How to Write Off Home Office Expenses Legally
This post is for educational purposes only and is not formal tax or legal advice. Tax rules change, and everyone’s situation is different, so verify the current IRS guidance and consider speaking with a qualified tax professional before filing.
If you’re wondering how to write off home office expenses legally, the starting point is whether your workspace and business use meet the IRS requirements. The deduction can be valuable for eligible self-employed taxpayers, but the rules are more specific than simply working from home.
The IRS home office deduction guidance explains the main requirements and the two methods available for calculating an eligible deduction.
Home office deductions can be useful for freelancers and other self-employed workers, but the rules are easy to misunderstand if you rely on assumptions.
Here’s what actually works.
Why the Home Office Deduction Gets Missed
Some freelancers avoid the deduction because they are unsure whether they qualify, while others misunderstand what can legitimately be claimed.
Both are mistakes.
The home office deduction can be legitimate when you meet the applicable IRS requirements. The key is to understand the rules that apply to your situation rather than guessing.
How to Write Off Home Office Expenses: Do You Qualify?
For many self-employed taxpayers, the home office generally needs to meet requirements around regular and exclusive business use, although there are exceptions and additional rules depending on the situation.
Regular use. You use the space for work consistently, not just occasionally when the couch feels crowded.
Exclusive use. This is the one that trips people up. The space has to be used only for work. Not work-and-guest-room. Not work-and-Peloton-corner.
Here’s a hypothetical example. Suppose Dana, a freelance illustrator, converts her 10×12 spare bedroom into a studio. Desk, drawing tablet, reference shelves, nothing else. A space set up this way may meet the exclusive-use requirement, assuming the other applicable requirements are met.
In contrast, a shared living-room workspace generally would not meet the exclusive-use requirement if the area is also used for personal or family activities. The same laptop, work and income do not change how the space itself is used.
Exclusive use is an important part of the home office rules, but it is not the only requirement to consider.
What Counts as a Home Office
- A spare bedroom converted into a dedicated workspace
- A basement corner walled off and used only for client work
- A garage studio set up exclusively for design or writing
- A closet-turned-office, as long as nothing else happens in there
- A defined nook in a larger room, if it’s clearly separated and used only for work
What Generally Does Not Qualify
- A kitchen table or other shared surface used for both work and personal activities
- A guest bedroom that doubles as an office when nobody’s visiting
- Your bed, your couch, or any shared family space
- A desk in the corner of your kid’s playroom
- Any space you also use for personal Netflix binges or gaming
If a workspace is also used personally, check the exclusive-use rules carefully before treating it as a qualifying home office.
Measuring Your Space (Without Losing Your Mind)
Grab a tape measure. Seriously, that’s it.
Measure the length and width of your dedicated space in feet. Multiply them together for square footage.
Dana’s studio came out to 120 square feet. Her whole apartment was 1,000 square feet. That’s 12% of her home used for business, and that percentage becomes important in a minute.
Write this number down somewhere. Keep it consistent year over year unless you actually move or remodel.
Simplified Method vs. Regular Method
This is where most freelancers freeze up. There are two ways to calculate this deduction, and picking the right one depends on your situation.
| Feature | Simplified Method | Regular Method |
|---|---|---|
| How it’s calculated | $5 per square foot of office space, subject to the applicable tax-year rules | Actual eligible expenses × business-use percentage |
| Maximum deduction | Generally limited to the applicable simplified-method cap | Based on eligible actual expenses under the applicable rules |
| Recordkeeping | Minimal | Extensive (receipts, bills, insurance) |
| Best for | May suit smaller offices or taxpayers who prefer simpler recordkeeping | May suit taxpayers with substantial eligible home expenses |
| Depreciation impact | Does not use depreciation in the same way as the regular method | May involve depreciation and related tax consequences for homeowners |
| Audit complexity | Generally simpler recordkeeping | More detailed recordkeeping is generally required |
The simplified method can be appealing when your workspace is small, your eligible expenses are modest, or you simply want less recordkeeping.
For a homeowner with a dedicated office and significant eligible home expenses, the regular method may produce a larger deduction, but the result depends on the actual numbers.
Neither method is “better.” It depends on your numbers.
When Simplified Wins
If your office is small or you prefer simpler recordkeeping, the simplified method can be attractive because the calculation is straightforward.
Dana’s 120 square feet under simplified comes to $600. Quick, clean, done.
When Regular Wins
If you own your home, have a larger dedicated space, or have substantial eligible home expenses, the regular method may produce a larger deduction.
You’ll need your actual eligible expenses and the applicable business-use calculation. Depending on your circumstances, this can involve items such as qualifying mortgage interest, property taxes, utilities, insurance and certain repairs, subject to the applicable IRS rules.
Run both methods with your actual numbers before you decide. Takes twenty minutes. Worth it.
What You Can Deduct Beyond the Square Footage
The home office percentage isn’t the whole picture.
- A portion of your internet bill, based on business use
- Office furniture and equipment bought specifically for work
- Software subscriptions tied directly to client projects
- A percentage of homeowners or renters insurance
- Repairs made specifically to the office space
That last one needs some care. Expenses for the entire home and expenses that relate specifically to the office may be treated differently under the applicable rules. For example, a repair that benefits only the office may be treated differently from a repair that benefits the whole house.
Keep the Claim Accurate and Documented
Claiming a home office deduction does not, by itself, mean that an audit will occur. The important thing is to claim only deductions you are entitled to and keep appropriate records.
A claim that is inconsistent with the facts of your business or living arrangement can create problems. For example, claiming a large percentage of a very small home as business space may warrant closer attention, particularly if the area is also used personally.
Keep it honest. Keep it documented.
Take a photo of your office setup once a year. Save your square footage calculation. Keep receipts if you’re using the regular method. If you use expense tracking software, it can also make it easier to keep receipts and business expenses organised.
That’s not paranoia. That’s just good bookkeeping.
A Practical Approach
If you’re new to this, the simplified method can be a straightforward starting point because it generally requires less detailed expense tracking.
Once your business grows and your space is genuinely dedicated to work, run the numbers on the regular method every year.
Measure your space accurately. Keep the room exclusive to work. Don’t let it become a hybrid guest-room-slash-office situation.
Following the rules and keeping good records can make the home office deduction a useful option when you qualify.
Don’t leave it on the table.
