The home office deduction lets qualifying self-employed people deduct a portion of their housing costs as a business expense. The rules are strict, and employees lost access to the deduction entirely under the 2017 tax law.
Employees cannot take this deduction
This is the single most common misunderstanding about the home office deduction. If you receive a W-2 and your employer asked you to work from home, you cannot deduct a home office on your federal return. The Tax Cuts and Jobs Act of 2017 suspended the employee home office deduction through at least 2025, and the One Big Beautiful Bill Act extended the underlying tax structure that keeps it unavailable. There is no exception for pandemic-related remote work, hybrid arrangements, or employees who work from home by personal preference.
Some states (California, New York, Pennsylvania, and others) allow employees to deduct unreimbursed business expenses on the state return. Check your state rules separately.
Who can deduct a home office
You may deduct a home office if:
- You are self-employed (sole proprietor, freelancer, partner in a partnership, or an S corporation shareholder who performs services for the corporation)
- You use part of your home regularly and exclusively for business
- The space is your principal place of business, or a place where you meet clients, or a separate structure used in your business
The principal place of business test is met if you use the home office to conduct administrative or management activities and there is no other fixed location where you do those activities.
The regular and exclusive use requirement
“Regular” means you use the space on a consistent basis, not occasionally. “Exclusive” means that part of your home is used only for business, not for personal activities. A desk in a bedroom where you also sleep does not qualify. A dedicated room used only as an office, with no personal furniture or activities, does qualify.
There are two exceptions to the exclusive use rule:
- A daycare facility that meets state licensing requirements
- Storage of inventory or product samples for a retail or wholesale business if the home is the only fixed business location
Calculating the deduction: simplified method
The simplified method, introduced by the IRS to reduce recordkeeping, calculates the deduction as $5 per square foot of your home office, up to 300 square feet. The maximum deduction under this method is $1,500 per year.
This method requires no depreciation calculations and no carryover. It is straightforward and works well for small home offices.
Calculating the deduction: regular method
The regular method uses your actual home expenses and the percentage of your home devoted to business.
Step 1: Measure your home office square footage and divide by the total square footage of your home to get the business-use percentage. For example, a 200 sq ft office in a 2,000 sq ft home equals 10%.
Step 2: Multiply that percentage by your allowable home expenses:
- Mortgage interest or rent
- Real estate taxes
- Utilities (electricity, heat, water)
- Homeowner’s or renter’s insurance
- Repairs and maintenance for the entire home
- Depreciation (if you own your home)
Step 3: Direct expenses that benefit only the office (painting the office, a dedicated business phone line) are deducted at 100%.
For a homeowner paying $18,000 annually in mortgage interest, taxes, insurance, and utilities, a 10% office would generate $1,800 in indirect expenses. Add in direct expenses for a total deduction. This method requires Form 8829.
Depreciation note: If you own your home and use the regular method, you must claim depreciation on the office portion. When you sell the home, the depreciated amount is subject to recapture as ordinary income. This is a long-term cost some owners overlook.
Deduction limit and carryover
Your home office deduction cannot exceed your net profit from the business that uses the office. You cannot use the home office deduction to create or increase a business loss. Any disallowed amount under the regular method carries forward to the following year. The simplified method does not allow carryovers.
What to document
Keep the following in case of audit:
- Floor plan or diagram of your home showing the office dimensions
- Total square footage of your home
- Receipts for all home expenses you’re allocating
- Evidence of business use (client emails, appointment logs, business bank statements showing home-based activity)
The exclusive use requirement is the most common audit issue. If your “office” is also a guest room or has a television, it won’t survive scrutiny.