Do you spend more with a credit card? Yes, and you remember it less

Nobody thinks a card makes a purchase cheaper. The research says it makes it feel cheaper, at the moment of paying and in the memory afterwards, which is the moment the next purchase is decided. Where most spending goes on cards, and many charges are split into instalments, that gap is where the savings you planned in January quietly go.

Do people really spend more with a credit card?

Prelec and Simester ran a sealed-bid auction for tickets to a sold-out basketball game. Half the participants were told the winner would pay by cash, half by credit card. The card group bid roughly twice as much for the same seats, and the effect held for a second set of prizes. The tickets did not change; only the instrument did.

The size of the effect is what makes it worth taking seriously. A few percent could be noise or a quirk of the sample. Twice the price, for the same good, from people who knew they would really have to pay, is a change in how the money felt.

Why card payments are remembered less accurately

Soman went a step further and asked whether card payments are even recorded properly in memory. They are not: in his studies, people who had paid by card recalled their past spending less accurately than people who had paid by cheque or cash, and the card payers were more willing to spend again afterwards. A cash payment is rehearsed: you count it out. A card payment is a tap, and the amount is not part of the gesture.

This is the half of the research that matters for a budget. Overpaying once is a bad purchase. Under-remembering every purchase is a wrong picture of the month, and the next decision is made against that picture.

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How much of our spending is on cards now?

Nearly all of it, by value. The Federal Reserve Bank of Atlanta's 2025 Survey and Diary of Consumer Payment Choice found that credit cards were used for 39% of purchases by number and debit cards for 34%, with cash at 16%, down from 17% the year before. By dollar value, 67% of purchases went on cards.

So the experiments describe the default, not the exception. Two thirds of what a household spends is paid with the instrument that is bid up and remembered down.

What instalments do to the mental month

Instalments compound it. A $1,200 purchase in six payments of $200 is remembered, if at all, as $200, and the five charges still to come belong to nobody's mental month. Each of them lands later as a charge with no purchase attached, which is the same shape as a forgotten subscription: money leaving without a decision being made.

The honest way to count an instalment plan is once, at full price, on the day the purchase was made, and then to show the schedule of payments separately as a cash-timing view. Counting the $200 each month in a spending category instead means the purchase is never seen whole, and a budget full of never-seen-whole purchases is a budget that is wrong in a direction that always favours spending.

Does knowing about the effect make it go away?

Not on its own. Knowing that a tap feels cheaper does not restore the rehearsal of counting notes out, any more than knowing an optical illusion is an illusion makes the lines look equal.

What changes the behaviour is a different input, not a different attitude: the running total, per card, visible before the next purchase rather than after the statement. Once the number is in front of you, the question at the till stops being “does this feel expensive” and becomes “where does this leave the month”, which the card cannot distort.

How to stop card spending leaking your savings

The pain of paying cannot be restored, and nobody wants to carry cash. What can be restored is the number.

1. Move the savings transfer first, on payday, to an account the cards do not reach. The card then spends what is left, not what was meant to be saved.
2. Post every charge to a ledger the day it clears, filed under a category and a person, so the running total is a live figure rather than a statement in three weeks.
3. Show instalments still to come as a schedule against the balance, never as fresh spending.
4. Read one daily number, what is safe to spend until the next salary, computed after savings and after the fixed charges still to land.
5. For the purchases that are a choice, price them the way cost per wear prices a coat: by use, not by the size of the tap.

None of this depends on the card feeling expensive again. It depends on the month being visible, which is a problem a ledger can solve and a payment method cannot. The same is true of a rule like 50/30/20: the percentages are only as good as the ledger that tracks them.

How PeakFinance does it

PeakFinance's bank sync pulls each card's charges as they post, so “charges so far this month” is a live figure per card rather than a statement in three weeks. Instalments are shown for what they are, a cash-timing view of spend already counted in the categories, never added on top of a total.

Savings are the first fixed row of the budget and are moved before the month starts, so what the cards can reach is what is left after them. Safe to spend on the home screen is recomputed from that ledger, so a purchase on any card moves the number the same day, and the forecast to the next salary shows where the remaining instalments land against your floor.

Hen Eytan · Founder, UPeak

Builds the UPeak apps and writes up the research behind them.