Important Stuff Upfront
- The IRS lets you deduct your home office using either a simplified method ($5 per square foot, max 300 sq ft = $1,500 per year) or the regular method (your actual expenses).
- The simplified method is faster but often undervalues what you actually spend. If your office is 200 square feet, it caps you at $1,000 per year, even if utilities, depreciation, and rent are much higher.
- The regular method requires detailed record keeping but frequently saves more money. A 300 sq ft office in a 1,000 sq ft apartment renting for $1,500 a month works out to about $6,000 in annual deductions, four times the simplified cap.
- The choice affects your bottom line: pick the method that gives you the larger deduction, and know that you can switch methods in different years.
One of the most underused deductions for freelancers and self-employed workers is the home office write-off. If you use part of your home regularly and exclusively for business, the IRS allows you to deduct a portion of your rent, utilities, insurance, and depreciation. The catch is choosing the right method. The simplified approach is a quick $5 per square foot. The regular method is more work, but often worth thousands more.
Quick comparison: which deduction is larger?
The answer depends on three factors: the size of your office compared with the whole home, your rent or home costs, and your total household utilities and insurance. The table below works each case out from stated assumptions, so you can see where the numbers come from. Every renter row assumes utilities of $1,800 a year and renters insurance of $180 a year, the same figures used in the worked example further down.
| Situation (assumptions) | Simplified Method | Regular Method (estimated) | Winner |
|---|---|---|---|
| 100 sq ft in a 1,000 sq ft apartment (10%), rent $1,200/mo | $500/year | $1,638/year | Regular |
| 180 sq ft in a 900 sq ft apartment (20%), rent $1,600/mo (Alex, below) | $900/year | $4,236/year | Regular |
| 200 sq ft in a 1,500 sq ft apartment (13.3%), rent $1,800/mo | $1,000/year | $3,144/year | Regular |
| 300 sq ft in a 1,000 sq ft apartment (30%), rent $1,500/mo | $1,500/year (capped) | $5,994/year | Regular |
| 150 sq ft in a 1,000 sq ft owned home (15%), $300k home with $250k building; mortgage interest $12,000, property tax $3,000, utilities $2,400, insurance $1,200, repairs $600 | $750/year | $3,842/year ($2,880 of expenses plus $962 depreciation) | Regular |
| 100 sq ft in a 2,000 sq ft paid-off home (5%), $250k building; property tax $3,000, utilities $3,000, insurance $1,500, repairs $1,000 | $500/year | $746/year ($425 of expenses plus $321 depreciation) | Close |
Regular-method figures use a full year of depreciation over 39 years on the business share of the building only (IRS Publication 587). In the first year you use the office, depreciation is smaller because it starts in the month the office is placed in service. For homeowners, the mortgage interest and property tax portions would be deductible on Schedule A anyway if you itemize, so the real advantage of the regular method is smaller for anyone who itemizes.
For most renters, the regular method wins because rent is a large expense and every dollar of it counts toward the business share. The simplified method comes close only when the office is a small slice of a large home with low costs, like the paid-off house in the last row.
Understanding the simplified method
The simplified method is deliberately simple. You measure your office in square feet, multiply by $5, and that is your deduction for the year. Maximum of 300 square feet, so the ceiling is $1,500 per year.
There are no receipts to keep, no depreciation to calculate and no utilities to allocate. This makes sense for small offices or if your home office is part time and you want to avoid the record-keeping burden.
When simplified makes sense
Choose simplified if the two methods come out close (typically a small office in a large home with low costs, like the paid-off house in the table) or if you cannot document a full year of bills. If you own your home and switch to it after using the regular method, you claim no home office depreciation for that year, and your mortgage interest and property taxes go on Schedule A instead (if you itemize).
