The 50/30/20 rule is the most-searched budgeting method for a reason: it's simple enough to remember and flexible enough to survive real life. Here's how it works — and how to run it without doing any math.
The rule in one paragraph
Split your after-tax income three ways: 50% to needs (housing, utilities, groceries, insurance, minimum debt payments), 30% to wants (dining out, entertainment, subscriptions, shopping), and 20% to savings and extra debt payoff. On a $4,200 take-home, that's $2,100 / $1,260 / $840.
Where people go wrong
Counting wants as needs. The gym membership and the meal kit are wants. Be ruthless once, then stop re-litigating.
Treating 20% as a leftover. Savings goes out first — automatic transfer on payday — or it doesn't happen.
High-rent cities. If housing alone eats 40%, run 60/20/20 instead and revisit yearly. The ratio matters less than tracking against a target at all.
Do it without the math
Start free: our One-Page Budget Starter ($0) calculates totals, leftover cash, and savings rate the moment you type your numbers. When you want per-category tracking across all 12 months, the 2026 Budget Dashboard ($12, code LAUNCH20 for 20% off) logs every transaction and shows exactly which bucket is over. Both work in Excel and Google Sheets.