50/30/20 rule

The rule is three numbers and a base. The base is take-home pay, what lands in the account after taxes and payroll deductions, and the three numbers are the shares of it that needs, wants and saving may take: half, three tenths and one fifth. The first two are ceilings and the third is a floor, so needs at 40% is room rather than a shortfall, and saving at 25% is the goal reached early. The rule has no categories, which is what makes it fast, and it is also why it can say that a month's shape is wrong without saying which line to change.

In a sentence

• "On $4,000 of take-home pay, the 50/30/20 rule allows $2,000 for needs and $1,200 for wants, and asks for $800 of saving."
• "We ran the 50/30/20 rule once and found the problem was the rent, not the coffee."
• "The 50/30/20 rule sets three ceilings and stops; a zero-based budget goes on to decide every dollar."

How it's calculated

1. Start from monthly take-home pay. If retirement contributions leave the paycheck before it arrives, add them back to take-home and count them as saving.
2. Sort a month of spending into the three buckets, with transfers and card payments left out. The test for a need is whether you would keep paying that amount if your income stopped; the rest of a mixed line, the specialty groceries or the upgrade on the car, is a want.
3. Divide each bucket by take-home pay. Those are your shares.
4. Compare each with its rule. Needs and wants over their ceilings and saving under its floor are the findings; the rest is room.

Needs ceiling = take-home pay × 0.50

Wants ceiling = take-home pay × 0.30

Saving floor = take-home pay × 0.20

An example

Take-home pay is $4,000 a month, so the rule allows $2,000 for needs and $1,200 for wants, and asks for $800 of saving.

Needs fit under their ceiling with $40 to spare. Wants run $160 over theirs and saving $120 under its floor, and the rule's whole finding is the size of the move: $160 a month from wants to saving puts every bucket inside the rule, at 30% and 21%. Which want gives up the $160 is a question the rule cannot answer; that is the budget's job.

Why it matters

The rule is a diagnosis that takes ten minutes, before any category budget exists. Its most useful finding is the one a category budget cannot make: whether a month's trouble is its shape or its discipline. A household at 70% needs cannot reach 50% by trimming wants, because the problem is the rent or the car, which change slowly or at the next lease, and knowing that saves a year of cutting coffee. A household at 49% needs and 34% wants has a discipline problem the size of $160, and a cap on two categories fixes it. The mistakes the rule prevents are its own misreadings: applying the percentages to gross pay, where the needs ceiling is fiction; treating 30% as an allowance to fill rather than a limit; and reading a low needs share as a shortfall when it is room.

50/30/20 rule versus zero-based budgeting

The 50/30/20 rule makes three decisions a month and zero-based budgeting makes one per dollar. The rule sets ceilings on two shares and a floor under the third, with no categories inside them; zero-based budgeting assigns every dollar of income to a named category before the month starts, so that income minus everything planned is zero. The rule finds the shape of the problem and cannot say which category is over; zero-based says exactly which, at the cost of twenty minutes a month plus the moves. See Zero-based budgeting.

Common questions

Is the 50/30/20 rule based on gross or take-home pay? Take-home pay, after taxes and payroll deductions; on gross pay the needs ceiling is fiction. If retirement contributions come out before the paycheck, add them back to both take-home and the saving share, or a household saving 10% through payroll reads as saving nothing.

What counts as a need? An expense you would keep paying if your income stopped: housing, utilities, groceries, transport to work, insurance, and the minimum payment on every debt. Most real lines are a need with a want inside them, the store brands against the specialty items, and the want is the difference. See Needs versus wants.

Is the 50/30/20 rule realistic with high rent? Often not, and it is still worth running because it shows the shape. A household at 65% needs cannot reach 50% by cutting wants, and the rule's answer is the honest one: wants give first, the saving floor holds as long as it can, and the rent share itself is the problem when nothing else fits.

Is the 50/30/20 rule a budget? Not on its own. It sets three ceilings and cannot say which category is over or by how much. Run it once as a check, then set amounts on the categories that came out over; the rule finds the shape and the budget changes it.

Go deeper

• The Budget calculator splits your monthly take-home pay into needs, wants and savings with the 50/30/20 rule or shares of your own, and shows the dollar amount each bucket gets.
• What percentage of your income should go to rent, food, and savings sets the rule beside the 30% rent rule, reads both as ceilings and floors, and shows which shares give way when rent runs high.
• Envelope vs. zero-based vs. 50/30/20 budgeting runs the rule and the two other systems on the same month and compares them by how many decisions each asks for.
• Needs versus wants sorts a real month of transactions with the income-stopped test, so the shares the rule compares are true.

Where it shows up in Zypper

Zypper has no pool of money to divide up first, but it keeps the rule's ceilings in view. Categories that trade off against each other, dining out, coffee and entertainment, can be marked Flex to draw from one shared flex budget while each transaction keeps its own category, which applies the wants ceiling to the categories it is meant for. Left to budget, above the category list, is your expected income minus everything budgeted for spending, which is the saving share before the month starts; a negative figure means the plan spends more than you expect to earn. See Flex spending and Creating your budget for the details, or get started with Zypper to set the wants ceiling on your own categories.