Home Office Deduction — Complete Practitioner Guide

What Is the Home Office Deduction?

The home office deduction under IRC §280A allows self-employed individuals, sole proprietors, and business owners to deduct a portion of their home expenses attributable to the space used regularly and exclusively for business. The deduction can include mortgage interest, rent, utilities, insurance, repairs, and depreciation — all allocated to the business use percentage of the home.

The home office deduction is one of the most commonly claimed — and most commonly misunderstood — deductions in the tax code. The IRS scrutinizes it closely, but a properly documented home office deduction is fully defensible and can generate $3,000–$8,000 or more in annual deductions for the typical self-employed client.

One critical point for 2026: the Tax Cuts and Jobs Act (TCJA) eliminated the home office deduction for W-2 employees, and the One Big Beautiful Bill Act (OBBBA) made this elimination permanent. Employees who work from home — even full-time remote workers — cannot deduct home office expenses on their federal return. Only self-employed individuals, sole proprietors, partners, and S-Corp shareholders (through an accountable plan) can claim the deduction.

The Two Qualifying Tests: Regular and Exclusive Use

To claim the home office deduction, the taxpayer must satisfy two tests:

Test 1: Regular use. The home office must be used on a regular basis for business. Occasional or incidental use does not qualify. The IRS does not define "regular" with a specific number of hours or days, but the use must be consistent and recurring — not just when the taxpayer happens to work from home occasionally.

Test 2: Exclusive use. The home office space must be used only for business — not for any personal activities. This is the most strictly applied test and the most common reason home office deductions are disallowed on audit. If the space is used as a guest room, a children's playroom, a TV room, or for any personal purpose, the deduction is disallowed for the entire space.

The exclusive use test does not require a separate room — a clearly defined area of a room can qualify. But the area must be used only for business. A desk in the corner of a living room where the taxpayer also watches TV does not qualify. A dedicated workspace in a spare bedroom that is used only for business does qualify, even if the room has a closet used for personal storage (the closet area is excluded from the calculation).

There are two exceptions to the exclusive use test: (1) daycare providers, who can use the space for both daycare and personal purposes (with a time-based allocation); and (2) taxpayers who use a portion of their home for the storage of inventory or product samples in a trade or business of selling products.

Simplified Method vs. Actual Expense Method: Which Is Better?

Taxpayers can choose between two methods to calculate the home office deduction each year:

For most homeowners with a dedicated home office of 200+ square feet, the actual expense method produces a significantly larger deduction. The simplified method is best for renters (who have no depreciation component) or taxpayers with very small home offices who want to minimize complexity and eliminate recapture risk.

The S-Corp Owner Strategy: Accountable Plan Reimbursement

S-Corp shareholders face a unique challenge with the home office deduction. Because S-Corp shareholders are employees of their own corporation, they cannot claim the home office deduction directly on their personal return (the employee exclusion applies). Instead, there are two strategies available:

Strategy 1: Accountable plan reimbursement. The S-Corp reimburses the shareholder for home office expenses under an accountable plan. The reimbursement is deductible by the S-Corp and tax-free to the shareholder. The shareholder must submit an expense report with documentation of the home office expenses. The reimbursement is not included in the shareholder's W-2 income.

Strategy 2: Augusta Rule rental (§280A(g)). The S-Corp rents the home office from the shareholder for up to 14 days per year at fair market value. The rent is deductible by the S-Corp and tax-free to the shareholder (not reported as income). This strategy is often more advantageous than the accountable plan because the rental income is completely tax-free — no self-employment tax, no income tax, no FICA.

For most S-Corp owners, the combination of the accountable plan (for ongoing monthly expenses) and the Augusta Rule (for periodic business use of the home) produces the maximum tax benefit.

Depreciation Recapture: The Hidden Risk of the Actual Expense Method

When a homeowner uses the actual expense method and claims depreciation on the home office portion, a tax liability is created that will be triggered when the home is sold. The depreciation taken on the home office portion is subject to recapture at the 25% unrecaptured §1250 gain rate — not the preferential long-term capital gains rate.

Importantly, the §121 home sale exclusion ($250,000 single / $500,000 MFJ) does not shelter the depreciation recapture. Even if the total gain on the home is excluded under §121, the depreciation taken on the home office portion is recaptured at 25%.

Example: A homeowner takes $1,000 per year in home office depreciation for 10 years ($10,000 total). When the home is sold, $10,000 is recaptured at 25% = $2,500 in additional tax. The deductions taken over 10 years at a 37% marginal rate generated $3,700 in tax savings — so the net benefit is $1,200 even after recapture. The actual expense method is still advantageous, but practitioners must explain the recapture to clients who may sell their home.

The simplified method avoids this issue entirely — no depreciation is taken, so there is no recapture on sale. For clients who plan to sell their home in the near term, the simplified method may be preferable.