Home Office Deduction for Small Business Owners: Regular vs Simplified Method

By Yarik Yarosh, CPA ·September 5, 2026 ·10 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

The home office deduction is one of the most commonly misunderstood deductions for small business owners. Many business owners either avoid claiming it (fear of audit) or claim it incorrectly (deducting personal expenses). The deduction is straightforward if the two requirements are met: (1) regular and exclusive use of a specific area for business, and (2) the home is the principal place of business or a place where the taxpayer regularly meets clients. The deduction itself is often modest, but for business owners who drive to clients, a qualifying home office carries a second, larger benefit: it can convert commuting miles into deductible business miles (see below).

✓Key takeaway

Home office deduction basics:

Who qualifies:

Self-employed business owners (Schedule C) who use part of their home regularly and exclusively for business
S-Corp owners through an accountable plan (the S-Corp reimburses the owner for the home office expenses, see the accountable plan article)
W-2 employees do NOT qualify (TCJA eliminated the unreimbursed employee expense deduction, and the OBBBA made the elimination permanent)

Regular and exclusive use requirement:

The space must be used REGULARLY (not occasionally) for business
The space must be used EXCLUSIVELY for business (a spare bedroom that doubles as a guest room does NOT qualify)
A dedicated desk in a corner of a room CAN qualify if that area is used exclusively for business (the “separately identifiable space” test)
A detached structure (garage converted to an office, separate studio) qualifies even without exclusivity if used regularly for business
Two exceptions to the exclusive-use rule: storage of inventory or product samples (the home must be the sole fixed location of the business), and licensed daycare facilities (the space can be used for daycare during business hours and personal use at other times, using a time-space percentage instead of a strict exclusive-use test)

Two calculation methods:

Simplified method:

$5 per square foot of home office space
Maximum: 300 square feet ($1,500 deduction)
No depreciation calculated (no recapture when the home is sold)
No tracking of actual expenses required
Mortgage interest and property taxes remain fully deductible on Schedule A under this method (they are not reduced by the business allocation, unlike under the regular method)
Simple, but often produces a much smaller deduction than the regular method

Regular method (Form 8829):

Calculate the business use percentage: home office square footage / total home square footage
Apply that percentage to actual home expenses:
- Mortgage interest (or rent)
- Real property taxes
- Homeowners/renters insurance
- Utilities (electric, gas, water, internet)
- Repairs and maintenance (whole-house repairs are apportioned; repairs to the office itself are 100% deductible)
- Depreciation on the home (only the building, not the land)
- HOA fees
The deduction is limited to the gross income from the business (it cannot create a loss, but unused amounts carry forward)

Depreciation note: The regular method requires depreciating the business-use portion of the home over 39 years (residential rental property is 27.5 years, but a home office in a home used by the owner is 39 years under Rev. Proc. 2013-13). This depreciation reduces basis and may trigger depreciation recapture (taxed at 25%) when the home is sold. Many business owners avoid the regular method for this reason, but the annual deduction often far exceeds the simplified method.

Which method produces a larger deduction?

Hypothetical example

Round numbers. For current guidance, see IRS Publication 535 (Business Expenses). A self-employed consultant works from a 200 sq ft home office in a 2,000 sq ft home. Business use percentage: 10%.

Simplified method:

200 sq ft x $5 = $1,000

Regular method: Annual home expenses:

Mortgage interest: $12,000
Real property taxes: $5,000
Homeowners insurance: $1,500
Utilities (electric, gas, water): $4,800
Internet: $1,200
Repairs/maintenance (new HVAC filter, lawn service, gutter cleaning): $1,500
HOA fees: $0
Depreciation (home value $300,000, land $75,000, building $225,000):
- Business portion: $225,000 x 10% = $22,500
- Annual depreciation: $22,500 / 39 = $577
Total home expenses: $26,577
Business use (10%): $2,658

Regular method deduction: $2,658 Simplified method deduction: $1,000 Difference: $1,658/year

At a 24% tax rate + 15.3% SE tax (for a sole proprietor), the $1,658 difference saves approximately $650 in tax per year. Over 10 years, that is $6,500 in additional tax savings from using the regular method.

Depreciation recapture trade-off: The depreciation component is $577/year. Over 10 years: $5,770 in total depreciation claimed. When the home is sold, this $5,770 is recaptured as ordinary income at a maximum rate of 25% under IRC 1250 = $1,443 in additional tax at sale. The income tax + SE tax saved over 10 years ($6,500) exceeds the recapture ($1,443) by $5,057. The regular method wins.

The IRC 121 home sale exclusion ($250,000 single / $500,000 MFJ) still applies to the gain on the entire home, including the office portion, as long as the office is inside the home rather than a separate structure. Only the depreciation actually taken is recaptured, not the full gain attributable to the office space. Renters do not have a depreciation recapture issue at all (there is no building to depreciate), so the regular method is almost always the better choice for renters with a qualifying home office.

The higher a homeowner’s or renter’s actual housing costs, the wider the gap in favor of the regular method: a $1,200/month renter with a 250 sq ft office (12.5% business use) sees roughly an $888 larger deduction under the regular method than the simplified method, while a renter paying $3,500/month with the same office size sees a gap of roughly $4,525, because the simplified method stays capped at $1,500 regardless of actual costs.

