Home Office Deduction Calculator
Compare the IRS simplified ($5/sqft) and actual-expense methods for your home office deduction.
Square footage used regularly + exclusively for business
Mortgage interest or rent, utilities, insurance, repairs
Your home office deduction
Recommended: Actual expenses
$2,400
Saves ~$528 in tax at your 22% rate
Simplified method
$750
$5/sqft · saves ~$165 in tax
Actual expenses
$2,400
10.0% of expenses · saves ~$528 in tax
Business use
10.0%
150 of 1,500 sqft
Two IRS tests must both be true: (1) the space is used regularly for business and (2) it's used exclusively for business — no kitchen-table-by-day-dinner-table-by-night arrangements. The space also has to be your principal place of business or where you regularly meet clients.
Homeowners: actual-method depreciation has a catch. The portion of home depreciation you deduct each year is subject to recapture when you sell — it's added back as taxable income at up to 25% even if the sale qualifies for the $250k/$500k home-sale exclusion. The simplified method avoids this entirely. Consult a CPA before committing to actual.
Started mid-year? Prorate the deduction for the months you actually used the space for business — multiply the numbers above by (months used ÷ 12). If you took a long break (say, July to September), only the months of qualifying use count.
W-2 employees can't claim this. The Tax Cuts and Jobs Act (2017) eliminated the home-office deduction for W-2 employees through 2025. Only self-employed workers and independent contractors (1099) qualify under current law.
How to use this calculator
- Enter your office area in square feet — the part of your home used regularly and exclusively for business.
- Enter your total home area — used to compute the business-use percentage for the actual-expenses method.
- Enter annual home expenses — rent or mortgage interest, utilities, insurance, repairs. Not for the simplified method, but the actual method needs it.
- Pick your marginal tax rate — for estimating the tax savings (the deduction itself doesn’t change).
The calculator returns both methods side-by-side with a recommendation for whichever yields the larger deduction.
How it works
The IRS allows two methods. You pick whichever benefits you more.
Simplified method
A flat $5/sqft, capped at 300 sqft → maximum deduction $1,500.
A 150 sqft home office: 150 × $5 = $750. A 400 sqft home office: capped at 300 × $5 = $1,500.
No tracking of home expenses required. Picks itself up in roughly 10 seconds at tax time.
Actual-expenses method
Business-use percentage × total home expenses.
For a 150 sqft office in a 1,500 sqft home (10% business use) with $24,000 in annual home expenses:
10% × $24,000 = $2,400
The actual method usually wins for larger homes or higher expenses (mortgage interest, utilities, insurance, repairs all count). It loses for tiny offices in cheap rentals where the simplified $5/sqft does better.
Estimated tax savings
The deduction reduces your taxable income; the actual tax savings depend on your marginal rate. At 22% federal + 5% state = 27% combined, a $1,500 deduction saves about $405.
Frequently Asked Questions
Who qualifies for the home office deduction? ▾
Only self-employed workers and independent contractors (1099) qualify under current US tax law. W-2 employees are NOT eligible — the Tax Cuts and Jobs Act (2017) eliminated unreimbursed employee business expenses through 2025. To claim it as a self-employed worker you must use a specific area of your home regularly AND exclusively for business, and it must be your principal place of business or a place where you regularly meet clients.
What does 'exclusive use' mean? ▾
The space must be used solely for business — no kitchen-table-by-day-dinner-table-by-night arrangements, no spare bedroom that doubles as a guest room, no shared family computer. The IRS doesn't require a separate room, but the area you claim must not be used for any non-business purpose. A clearly defined corner of a room can qualify if it's truly dedicated to work.
Should I use the simplified method or actual expenses? ▾
The simplified method is faster and lower-audit-risk: $5/sqft × min(office sqft, 300) = max $1,500. The actual-expenses method requires tracking all home expenses (mortgage interest or rent, utilities, insurance, repairs) and multiplying by the business-use percentage. For most renters or smaller homes the simplified method gives roughly the same deduction with much less paperwork; for homeowners with large mortgages or expensive utilities, actual expenses often wins by a wide margin.
Can I deduct mortgage interest and property tax separately if I also use the simplified method? ▾
Yes — the simplified method is in addition to mortgage interest and property tax, which you'd already claim on Schedule A as itemised deductions. But you can't double-dip; the business-use portion you claim via simplified replaces the corresponding portion that would otherwise be itemised.
Does claiming the home office deduction trigger an audit? ▾
It used to have that reputation, but the simplified method introduced in 2013 was specifically designed to reduce audit complexity. Today, claiming the home office deduction with the simplified method is no riskier than any other Schedule C line item. Actual expenses get more scrutiny, especially if the business-use percentage is high or the home expenses are unusually large. Keep records: floor plan with measurements, photos, expense receipts.
Can I claim the deduction in a loss year? ▾
Sort of. The home office deduction can't be used to create or increase a business loss — it's limited to your gross business income minus other business expenses. Any unused portion carries forward to future years. So if your business made $0 profit, you can't claim a $1,500 home office deduction to create a $1,500 loss; you carry forward the $1,500 to use against a future year's profit.