US Home Office Deduction Calculator — Simplified vs Actual Expense
Estimate your potential federal home office deduction under the IRS simplified method and a basic actual-expense pro rata method. Includes methodology, eligibility guidance, citations, and example scenarios.
- Page updated:
- Jan 3, 2026
- Tool version:
- v1.1.0
Overview
This calculator provides an estimate of a federal home office deduction using the IRS simplified method and a basic pro rata actual-expense estimate. It is intended for planning and informational purposes only — it does not replace professional tax advice or a full tax preparation process.
Core inputs
Results
Simplified method deduction
$750.00
Actual-expense method deduction
$1,200.00
Recommended method
Actual-expense method likely yields a higher deduction (verify with detailed expenses and depreciation).
Eligibility notes
Home must be used regularly and exclusively for business (or as principal place of business) per IRS guidance. Simplified method: flat rate per sq ft, capped at the maximum eligible sq ft, no depreciation. Actual-expense method: allocate actual qualifying expenses by business-use percentage.
How to read the result
- What it means
- The displayed value is an estimate based on your inputs. It represents the calculated scenario under current assumptions, not a guaranteed amount.
- Calculation limits
- The model uses simplified formulas and cannot account for all variables in your specific case (local regulations, personal conditions, temporal changes).
- Next step
- Use the result as a starting point. Adjust parameters to compare scenarios and validate with a professional when needed.
Glossary+−
- Simplified method
IRS option that multiplies eligible square footage (up to a cap) by a prescribed rate. Reduces recordkeeping; no depreciation is allowed.
- Actual-expense method
Allocates qualifying home expenses to business use based on the percentage of the home used for business. May include depreciation and requires detailed records.
- Exclusive use
Use of a specific area of the home only for business; required for many home office deductions.
Key takeaways
This tool estimates the federal home office deduction using two approaches: simplified and a basic actual-expense pro rata estimate. It is for planning only — verify results with documented expenses and, if needed, a tax professional.
Key citation: IRS Publication 587 (Business Use of Your Home).
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Useful links
Worked examples
Example 1 — Simplified method
User has a 150 sq ft dedicated office, simplified rate $5/sq ft, cap 300 sq ft.
Interpretation
Simplified deduction = 150 sq ft * $5 = $750. No depreciation is claimed under the simplified method.
Example 2 — Basic actual-expense pro rata estimate
User has 150 sq ft office in 1500 sq ft home, qualifying annual home expenses $12,000.
Interpretation
Allocation ratio = 150 / 1500 = 10%. Estimated actual-expense deduction = 10% * $12,000 = $1,200. Real actual-expense claims may differ after depreciation and specific expense allocations are applied.
Frequently asked questions
Which method should I choose?
Compare the simplified and actual estimates. Simplified reduces recordkeeping but often yields a lower deduction for high actual home expenses or when depreciation is favorable. Use the method that yields the greater tax benefit while meeting IRS eligibility and recordkeeping rules. Consult a tax professional for cases involving depreciation or property sale concerns.
What makes a workspace eligible?
The IRS requires the space to be used regularly and exclusively for business, or as a principal place of business. Partial, occasional, or multi-use rooms often do not qualify. See IRS Publication 587 for full eligibility rules.
Does the simplified method affect future tax calculations (like capital gains)?
Under simplified method you do not claim depreciation; however, claiming depreciation under the actual-expense method can affect basis and potentially capital gains on sale. Discuss implications with a tax advisor.
Sources & references
- IRS Publication 587 — Business Use of Your Home: https://www.irs.gov/publications/p587
- IRS — Home Office Deduction (simplified option): https://www.irs.gov/newsroom/standard-mileage-rates-and-home-office-deduction-guidance
- IRS Forms & Instructions: https://www.irs.gov/forms-instructions
Quality & oversight
- Author
- Ugo Candido, MBA
- Maintained by
- Ugo Candido, MBA
- Page updated
- Jan 3, 2026
- Tool version
- v1.1.0