Two orders, one pot of money
When there are several debts running at once, every repayment plan has the same shape. The minimum on each one goes out, and whatever is left over is thrown at exactly one of them. When that one is cleared, its minimum joins the pot and the whole amount moves to the next debt. Nothing else changes.
The only decision is which debt gets the extra money first. Two orders have names. The avalanche pays the highest interest rate first, regardless of size. The snowball pays the smallest balance first, regardless of rate.
The avalanche is the cheaper order in every case, because interest is charged on balances and the fastest way to reduce interest is to shrink the balance that is charging the most. That is arithmetic; it is not in dispute. What is worth examining is how much cheaper, and what the other order buys instead.
The same money, run both ways
Take three hypothetical debts. A consumer-durable loan of ₹18,000 at 14% a year with a ₹1,500 monthly minimum. A credit card carrying ₹40,000 that revolves at 3.5% a month, which is 42% a year, with a ₹2,000 minimum. A personal loan of ₹1,20,000 at 16% a year with a ₹3,500 minimum.
The minimums come to ₹7,000. Suppose ₹12,000 a month is what can be found for debt, so there is ₹5,000 of surplus to point at one debt at a time. Note that the smallest balance here is not the most expensive one — that is the case where the two orders genuinely disagree.
Everything else is held identical: the same ₹12,000 every month, no new borrowing, no missed payments.
| Same ₹12,000 a month | Highest rate first | Smallest balance first |
|---|---|---|
| First debt cleared | Month 7 — the ₹40,000 card | Month 3 — the ₹18,000 loan |
| Second debt cleared | Month 14 | Month 8 |
| All three cleared | Month 17 | Month 18 |
| Interest paid in total | About ₹25,500 | About ₹27,500 |
Where the difference actually lives
One month and roughly ₹2,000, on ₹1,78,000 of debt cleared over a year and a half. That is the whole prize for getting the order mathematically right in this example.
The other column is not nothing either. In the snowball run, one debt is gone in month three. In the avalanche run, the first thing to disappear takes until month seven. Eleven months separate the two moments where a person sees an account close and a minimum payment vanish from their bank statement.
That matters because the real failure mode of debt repayment is not choosing the wrong order. It is stopping in month five. A plan abandoned halfway costs far more than the ₹2,000 gap between the two orders, and the thing that most reliably sustains the effort is visible evidence that it is working.
So the honest framing is not which method is better. It is: is the problem here the rate, or the momentum? Someone who has been paying steadily for a year and just wants the cheapest route has an arithmetic problem, and the avalanche answers it. Someone who has started and stopped three times has a different problem, and the ₹2,000 is a reasonable price for an early finish.
When the gap stops being small
The ₹2,000 above is small because the rates in the example are not that far apart: 14%, 16% and 42%. Widen that spread and the avalanche's advantage grows quickly. A card revolving at over 40% a year sitting alongside a home loan in the single digits is a case where the order is worth several months of repayment, not a rounding error.
Narrow the spread and the reverse happens. Three loans between 12% and 16% make the order almost irrelevant, and the choice can be made purely on which one is easiest to keep up with.
The other thing that widens the gap is a revolving balance. A closed-end loan has a fixed schedule and a shrinking balance. A card balance can grow while it is being repaid, because the card is still being used. In that case the order matters far less than whether the card is still in circulation at all.
What both orders quietly assume
That the pot is steady. Both methods depend on the same amount going out every month. Neither survives a plan that assumes ₹12,000 in a month where ₹12,000 does not exist, which is why the number is better set from what has actually been spendable for the last three months than from an intention.
That the minimums keep being paid. Directing the surplus at one debt does not suspend the others. A payment missed on a debt that was being ignored shows up in credit information reporting and stays there, and no ordering strategy compensates for that.
That nothing new is added. Adding a fresh purchase in instalments to a repayment plan resets the finishing line, and it does so quietly, because the new instalment looks small next to the balances being cleared.
One more thing sits outside both methods: the rate itself is sometimes negotiable. A balance moved from a card to a lower-rate loan, or a lender approached about restructuring, changes the arithmetic more than any reordering can. That is a separate decision with its own costs — a transfer fee, a longer term, a new EMI on the record — and it is worth pricing rather than assuming.