Question on FCFF

Hey guys, I am reviewing Equity part now and have a question about FCFF.

When we calculate FCFF, why we add interest*(1-tax) but we add depreciation as a whole amount, not depreciation*(1-t). I know depreciation is a non cash charge but I feel like depreciation will also reduce the tax bill the company pays. Any thoughts?

This was covered in another thread in the last week. Search for it.