Getting out of debt, in the right order
Clearing debt is part maths, part psychology — and the order you tackle it in decides both how much interest you pay and whether you stick with it. This guide runs the four calculations that map your route out.
You owe £8,000 across three cards. Where do you start?
Avalanche
saves the most interest
Snowball
keeps you motivated
1 month
buffer comes first
Two debts at different rates, a fixed amount to pay each month — and the order you clear them in changes both the total interest and your odds of finishing. Avalanche targets the highest rate first to save money; snowball clears the smallest balance first for momentum. Each calculator below settles one piece — run them in order to build a plan you’ll actually follow.
The debt-free path, step by step
Four calculations in the order that gets you out fastest and keeps you there — choose a strategy, attack the costly debt, then guard against falling back.
Avalanche or snowball?
Avalanche pays the highest-interest debt first, minimising total interest — the mathematically cheapest route. Snowball clears the smallest balance first, giving quick wins that keep you going. Avalanche saves more; snowball is easier to stick with. Compare what each costs and how long each takes.
Avalanche vs Snowball Calculator →How fast can you clear the credit cards?
Credit cards usually carry the highest interest, so they’re where avalanche starts. Paying only the minimum can stretch a balance over decades and multiply the cost. See how raising the monthly payment, or moving to a 0% balance transfer, slashes both the time and the interest.
Credit Card Payoff Calculator →When will your loan be clear?
Personal and car loans have fixed terms and rates, but overpaying can still cut the total interest — subject to any early-repayment charge. Knowing your debt-free date, and what an extra £50 a month does to it, turns a vague burden into a finish line.
Loan Calculator →How big an emergency fund do you need?
Debt often returns because an unexpected bill goes straight back on a card. A small emergency fund — even £1,000 to start — breaks that cycle by absorbing surprises in cash. Build a starter buffer alongside repayment, then a fuller one once the costly debt is gone.
Emergency Fund Calculator →Why the order matters
Choosing the strategy comes first because it dictates the order of everything after — avalanche sends every spare pound at the highest rate, snowball at the smallest balance. Picking one consciously beats paying a little at everything, which is the slowest and most expensive approach of all.
The emergency fund comes last in the list but runs alongside the rest on purpose: a tiny starter buffer stops the next surprise bill undoing your progress, while the bulk of your money still attacks the costly debt. Clear the debt with no buffer and you’re one boiler breakdown from starting over.
Avalanche vs snowball at a glance
Both methods work; they optimise for different things. The right one is the one you’ll stick with to the end.
| Method | Best for |
|---|---|
| Avalanche (highest rate first) | Paying the least total interest |
| Snowball (smallest balance first) | Motivation and quick early wins |
| Either, consistently | Beating minimum-payment drift |
On the maths alone, avalanche almost always costs less. But a plan you abandon saves nothing, so if quick wins keep you going, snowball’s slightly higher cost can be worth it. Compare your exact debts both ways with the avalanche vs snowball calculator.
Ready to run your own numbers?
Begin by comparing avalanche and snowball — the choice that shapes your whole plan — then work down the path one calculator at a time.
A debt-free plan, worked through
One realistic example, run through the whole sequence, to show how the steps connect in practice.
- Strategy. Leah compares avalanche and snowball. Avalanche saves more interest; she picks it because the gap in motivation is small for her.
- Starter buffer. First she sets aside £1,000 so the next surprise bill doesn’t go back on a card and undo progress.
- Credit cards. Her 24% card is the priority — she throws the spare £350 at it, and a 0% balance transfer on the other stops interest while she clears it.
- The loan. The fixed-rate loan is lowest priority; she pays the minimum until the cards are gone, then redirects everything to it.
- Stay out. Once clear, she builds a fuller 3-month emergency fund so debt doesn’t creep back.
The takeaway: spreading £350 thinly across all three debts would have been the slowest, costliest route. Choosing avalanche first — and protecting it with a small buffer — gave every spare pound a clear target.
Five mistakes people make clearing debt
The errors that recur among people getting out of debt — and the ones that cost the most.
Paying a little at every debt at once
Spreading money evenly is the slowest and most expensive approach. Pick a strategy — avalanche or snowball — and throw spare money at one target while paying minimums on the rest.
Cost: years and interest added Fix: attack one debt at a timeClearing debt with zero buffer
Pay off a card with nothing in reserve and the next emergency just rebuilds it. A £1,000 starter buffer breaks the cycle while you attack the costly debt.
Cost: relapsing into debt Fix: keep a small buffer firstOnly paying the minimum on cards
Minimum payments are designed to keep you in debt for years. Even a modest increase, or a 0% balance transfer, dramatically cuts both the time and the total interest.
Cost: decades of interest Fix: pay more than the minimumOverpaying a loan without checking the ERC
Some loans charge an early repayment penalty. Overpaying usually saves interest, but check the charge first so the saving isn’t cancelled out.
Cost: a needless penalty Fix: check the ERC before overpayingClosing old accounts after clearing them
Clearing a card is great; closing your oldest account can shorten your credit history and nudge your score down. Lowering utilisation helps; reflexively closing accounts can hurt.
Cost: a dented credit score Fix: keep old accounts openDebt payoff questions, answered
Is avalanche or snowball better?
Should I pay off debt or save first?
How do I clear credit card debt fastest?
Does overpaying a loan save money?
How big should my emergency fund be?
Will paying off debt improve my credit score?
Other Calclens guides & tools
How this guide is built
The sequence reflects how debt advisers structure a payoff plan — choose a strategy, attack the most expensive debt, then protect against relapse with a buffer — balancing the cheapest route with the one people actually complete.
Every calculator linked here is a free Calclens tool with its own methodology and worked examples. The strategies and calculations use standard amortisation and interest maths; the individual calculator pages carry the detail.
Definitions and sources: methodology · sources.
Not financial advice. This guide is for general information and links to calculators that produce estimates. If you’re struggling with debt, free regulated help is available from organisations such as StepChange, National Debtline and Citizens Advice.