The Debt Avalanche Method Explained: Interest Minimization Math
Understand the mathematical interest minimization mechanics behind the Debt Avalanche strategy.
The Debt Avalanche method is designed to minimize the total interest paid across all debt accounts by prioritizing high Annual Percentage Rates (APRs).
How the Avalanche Method Works Mathematically
- Rank Accounts by APR: Sort debts from highest APR to lowest APR.
- Maintain Minimums: Pay minimum required amounts on all non-target accounts.
- Attack Highest APR: Direct all extra monthly repayment funds to the highest APR account.
- Cascade Saved Interest: Once the highest APR account reaches zero, cascade its payment allocation to the account with the next highest APR.
Why the Avalanche Method Saves the Most Money
Interest charges accrue as a percentage of your remaining principal balance:
$$\text{Monthly Interest Charge} = \text{Principal Balance} \times \left(\frac{\text{APR}}{12}\right)$$
By eliminating the highest APR accounts first, you shrink the rate at which interest generates across your total debt portfolio.
Test Your Interest Savings
Compare how much interest you save under the avalanche method using our free Debt Avalanche Calculator.
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