How the home office deduction works
If you're self-employed and use part of your home regularly and exclusively for your business, you can deduct expenses related to that space on Schedule C. It reduces both your income tax and your self-employment tax, which makes it one of the highest-leverage deductions freelancers have.
The IRS gives you two methods to calculate it, and you get to pick whichever one produces the bigger deduction each year.
The simplified method
The simplified method is exactly what it sounds like. You multiply your office square footage by $5, capped at 300 square feet. That means the maximum deduction is $1,500. You don't track actual expenses, you don't calculate depreciation, and you don't have to recapture anything when you sell your home.
Use the simplified method if: your rent and utilities are low, you don't want the paperwork, or your office is small (under about 150 square feet).
The regular method
The regular method deducts a percentage of your actual home expenses. The percentage is the square footage of your office divided by the total square footage of your home. If your office is 200 square feet in a 2,000 square foot home, that's 10 percent. You then deduct 10 percent of your rent, utilities, insurance, repairs, and depreciation.
Use the regular method if: your rent is high, your office is a significant share of your home, or you live in an expensive housing market. It almost always beats the simplified method in high-cost areas.
Regular and exclusive use test
This is the part that trips people up. To claim the deduction, your office space must be used regularly for business and exclusively for business. The dining table that doubles as your desk does not qualify. A spare bedroom used only for work does. A corner of the living room with a desk can qualify if you treat it as a dedicated work zone and don't let the kids do homework there.
You don't need four walls and a door. You just need a clearly defined area used only for work.
Worked example
You rent a 1,800 sq ft apartment for $2,000/month ($24,000/year). You use a 200 sq ft spare bedroom exclusively as your office. You also pay $3,600/year in utilities, $1,200 in renters insurance, $900 for internet, and $500 in minor repairs.
Business use percentage: 200 ÷ 1,800 = 11.1%
Simplified method: 200 × $5 = $1,000
Regular method: 11.1% × ($24,000 + $3,600 + $1,200 + $900 + $500) = 11.1% × $30,200 = about $3,356
The regular method wins by about $2,356. At a 30% marginal tax rate (income + SE), that's roughly $707 in actual tax savings. Worth the recordkeeping.
Common mistakes
People claim 100 percent of their internet even though they also use it for Netflix. They include the entire mortgage payment instead of just the interest. They forget that if they own, they have to recapture depreciation when they sell the home (the simplified method avoids this). And they ignore the regular and exclusive use test, which is the first thing an auditor will check.
Keep a simple folder: a photo of the space, a floor plan with the office marked and measured, and a spreadsheet of annual expenses. That's all you need.
Frequently asked questions
Who qualifies for the home office deduction?
Self-employed people who use part of their home regularly and exclusively as their principal place of business. W-2 employees don't qualify (the deduction was suspended for employees by the Tax Cuts and Jobs Act).
What is the simplified method?
You deduct $5 per square foot of office space, up to 300 square feet ($1,500 maximum). No expense tracking, no depreciation.
What is the regular method?
You deduct a percentage of your actual home expenses equal to the percentage of your home used for business.
Can I switch methods year to year?
Yes. Pick whichever gives you the bigger deduction each year.
Will it trigger an audit?
No. The IRS has explicitly said claiming a legitimate home office deduction does not raise audit risk.