Definition
Adjusted basis is your property’s cost basis after adjustments over time. It generally starts with what you paid to acquire the property (plus certain acquisition costs), then increases for capital improvements, and decreases for items like depreciation. Adjusted basis is used to determine your taxable gain or loss when you sell or dispose of the property.
How It’s Calculated
At a high level, adjusted basis is “what you have in the deal†for tax purposes after accounting for improvements and depreciation.
Common formula
- Adjusted Basis = Original cost basis + Capital improvements + Certain acquisition costs − Depreciation (and other basis reductions)
What Typically Increases Basis
- Purchase-related costs: certain closing costs that are required to acquire the asset (not operating costs).
- Capital improvements: renovations that add value, extend useful life, or adapt the property to a new use.
- Major replacements: roof, HVAC, windows, structural repairs, major building systems.
What Typically Decreases Basis
- Depreciation: the cumulative depreciation you’ve taken (or were allowed to take).
- Insurance or casualty reimbursements: if they reduce your net investment in the asset.
- Credits and certain allowances: depending on tax treatment, some items can reduce basis.
Why It Matters
Adjusted basis directly affects your taxable gain. A higher adjusted basis generally means a lower taxable gain on sale. Depreciation lowers basis over time, which can increase gain at sale and create potential depreciation recapture.
Investor Uses
- Disposition planning: estimate taxable gain before selling and model after-tax proceeds.
- 1031 strategy: understand how deferred gains carry forward into replacement property basis.
- Recordkeeping: track CapEx and improvements that support basis and reduce future tax liability.
- Cost segregation: evaluate how accelerated depreciation impacts basis and recapture.
Example
You buy a rental property for $1,000,000. Over time, you complete $150,000 in qualifying capital improvements. You have claimed $220,000 in cumulative depreciation.
- Adjusted Basis = 1,000,000 + 150,000 − 220,000 = $930,000
If you later sell the property for $1,250,000 (ignoring selling costs for simplicity), your estimated gain is:
- Estimated Gain = 1,250,000 − 930,000 = $320,000
Common Pitfalls
- Confusing repairs with improvements: routine repairs are typically expensed, while capital improvements add to basis.
- Missing documentation: unsupported CapEx can be disallowed, lowering basis and increasing taxable gain.
- Ignoring “allowed or allowable†depreciation: basis may be reduced even if you failed to claim depreciation you were entitled to.
- Forgetting selling costs: commissions and closing costs can reduce taxable proceeds; model both basis and disposition costs.
Related Terms
Note: Tax rules are complex and fact-specific. This glossary entry is for education only and is not tax advice. Consult a qualified tax professional for your situation.