ko. Amortization Schedule. On January 1, 2015 you take out a 30-year mortgage for $100,000 with no down payment and 5% interest. Your monthly payment amount is $537. Fill in the following amortization schedule for the first four months of payments. Show your work down below Interest Portion of Principal Portion of Monthly Payment Beginning Balance Monthly Payment Monthly Payment Ending Balance Jan-15 Feb-15 Mar-15 Apr-15