What does "exclusive use" actually mean?

The space must be used only for business — no personal activities in that space. The IRS does not allow partial credit for a room that's partly business and partly personal. A spare bedroom with a desk that also doubles as a guest room doesn't qualify. A dedicated home office used only for client work, even if it's a converted closet, does qualify.

Does "regular use" mean every day?

No, but it means consistently and on an ongoing basis — not just occasionally. If you work from your home office 3 days a week, that's regular use. If you occasionally bring work home and use a space once a month, that's probably not regular use under a reasonable interpretation.

Can I deduct my home office if I also have a regular office?

Yes, if the home office is your principal place of business or if you use it regularly and exclusively to meet clients or customers. The "principal place of business" test is easier to meet if the home office is your only office. If you also rent commercial space, you need the home office to be where you perform your substantial administrative or management activities.

Which method — simplified or actual — is better?

The simplified method ($5/sq ft, max 300 sq ft = $1,500 cap) is easy, has no depreciation recapture risk, and requires no tracking of home expenses. The actual method calculates a percentage of your real home expenses — mortgage interest, insurance, utilities, repairs, and depreciation — and produces a much larger deduction for most owners. The catch: the depreciation you claim reduces your home's basis, triggering depreciation recapture at sale. For a long-term homeowner expecting significant appreciation, the simplified method may be smarter.

I'm an S-corp owner. Can I still deduct a home office?

Not on your personal return the same way a sole proprietor can — because you're an employee of the S-corp, not self-employed. The correct approach is an accountable plan: the S-corp adopts a written accountable plan policy, you submit a reimbursement request for the home office expense (calculated using the actual or simplified method), and the S-corp pays you the reimbursement. The reimbursement is deductible for the S-corp and not taxable to you.

What happens to the home office deduction when I sell my home?

If you used the actual expense method, you claimed depreciation on the home office portion. When you sell, the depreciated portion is subject to depreciation recapture at up to 25%, even if the rest of the gain qualifies for the Section 121 primary residence exclusion. This is why some homeowners prefer the simplified method — it avoids the depreciation recapture issue entirely.

Business deductions

The Home Office Deduction: The Exclusive Use Rule and When It Actually Works

The home office deduction has one requirement that kills most claims: exclusive and regular use. If the space also functions as a guest room or general work area, it doesn't qualify. Here's what does.

Written by Matt Reese, CPA · 6 min read · Published April 2026·Share on LinkedIn

Key Takeaways

The home office deduction requires that the space be used exclusively and regularly for business — not occasionally, and not mixed with personal use.
"Exclusively" means only for business. A desk in the bedroom where you also watch TV doesn't qualify. A dedicated room used only for client work does.
There are two calculation methods: the simplified method ($5/sq ft, max $1,500/year) and the actual expense method (percentage of home expenses including depreciation). The actual method produces a larger deduction but triggers depreciation recapture when you sell.
S-corp owners cannot take the home office deduction on their personal return the same way sole proprietors can. The correct approach is an accountable plan — the S-corp reimburses you for the home office expense, which is deductible for the business.
Renters can use the home office deduction too — the percentage of rent attributable to the office space is deductible.

The exclusive use rule is stricter than most people assume

The IRS’s position is absolute: if any personal activity occurs in the space, it doesn’t qualify. The couch in your home office where you sometimes read? Problem. The desk in your bedroom where you also charge your personal phone? Problem. The dedicated spare room where nothing but client work happens? That works.

The two requirements that determine eligibility

The home office deduction has two threshold requirements that must both be met:

Exclusive use — the space is used only for business. Not primarily for business, not mostly for business. Only.
Regular use— you use the space consistently, on an ongoing basis for your business. Occasional use doesn’t qualify.

Beyond those two, the space must be either your principal place of business, or a place where you regularly meet clients or customers.

Simplified method vs. actual expense method

Home office deduction: simplified vs. actual

Office size200 sq ft

Home size1,800 sq ft (11% ratio)

Annual home expenses (mortgage interest, insurance, utilities)$28,000

Simplified method deduction$1,000 (200 sq ft × $5)

Actual method deduction (before depreciation)$3,080 (11% × $28,000)

Depreciation component (if home value $700k)~$1,400/year additional

Actual method total~$4,480/year

The actual method produces roughly 4× the deduction in this example — but comes with depreciation recapture risk at sale. Homeowners expecting to sell in the next few years should model the recapture cost before choosing.

