THE GLOSSARY · DEBT
Amortisation
Your payment never changes. What is inside it does: on a twenty-five-year mortgage, it takes ten and a half years before principal overtakes interest.
By the Yoseri News desk · · 1 min read
Amortisation — the way a loan is repaid: the payment stays the same, but the share going to interest and the share going to principal slowly swap places.
Interest is always worked out on the remaining balance. High balance at the start, so high interest at the start, so little principal repaid — and the balance falls slowly. The mechanism feeds itself, against you.
On $350,000 at 4.79%, amortised over 25 years, the payment is $1,993.98 from the first day to the last:
| Payment | Interest | Principal |
|---|---|---|
| 1st | $1,383.34 | $610.64 |
| 61st — after 5 years | $1,220.28 | $773.70 |
| 126th — after 10 years 6 months | $994.15 | $999.82 |
| 300th — the last | $7.85 | $1,986.13 |
On the first payment, 69% goes to interest. You have to wait until the 126th — ten and a half years — for principal to take over. On the last, interest weighs only $7.85.
That is also why an extra payment is worth far more early than late: it goes straight at principal, and therefore at every dollar of interest that principal would have carried to the end.
Yoseri News is an educational publication. Nothing in this article is investment advice, a recommendation to buy or sell, or tax advice. Yoseri is registered as neither an adviser nor a dealer with any market authority.