Home Office Deduction

The home office deduction is the deduction for business use of your home, which is also its official name: the governing IRS publication is Publication 587, "Business Use of Your Home," and the form is Form 8829, "Expenses for Business Use of Your Home." The statute is section 280A, which is structured as a prohibition with exceptions. Subsection (a) disallows any deduction "with respect to the use of a dwelling unit" used as a residence, and subsections (c)(1) through (c)(4) then carve out the cases where a deduction is allowed: a portion used exclusively and regularly for business, storage of inventory or product samples, rental use, and a qualifying daycare facility.

Reading it that way explains why the eligibility tests are so specific. The default answer is no, and the deduction exists only to the extent a taxpayer fits a described exception, which is a very different posture from a deduction that is generally allowed subject to limits.

The most important fact about this deduction in 2026 is who cannot claim it, and almost all published guidance states it wrongly. An employee working from home has no route to a home office deduction, and this is not a temporary measure. Two provisions combine. Section 280A(c)(1) says that in the case of an employee the exception applies "only if the exclusive use referred to in the preceding sentence is for the convenience of his employer," which is a narrow test on its own. And an employee's unreimbursed business expense is a miscellaneous itemized deduction, which section 67(h) disallows for "any taxable year beginning after December 31, 2017." That sentence used to end with a January 1, 2026 expiry date, and the 2025 tax law struck it. So an explainer saying employees cannot claim the deduction "through 2025" implies a return that is not coming. Publication 587's own decision flowchart routes an employee straight to no deduction. The practical alternative for a remote employee is an employer reimbursement arrangement, which is a payroll question rather than a tax deduction.

The two eligibility tests, and why exclusivity is where returns fail. The space must be used regularly, meaning on a continuing basis rather than occasionally, and exclusively for the trade or business. Publication 587 is helpful on what exclusivity does and does not require: "The area used for business can be a room or other separately identifiable space. The space does not need to be marked off by a permanent partition." So a corner of a room can qualify. What defeats it is mixed use. A den used to prepare client work and also by the family for recreation fails, and the publication uses exactly that example. Note also that the activity has to be a trade or business: managing your own investments, however diligently, is not one.

The principal place of business test has an administrative branch that catches a lot of people. Section 280A(c)(1)(A) provides that "the term 'principal place of business' includes a place of business which is used by the taxpayer for the administrative or management activities of any trade or business" if there is no other fixed location where the taxpayer conducts substantial administrative or management activities. That is the provision under which a contractor who works on client sites all day, or a therapist who sees patients at a clinic, can still qualify on the strength of doing the scheduling, billing and records at home. There are two further routes that do not depend on principal place of business at all: a space used regularly to meet clients or customers, and a separate structure not attached to the dwelling, which is held to a looser standard.

The simplified method. Publication 587 states it plainly: you figure the deduction "by multiplying $5, the prescribed rate, by the area of your home used for a qualified business use," and "the area you use to figure your deduction is limited to 300 square feet." The maximum is therefore $1,500. The rate comes from Revenue Procedure 2013-13 and is not inflation-indexed; it has not moved since 2013 and moves only if the IRS issues new guidance. Choosing it is an annual election made on a timely filed original return, irrevocable for that year, and switching between methods from year to year is permitted and is not a change of accounting method. Part-year use or a change in square footage is handled by averaging monthly allowable square footage, and a month with fewer than 15 days of qualified use counts as zero.

The actual expense method. Here you allocate real household costs to the business portion, usually by square footage. Costs specific to the space are direct and deducted in full; costs of running the whole home, mortgage interest, property tax, insurance, utilities, general repairs, are indirect and deducted at the business percentage. The method also requires depreciation on the business portion of the house, computed over 39 years, which is where the long-term consequence enters. The figures go on Form 8829.

