Frequently asked questions about the calculator.
At the same rate the total interest is lower for the differentiated schedule, but the first few payments are higher. Annuity is easier to budget around.
No. The calculator handles the pure loan math; any fees need to be added separately.
The early amount is applied to the principal. The schedule is then rebuilt — either with the same payment and a shorter term, or with a lower payment and the same term.
decimal.js provides 28 significant digits, far more than any practical loan needs. Rounding to the smallest unit happens when the schedule is built, just like a bank statement.