| Amortization | Principle | Interest Rate | Payment Interval | # of Payments | Additional Payment | Total Payment | Total Interest |
1 | 30 | $76,800.00 | 3.85% | Monthly | 360 | $0 | $360.04 | $52,816.10 |
2 | 30 | $76,800.00 | 3.85% | Monthly | 146 | $300 | $660.04 | $19,499.28 |
3 | 30 | $76,800.00 | 3.85% | Monthly | 193 | $175 | $535.04 | $26,286.20 |
4 | 15 | $76,800.00 | 3.13% | Monthly | 180 | 0 | $535.00 | $19,491.07 |
There's several different options on how to approach this loan, between the 15 and 30 year amortization, with and without extra payments.
Option 1: I think we all understand that 30 years with no extra payments is the longest and most expensive way to pay. You end up paying $360/MO for 360 payments for a total interest payment of $52,800.
Option 2: Get a 30 year mortgage and add an additional $300 to your principle payment. This reduces your number of payments to only 146 (12 years) and only $19,500 in total interest.
Option 3: Get that same 30 year mortgage and make additional monthly payments of $175/MO. Compared to option 2, there are 193 payments over 16 years and $26,300 in total interest payments.
Option 4: The last option is to get a standard 15-year term with a lower interest rate. This is essentially the best of both options 2 and 3. You pay over 15 years (180 payments) (similar to option 3) and only pay $19,500 in interest (identical to option 2).
My $0.02:
In this situation, amortization over 30 years with extra principle payments of $300/MO is the best way to do it. You pay more per month ($660.04) and pay the same amount of interest as if amortized over 15 years, but you only make 146 payments, instead of 180, so you pay the loan off in just over 12 years. That means you have three additional years of finance-free income, compared to the 15-year loan.
Additionally, like has been mentioned already before, if something happens (toilet blows up, roof starts leaking, etc.) then you can forego that extra $300 payment and put it to use fixing the property. Once the crisis is gone, you can go back to making that additional payment towards the principle.
If you can't afford the full $300/MO extra, then consider doing the 15-year option. You pay $125 less per month but still pay the same in total interest.
Hope this helps, and good luck!
Austin