Home Office Deduction and the Accountable Plan

The home office deduction is one of the most searched items in US small business tax and one of the most commonly misapplied. The rule that matters is not the square footage calculation — it is that an S corporation owner generally cannot take the deduction personally at all.

Employee business expenses, including an employee's home office, are not deductible on a personal return under current law, and an S corp owner is an employee of their own company. The correct mechanism is different, and it produces a better result.

In this article, we cover who can still claim the deduction directly, how an accountable plan replaces it for corporation owners, and the substantiation both routes require.

1. Who Can Still Deduct Directly?

Self-employed owners — sole proprietors and single-member LLCs without an S election — claim the home office deduction on their own return, subject to two tests.

The space must be used regularly and exclusively for business, and it must be the principal place of business. Exclusive means what it says: a dining table that hosts dinner does not qualify, and the IRS sets out both tests in its home office deduction guidance.

Two calculation methods exist. The simplified method applies a set rate per square foot up to a capped area, requiring almost no record-keeping. The regular method allocates actual costs — rent or mortgage interest, utilities, insurance, repairs — by the business percentage of the home, and generally produces a larger deduction in a high-rent city.

A limit applies to both methods. The deduction generally cannot create or increase a business loss, so in a year where the business runs at or near breakeven the benefit is capped and, under the regular method, part of it may carry forward. This is one reason owners with variable profit prefer the regular method's records even when the simplified method looks easier.

Renters in high-cost cities typically do far better under the regular method, because rent is the largest allocable cost and the simplified rate is capped. Our guide to LLC taxes covers how the deduction interacts with entity choice.

Which method leaves you better off

The simplified method is capped: a set rate per square foot up to a maximum area, which puts a ceiling of $1,500 a year on the deduction however large the home or the rent. The regular method has no such ceiling, and in a high-rent city it usually produces a larger figure.

The answer reverses with holding period, and only for homeowners. Over a short hold the regular method's larger annual deduction wins comfortably. Over a long hold, the depreciation it requires reduces basis and is recovered when the home is sold — which can hand back much of what was claimed, and interacts with the principal residence exclusion. A renter faces none of this, and should generally take whichever number is larger.

2. Why S Corp Owners Need a Different Route

Once an entity elects S corporation status, the owner becomes an employee of the company, and the personal home office deduction closes off.

The replacement is an accountable plan: a written policy under which the company reimburses the owner for business expenses incurred personally. The reimbursement is deductible to the company and is not taxable income to the owner — the same economic result, reached through the company rather than the personal return.

The comparison shows why the accountable plan is not a workaround but the intended route. Without a written plan, reimbursements can be treated as additional wages — taxable to the owner and subject to payroll tax, which is the opposite of the intended outcome.

There is a second reason the reimbursement route is preferable even where a personal deduction would be available. A company deduction reduces business income directly, which also reduces the base for city business tax inside New York, whereas a personal itemised deduction does not reach that layer at all.

3. What an Accountable Plan Requires

Three conditions define an accountable plan, and all three have to hold.

Expenses must have a business connection; they must be substantiated to the company within a reasonable period; and any excess advance must be returned. In practice this means a written policy adopted by the company, a monthly expense report from the owner, and an actual payment recorded in the books — not a year-end journal entry.

The home office reimbursement itself is computed the same way the regular method would compute the deduction: business square footage as a share of the home, applied to rent or mortgage interest, utilities, insurance and repairs. Keep the calculation, the lease or statement, and the utility bills with the ownership records described in our article on IRS audits.

The same plan should cover the other costs an owner meets personally — business mileage, a share of the mobile phone, professional subscriptions and travel. Reimbursing them through one policy on a monthly cycle is simpler to administer and far easier to defend than a year-end reconstruction, and it keeps the company's books and the owner's bank records aligned.

4. The Objection: It Is a Red Flag

However, some argue the home office deduction invites scrutiny and is not worth claiming — a persistent piece of folk wisdom in US small business circles.

The claim confuses two things. A correctly substantiated deduction is not a risk; an unsubstantiated one is. The positions that cause difficulty are exclusivity failures — a room used for business and for family life — and estimates produced after the fact rather than measurements and bills kept at the time.

There is one genuine consideration for homeowners rather than renters. Depreciation claimed on the business portion of a home reduces basis and is recovered on a later sale, which interacts with the principal residence exclusion. That is a reason to plan the position with a CPA, not a reason to skip the deduction. Our guide to working from home covers the practical side.

A last point on scale. The deduction or reimbursement on a New York apartment is rarely transformative on its own, but it recurs every year and it costs almost nothing to maintain once the measurement and the policy exist. Recurring, low-effort positions are the ones worth setting up properly at the start.

5. Final Thoughts

Match the mechanism to the entity. Self-employed owners deduct directly. Corporation owners reimburse through a written accountable plan — and adopting that plan is a one-page task that should happen at the same time as the S election, not afterwards.

Either route rests on the same foundation: a genuinely exclusive space, a documented measurement, and contemporaneous bills. Those records take minutes a month and settle the question permanently.

Rates, caps and calculation methods change, so confirm current figures with the IRS and a US CPA before filing. If you are electing S corporation status for a New York business and want the accountable plan drafted alongside it, speak with our team.

Reinvent NY provides business consulting, operational support, and coordination services. Legal advice and immigration filings are handled by independent licensed attorneys. Real estate services are provided through licensed professionals and applicable brokerage relationships. This article is for informational purposes only and does not constitute legal or investment advice.

More for business owners: NYC Unincorporated Business Tax vs S Corp, S Corp vs LLC for a New York Business, Estimated Tax for New York Business Owners.