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The 50/30/20 rule divides your after-tax income into three buckets:
- 50% for needs: housing, utilities, groceries, transport and minimum debt payments.
- 30% for wants: eating out, entertainment, subscriptions, hobbies and clothes beyond the basics.
- 20% for savings and debt repayment: your emergency fund, retirement contributions and any debt payments above the minimum.
That's the whole rule. Its strength is that you can remember it and apply it in five minutes, without tracking every purchase.
A worked example
Say your take-home pay is $4,000 a month:
| Bucket | Share | Amount |
|---|---|---|
| Needs | 50% | $2,000 |
| Wants | 30% | $1,200 |
| Savings and debt repayment | 20% | $800 |
Use take-home pay, after tax and anything already deducted from your paycheck. If you already save into a workplace retirement plan before the money reaches you, those contributions count toward your 20%.
Telling needs from wants
The line isn't always obvious. A useful test: would you still have to pay it if you lost your job tomorrow? Rent and the electric bill, yes. A streaming subscription, no. Groceries are a need; the difference between groceries and takeout is a want. Minimum debt payments are needs, because missing them has consequences. Anything you pay above the minimum goes in the 20%.
Where the rule breaks down
The split assumes housing fits comfortably inside half your income. In a high-cost city, rent alone can take more than 50%, and the rule stops describing reality. It also suits people with ordinary savings goals: if you want to save aggressively, 20% is a floor, not a target.
Neither problem means the rule is useless. Treat it as a starting point and adjust the percentages to your situation; the point is knowing roughly where your money goes.
Other methods to try
If 50/30/20 doesn't fit, three common alternatives are:
- Zero-based budgeting: every dollar gets a job, including savings, so income minus everything you've assigned equals zero. More effort, clearer picture.
- The envelope method: a fixed amount for each spending category, and when that envelope is empty, spending in that category stops for the month.
- Pay yourself first: an automatic transfer to savings the day you're paid, then you live on what's left.
The best method is the one you'll actually keep using. A simple split you check once a month beats a detailed budget you abandon after two weeks.
Learn it properly
Finance Brain's Budgeting Methods lesson, in the Personal Finance course, covers all four methods side by side and ends with a short quiz. If you've never made a budget before, start with the What Is a Budget lesson just before it.
Finance Brain is educational content, not financial advice.