The full guide
Snowball vs avalanche — the fastest way out of debt for a Sri Lankan household
Reviewed and updated July 16, 2026 · Written for Sri Lankan investors and borrowers
A typical indebted Sri Lankan household is not carrying one loan but a mix: a credit card balance that never quite clears, a personal loan taken for a wedding or a medical bill, a vehicle lease, maybe an informal borrowing or a salary advance. Each has its own rate, minimum payment, and end date — and paying a little extra on all of them at once is the slowest possible way out.
The two proven strategies are the avalanche (attack the highest interest rate first) and the snowball (attack the smallest balance first). This guide shows how each works with rupee examples, which one saves more money, which one people actually stick to, and how the calculator above lets you compare both against your real debts.
First, list every debt honestly
Write down every balance, its interest rate, and its minimum monthly payment — including informal debts and salary advances, which have real costs even when no rate is printed anywhere. A representative example: a Rs. 350,000 credit card balance (in Sri Lanka, cards carry among the highest rates of any consumer credit), a Rs. 900,000 personal loan, and a Rs. 2,400,000 outstanding vehicle lease. Your CRIB report is a useful cross-check that nothing formal is forgotten.
Then find your attack amount: the money you can pay each month beyond the sum of all minimums. Even Rs. 10,000–20,000 a month of extra payment changes the timeline dramatically, because every extra rupee goes straight to principal.
The avalanche: cheapest in total interest
The avalanche directs every extra rupee at the debt with the highest interest rate while paying minimums on the rest. In the example above, that means the credit card first — card interest compounds monthly and dwarfs the other rates — then, once the card is cleared, its entire payment rolls onto the personal loan, and finally onto the lease. Mathematically the avalanche always minimizes total interest paid, because expensive rupees of debt are extinguished before cheap ones.
The snowball: built for motivation
The snowball orders debts by balance, smallest first, ignoring rates. In our example the order happens to match the avalanche — the card is both the smallest and the most expensive, which is common in Sri Lanka since cards are usually the priciest and smallest debt. But if you had, say, a Rs. 150,000 zero-interest staff loan and a Rs. 350,000 card, the snowball would clear the staff loan first and cost you extra interest.
Why choose it anyway? Behaviour. Clearing an entire debt within a few months is a visible win that keeps people going, and each cleared debt frees a minimum payment that snowballs onto the next. Research on debt repayment consistently finds that people who see early wins are more likely to finish.
Which should you choose?
If the rate gap between your debts is large — a credit card versus a concessionary housing loan — the avalanche’s savings are too big to ignore. If your debts carry similar rates, or you have struggled to stay consistent before, the snowball’s momentum is worth more than the modest extra interest.
| Factor | Avalanche | Snowball |
|---|---|---|
| Ordering rule | Highest interest rate first | Smallest balance first |
| Total interest paid | Lowest possible | Usually somewhat higher |
| First visible win | Can take long if the priciest debt is large | Fast — small debt cleared early |
| Best for | Disciplined payers, big rate gaps | Motivation-driven payers, similar rates |
Accelerators specific to Sri Lanka
Ask your bank about converting a revolving card balance into a fixed instalment plan or a lower-rate personal loan — replacing your most expensive debt with a cheaper one is an instant avalanche win, provided you stop re-spending on the card. Check whether early settlement of a lease or loan carries a penalty and whether the rebate on unearned interest makes settlement worthwhile.
Direct windfalls — bonuses, harvest income, money from abroad — at the target debt rather than spreading them thin. And once the last debt clears, redirect the entire payment amount into savings: the same behaviour that got you out of debt builds your emergency fund at speed. Every facility you settle also cleans up your CRIB record for the next time you genuinely need credit.
Before month one, collect a current settlement figure and payment instructions from every lender; a statement balance may exclude accrued interest or an early-settlement charge. Schedule all minimums automatically, then send the extra amount to one named target and retain each receipt. Update the planner whenever a rate, minimum, or balance changes. This simple monthly reconciliation prevents an underpaid non-target debt from going into arrears while you concentrate on the winner.
Sources & further reading
This guide is educational and reflects publicly available rules and market conventions at the review date. Tax rates, bank rates, and regulations change — verify current figures with the institution or the Inland Revenue Department before making a financial decision. Nothing here is financial, tax, or investment advice.