Putting a windfall toward debt

Resources · Paying off debt · 5 min read Building

Key points

• A windfall is any one-off money: a tax refund, bonus, gift, inheritance or sale.
• Putting it toward high-interest debt cuts the balance and every future interest charge.
• Keeping some as a cash buffer can stop new debt when something goes wrong.
• Deciding on a split before the money arrives makes it easier to follow through.

Why a windfall goes further than it looks

Interest is charged on the balance you owe. Lower the balance with a lump sum and every month’s interest charge after that is smaller. Keep your regular payment the same, and more of each payment goes to the balance. The debt finishes sooner.

So a windfall saves you more than its face value. It wipes out the interest that balance would have built up over all the remaining months.

A worked example

Say you owe $6,000 on a card at 22% a year and pay $200 a month. Then $1,500 lands in your account. The same maths works in any currency.

Assumptions: interest is charged monthly at 22% divided by 12, on the balance before that month’s payment. The $200 payment stays fixed. Nothing new goes on the card. In the windfall case, the $1,500 is paid before the first month’s interest. The last payment is whatever clears the balance.

The $1,500 clears the card 14 months sooner and saves $1,434.99 in interest. Those 14 months also free up $200 a month earlier than planned.

Questions to ask first

Before you send the whole amount to debt, stop and run through these.

Do you have any cash buffer?
If an unexpected bill turns up and you have no savings, it often goes straight back on a card. That’s why some people keep part of a windfall as a small emergency fund. Others put it all toward debt and build the buffer from their monthly budget afterwards. It depends on how exposed you feel to surprises.

Are any payments behind?
If you’re behind on essentials like housing, utilities or a debt, catching those up may matter more than getting ahead on one balance.

What interest rate are you paying?
The higher the rate, the more a lump sum saves. A windfall on a 24% card does more than the same amount on a low-rate loan.

Are there costs or rules on early payment?
Many credit cards let you pay extra any time. Some loans charge a fee for early repayment or limit how much extra you can pay. The rules vary by product and country, so check your loan terms.

Is there something you’d regret not doing?
Some people set aside a small share for something meaningful. Odd as it sounds, that can make the rest of the plan easier to stick with.

Ways to split a windfall

There’s no single correct split. Sending all of it to debt gives the biggest interest saving and the fastest finish. Topping up a small emergency fund first, then sending the rest to debt, trades a bit of that saving for a cushion. A fixed split (most to debt, some to savings, a little to enjoy) sits somewhere in between.

Then there’s clearing a small debt outright. If the windfall can wipe out one whole debt, its monthly payment is freed up for the next one. And that’s one less bill to manage.

Which debt to put it toward

With several debts, the same thinking as your monthly plan applies. Highest interest rate first usually saves the most interest. Smallest balance first can clear a debt completely and free up its payment sooner.

It’s also worth checking whether the windfall is big enough to clear a whole debt. If it is, some people find that a satisfying middle path.

Keep your regular payment the same

The saving in the example rests on one thing. You keep paying $200 a month after the lump sum goes in.

Drop your payment because the balance fell, and much of the benefit disappears. Card minimums often fall as the balance falls, so pick your payment amount yourself. Don’t follow the minimum down.

Plan before the money arrives

Windfalls have a habit of vanishing into everyday spending. Decide in advance what each dollar will do, and act on the day it lands. Leave it a few weeks and the decision tends to make itself.

Common questions

Should I put a windfall toward debt or savings?

That depends on whether you have a cash buffer and how high your debt rates are. Some people put it all toward debt. Others top up a small emergency fund first.

How much can a lump sum save on a credit card?

It depends on the balance, the rate and your payment. In the example above, $1,500 on a $6,000 card at 22% cleared it 14 months sooner and saved $1,434.99 in interest.

Should I lower my payment after a windfall?

Keeping the regular payment the same is what makes the saving work. If the payment drops with the balance, much of the benefit goes with it.

Try it

See how a lump sum changes your own payoff date with the credit card payoff calculator, or find your Freedom Date across all your debts.

General information only, not financial advice. Your situation is your own.