Snowball vs. Avalanche: Two Ways to Clear Debt Faster

When you owe money on several accounts, the order you pay them off in changes both the cost and how the journey feels. Two well-known methods take opposite approaches.

Plantrino Guides · Updated 2026 · About a 9-minute read

Carrying several debts at once — a card here, a personal loan there — can feel like fighting on too many fronts. The good news is that a clear strategy makes a real difference. Two popular methods, the debt snowball and the debt avalanche, both work; they simply optimise for different things. This guide explains both, runs the actual numbers on a realistic set of debts, and shows you which decision in the whole process matters most.

The Shared Foundation

Both methods rest on the same setup, and it is worth being clear about it first:

• You make the minimum payment on every debt, every month, without fail. This keeps all accounts in good standing.
• You then take any extra money you can spare and throw all of it at one chosen debt.
• When that debt is gone, the money you were putting toward it rolls onto the next target.

That last point is where the word "snowball" comes from, and it applies to both methods. Your total monthly outlay never drops as debts disappear — it stays fixed, and each freed-up minimum payment gets added to the attack on the next debt. The payment aimed at your final debt is usually several times larger than what you started with, which is why the last stretch goes so much faster than the first.

The methods differ only in one decision: which debt you attack first.

The Debt Avalanche: Cheapest Path

The avalanche method targets the debt with the highest interest rate first, regardless of its balance. Once that is cleared, you move to the next-highest rate, and so on.

Because interest rate is what determines how fast a debt grows, killing the most expensive debt first means less of your money is lost to interest overall. Mathematically, the avalanche is the cheapest route and usually the fastest to total freedom.

Note that balance is irrelevant to this method. A $500 balance at 22% is costing you more per dollar than a $20,000 balance at 6%, and the avalanche says to hit the small expensive one first. That can feel counterintuitive when the big number is the one keeping you awake.

The Debt Snowball: Most Motivating Path

The snowball method targets the debt with the smallest balance first, regardless of its interest rate. You clear the little debts quickly, then roll their freed-up payments onto larger ones.

Its strength is psychological. Eliminating a whole debt — seeing an account hit zero and closing it — is a genuine, visible win. Those early victories build momentum and belief, and for many people, staying motivated is the real challenge of paying off debt. There is also a practical side effect: fewer accounts means fewer due dates, fewer statements, and less chance of missing a payment.

A Side-by-Side Example

Imagine three debts and $200 of spare money each month above the minimums:

The avalanche attacks the store card first — it happens to be both small and the most expensive, so here the methods start the same. But it then targets the personal loan (11%) before the car loan (7%), cutting the most costly interest next.

The snowball also clears the store card first because it is smallest, then moves to the personal loan, then the car loan — by ascending balance. In this example the two paths happen to line up, so the choice makes no difference at all. That is more common than people expect: small debts are often expensive debts, because store cards and credit cards carry the highest rates and the lowest balances.

Putting Real Numbers on It

To see a genuine difference you need a case where the smallest debt is not the most expensive. Take Josh, who owes:

That is $9,400 of debt and $235 a month in minimums. Josh finds $250 a month spare, so his total budget is $485 and he keeps it fixed until everything is gone. The two methods now disagree about where to start — Card B is the smallest, but Card A is the dearest.

Running both plans month by month gives this:

The avalanche saves $116 and finishes one month sooner. The snowball hands Josh a cleared account five months earlier. These figures are purely for illustration — your own rates, minimums and balances will give different results — but the shape of the answer is typical. The avalanche wins, and it wins by less than most people imagine.

That is a useful thing to know before you agonise over the choice. On a $9,400 debt load, picking the "wrong" method costs about the price of a tank of fuel a year. Giving up on either method costs far more.

The Decision That Actually Matters

Keep Josh's three debts exactly as they are, keep the avalanche order, and change only one thing — how much spare money he finds each month:

Paying minimums only stretches this out to nearly five years and costs $3,818 in interest. The first $100 of extra payment cuts 22 months and $1,823 off that — roughly sixteen times the benefit of choosing the mathematically optimal order. Again, illustrative arithmetic rather than a quote, but the ranking is what counts.

