# YTM of a Fixed-Income Loan?

I'm quite confused regarding the computation of a YTM.

I got a Portfolio of Single Loans 30Y(like a MBS) which are not traded and hence do not have a market price. Now I want to compute the YTM in the usual manner but as far as I know in order to do so I need a (market) price, which does not exist in my case. The only price I could get is the Present Value of the Mortgage?

Thanks,

KS