Computing a property's adjusted basis is not limited to decreases due to depreciation, amortization, and depletion. A property's basis may also have to be increased or decreased by certain items depending on the type of property and its history. Below is a list of possible increases and decreases that affect a property's basis, per IRS Publication 551:

Increases to Basis

• The cost of extending utility service lines to the property.
• Impact fees.
• Legal fees, such as the cost of defending and perfecting title.
• Legal fees for obtaining a decrease in an assessment levied against property to pay for local improvements.
• Zoning costs.
• The capitalized value of a redeemable ground rent.

Decreases to Basis

• Section 179 deduction.
• Nontaxable corporate distributions.
• Deductions previously allowed (or allowable) for amortization, depreciation, and depletion.
• Exclusion of subsidies for energy conservation measures.
• Vehicle credits.
• Residential energy credits.
• Postponed gain from sale of home.
• Investment credit (part or all) taken.
• Casualty and theft losses and insurance reimbursements.
• Certain canceled debt excluded from income.
• Rebates from a manufacturer or seller.
• Easements.
• Gas-guzzler tax.
• Adoption tax benefits.
• Credit for employer-provided child care.