The choice between methods is really a decision about the eventual sale, and this is the part most comparisons omit. When a home is sold, section 121(d)(6) removes from the home-sale exclusion the gain attributable to depreciation adjustments taken after May 6, 1997, and those adjustments are measured by what was allowed or allowable, not by what was claimed. A taxpayer who was entitled to depreciation under the actual method and never took it therefore still faces the add-back, taxed as unrecaptured section 1250 gain at a maximum rate of 25%. The simplified method avoids this by design: Revenue Procedure 2013-13 provides, and Publication 587 repeats, that "the depreciation deduction allowable for that portion of the home is deemed to be zero for a year you use the simplified method." Deemed to be zero is the operative phrase, because it removes the allowable amount rather than merely the claimed one. So the actual method is worth more each year and leaves something to unwind; the simplified method is worth less and leaves nothing.

The income limitation, and an asymmetry in what happens to the excess. Under either method the deduction cannot exceed the gross income from the business use of the home, reduced by the business deductions unrelated to the home. Under the actual method an amount disallowed by that limit carries forward to a later year, subject to the same limit then. Under the simplified method it does not: Revenue Procedure 2013-13 states that "any amount in excess of this gross income limitation is disallowed and may not be carried over and claimed as a deduction in any other taxable year." And a carryover generated in an actual-expense year cannot be deducted during a year the simplified method is used; it waits for the next actual-expense year. The practical effect is that a business with thin or seasonal profit gets a materially different answer from the two methods.

The sequence, once you have established that you are self-employed and that a space passes the exclusive and regular tests.

1. Measure the space and the home. Square footage of the business area, and of the whole home, gives you both the simplified figure and the allocation percentage for the actual method.

2. Compute both methods for the year and compare, remembering that the comparison is not only about this year's number.

3. Apply the income limitation. Take the gross income from the business use of the home, subtract the business deductions unrelated to the home, and cap the deduction at what is left.

4. Report it. A sole proprietor who uses actual expenses files Form 8829 and carries the result to Schedule C; the simplified figure goes on Schedule C directly through the worksheet in its instructions.

A hypothetical example, with both methods on the same facts. Naledi is a self-employed translator. Her home is 2,000 square feet and she works exclusively and regularly in a 200 square foot room, so her business percentage is 10%.

Under the simplified method her deduction is 200 square feet times $5, which is $1,000. No depreciation is taken and no records of household costs are needed.

Under the actual expense method she adds up the indirect costs of running the home for the year: mortgage interest $12,000, property tax $4,000, homeowners insurance $1,600 and utilities $3,400, totaling $21,000. Ten percent of that is $2,100. She also had a $400 direct cost, repainting the office, deductible in full, and depreciation on the business portion of the house comes to $900. Her deduction is $3,400.

So the actual method is worth $2,400 more this year. The other side of the ledger arrives when she sells the house: the $900 of depreciation, and every year of it she claims in future, comes out of her home-sale exclusion and is taxed as unrecaptured section 1250 gain. Under the simplified method that figure is deemed to be zero and nothing accumulates.

One more variation on the same facts. If Naledi's business had generated only $1,500 of gross income from the home after her non-home business deductions, both methods would be capped at $1,500. Under the actual method the remaining $1,900 would carry forward to a later actual-expense year. Under the simplified method it would simply be lost.

What it does well

• It recognizes a real cost. Someone running a business from home is genuinely consuming part of the house for it, and the deduction reduces both income tax and, because it reduces net profit on Schedule C, self-employment tax.
• The simplified method removes almost all of the recordkeeping objection: a tape measure and one number.
• The administrative-office branch of the principal place of business test is broader than most people assume, so trades and clinicians who work elsewhere all day often qualify.
• The election is annual, so a taxpayer can use the simplified method in lean years and actual expenses in a year with heavy household costs.

Limits and cautions

• Employees cannot claim it at all, permanently, and a great deal of published guidance still describes that as temporary.
• The exclusive use test is unforgiving. A space that doubles as a guest room or a family computer corner produces nothing, and the deduction is not prorated for partial personal use.
• The actual expense method creates depreciation that reduces the home-sale exclusion later, measured by what was allowable rather than what was claimed, so the cost arrives even for someone who never took the deduction they were entitled to.
• The deduction cannot create or increase a business loss, and under the simplified method any amount the income limit disallows is gone rather than carried forward.
• It is not available for a hobby or for managing your own investments, because neither is a trade or business.
• Allocating a large share of a home to business use also complicates the calculation if part of the home is rented, since the same area cannot be used for both.