The S-corp owner problem — and the solution

Sole proprietors claim the home office deduction on Form 8829, which flows to Schedule C. It directly reduces self-employment income.

S-corp owners can’t use this path. As an employee of your own S-corp, you’re not self-employed for this purpose. The correct approach is an accountable plan:

The S-corp adopts a written accountable plan policy (a short document, not complicated)
You calculate the home office expense using either the simplified or actual method
You submit a reimbursement request to the S-corp with documentation
The S-corp pays you the reimbursement — it’s a deductible business expense for the S-corp
You don’t include it in your taxable income (it’s a reimbursement, not pay)

Without an accountable plan, the S-corp owner is leaving a legitimate deduction on the table entirely. This is one of the most commonly missed strategies for S-corp owners working from home.

You might also read

Business deductions

Business Travel Tax Deductions: The Rules That Actually Apply

Adding personal days to a business trip is often less costly than you think — airfare is all-or-nothing based on primary purpose. Here's how the IRS rules work.

Tax strategy

The Augusta Rule: What It Is, What It Actually Requires, and How to Do It Right

Section 280A(g) lets you rent your home to your S-corp for up to 14 days per year — tax-free rental income, business deduction for the entity. Here's what the rule actually requires.

Tax deductions

Business Meals Deduction: What's 50%, What's 100%, and What's Gone

Entertainment expenses are no longer deductible after TCJA 2017. Business meals are still 50% deductible — when there's a genuine business purpose and documentation. What qualifies, what doesn't, and what documentation the IRS requires.

Frequently asked

Questions owners actually ask

What does "exclusive use" actually mean?: The space must be used only for business — no personal activities in that space. The IRS does not allow partial credit for a room that's partly business and partly personal. A spare bedroom with a desk that also doubles as a guest room doesn't qualify. A dedicated home office used only for client work, even if it's a converted closet, does qualify.
Does "regular use" mean every day?: No, but it means consistently and on an ongoing basis — not just occasionally. If you work from your home office 3 days a week, that's regular use. If you occasionally bring work home and use a space once a month, that's probably not regular use under a reasonable interpretation.
Can I deduct my home office if I also have a regular office?: Yes, if the home office is your principal place of business or if you use it regularly and exclusively to meet clients or customers. The "principal place of business" test is easier to meet if the home office is your only office. If you also rent commercial space, you need the home office to be where you perform your substantial administrative or management activities.
Which method — simplified or actual — is better?: The simplified method ($5/sq ft, max 300 sq ft = $1,500 cap) is easy, has no depreciation recapture risk, and requires no tracking of home expenses. The actual method calculates a percentage of your real home expenses — mortgage interest, insurance, utilities, repairs, and depreciation — and produces a much larger deduction for most owners. The catch: the depreciation you claim reduces your home's basis, triggering depreciation recapture at sale. For a long-term homeowner expecting significant appreciation, the simplified method may be smarter.
I'm an S-corp owner. Can I still deduct a home office?: Not on your personal return the same way a sole proprietor can — because you're an employee of the S-corp, not self-employed. The correct approach is an accountable plan: the S-corp adopts a written accountable plan policy, you submit a reimbursement request for the home office expense (calculated using the actual or simplified method), and the S-corp pays you the reimbursement. The reimbursement is deductible for the S-corp and not taxable to you.
What happens to the home office deduction when I sell my home?: If you used the actual expense method, you claimed depreciation on the home office portion. When you sell, the depreciated portion is subject to depreciation recapture at up to 25%, even if the rest of the gain qualifies for the Section 121 primary residence exclusion. This is why some homeowners prefer the simplified method — it avoids the depreciation recapture issue entirely.

Take the next step

Turn tax questions into a plan. Talk with Matt or see how we work with operating business owners.

Talk with Matt See how we work with owners

Educational content only.This article is for informational purposes and does not constitute tax, legal, or investment advice. Every owner’s facts are different; consult a qualified CPA and advisor before acting. Tax and accounting services are provided through Matt Reese, CPA; investment advisory services are provided through Measured Risk Portfolios, a registered investment adviser. Matt Reese, CPA and Measured Risk Portfolios are separate entities; clients are not required to engage both.