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How do amortization schedules work and when are they used?
Both Credit Card and Mortgage work on same principle. The interest is calculated on the remaining balance.  As the balance reduces the interest reduces. The Mortgage schedule is calculated with the assumption that you would be paying a certain amount over a period of years. However if you pay more, then the balance becomes less, and hence the subsequent interest also reduces. This means you would pay the loan faster and also pay less then originaly forecasted. The other type of loan, typically personal loans / auto loans in older days worked on fixed schedule. This means that you need to pay principal + Pre Determined interest. This is then broken into equal monthly installment. However in such a schedule, even if you pay a lumpsum amount in between, the total amount you need to pay remains same. Only the tenor reduces.