apply neg tax on tax deductible charity and leave alone mortgage payment?

CFA Level III Portfolio Management
#1

I am trying to calculate investment base for private ips:

Tax deductible 250k

mortgage payment 200k

the after tax amount left in the portfolio?

i got 250k + 200/(1-.22) = -456.41k

but shweser says 250(1-.22) + 200 = -395k

can somebody help me with this confusion please?

#2

Mortgage payment is pre-tax. hence the after-tax payment is 250*(1-0.22) assuming 22% is the tax rate

#3

thx - let me get this - since investment portfolio is already tax paid, the mortgage payment is not affected. Ok

re charity, the cash leaving the portfolio is 250 but .22x is deducted and stays in the portfolio?