Budget Calculator

The 50/30/20 rule is a budgeting framework popularized by Senator Elizabeth Warren in her book "All Your Worth." It divides after-tax income into three buckets: 50% for needs (housing, utilities, groceries, transportation, insurance, minimum debt payments), 30% for wants (dining out, entertainment, hobbies, subscriptions), and 20% for savings and extra debt repayment. It's a guideline, not a strict law — adjust percentages based on your cost of living and goals.

Start with your after-tax monthly income (take-home pay). List all fixed expenses (rent, insurance, loan minimums) and variable expenses (groceries, utilities, dining). Add a savings/investment line. Sum your expenses; if they exceed income, identify wants to cut. A simple check: needs ≤ 50% of income, wants ≤ 30%, savings ≥ 20%. Aim to build 3–6 months of expenses as an emergency fund before focusing on investments.

A common rule is the 30% rule: spend no more than 30% of gross income on rent. Under the 50/30/20 framework, housing is one of several needs — all needs combined should stay at or below 50% of take-home pay. In high cost-of-living cities, 30–40% on rent is common but leaves little margin. If rent alone exceeds 35% of take-home, look to reduce other needs (car payment, insurance) or increase income.

Needs are essentials you cannot live or work without: housing, basic utilities (electricity, water, heat), groceries, basic transportation, health insurance, and minimum loan payments. Wants are things that improve quality of life but are optional: streaming subscriptions, dining out, gym memberships, travel, clothing beyond basics, smartphone upgrades. The line can blur — a car is a need in most US cities, but a luxury car is a want. Ask: "Could I survive without this?" If yes, it's a want.

Use your lowest monthly income (or a 3-month average) as your baseline. Build a buffer: when income is high, save the surplus in a "smoothing" account; draw from it in low-income months. Pay fixed expenses first, then fund savings, then allow discretionary spending. Self-employed or freelance earners should also set aside 25–30% of each payment for taxes before budgeting the rest. Zero-based budgeting works well for irregular income — allocate every dollar each month from scratch.