Browser-based planning tool · Reviewed August 3, 2026
Home Office Square Foot Calculator
Measure workspace allocation without determining whether regular-and-exclusive-use requirements are met.
Estimated result
Calculation summary
Planning estimate only. Calculations retain decimals; displayed money is rounded.
Understand your estimate
What these numbers mean
Use this result as a planning checkpoint, then verify the inputs and official rules that apply to you.
What these numbers mean
The result shows entered office area, area eligible under the cap, business-use percentage, simplified estimate, and excess-area warning.
How they were calculated
Eligible square feet are limited to the entered cap and multiplied by the entered rate; office area is divided by home area for context.
Common mistakes
Do not use nonexclusive space, enter room dimensions inconsistently, exceed total home area, or assume square footage alone proves eligibility.
Important assumptions
The simplified rate and cap are user entries, and office area is limited to the lesser of actual area and the entered limit.
Why an actual return may differ
Daycare, inventory storage, multiple businesses, income limits, actual-expense elections, and irregular spaces can alter the deduction.
How this calculator works
The calculator uses only the values shown in the form. User-entered percentages, limits, recovery periods, mileage rates, and eligibility assumptions are not treated as official defaults.
Hypothetical example
Hypothetical: A hypothetical consultant enters a 180-square-foot office within a 1,500-square-foot home and verifies the current simplified rate and limit. The example is not an actual taxpayer result or a promise of tax treatment.
Important limitations
This calculator does not prepare or file a return, determine legal eligibility, select accounting or depreciation methods, apply every annual limit, or calculate state-specific law. Verify current official instructions and individual facts.
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Frequently asked questions
Does this calculator file a tax return?
No. It provides an educational planning estimate only.
Are my entries stored?
No. Calculations run in the browser and entries are not stored or sent to a server.
Does the result guarantee tax treatment?
No. Eligibility, timing, classification, limits, and official rules depend on facts this calculator may not collect.
Sources and assumptions
Review the IRS Self-Employed Individuals Tax Center, applicable form instructions, and current plan or tax-year guidance. The site is not endorsed by the IRS.
Planning scope
Results and examples are planning estimates and hypothetical illustrations. 1099TaxCalcs.com does not prepare or file tax returns and does not replace IRS, SSA, state, or local instructions. Tax rules can change, state and local taxes or specialized rules may be excluded, and eligibility depends on individual facts. Verify current official sources and consider a qualified professional when the decision is material or complex.
Tax disclaimer
General education and planning estimates only—not individualized tax, legal, accounting, or financial advice.