The average American spends $314 per month on impulse buys, and 64% of those purchases trigger regret by the end of the week. You do not have a money problem. You have a friction problem. Here are five tricks that fix it in 30 days, and a Plan! setup that keeps you honest.

The five rules that actually work

Behavioural economics beats willpower every time. These five tricks all add friction between you and checkout.

  • 72-hour rule. Any unplanned purchase over $50 sits in a note for three days. Most urges die within 48 hours.
  • Cash-only weekends. Withdraw $80 on Friday. When it is gone, the weekend is over. Your hand hesitates in a way a card does not.
  • Delete marketplace apps. Amazon, Temu, Shein. You keep the websites; you lose the one-tap checkout. Conversion drops by roughly 30%.
  • Shop with a list. Grocery runs without a list cost 23% more. Write three items. Buy three items.
  • Redirect the urge into a goal. Every time you skip an impulse buy, move the exact amount into a Savings goal in Plan!. The $64 sneakers become $64 closer to Lisbon.

Why these work when New Year resolutions fail

Willpower is a finite battery that drains by dinner. Friction does not drain. Deleting the Amazon app once saves you 400 micro-decisions a month. Cash in your pocket does not ask if you are sure. A three-day waiting period lets your prefrontal cortex catch up with your amygdala. You are not trying to be a better person. You are trying to be a slightly less convenient one.

Set up the Impulse category in Plan!

Plan! turns the trick into a habit loop. Create an Expense goal called "Impulse" with a monthly cap of $100. Every unplanned purchase gets logged there, not hidden in Groceries or Misc. The Spotify-style yearly report surfaces what you actually spent on dopamine in 2025, in one beautiful chart.

  1. Open Plan!, add an Expense goal named Impulse, cap at $100/month.
  2. Create a Savings goal called "Skip jar" with a $500 target.
  3. Use the Plan! Siri shortcut "Add $20 to Skip jar" every time you walk past a temptation.
  4. Review the Impulse chart every Sunday. Cap drops by $10 each successful week.
Skipping one $15 impulse buy a day for a year equals $5,475. That is a flight to Tokyo and a week of ramen.

The 30-day timeline

Week 1: delete one marketplace app, install Plan!, start the 72-hour rule. Week 2: go cash-only on weekends. Week 3: every skipped purchase moves to your Skip jar goal. Week 4: review the Impulse chart; most people land at 40% below their starting month. The habit is baked after 21 days, automatic after 30.

Checklist

  1. Delete one marketplace app today.
  2. Create an Impulse expense goal in Plan!.
  3. Start the 72-hour waiting rule on anything over $50.
  4. Open a Skip jar Savings goal and funnel skipped purchases there.
  5. Review weekly in Plan!'s chart view.

Thirty days from now, the impulse reflex will feel slower and quieter. The money will show up on your Savings bar in Plan!.