The three-bucket budget you will actually stick to
Maria earns $4,000 a month after taxes and has tried budgeting four times this year. Each attempt collapsed under the weight of 25 spending categories she had to track. Then she switched to a rule with exactly three buckets, and for the first time the plan survived past week two. That is the quiet power of the 70/20/10 rule: it is simple enough to remember in your head and flexible enough to live with.
The split is right there in the name. Seventy percent of your take-home pay goes to living expenses, twenty percent to savings, and ten percent to debt repayment or charitable giving. For Maria's $4,000, that is $2,800 for living, $800 to savings, and $400 toward debt or donations. No spreadsheet with formulas, no app pinging her about a $6 coffee. Three numbers she can recite from memory.
What goes in the 70%. This is everything it takes to run your life: rent or mortgage, groceries, utilities, transportation, insurance, phone, and reasonable fun like dining out and streaming. Keeping all of that under 70% is the real discipline. If your rent alone eats 40% of take-home pay, the other living costs have to fit in the remaining 30%, which forces honest tradeoffs before they become overdrafts.
The 20% and 10% are where wealth quietly builds. The 20% savings bucket funds your emergency cushion first, then retirement accounts and longer-term goals. The 10% is deliberately flexible: if you carry credit card or student loan debt, send it there to attack the balance faster; if you are debt-free, redirect it to giving or extra investing. Maria's $800 monthly into savings adds up to $9,600 a year before any growth, and her $400 against a credit card balance can shave years off the payoff. This calculator does the split instantly so you see your three numbers the moment you enter your income.