The 50/30/20 rule, popularized by Senator Elizabeth Warren, divides your after-tax income into three buckets:

50% Needs: Essentials you cannot skip — rent/mortgage, groceries, utilities, insurance premiums, minimum debt payments, transportation to work.

30% Wants: Things you enjoy but could live without — dining out, streaming subscriptions, vacations, hobbies, new clothes beyond basics.

20% Savings & Debt Repayment: This is your wealth-building bucket — emergency fund contributions, retirement accounts (401k/IRA), index fund investments, and debt payments *above* minimums.

Example on a $5,000/month take-home: - Needs: $2,500 (rent $1,400 + groceries $300 + insurance $400 + transport $400) - Wants: $1,500 (dining $400 + streaming $100 + gym $50 + entertainment $950) - Savings: $1,000 (401k $500 + emergency fund $300 + extra debt $200)