09/09/2026
Most homebuyers focus on two numbers: the interest rate and the monthly payment. But there is a third number that paints the real picture of long-term borrowing costs—Relative Interest.
When you look at a standard 30-year mortgage, the gap between the annual interest rate and the total volume of interest paid over time is striking:
3.0% Rate: You pay over 51% of the loan balance in interest alone.
5.0% Rate: Total interest reaches 94%—almost doubling the original loan amount.
6.5% Rate: Total interest climbs to 128% of the principal ($128k+ paid in interest per $100k borrowed).
An interest rate is just 1 part of the equation. Amortization dictates the total financial impact over decades. Understanding this distinction is the key to building real housing equity and choosing a debt strategy that fits your long-term wealth plan—not just your monthly budget.