Construction Cost Base

Hi All,

We have vacant block, we are in the process of constructing a investment property on the block. Appreciate if someone could answer following queries.

> How is the construction cost base for the property is calculated? From capital gains and ongoing tax deduction is the cost of investment property is land cost plus the amount borrowed from Bank to build the house ? If some of our savings is used during construction can be included in the base cost of the property ?
> Can the interest paid on the land mortgage before the house is built and rented out is a tax deductible claim ?

Regards