What it is:
How it works/Example:
Let's say John Doe borrows $100,000 to buy a house. The interest rate is 4% with a 30-year principal.
By building an amortization schedule, we can see that John have to make 231 mortgage payments (roughly 19 years) before half of his loan is paid off.
Why it matters:
The half-life of any debt. In John's case, each payment includes interest and . In the early years of his , his payments are largely interest. As time passes, however, more of his payment is principal . Accordingly, the half-life is not 50% of the time involved, but 50% of the principal involved. that John's interest rate and loan length influence the half-life tremendously.