Cedar LedgerBudget & net worth ledger

Budgets kept the old way, in columns, in your browser.

50/30/20 budget calculator

Split your after-tax income into needs, wants and savings the way Elizabeth Warren and Amelia Warren Tyagi lay it out in All Your Worth, then see how what you really spend compares.

Entries

What you actually spend a month

Optional. Leave a box empty to see only the targets.

Change the split

The book's shares are 50, 30 and 20 percent. Try another split to see how the targets move; the three must add up to 100.

Educational use only — not financial advice

Statement

After-tax income $4,000.00 a month · $48,000.00 a year

Monthly 50/30/20 targets compared with actual spending
BucketShareTargetActualDifference
Needs50%$2,000.00$2,250.00$250.00 over
Wants30%$1,200.00$1,150.00$50.00 under
Savings & debt20%$800.00$600.00$200.00 short
Total100%$4,000.00$4,000.00

Guideline

Your spending

  • Needs 50% → 56.3%
  • Wants 30% → 28.7%
  • Savings & debt 20% → 15%
  • Needs: 56.3% of income, 6.3 points above the 50% guideline.
  • Wants: 28.7% of income, 1.3 points below the 30% guideline.
  • Savings & debt: 15% of income, 5 points below the 20% guideline.


How the 50/30/20 rule works

In All Your Worth (2005), bankruptcy scholar Elizabeth Warren and her daughter Amelia Warren Tyagi suggest dividing after-tax income into three parts: 50% for must-haves, 30% for wants and 20% for savings. The calculator turns your income into those three monthly targets, then lines up what you actually spend beside them.

Start from take-home pay, after income tax and anything deducted at source. If you are paid every two weeks or every week, choose that and the calculator converts it to a monthly figure (26 or 52 pay days spread over 12 months), so a $2,000 fortnightly pay becomes $4,333.33 a month.

Worked example. With $4,000 a month the targets are $2,000 for needs, $1,200 for wants and $800 for savings. Spending $2,250 on needs puts that bucket 6.3 points above its 50% share; the statement marks it in red ink and shows that savings are $200 short of the target. The rule is a yardstick, not a verdict: where housing costs are high, needs often take more than half, and the useful question is which bucket the gap comes from.

Sources


Index of the ledger

Four more pages of the same book, each saved only in your browser.


Questions

Should the 50/30/20 rule use income before or after tax?

After tax. The book works from take-home pay: what reaches your account after income tax and other deductions. If your pension contributions come out of your pay before it arrives, you are already saving that money, so you can add it to the savings figure and to your income to see the full picture.

Do debt payments count as needs or savings?

Both, split by purpose. The minimum payment you must make on a loan or card is a need, because missing it has consequences. Anything you pay above the minimum to clear the balance sooner goes in the savings and debt bucket, since it improves your future position just as saving does.

My needs are well over 50%. Is the rule useless for me?

No, it still shows where the pressure is. Open "Change the split" and try a version that matches your situation, such as 60/30/10, then compare it with your real spending. The calculator only does the arithmetic; how to close a gap depends on your circumstances.

Is anything I type saved or sent anywhere?

No. The figures on this page are worked out in your browser and are not stored or sent anywhere. Only your currency choice and light or dark theme are remembered, in this browser's local storage.