What Is the Debt Avalanche Method and How Does It Work?

Last two articles covered debt repayment strategy from the psychological angle.

Today's the math-first version; the debt avalanche method, and if you're someone who doesn't need a fake early win to stay disciplined, this is the one that actually saves you the most money, full stop.

Let's define it properly.

The debt avalanche method means you list every debt you owe by interest rate, from highest to lowest, completely ignoring the balance size, and you attack the debt with the highest interest rate first with every extra rand you can find, while paying only the minimum on everything else.

Once that highest-rate debt is cleared, you roll everything you were putting toward it onto whichever debt now has the highest remaining rate, and you keep going down the list.

Same rolling mechanism as the snowball, different sorting rule, rate instead of balance.

Let's make it concrete. Say you've got the same three debts we used last video and blog. A R3,000 store account at 22% interest. A R10,000 credit card at 24% interest. And a R30,000 personal loan at 18% interest. Under the avalanche method, you go straight for the credit card first, not because it's small, it's actually your second largest balance, but because at 24% it's the one bleeding you the most money for every rand still outstanding on it.

You pay minimums on the store account and the loan, and throw everything extra at that card until it's gone. Then you move to the store account, sitting at 22%, next highest rate remaining. Then finally the personal loan at 18%, by which point you've got serious combined payment power built up.

Here's the mechanism behind why this saves you real money, and it's simple once you see it laid out. Interest is calculated on your outstanding balance, continuously, for as long as that balance exists. The longer a high-interest debt sits there, the more it costs you, every single month, regardless of what else you're doing with your other debts.

By attacking the highest rate first, you're minimizing the total amount of interest that gets to accumulate across your entire debt load over the full repayment period. Every month you delay tackling your most expensive debt in favour of a smaller, cheaper one is a month that expensive debt kept compounding against you for no mathematical reason.

Let's actually quantify this, because vague claims about "saving money" don't land the way real numbers do. Across those same three debts, running the avalanche method instead of the snowball method, with the same extra monthly payment applied consistently, you'll typically finish paying off the total debt around the same time or slightly faster, but you'll pay meaningfully less in total interest over the life of the plan, often a few thousand rand less, sometimes more, depending on how wide the gap is between your highest and lowest interest rates.

The wider that gap, the more the avalanche method's advantage grows. If your rates are all bunched close together, the difference between the two methods shrinks to almost nothing, and which one you pick matters less.

So who does the avalanche method actually suit? This is the honest, important distinction, and I'm not going to pretend one method is universally correct. If you're someone who's genuinely motivated by the numbers themselves, seeing your total interest paid shrink, seeing your projected payoff date pull closer, and you don't need the emotional win of crossing a small account off your list to stay committed, the avalanche method is objectively the better choice for you specifically.

You'll pay less, and you'll likely finish just as fast or faster. If, on the other hand, you know from past experience that you lose motivation without visible progress early on, this method carries real risk because your highest-rate debt is very often also one of your larger balances, which means your first target under this plan can take a genuinely long time to clear, and that stretch with no visible "win" is exactly where people abandon well-designed plans.

Here's a specific danger worth naming directly.

If your highest interest rate debt also happens to be your largest balance which happens more often than people expect, because high-rate debt tends to be the kind people let run for longer before addressing it you could be looking at many months of payments before you see a single account fully cleared.

If you genuinely know you need that early emotional win to stay in the game, be honest with yourself about that before committing to this method, because starting the avalanche and abandoning it three months in, having made real progress you then walk away from, is worse than having picked the snowball from the start.

Let's walk through exactly how to set this up, step by step.

First. List every debt you owe, this time with the interest rate front and centre, not the balance. Store accounts, credit cards, personal loans get the actual rate on each one, not an estimate, check your statement or the agreement itself.

Second. Order that list from highest interest rate to lowest, regardless of balance size.

Third. Work out your real extra monthly amount beyond minimums, same as always — this needs to come from an actual working budget, not a guess.

Fourth. Pay minimums on everything except your highest-rate debt, and throw all your extra money at that one specifically.

Fifth. The moment that highest-rate debt is cleared, roll everything you were paying on it — minimum plus extra onto whichever debt now sits at the top of your remaining list by rate.

Sixth. Repeat all the way down, same rolling mechanism as the snowball, just working through the list in a different order.

One important technical point specific to South Africa worth knowing here, pay attention to whether a rate is quoted to you as an annual rate or a monthly rate, and whether it's the interest rate alone or includes additional fees and charges baked into what you're actually being charged.

Two accounts can look similar on paper with slightly different rate disclosures, and comparing them accurately means making sure you're comparing like for like, not a headline rate on one against an all-in cost on another.

And exactly the same as every method we've covered, keep every single minimum payment on every account current, without exception, throughout this entire process. The avalanche method is about where your extra money goes.

It's not permission to neglect anything else, and a missed minimum on a debt you're not currently focused on damages your credit exactly the same as it always would.

Here's the honest comparison to leave you with, snowball versus avalanche, in one sentence each. Snowball optimizes for finishing, fast early wins, built-in motivation, slightly more total interest paid.

Avalanche optimizes for cost, objectively less interest paid overall, but a harder emotional road if your highest-rate debt takes a while to clear. Neither is wrong. Pick based on honest self-knowledge, not on which one sounds more disciplined.

And one more time, because it matters every single time we talk about repayment strategy, whichever method you choose, it only affects debt you're actively paying down from today forward. It does nothing for anything already sitting on your credit report from before, old defaults, outdated judgments, accounts that should've aged off years ago.

That's a completely separate problem that a repayment plan, however well executed, will never touch on its own.

So here's your actual next step.

List every debt with its real interest rate, not balance.

Be honest with yourself about whether you're wired for the avalanche's discipline or the snowball's early wins. Build your extra payment number from a real budget, and set your minimums on autopilot so nothing slips while you're focused on the target debt.

And while your forward plan is getting built properly, pull your credit report and see exactly what's already sitting there from before, because if there's something inaccurate, outdated, or unfair on it, no repayment plan fixes that, only a proper dispute does.

That's exactly what we handle at Betafin, going through your report across TransUnion, Experian, Compuscan, and XDS until anything wrong is actually corrected. Book a free assessment with us — link's below, thirty minutes, no cost. Snowball builds momentum. Avalanche builds savings. Now you know which one is actually yours..

BOOK FREE CONSULTATION WORTH R1,200 HERE