Budgeting & Income

50/30/20 Budget Calculator

The 50/30/20 rule is budgeting without a spreadsheet: 50% of after-tax income for needs, 30% for wants, 20% for savings and extra debt payments. Enter your monthly take-home pay to get your three dollar targets — and what the 20% quietly builds over a year.

Formula shown below · Tested against worked examplesHow we verify

Monthly after-tax income

Your actual take-home pay. Not sure? Run the Take-Home Pay Calculator first.

Save & pay down debt (20%)

$1,040

Needs (50%): $2,600
Wants (30%): $1,560
Savings per year at this rate: $12,480

Needs (50%)$2,60050%

Wants (30%)$1,56030%

Savings (20%)$1,04020%

Compare scenariosTry three values of one input

Vary

50/30/20 Budget Calculator results for three values of Monthly after-tax income
Monthly after-tax income
Save & pay down debt (20%)	$940	$1,040+$100	$1,140+$200
Needs (50%)	$2,350	$2,600+$250	$2,850+$500
Wants (30%)	$1,410	$1,560+$150	$1,710+$300
Savings per year at this rate	$11,280	$12,480+$1,200	$13,680+$2,400

Every other input stays at the value you set above — currently $5,200 for monthly after-tax income. Differences are measured against the first column.

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How this calculator works

The split is computed in exact cents with the savings bucket taking the remainder, so the three parts always sum to your income precisely. Apply the percentages to actual take-home pay, not gross salary — that's the rule as designed.

Formula

Needs   = Net pay × 0.50
Wants   = Net pay × 0.30
Savings = Net pay × 0.20

Net pay: Take-home pay after tax and deductions — not gross

The split runs on net pay. Using gross builds a budget short by a fifth before the month begins. Only the minimum payment on a debt is a need; anything above it belongs in the 20%.

What this assumes

The split applies to take-home pay, not gross. Using gross builds a budget short by a fifth before the month begins.
Only the minimum payment on a debt is a need; anything above it belongs in the 20%.
Employer retirement contributions withheld before you see them count toward the 20%.

What changes this number

Housing cost: The largest line in almost every budget, and the reason a 50% needs share is unreachable in expensive cities.
What counts as a need: Where budgets leak. If losing it would not disrupt your ability to work, stay housed or stay safe, it is a want.
Automating the 20%: Moving it on payday converts a monthly discipline problem into a one-off setup.

A worked example

Take the $4,000 take-home scenario. These figures are produced by the calculator above, not written alongside it, so they always match what the tool returns.

What you enter

Monthly after-tax income: $4,000

What it returns

Save & pay down debt (20%): $800
Needs (50%): $2,000
Wants (30%): $1,200
Savings per year at this rate: $9,600

Sources

This calculator uses no external data — the result follows entirely from the formula above and the values you enter, so there is nothing to cite beyond the arithmetic.

Calculator last reviewed August 9, 2026. How we verify

Try an example

$4,000 take-home $6,500 dual income $3,200 starting out

Frequently asked questions

What is the 50/30/20 rule?

A budgeting framework popularized by Senator Elizabeth Warren: cap needs at 50% of after-tax income, wants at 30%, and direct 20% to savings and extra debt payments. Its power is simplicity — three buckets you can actually track instead of thirty categories you'll abandon.

What counts as a need vs a want?

Needs are what you must pay to live and work: housing, utilities, groceries, insurance, transport, minimum debt payments. Wants are everything you'd cut in a crisis: restaurants, subscriptions, travel, upgrades. The honest test: 'would I still pay this the month after a job loss?'

What if my needs exceed 50%?

Common in high-cost cities — the rule is a compass, not a law. Options: rebalance to 60/20/20, attack the biggest need (housing usually), or grow income. What matters most is protecting SOME fixed savings percentage; even 10% automated beats 20% aspirational.

Does the 20% include my 401(k)?

The classic rule works on after-tax income, so pre-tax 401(k) contributions are extra credit on top. If you prefer one number, add your 401(k) percentage mentally — someone deferring 8% pre-tax plus hitting the 20% here is saving at an excellent rate.

This calculator helps answer

What will I actually take home?

Turn a salary offer into the number that reaches your account, then check what a raise, a contribution change or self-employment does to it.