So if you are stuck deciding between snowball and avalanche, the honest answer is: flip a coin, start today, and spend your energy on finding the extra payment instead. An hour spent cancelling a subscription you forgot about will beat an hour spent optimising the order.

Where Australian Debts Fit

Not everything you owe belongs in the same queue, and a few Australian debts need separate treatment.

Credit cards and store cards are the usual top of the avalanche list, and their rates are typically far above anything else you carry. If you are unsure how much yours is really costing you, our guide to credit card interest walks through the daily calculation.

Buy now, pay later balances often charge no interest, which makes them look harmless in an avalanche ranking. Their risk is late fees and the sheer ease of adding more, so many people clear them early simply to close the tap — a snowball-style decision made for a practical reason rather than a mathematical one.

Study debts (HECS-HELP and similar) work differently from consumer debt. They do not charge interest in the ordinary sense; instead the balance is indexed periodically, and repayments are compulsory once your income passes a threshold and are collected through the tax system. Both the indexation figure and the repayment thresholds change from year to year, so check current ATO guidance rather than assuming last year's numbers — and be aware that voluntary extra repayments toward a study debt are a genuinely different decision from paying down a credit card.

Your mortgage sits at the other end. It is usually the largest balance and the lowest rate, so both methods put it last. If your loan has an offset account or redraw facility, extra money parked there reduces the interest charged while staying accessible — but features and conditions vary between lenders, so check how your own loan works before relying on it. Our guide to loan repayments covers the mechanics.

Debts owed to family or to the tax office do not fit either ranking neatly. Relationship debts and any arrangement with a deadline attached generally get priority regardless of what a spreadsheet says.

How to Choose Your Method

• Choose the avalanche if you are motivated by efficiency, want to pay the least interest, and can stay disciplined without frequent wins.
• Choose the snowball if past attempts have fizzled out, or if seeing quick, visible progress is what keeps you going.
• Consider a blend. Some people clear one tiny debt first for the morale boost, then switch to the avalanche for the rest. As Josh's numbers show, the cost of that compromise is small.
• Check whether it matters at all. Write your debts out twice — once by rate, once by balance. If the two lists are in the same order, the debate is moot and you can start immediately.

Habits That Make Either Method Work

• Find the extra payment. Even a small fixed amount above the minimums dramatically shortens the timeline, as the table above shows.
• Hold the total steady. When a debt clears, resist letting the freed-up payment quietly rejoin your spending. Redirect it the same week.
• Avoid adding new debt. Paying down one card while running up another cancels the progress.
• Keep a small buffer. An emergency fund stops a surprise expense from sending you back to borrowing mid-plan.
• Track it visibly. A chart or list you update each month turns a vague goal into concrete momentum.
• Automate the minimums. Direct debits for every minimum payment protect you from a missed-payment fee that would undo a month of extra effort.

Common Mistakes

• Spreading the extra money across every debt. Adding $80 to each of three debts feels productive but clears nothing. The whole power of both methods comes from concentrating the extra on one target at a time.
• Letting the freed-up payment disappear. If clearing Card B just means $25 a month more spending money, the snowball never rolls. This is the single most common reason a payoff plan slows to a crawl.
• Attacking debt with no buffer at all. Throwing every spare dollar at the balance and then meeting a car repair with the same card is a loop that goes nowhere. A small starter buffer first is usually the faster route overall.
• Ranking by the size of the monthly payment. A big repayment does not mean an expensive debt. Rank by interest rate or by balance — not by what hurts most each month.
• Treating a balance transfer as progress. Moving a balance changes where the debt sits, not how much you owe. It only helps if you keep paying at the same rate through the promotional window and stop using the old card. Transfer fees and revert rates vary, so read the terms.
• Waiting for a better month to start. The tables above are driven by time. Starting with $50 now generally beats starting with $250 in six months.

Frequently Asked Questions

There is no single right answer between the snowball and the avalanche — only the right answer for you. The avalanche is the mathematician's choice; the snowball is the motivator's. But the numbers make one thing clear: the order you choose is a minor decision, and the amount you find each month is the major one. Pick the method you can stick with, find a steady extra payment, and let the freed-up money roll from one debt to the next until they are all gone.