When the simplified method is better:

The home office is very small (under 100 sq ft) and home expenses are low (renter with low rent)
The business owner plans to sell the home soon and wants to avoid depreciation recapture entirely
The business owner does not want to track actual expenses (the simplified method requires only the square footage)
The business owner’s net profit is near zero and the home office deduction would be limited anyway

As a rule of thumb, the crossover point where the simplified method starts to beat the regular method is roughly when total home expenses run under $15,000/year and the office is under 300 square feet. Above that, the regular method (established for the $5/sq ft simplified alternative under Revenue Procedure 2013-13) tends to win.

S-Corp owner approach: S-Corp owners cannot deduct the home office on their personal return. Instead, the S-Corp reimburses the owner through an accountable plan. The S-Corp deducts the reimbursement as a business expense, and the owner receives it tax-free. The calculation is the same as the regular method, but the deduction flows through the S-Corp’s books, not the owner’s Schedule A. An S-Corp can also rent the office space directly from the owner instead of using an accountable plan (the S-Corp deducts the rent, the owner reports rental income on Schedule E), but this creates taxable income for the owner and carries additional rules, so the accountable plan is usually the simpler, more tax-efficient route.

The commuting mileage conversion (a hidden second benefit): A qualifying home office is not just a deduction on its own, it also changes how the IRS treats driving. Without a home office, driving from home to a regular work location is commuting and is not deductible; only trips between business locations count. Once the home office is established as the principal place of business, the home itself becomes a business location, so every trip from home to a client site (and back) becomes deductible business mileage instead of non-deductible commuting. For a business owner who drives regularly to clients, this reclassification is often worth more than the home office deduction itself, because it applies to every mile driven, not just to the office square footage.

Common audit triggers:

Claiming 50%+ of the home as business use (very large home offices are scrutinized)
Deducting a home office when the business has a separate office or shop
Claiming a bedroom as a home office without evidence of exclusive business use
Home office deduction that exceeds business income (the deduction is limited to gross income from the business)

Documentation:

Floor plan or diagram showing the office area measurements
Photos of the dedicated workspace (showing it is set up for business, not personal use)
Receipts for mortgage/rent, insurance, utilities
A log is not required, but consistent use of the space for business should be evident from the nature of the business (a consultant who works from home full-time is a clear case)

Illustrative numbers only, not a real client and not advice for your facts.

The commuting mileage conversion: often the bigger benefit

Hypothetical example

Round numbers. A mobile consultant drives to client sites and logs 12,000 business miles per year.

Without a home office: Driving from home to the first client of the day (the regular workplace) is commuting and is not deductible. Driving from that client back home ultimately is also commuting. Only the driving between clients during the day counts as business mileage.

Deductible miles: approximately 5,000 (client-to-client only)
Mileage deduction: 5,000 x $0.70 = $3,500

With a qualifying home office as the principal place of business: The home office is now a business location, so every trip from home to a client (and back) is deductible.

Deductible miles: 12,000 (all trips from home to clients and back)
Mileage deduction: 12,000 x $0.70 = $8,400

Additional mileage deduction from having a home office: $8,400 - $3,500 = $4,900

At a 24% income tax rate plus 15.3% SE tax (39.3% combined), that additional $4,900 is worth $1,926/year in tax savings, on top of whatever the home office deduction itself produces. For plumbers, electricians, consultants, and photographers who drive to client sites daily, this mileage conversion is frequently the larger of the two benefits, and it scales with miles driven rather than square footage, so it can be worth far more than the $1,000 to $2,658 deduction shown above.

Illustrative numbers only, not a real client and not advice for your facts.

What are the two methods for calculating the home office deduction?

The simplified method allows $5 per square foot of your home used for business, up to 300 square feet, for a maximum deduction of $1,500. The regular method calculates actual expenses (mortgage interest or rent, property taxes, utilities, insurance, repairs, depreciation) based on the percentage of your home used exclusively and regularly for business. The regular method requires more recordkeeping but often produces a larger deduction, especially for larger office spaces or expensive homes. Under the regular method, the home office deduction cannot create a business loss, but excess deductions carry forward to the next year. Employees working from home cannot claim the home office deduction under current law (the deduction was suspended for employees by the TCJA through 2025), but self-employed individuals and independent contractors remain eligible.

Related guides:

Can you claim a home office deduction if you also rent office space?

Yes, having a separate office doesn’t automatically disqualify your home office deduction as long as your home office meets the regular and exclusive use test under IRC 280A. The home office must be your principal place of business or a place where you regularly meet clients, even if you also maintain another workspace. Under the Soliman test from the Supreme Court decision, a home office qualifies as your principal place of business if you perform substantial administrative or management activities there and have no other fixed location for those activities. The simplified method allows a $5 per square foot deduction up to 300 square feet ($1,500 maximum), while the regular method requires tracking actual expenses and calculating the business-use percentage of your home.

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Cite this page

Yarik Yarosh, CPA. "Home Office Deduction for Small Business Owners: Regular vs Simplified Method." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-home-office-deduction-deep-dive

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.