The value of the taxpayer's investment in a property.

In an exchange, the deferral of the tax on the gain is accomplished by requiring the taxpayer to carry over (substitute) the basis of the relinquished property into the replacement property, with appropriate adjustments for any additional consideration is paid. (See Deferral)

The day on which the taxpayer transfers or causes to be transferred the relinquished property to the relinquished property buyer.

A one-time “bonus” depreciation allowance claimed against the starting Tax Basis of qualifying property. Eligible to be claimed in the year the eligible property is placed in service, the allowance is an additional deduction computed after any Section 179 expense (if applicable) and before any MACRS depreciation deductions are calculated.

Unlike property or non-qualifying property such as securities, cash, notes, partnership interests, etc. Taxpayer who receives boot ("unlike" property) will have to recognize gain to the extent of the net boot received or realized gain, whichever is less. In exchanges, there are two types of boot: cash boot and mortgage boot.

This refers to a type of exchange done where some of the proceeds of the sale of the relinquished property will be used to cause improvements to be placed on the land constituting the replacement property so that the taxpayer can complete the trade where both the value of the land and of the improvements will count for the amount the taxpayer traded for. These types of exchanges are structured pursuant to IRS Rev. Proc. 2000-37 and are sometimes known as “property parking exchanges” and are sometimes known as “property parking exchanges” and require the exchange facilitator to take on an additional role as a Qualified Exchange Accommodation Titleholder.

The purchaser of the taxpayer's relinquished property.