Budget calculator

The 50/30/20 budgeting rule explained

The 50/30/20 rule is one of the simplest and most effective budgeting frameworks. Created by Senator Elizabeth Warren in her book All Your Worth, it divides your after-tax income into three broad categories:

• 50% — Needs: Essential expenses you cannot avoid. This includes rent or mortgage payments, groceries, utilities, transport, minimum debt payments and health insurance.
• 30% — Wants: Non-essential spending that improves your quality of life. Dining out, streaming subscriptions, holidays, hobbies and shopping beyond the basics all fall here.
• 20% — Savings & debt: Money that builds your future. Emergency fund contributions, retirement savings, investments and any extra debt payments beyond the minimum.

The rule is deliberately broad — it gives you a framework without demanding you track every coffee. Most people find the 50/30/20 split sustainable because it doesn't ask you to cut everything you enjoy; it simply sets a boundary.

How to track your spending

To apply the 50/30/20 rule you need to know where your money is going. Here is a simple process:

• Collect your statements — pull bank and credit card statements for the last month (or three months for a better average).
• Categorise every transaction — label each one as a need, a want or savings. Be honest: that takeaway coffee is a want, even if it feels like a need on a Monday morning.
• Total each category — add up your needs, wants and savings separately and enter the amounts into the calculator above.
• Compare against the targets — the calculator instantly shows whether your actual spending matches the 50/30/20 split and where you need to adjust.

If you are over on wants, try cutting one or two non-essential subscriptions. If needs exceed 50%, look at refinancing debt, switching utility providers or negotiating rent — small changes add up over a year.

Adjusting the budget for your situation

The 50/30/20 rule is a starting point, not a rigid law. Depending on your circumstances you may need to adjust the ratios:

• High-cost city: If your rent takes 40% of your income, your needs category may push past 50%. That is okay — just be more disciplined about the wants side to keep saving 20%.
• High debt: If you have high-interest credit card debt or student loans, consider pushing your savings-and-debt category to 25-30% temporarily until the debt is under control.
• Close to retirement: Boost the savings category as high as 30-40% and reduce wants accordingly. Your future self will thank you.
• Low income: Needs may naturally take more than 50%. Focus on keeping wants to 20-25% and save whatever you can — even 5-10% is a great start.

The key is awareness. Once you see the numbers, you can make intentional choices rather than wondering where your money went. Use our take-home pay calculator to work out your after-tax income, then apply the 50/30/20 rule with this budget calculator.

Frequently asked questions

What is the 50/30/20 rule?

It is a budgeting framework that splits your after-tax income into three categories: 50% for needs, 30% for wants and 20% for savings and debt repayment. It was popularised by Senator Elizabeth Warren in All Your Worth.

How do I start budgeting with the 50/30/20 rule?

Calculate your monthly after-tax income, track your spending for a month, categorise every expense as a need, want or saving, then adjust until you hit the 50/30/20 targets. Use this budget calculator to check your progress anytime.

What counts as needs vs wants?

Needs are essentials: rent or mortgage, groceries, utilities, transport, minimum debt payments and insurance. Wants are non-essentials: dining out, streaming, holidays, hobbies and shopping beyond the basics.

Is the 50/30/20 rule right for everyone?

The rule is a flexible guideline, not a one-size-fits-all formula. Adjust the ratios based on your income, cost of living and financial goals — high-debt situations may need more savings; low-income households may need more for needs.