Budgeting
What is the 50/30/20 budget rule?
Short answer
The 50/30/20 rule splits after-tax income into three parts: 50 percent for needs, 30 percent for wants and 20 percent for saving and extra debt repayment. Elizabeth Warren and Amelia Warren Tyagi described it in their 2005 book All Your Worth. It is a starting guideline, not a law, and high housing costs often push the needs share above 50 percent.
The 50/30/20 rule is a simple way to check where your money goes without tracking every purchase. It was set out by Elizabeth Warren and Amelia Warren Tyagi in their 2005 book All Your Worth, where they call the three groups "must-haves", "wants" and savings. The percentages apply to income after taxes.
The three parts
| Share | Group | What goes in it |
|---|---|---|
| 50 percent | Needs | Housing, utilities, groceries, transportation to work, insurance, minimum debt payments |
| 30 percent | Wants | Dining out, entertainment, subscriptions, travel, hobbies |
| 20 percent | Savings and debt repayment | Emergency fund, retirement and other savings, debt payments above the minimums |
The line between a need and a want is a judgment call. Groceries are a need, but a large share of the grocery bill spent on prepared food may be a want. Choose a rule for each category once, and keep it consistent so your monthly comparisons mean something.
Worked example
Take-home pay is $4,200 a month.
- Needs:
4,200 * 50%= $2,100 - Wants:
4,200 * 30%= $1,260 - Savings and extra debt payments:
4,200 * 20%= $840
In a spreadsheet, put income in B2 and use =B2*0.5, =B2*0.3 and =B2*0.2 for the targets. To compare with what you actually spent, tag each expense with its group and total it: =SUMIF(D:D, "Needs", C:C) / B2 returns the share of income spent on needs, where column D holds the group and column C holds the amount.
If rent, utilities and a car payment alone come to $2,600, your needs are 62 percent of income. That does not mean the plan failed. It shows which numbers to look at: the other two groups have to shrink, or the needs have to fall, if the total is going to fit.
How debt fits
Minimum payments on loans and cards count as needs, because skipping them has penalties. Any extra you pay toward debt counts in the 20 percent, alongside saving. When both are competing for the same 20 percent, the order in which you pay debts matters, which is covered in debt avalanche versus snowball.
When the rule does not fit
- High-cost housing or a low income can make 50 percent for needs unrealistic. Adjust the split, such as shifting more to needs and less to wants, while keeping the savings share as high as you can.
- If you have high-interest debt, a larger share than 20 percent toward it may make sense for a time.
- If payroll deductions such as health insurance or retirement contributions leave your paycheck before it arrives, decide once whether to count them as income, and keep that choice the same each month.
- Irregular income needs a base figure, such as your lowest typical month, rather than the average.
The percentages are a reference point. What matters is that you pick a split on purpose and check it against real spending.
The monthly household budget sheet, which any verified account can download for free, sets budget against actual spending by category, and the annual budget planner spreads the same idea across twelve months. For a longer treatment of keeping a budget going, read a monthly budget spreadsheet that lasts.