Small Business Home Office Deduction Guide

If you plan to claim this deduction, this article provides general information about US federal tax rules, not personal tax or financial advice. Tax law is complicated, and each person's situation differs. Speak with a qualified tax professional before claiming a deduction.

A freelance consultant with a 120-square-foot dedicated office in Austin could deduct $600 from her business income for 2025 using the IRS simplified method. With the regular method, an office taking up 15% of her 900-square-foot apartment might produce a deduction of $1,800 or more for rent, utilities, and internet. The IRS instructions do not make either result obvious. This guide breaks down the methods and the steps for claiming the deduction.

Two Requirements for Qualifying

Self-employed people who file Schedule C may claim the home office deduction. That includes sole proprietors, freelancers, independent contractors, and single-member LLC owners treated as sole proprietors. Federal law does not currently let W-2 employees deduct unreimbursed work-from-home costs. If you earn both self-employment income and W-2 wages, only the self-employment work may qualify.

Both conditions must be met for a space to qualify:

Regular and exclusive use. You must use the space regularly, rather than occasionally, and exclusively for business, with no personal use. A spare bedroom used mainly as an office but turned into a guest room when family visits fails the exclusive-use test. A dedicated room used only for client work passes it. The IRS applies this rule strictly and gives no partial credit for a space that also serves personal purposes.

Principal place of business. Your home office must be your main place of business. For most self-employed people who mainly work from home, this is simple. The question becomes more involved if you also rent a commercial office. Your home office may still qualify when you handle administrative or management work there and have no other fixed place for those tasks. For example, a plumber working at client locations may qualify if scheduling, billing, and bookkeeping happen in the home office.

Method One: Simplified

The IRS created the simplified method in 2013 to make recordkeeping easier for small home offices. The formula is $5 per square foot of qualifying space, capped at 300 square feet. The largest yearly deduction available through this method is $1,500.

Why choose the simplified method:

• You do not need to track actual home costs for the office percentage. Only the office's square footage matters.
• When your business income is below the deduction amount, your deduction cannot exceed net business income. Under the simplified method, the unused amount does not carry into future years.
• Homeowners who use the simplified method do not have to calculate depreciation for the office, avoiding possible depreciation recapture when they sell the home.

This method may suit you when the office is small, under 300 square feet, your actual home costs are modest, or you value less recordkeeping more than maximizing the deduction.

Method Two: Regular

The regular method, also known as the actual expense method, uses your home's actual costs and assigns them according to the share used for business.

Calculate the business-use percentage by dividing the qualifying office's square footage by your home's total square footage. An 180-square-foot office in a 1,200-square-foot home has a business-use percentage of 15%.

Apply that percentage to indirect expenses, which the IRS defines as costs benefiting the whole home:

• Rent, if renting
• Utilities, including electricity, gas, and heat
• Homeowners or renters insurance
• Internet used for business, or the full bill for a dedicated business line
• Home security systems
• General repairs and maintenance
• Mortgage interest and real estate taxes, if you own, though these may be deductible elsewhere on your return
• Home depreciation for homeowners, calculated separately with IRS Form 8829

Costs limited to the office, such as painting that room or purchasing a dedicated desk, are direct expenses. They are 100% deductible and are not reduced by the business-use percentage.

Homeowners should note that the regular method requires yearly depreciation calculations for the business-use portion of the home. That creates a current deduction, but it may also lead to depreciation recapture when you sell. Recaptured depreciation is taxed as ordinary income rather than capital gains, and the tax effect of a sale may reduce part of the benefit from yearly deductions. If you own your home and are weighing the regular method, discuss depreciation recapture with a tax professional before choosing it.

Unlike the simplified method, the regular method lets you carry unused home office deductions into later years when they exceed your net business income.

Simplified or Regular: Which Fits?

Choose the simplified method when your office is 300 square feet or smaller and easy recordkeeping matters most, or when you own your home and want to avoid possible depreciation recapture.

The regular method may be better when your office is large, your actual home costs are substantial, or your income makes the deduction difference meaningful to your tax bill. Renters in expensive cities often receive a much larger deduction with this method.

You may change methods each year, but you cannot apply both methods to the same space in one year.

Records to Keep

With the simplified method, you only need records of your office's square footage and your home's total square footage. A basic floor plan, tape measure, and note kept in your files should do. Keep these records for the period you could be audited on the return, generally three years from the filing date.

For the regular method, save:

• All home expense receipts and bills for the year, including rent, utilities, and insurance
• Records of your home's total square footage and your office's square footage
• Homeowners: original purchase price, closing papers, and prior-year depreciation records, including IRS Form 8829
• Photos or a simple floor plan of the dedicated office

HiGeorge sorts and categorizes home office costs as they are paid during the year. At tax time, you can see a clear report of home office spending instead of searching through a year's worth of mixed transactions. That categorized information supplies what Form 8829 and Schedule C need.

Internet Expense Basics

Internet service is a frequent source of home office errors. When one connection serves both business and personal use, as it does for nearly everyone, only the business share is deductible. With the regular method, that share of the internet bill goes into the home office calculation. Some self-employed people instead claim a separate percentage as a direct business expense outside that calculation, using estimates based on time or usage. Both methods can make sense, depending on how you use the connection. A tax professional can help you document the allocation and apply it consistently.