How the budget is added up
Each row is a monthly amount. The rows in each group are added up, everything is taken away from your take-home pay, and what remains is the money you have not planned for yet. Each group is then shown as a share of your take-home pay, next to the 50/30/20 split.
Left over = take-home pay − needs − wants − savings and debt
Share of a group = group total ÷ take-home pay × 100
50/30/20 amounts = take-home pay × 0.50, 0.30 and 0.20
Worked example: $5,000 a month
The example rows add up to $2,700 of needs, $530 of wants and $650 of savings and extra debt payments, $3,880 in all. That leaves $1,120 unplanned. Needs are 54% of take-home pay, $200 above the $2,500 the rule suggests. Wants are 10.6%, well under $1,500, and savings are 13%, $350 short of $1,000. If the $1,120 left over went into savings, savings would be 35.4% of income.
Where the 50/30/20 rule comes from
The split was popularized by Elizabeth Warren and Amelia Warren Tyagi in All Your Worth: The Ultimate Lifetime Money Plan (Free Press, 2005). They called it a balanced money formula: no more than half of after-tax income on must-have bills, 30% on wants, and 20% on saving and paying off debt. It is a rule of thumb: easy to remember and a fair first check, but not a standard every household should meet. Where rent is high or income is low, needs alone can take more than half.
Tips for a budget that holds up
- Fill in the rows from last month’s bank and card statements rather than from memory, so small regular purchases are counted.
- Turn yearly bills, such as car registration or an insurance premium paid once a year, into a monthly amount by dividing by 12.
- Give the leftover a job: move it to savings or an extra debt payment on payday, before it gets spent.
- For a savings target with a date, the savings goal calculator works out the monthly amount to put in the savings rows.
Questions people ask
What is the 50/30/20 rule?
A simple way to split take-home pay: 50% on needs, 30% on wants and 20% on savings and paying down debt. It was popularized by the 2005 book “All Your Worth: The Ultimate Lifetime Money Plan” by Elizabeth Warren and her daughter Amelia Warren Tyagi. It is a rule of thumb, not a law of personal finance, so use it as a yardstick rather than a target you must hit.
What counts as a need and what is a want?
A need is a bill you would have to pay even if you lost your job tomorrow: rent or mortgage, utilities, basic groceries, insurance, transportation to work and the minimum payment on every debt. A want is something you could stop or cut back on: eating out, streaming services, hobbies, new clothes beyond the basics and vacations. Some costs are part need, part want, such as a phone plan; put the basic cost under needs and any upgrade under wants.
Should I use my gross pay or my take-home pay?
Take-home pay: what lands in your bank account after taxes and anything taken out of your paycheck. If you put money into a 401(k) through payroll, you can add that amount to income and list it as a savings row, so the rule counts it as saving.
What if my needs are more than 50%?
That is common in high-rent areas and on lower incomes. The rule is a starting point. If needs take 60%, a split such as 60/20/20 or 60/30/10 can still work. The useful part is seeing where the money goes, then deciding on purpose where any change should come from.
Is my budget saved or sent anywhere?
It is saved only in this browser on this device (local storage), so it is still there when you come back. It is never uploaded. Clearing your browser data or using a private window removes it. Use “Reset to example” to start over.
How do I print my budget?
Press “Print budget”. The printout shows every row, the totals and the 50/30/20 comparison, without the buttons and site menus. Choose “Save as PDF” in the print dialog to keep a copy.