Behavioural economists have known for years what most of us learn the hard way: human beings are terrible at making financial decisions in the moment. We are wired for immediate gratification, susceptible to clever marketing, and reliably bad at estimating how much we will regret a purchase once the novelty has worn off. The 24-hour rule is one of the simplest and most effective antidotes.
Table of Contents
What Is It?
The 24-hour rule is straightforward: before purchasing anything non-essential above a threshold you set for yourself (many people use £30 or £50), you wait 24 hours. You do not add it to your basket. You do not save it for later. You simply wait.
If after 24 hours you still want it and can genuinely afford it, you buy it. In most cases, you will find the urge has passed — or you will buy it with clearer eyes and less post-purchase regret.
The Psychology Behind It
The rule works by interrupting what psychologists call the hot-cold empathy gap. When we encounter something desirable, we are in a “hot” emotional state — excited, slightly irrational, and poorly calibrated to our future selves. Sleeping on a decision moves us into a “cold” state, where we are better able to weigh up whether the purchase genuinely aligns with our values and goals.
Research from the Money and Mental Health Policy Institute also highlights the link between impulsive spending and stress, anxiety, and low mood — making the 24-hour rule as much a mental health habit as a financial one.
Adapting the Rule
Some people extend it: a week for anything over £200, a month for anything over £1,000. Others apply it only to online shopping, where the friction-free checkout process is deliberately engineered to remove hesitation. You can adapt the rule to your spending patterns and triggers.
Pair this habit with a simple monthly spending review and you have the foundation of a genuinely healthy relationship with money — no complex spreadsheets required.
Start Today
The next time you feel the pull of an impulse purchase, screenshot it or note it down and set a reminder for tomorrow. That single action, repeated consistently, compounds into thousands of pounds saved and significantly less financial anxiety over time.