Where is the interest tax shield??

CFA Level II
#1

According to schweser: FCFF=EBIT(1-tax shield)+depr.-FCInv-WCInv. But where is the tax shield that the interest cost creates? Shouldn’t I add something like interest * tax?

#2

FCFF = NetIncome + Int*(1-tax) +depr - FCinv - WCInv NetIncome = (EBIT-Int)*(1-tax) NetIncome +Int*(1-tax) = EBIT*(1-tax) tax shield and tax rate are identical