Budget Calculator

The 50/30/20 rule is a simple budgeting framework popularized by Senator Elizabeth Warren in her book 'All Your Worth.' It divides your after-tax income into three categories: 50% for needs (essential expenses like housing, utilities, groceries, transportation, and insurance), 30% for wants (discretionary spending like dining out, entertainment, subscriptions, and hobbies), and 20% for savings and debt repayment (emergency fund, retirement contributions, investments, and extra debt payments). The rule provides a starting point — not a rigid law — and can be adjusted based on your income level, cost of living, and financial goals.

To calculate your monthly budget, start with your net (after-tax) monthly income. Then list all your monthly expenses and assign each one to a category: needs, wants, or savings. Add up each category and divide by your income to find the percentage. Compare your actual percentages to the 50/30/20 targets. If your needs exceed 50%, look for ways to reduce fixed expenses like housing or transportation. If you're spending too much on wants, identify discretionary spending to cut back. The goal is to ensure at least 20% goes toward savings and debt reduction.

Needs are expenses you cannot avoid without significant consequences to your health, safety, or financial stability. These include rent or mortgage payments, utilities (electricity, water, internet), groceries, transportation costs (car payment, gas, or transit), insurance premiums (health, auto, renters/homeowners), and minimum debt payments. Wants are discretionary expenses you choose to spend on for enjoyment or convenience but could live without. Examples include restaurant meals, streaming subscriptions, gym memberships, clothing beyond basics, entertainment, travel, and hobbies. The line can sometimes blur — for example, a basic phone plan is a need, but an expensive data plan with extras may partially be a want.

The 50/30/20 rule recommends saving at least 20% of your net income each month. This savings allocation should cover your emergency fund (aim for 3–6 months of living expenses), retirement contributions (take advantage of employer 401(k) matches first), and other investment or debt payoff goals. If 20% isn't currently achievable, start with whatever you can and gradually increase. Even 5–10% consistently invested over time can compound significantly. Prioritize high-interest debt repayment alongside retirement savings — the math often favors paying off debt with rates above 6–7% before investing heavily.

If your total expenses exceed your income, you're running a deficit and likely accumulating debt or depleting savings. Start by reviewing your needs category — if housing costs more than 30% of income alone, consider moving, taking in a roommate, or finding a less expensive area. For wants, identify non-essential subscriptions and dining habits you can cut. If trimming expenses isn't enough, focus on increasing income through overtime, a side hustle, or seeking a higher-paying position. Create a short-term spending plan to eliminate the deficit, and build toward the 50/30/20 targets over time rather than all at once.

The 50/30/20 rule is a general guideline and may not fit every situation. High cost-of-living cities may require 60–70% of income just for needs, leaving little room for the 30/20 split. Lower-income households may struggle to hit 20% savings while covering essentials. Conversely, high earners may be able to save far more than 20%. The rule also uses after-tax income, so if you contribute to a pre-tax 401(k), those contributions reduce your taxable income but should still count toward your 20% savings target. The 50/30/20 framework is most valuable as a diagnostic tool — it shows you where your money is going and helps you make intentional choices about trade-offs.