I have a loan that I gave to a friend to buy a house that I use Quicken to manage. When I set up the loan (amount $480,000, term 30 years, rate 4.25%) Quicken's calculations matched mine for the amount of each payment. I know want to reduce the interest rate I am charging my friend and when I entered the changed rate in the Loan Details page Quicken calculates a different payment amount going forward then I calculate plus it somehow shows the last payment amount to be almost double the regular payment amount. I am trying to figure out what is going on.
For a little more information, the Opening Date of the loan was 9/30/2018. There have been 11 payments made to date each in the amount of $2,361.31. Quicken shows the current principal balance at this time to be $472,595.40. When I adjust the rate to 3.75% it calculates a new payment of $2,222.95 with the last payment on 9/30/2048 to be $4,213.30.
If I start a new loan in Quicken with an opening date of 8/31/2019 such that the first payment will be due on 9/30/2019 and put the interest rate at 3.75% and a term of 349 months (that's the remaining months from the current loan) it calculates (as do I) a monthly payment amount of $2,226.13 with a last payment on 9/30/2048 as $2,217.05.
I am trying to understand the difference and what additional thing Quicken is looking at when I just adjust the rate versus creating a new loan with what I believe to be the exact same numbers (current principal, remaining term, same interest rate). Any help will be greatly appreciated. This is really bugging me. :)