After entered limit · eligibility pending
150 average allowable sq ft × $5 2025 & 2026 · Federal planningHome Office
Home Office
Deduction Estimator
Estimate the simplified home-office amount or compare supported actual costs for a rented home. Enter your space, qualifying months and income available to see how the area cap and income limit affect each method. This free tool assumes one constant-sized, exclusive principal office for a self-employed business. Homeowner actual expenses and special uses need separate review; these expense estimates are not tax savings.
Free, no sign-upVisible assumptionsChecked Oct. 9, 2026
YOUR SPACE. YOUR ASSUMPTIONS.
Free, no accountSee what each method includes.
Start with your office area. Add income and supported costs for a clearer estimate.
YOUR 2026 COMPARISONRenter
Amounts to review
Illustration: a 150 sq ft office in a rented 1,500 sq ft home. Eligibility is unconfirmed.
Eligibility is unconfirmed. Review exclusive use, principal-place rules and records before treating these amounts as deductions.
After entered limit · eligibility pending
10.00% shared costs + office-only repairsActual costs minus simplified amount$1,950.00
A larger expense estimate does not decide the better tax method. Review records, carryovers and your full return before choosing.
The calculation behind the cards
- Office / home area
- 150 / 1,500 sq ft
- Business share of home
- 10.00%
- Simplified monthly area cap
- 150 sq ft
- Qualifying months / 12
- 12 / 12
- Simplified before income limit
- $750.00
- Shared costs entered
- $27,000.00
- Shared costs × business share
- $2,700.00
- Office-only repairs entered
- $0.00
- Renter actual before limit
- $2,700.00
- Income available entered
- $50,000.00
What happens to amounts over the limit?
Simplified: $0.00 over the entered limit. That disallowed simplified amount cannot carry forward.
Renter actual: $0.00 over the entered limit. Actual operating expenses may carry forward subject to the rules; no prior or future carryover calculation is included.
Deduction amount ≠ tax savings. Choose one method for a given home/year; do not add both cards.
Records for your review
0/4 readyScope and assumptions in your summary
Federal calendar-year planning for one self-employed business, one home and a constant-sized exclusive principal office. Supports 2025/2026 simplified amounts and current-period renter operating expenses only. Eligibility and income available are user-reported. Excludes homeowner actual expenses, depreciation, mortgage interest, property taxes, casualty losses, capital improvements, equipment, prior carryovers, changing/shared areas, multiple homes/businesses, daycare/storage exceptions and employee claims. No full tax, QBI, self-employment-tax or tax-savings calculation. Costs must relate to the qualifying actual-use period. The simplified monthly count is not reapplied to those entered costs. Amounts round to cents for planning; tax returns may use whole dollars.
Year: 2026. Housing: renter. Eligibility: unknown. Qualifying simplified months: 12. Record readiness is self-reported and is not an eligibility check.
Published by IntegraFin Tax & Accounting. Rules checked October 9, 2026. Planning estimates only. integrafin.tax/home-office-deduction-calculator.
Review your home-office expenses with IntegraFin Try an illustration
HOW THE METHODS DIFFER
Space, costs and income all matter.
Check the use first
Confirm regular and exclusive use and the principal-place requirements. A spare room or a desk at home does not automatically establish eligibility.
Model the supported costs
Simplified uses capped area and qualifying months. Renter actual costs use the business share of qualifying-period shared bills plus supported office-only ordinary repairs.
Apply the income limit
Available income can reduce either supported amount. Unknown income remains visible as an unfinished part of the estimate. A result does not independently verify your eligibility.
Two illustrations with different limits.
Both use the supported renter scope, a constant office area and assumed eligibility. Figures are arithmetic examples, not client outcomes or method recommendations.
Full-year office: 150 sq ft
A 150 sq ft office in a 1,500 sq ft home gives a 10% share. Simplified is $750.00. Rent $24,000, utilities $2,400, insurance $300 and shared repairs $300 total $27,000; 10% gives $2,700.00. With $50,000 available income, neither modeled amount is limited.
