You work from a spare bedroom, a corner of the dining room, or a converted garage. Every month you pay rent or a mortgage, electricity, and internet, yet when tax time comes you are not sure whether any of it counts. Many owners skip the home office deduction out of fear of an audit, while others claim it incorrectly and create real risk. This guide explains how the deduction works so you can claim what you are entitled to and keep records that support it.
Who Qualifies for the Home Office Deduction?
The IRS sets two core tests, described in IRS Publication 587. Your home workspace must be used regularly and exclusively for business, and it must be your principal place of business (or a place where you meet clients in the normal course of business).
- Exclusive use: The space or a clearly defined part of the room is used only for business. A desk in the living room that doubles as a family computer area generally fails this test.
- Regular use: You use the space on an ongoing basis, not occasionally.
- Principal place of business: This includes a home office used for administrative or management work when you have no other fixed location where you do substantial admin work.
- Self-employed or business owner: Sole proprietors, single-member LLCs, and partners can generally claim it. Since 2018, W-2 employees cannot deduct home office costs on their federal returns.
Exceptions to exclusive use exist for storing inventory and for daycare facilities, so check Publication 587 if either applies to you.
Simplified Method vs. Regular Method
You can choose between two ways to calculate the deduction each year.
The simplified method
The IRS lets you deduct $5 per square foot of home office space, up to 300 square feet. That caps the deduction at $1,500. There is no depreciation to track and no need to allocate utilities or insurance, which makes it quick. Example: a 150-square-foot office produces a $750 deduction.
The regular (actual expense) method
You calculate the percentage of your home used for business and apply it to eligible home expenses. If your office is 150 square feet in a 1,500-square-foot home, the business-use percentage is 10%. You then apply 10% to costs such as:
- Mortgage interest or rent
- Property taxes
- Homeowners or renters insurance
- Utilities (electricity, gas, water, trash)
- Repairs and maintenance affecting the whole home
- Depreciation on the business portion if you own the home
Suppose your annual qualifying home expenses total $24,000. At 10%, the deduction is $2,400, which is $900 more than the simplified method would give in this example. The regular method requires Form 8829 and more careful records, but it often yields a larger deduction for owners with higher housing costs.
Which should you choose?
You can switch between methods from year to year. The simplified method suits renters with modest costs or owners who want minimal paperwork. The regular method usually pays off when your housing costs are high. One caution: if you own your home and use the regular method, depreciation taken may be recaptured as taxable gain when you sell, so discuss that with your CPA before choosing.
How to Claim the Deduction Step by Step
- Confirm eligibility. Make sure the space meets the exclusive and regular use tests.
- Measure the space. Record the square footage of the office and of the entire home.
- Gather expenses. Collect mortgage or rent statements, utility bills, insurance, and property tax records.
- Pick a method. Run both calculations and compare the results.
- Report it. Sole proprietors report the deduction on Schedule C (the simplified method is entered directly; the regular method flows from Form 8829).
- Respect the income limit. The deduction generally cannot exceed the gross income from the business use of your home, though some unused amounts may carry forward under the regular method.
Recordkeeping That Protects You
The deduction itself is legitimate, and claiming it correctly is not an audit trigger by itself. What creates trouble is a lack of documentation. Keep a floor plan or dated photos of the office, your measurements, and copies of the bills you used. Categorize home office costs in your accounting software, such as QuickBooks or Xero, so the numbers are ready at year end. Our bookkeeping services include tracking these items throughout the year, so you are not hunting for utility bills in April.
Common Mistakes to Avoid
- Claiming a space that the family also uses for personal activities.
- Deducting 100% of home internet or utilities instead of the business-use portion.
- Forgetting that a separate business line or dedicated phone can be deducted fully when used only for business.
- Mixing personal and business payments, which blurs your records. A dedicated business account helps, and our services can help you set this up.
- Using the simplified method but also deducting actual home expenses for the same year.
Frequently Asked Questions
Does the home office deduction increase my audit risk?
Claiming a legitimate deduction with solid records is not something to avoid. The IRS looks for unsupported or inflated claims, so accurate measurements and documentation matter most.
Can I claim a home office if I rent?
Yes. Renters can use either method. Under the regular method, you apply your business-use percentage to rent and renters insurance, though there is no depreciation.
Can I claim the deduction if I also work at a client site?
Possibly. If your home office is where you handle administration and management and you have no other fixed place to do that work, it can still qualify as your principal place of business.
Can an S corporation owner take this deduction?
Not directly in the same way. S corporation owner-employees typically use an accountable plan so the company reimburses home office costs. This is a good question for your CPA.
This article is general information for US small businesses and is not tax advice. Rules change and individual circumstances differ, so consult a qualified CPA or tax professional before filing.
Want to be sure your home office costs are tracked and deducted correctly? Contact Ask For CPA and let our team keep your books audit-ready. You can also review our pricing.
