<prompt> Human: I recently got a mortgage and am now living in my first home hooray!. I sent in my first mortgage payment and saw that out of the 1250 I sent in, only about 300 went towards the principal. Now this makes me super curious. If I build up enough funds to send in two mortgage payments at once, then one of the payments would go towards 100 of the principal and it would be equal to something like 4 months of rent. So here is my question, If I were to do this right at the start of my mortgage, how much money could I potentially save just by doing this one single extra payment at the beginning?My mortgage is 1250 a month on a 230k loan with 3.25 interest. Would doing a double payment at the start of the mortgage have a huge impact? I want to know how much money would be saved once all the interest over the remaining life of the loan and everything is calculated out with that one single extra payment added in. Could something so small at the beginning have such a huge impact?  <response>: The single payment will save you 2040 in interest over a 30 year payment. 