a year, and whenever the home or its use changes.
FAQ
Can I deduct my home office on my personal return if I own an S corp?
Generally no. As a shareholder who works for the company, you are an employee, and employee business expenses are miscellaneous itemized deductions, which Section 67(h) disallows for years after 2017. The way to get a benefit is to have the corporation reimburse you under an accountable plan.
Do I need a written accountable plan?
The regulation tests whether the arrangement meets three requirements: business connection, substantiation and return of excess. A written plan is the cleanest way to show you meet them. We recommend one for every S corp owner who reimburses home office costs.
Is the reimbursement taxable to me?
Not when the plan qualifies. Payments under an accountable plan are excluded from your gross income and from employment taxes. If the arrangement fails a requirement, the payments become taxable wages with payroll reporting and withholding.
Can I reimburse myself a flat monthly amount?
Only if it is tied to actual, substantiated costs. A flat amount that does not follow your real expenses and an expense report looks like extra compensation. Calculate the monthly figure from your documented costs and true it up against your records.
What if my office is also used for personal activities?
Then the space generally does not meet the exclusive-use rule in Publication 587, apart from the specific exceptions the IRS lists. Dedicating a room, or a clearly separate area used only for business, solves it.
Sources
- 26 U.S. Code § 67, 2-percent floor on miscellaneous itemized deductions
- IRS Revenue Ruling 2003-106, accountable plans under Section 62
- IRS Publication 587, Business Use of Your Home