Five qualifying months, $500 income available
A 400 sq ft office uses the 300 sq ft monthly simplified cap. 300 × 5/12 × $5 gives $625.00. A 20% share of $11,250 qualifying-period renter bills gives $2,250.00. Both modeled amounts are limited to $500.00. Do not prorate the already-period-specific bills again.
Home office deduction questions
How does the simplified home office deduction work?
The simplified method uses $5 per average monthly allowable square foot, capped at 300 square feet per qualifying month. A full year at that cap produces $1,500 before the income limit. This tool supports a constant office area; part-year use reduces the monthly average.
Can renters use the actual-expense method?
Eligible renters can allocate qualifying home costs by the office share of the home and add eligible office-only costs. This estimator supports rent, utilities, renters insurance and ordinary repairs for the qualifying actual-use period. It excludes improvements, equipment, casualty losses and prior carryovers.
Why does the homeowner actual method need a separate review?
An owner’s calculation may involve mortgage interest, property taxes, depreciation, basis and expense-ordering rules. Those can change the deduction and later tax consequences. This tool estimates the homeowner simplified method and does not display a partial expense allocation as a full homeowner actual deduction.
What income limit should I enter?
Use income attributable to the qualified home-office business minus other business expenses, before the home-office deduction. Do not subtract the half-SE-tax adjustment. If all business activity is attributable to the home, that can resemble profit before home-office costs. Allocation across locations needs review. Enter 0 for a loss, or leave blank if unknown.
Can I carry forward an amount limited by business income?
An unallowed current simplified-method amount cannot carry forward. Actual operating costs may carry forward subject to later-year rules and limits. Prior regular-method carryovers are not used in a simplified-method year. This tool shows current arithmetic over the limit but does not calculate prior or future carryovers.
How are part-year months counted?
For the simplified method, a month with fewer than 15 days of qualifying use counts as zero. For a constant area, this tool multiplies the capped area by qualifying months and divides by 12 before applying $5. Actual costs must already relate to the qualifying use period; they are not reduced by that month fraction again.
Can I deduct a W-2 employee office or a mixed-use room?
The ordinary model here requires regular, exclusive self-employed business use and a qualifying principal office. W-2 offices, personal/mixed use, shared areas and daycare/storage exceptions are outside this model and do not receive a supported deduction estimate. Review the applicable IRS rules for those circumstances.
Should I choose whichever method shows the bigger number?
The larger expense amount alone does not determine the best tax choice. Records, income limits, carryovers, homeowner depreciation and the rest of your return matter. Choose one method for the home/year under the applicable rules; do not add both card amounts together. The tool does not calculate tax savings or file an election.
What records should I prepare?
Bring area measurements, use dates, evidence of qualifying business use, business income/expense records and relevant housing bills. Prior returns and method history help identify carryovers and omitted rules. The free checklist and saved summary are preparation aids; checking a box does not verify deductibility.
Supported scope & official sources
Federal calendar-year planning for one self-employed business, one home and a constant-sized exclusive principal office. Supports 2025/2026 simplified amounts and current-period renter operating expenses only. Eligibility and income available are user-reported. Excludes homeowner actual expenses, depreciation, mortgage interest, property taxes, casualty losses, capital improvements, equipment, prior carryovers, changing/shared areas, multiple homes/businesses, daycare/storage exceptions and employee claims. No full tax, QBI, self-employment-tax or tax-savings calculation. Costs must relate to the qualifying actual-use period. The simplified monthly count is not reapplied to those entered costs. Amounts round to cents for planning; tax returns may use whole dollars.
For the renter actual estimate, the supported costs are operating expenses with no depreciation, casualty losses or prior carryovers. Current income limitation is applied to that limited scope. Homeowner costs are not modeled, and hidden rental inputs do not influence owner results. Areas are limited to 100,000 sq ft and each financial input to $1,000,000 for this tool; these are product limits, not IRS deduction limits.
Published by IntegraFin Tax & Accounting. Rules checked October 9, 2026. Publication 587 currently covers 2025; the selected 2026 year is planning under the supported ordinary rules, not a completed 2026 return. Review official changes and updated publications before adding years.