The short answer

A debt avalanche puts available extra money toward the eligible debt with the highest interest rate while maintaining required payments on the others. Verify each rate before ordering the list. Under comparable terms, reducing higher-rate principal first can lower interest cost, but promotional terms and payment restrictions need separate attention.

What makes this decision different?

Rank by rate rather than by the largest dollar interest charge on last month’s statement. A large low-rate balance can show more total interest than a small expensive balance, yet each additional dollar applied to the higher-rate debt generally avoids more interest over the same period. Check whether accounts contain multiple rate categories.

How can you apply the idea?

Use these steps to connect the strategy with your actual account terms and available money. Keep any unresolved assumptions clearly labeled.

  1. Confirm rates from current statements or creditor terms.
  2. Cover required payments and identify the highest eligible rate.
  3. Recheck the order when rates or promotional periods change.

What should the forecast not hide?

Do not present the result as a guaranteed saving for every loan. Prepayment terms, fees, rate changes, and new borrowing can alter the comparison. Use the actual account conditions when deciding whether a projection is suitable.

How can you stay engaged with a large target?

A high-rate target may also be a large balance that takes time to finish. Track intermediate principal milestones and actual interest charges so progress is visible before the account reaches zero. Keep those measures separate from total payments, since interest can absorb part of the money sent. Review the rate order when a new statement or promotion change arrives, not after every minor balance movement. If the payment budget becomes difficult to maintain, adjust affordability before abandoning the rate rule. The plan works as an allocation method only when the underlying payments remain realistic and are actually made.

Worked example · illustrative numbers

Illustrative example: compare the payment effect

Assume an extra $100 could reduce either an 18% or a 30% annual-rate balance. Using a simple annual-rate-divided-by-twelve illustration, the next month’s interest reduction is about $1.50 versus $2.50. The $1 difference illustrates marginal cost; actual daily-balance calculations and posting dates can change the exact amount.

Put this into practice with Debtless

Debtless is a completely free iPhone debt app with snowball, avalanche, and hybrid projections. Use its local ledger to compare plans with your own figures, then make and verify payments directly with your creditors.

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Common questions

Does avalanche require paying the biggest balance first?

No. The rule ranks eligible debts by interest rate. The highest-rate account might have the smallest, largest, or an intermediate balance.

How can you stay engaged with a large target?

A high-rate target may also be a large balance that takes time to finish. Track intermediate principal milestones and actual interest charges so progress is visible before the account reaches zero.

Sources & further reading

General education for U.S. readers, not individualized financial, legal or tax advice. Examples are hypothetical; lender terms and actual interest calculations can differ. Check your current statements and agreements.

Published by Debtless with AI-assisted drafting. How this journal is made · Suggest a correction