Understanding the regular method
The regular method requires you to calculate the percentage of your home used for business, then deduct that same percentage of your housing-related expenses. The categories are:
- Rent or mortgage interest (not principal, only interest)
- Property taxes (if you own)
- Utilities (electricity, gas, water, trash, internet)
- Home insurance
- Repairs and maintenance (fixing a leak, painting, cleaning)
- Depreciation (if you own; renters skip this)
You calculate a "business use percentage" based on square footage. If your home is 2,000 sq ft and your office is 200 sq ft, that is 10 percent. You then deduct 10 percent of all the categories above.
Head to head: a worked example
Alex is a freelance copywriter working from home in an apartment in Denver.
Alex's home office setup
- Office size: 180 square feet (a spare bedroom)
- Apartment total size: 900 square feet
- Business use percentage: 180 ÷ 900 = 20 percent
- Monthly rent: $1,600
- Annual rent: $19,200
- Renters insurance: $180/year
- Utilities (estimated): $1,800/year
- Rent: $19,200 × 20% = $3,840
- Insurance: $180 × 20% = $36
- Utilities: $1,800 × 20% = $360
- Total Regular Deduction: $4,236
- Square footage: 180
- Rate: $5 per sq ft
- 180 × $5 = $900
- Total Simplified Deduction: $900
The simplified method is easy, but for anyone renting or owning a home with moderate to high housing costs, choosing it can mean giving up a deduction several times larger.
Depreciation and homeowners
If you own your home, the regular method includes depreciation. You depreciate only the business share of the building (not the land), and a home office counts as nonresidential real property, so the recovery period is 39 years (IRS Publication 587). Take a $300,000 home where the building is worth $250,000: if your office is 15 percent of the home, the depreciable basis is $37,500, which works out to about $962 in depreciation per year. This number can be recaptured when you sell your home, so consider the long-term tax implications with a CPA before claiming it.
How to choose: a simple decision tree
If your office is under 100 sq ft and your rent is under $1,000 per month, try both calculations and see which is larger. In most cases, even then, the regular method wins. If your office is over 150 sq ft, the regular method almost always wins, sometimes by $2,000 or more per year.
One more consideration: record-keeping. The regular method requires you to save utility bills, insurance statements, and rent receipts. If you already track these for your business (which you should), the cost of the regular method is just doing the math. A free expense tracker with receipt capture, such as the one in Self Employment Toolkit (from the same publisher as this site), keeps those bills in one place through the year. If you do not, you will need to gather a year of statements to claim it retroactively.
Can you switch between methods?
Yes. You can use simplified one year and regular the next. You cannot use both in the same tax year, but you can change your approach as your situation changes. If you upgrade your office size, buy a home, or move to a higher-rent area, recalculate both methods and pick the larger deduction.
Why does this matter for your tax bill?
If the regular method gives you $3,000 per year instead of $900, that extra $2,100 in deductions reduces your self-employment income. Self-employment tax on $2,100 is about $297 (15.3 percent of 92.35 percent of the amount). Income tax falls too: by about $187 for a single filer in the 12 percent bracket, or about $343 in the 22 percent bracket, after the 20 percent qualified business income deduction is accounted for. That puts the federal saving at roughly $484 to $640 a year, or about $2,400 to $3,200 over five years, before any state income tax.
Want to calculate your self-employment taxes with a specific home office deduction? Use our free calculator.
Calculate My SE TaxNext steps
If you qualify for a home office deduction (your space is used regularly and exclusively for business), spend 15 minutes calculating both the simplified and regular methods. Pull last year's utility bills, rent or mortgage statements, and insurance documents. Plug the numbers into a simple spreadsheet. Then take the larger number to your tax preparer or accountant. Do not default to simplified just because it is easier; for a larger office, the regular method can be worth thousands of dollars more in deductions.
Disclaimer
This article provides estimates and general information only. Tax laws and rates may change. Individual circumstances vary widely. This content does not account for all possible deductions, credits, or state taxes. Homeowner depreciation in particular has long-term tax implications when you sell your home. For personalized advice on which method suits your situation, consult with a qualified tax professional. For IRS resources on home office deductions, visit the IRS home office deduction page.