Debt snowball vs debt avalanche

Two strategies, one extra dollar

If you have multiple debts and a fixed amount of money to put toward repayments each month, the question is not whether to pay them off — it is the order in which you attack them. Both the snowball and the avalanche methods assume you make every minimum payment on time, then direct any spare cash at one specific debt until it is cleared.

Where they differ is which debt you attack first. That single decision changes how much interest you pay and, just as importantly, how it feels along the way.

The debt snowball — smallest balance first

The snowball method ranks your debts by balance, smallest to largest. You pay every minimum, then throw every extra dollar at the debt with the lowest balance. When that debt is cleared, you redirect its repayment to the next-smallest debt, and so on.

The first debt clears quickly because the balance was small. That early win builds momentum — the same fixed budget now flows into the next debt, accelerating its payoff. Each cleared debt amplifies the attack on the next.

Snowball is a behavioural strategy. The maths is not optimal, but the visible progress keeps people engaged with the plan long enough to finish it.

The debt avalanche — highest rate first

The avalanche method ranks debts by interest rate, highest first. You pay every minimum, then throw every extra dollar at the debt costing you the most in interest. Once it is cleared, you redirect to the next-highest-rate debt.

This minimises total interest paid. Mathematically, no other ordering of repayments will leave you with a smaller bill.

The catch is that the highest-rate debt is often a sizeable balance — a credit card or store card with thousands of dollars on it. The first cleared debt may be many months away, and there is no early-win signal to reinforce the plan.

What the maths actually says

The avalanche always wins on total interest. Across realistic debt mixes, the saving is typically a few hundred to a few thousand units of currency, and a few months knocked off the payoff date.

That sounds clear cut, but it ignores the most important variable in any debt payoff plan: whether you actually finish. A strategy that loses on paper but keeps you on track is the strategy that wins in practice. A mathematically optimal plan you abandon is worse than an imperfect plan you complete.

How to choose

Pick snowball if:

• You have struggled to stay on a previous payoff plan.
• Your highest-rate debts are large, and your smallest debts are small enough to clear within a few months.
• Visible early progress is important to your motivation.

Pick avalanche if:

• You are confident you will stick with the plan regardless of how slowly the first debt clears.
• The interest-rate gap between your debts is large — for example, one credit card sits well above all your other debts in rate.
• Minimising total cost matters more to you than how the plan feels.

A hybrid is also valid: clear one or two small debts first to free up cash flow, then switch to attacking the highest-rate debt. The exact strategy matters less than committing to one and finishing.

Run both before you commit

Both strategies use the same monthly budget. The difference is purely the ordering. Modelling each one against your actual debt list takes minutes and reveals exactly how much extra interest one approach will cost you — and how much sooner one approach will clear your first debt.

Next steps

Use our debt snowball calculator and debt avalanche calculator to model your debts under each strategy and see total interest, payoff date, and the order each debt is cleared.