🔥 Free Tool
Adjusted Basis Calculator
Your adjusted basis is the single most important number in your Eaton Fire tax situation — it determines whether you have a gain or a loss. Fill in what you know. The result tells you which lane you're likely in.
1. Original Purchase
2. Capital Improvements
Only include permanent improvements that added value or extended the life of the property — additions, remodels, new roof, pool, ADU, HVAC system, solar, etc. Repairs and maintenance do NOT count.
3. Other Basis Adjustments (optional)
Your Adjusted Basis Summary
Original purchase price—
Less: estimated land value—
Structure basis at purchase—
Total capital improvements—
Less: prior depreciation—
Less: prior casualty losses—
Estimated adjusted basis (structure)
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Insurance proceeds entered
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Insurance vs. basis
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Important limitations: This calculator uses simplified assumptions. Land value is your estimate. It does not account for inherited basis, gift basis, prior like-kind exchanges, community property adjustments, or other complex basis events. For a definitive basis calculation, a Tax X-Ray is required. This output is not tax advice — it is a planning estimate.
Adam Libman, CRTP — not a CPA, EA, or attorney. This tool is for planning purposes only.