The rule is simple: before buying anything non-essential, wait 24 hours.
Impulse purchases are driven by a short dopamine spike triggered by seeing something you want. That spike fades fast — usually within a day.
If you still want the item a day later, it's a real want — not a reflex.
This tiny pause is enough to separate genuine needs from fleeting urges, without requiring willpower, spreadsheets, or giving up things you actually value.
Bonus tip
For bigger purchases (over $100), stretch the rule to 7 days instead of 24 hours. People who try this report far fewer regret-buys.
Try it this week: next time you're about to check out, pause and close the tab first.