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Should I make partial pre-payments on an actuarial loan?
The contract is not very clear. As much as I can understand it will still help if you make part prepayments. In an Rule 78 or Actuarial method, the schedule is drawn up front and the break-up of interest and principal for each month is calculated ahead. At the beginning both the reducing balance method as well as Actuarial method will give the same schedule.  However in Actuarial method, if you make part prepayments, they get applied to the future principals, the interest are ignored. However the future interests are not reduced. Example: Say your schedule looks something like this; Monthly Payments say 100; Month | Principal | Interest 1 | 10 | 90 2 | 20 | 80 3 | 30 | 70 4 | 40 | 60 5 | 50 | 50 6 | 60 | 40 7 | 70 | 30 8 | 80 | 20 9 | 90 | 10 So lets say you have made 3 payments of 100, in the 4th month if you make 150 [in addition to 100], it would get applied to the principal of 4th, 5th and 6th month. So essentially you would save interest of 4th, 5th and 5th month. It would also reduce the total payments to 6. i.e. you will only have 7th, 8th, 9th due. The next payment you make of 100 will get applied to row 7. The disadvantage of this method over reducing balance is that the interest calculated for rows 7,8,9 don't change compared to reducing balance. However if you prepay in full, the unearned interest is calculated and returned as per the Actuarial Tables.