When calculating my current year additions and dispositions, should the base amount be the total cost of my asset or higher than my asset?

[brooklynnlundrig]

What is the difference between the base amount and cost in this section?

[TurboTaxSusan]

The cost is whatever was entered as the cost of an addition.

The base amount is what your CCA for the year will be based on in that class. It is the UCC amount after additions, dispositions and the current-year adjustments. It can be higher or lower or the same as the cost of your addition, depending on the circumstance.