50/30/20 budget calculator

By The Income Tracker · Updated 8 September 2026

What counts as a need, a want, and savings

• Needs: rent or mortgage, council tax, energy, water, broadband, basic food, transport to work, insurance, minimum debt payments. The things you must pay whatever happens.
• Wants: eating out, subscriptions, clothes beyond the basics, holidays, hobbies, the nicer version of anything.
• Savings: emergency fund, pension top-ups, ISA contributions, and any debt payment above the minimum.

Where the rule comes from, and its limits

It was popularised by Elizabeth Warren and Amelia Warren Tyagi in All Your Worth (2005) as a rough shape for a healthy budget, not a law. In expensive parts of the UK, rent alone can pass 40% of take-home pay, which pushes needs over half. That does not make the rule useless; it tells you the problem is the fixed costs, not the coffee.

Find your real split in two minutes

Guessing the needs and wants figures defeats the point. Import last month's bank CSV into The Income Tracker, and the category totals give you the real numbers to type into the boxes above. Better still, the tracker shows the split every month without the typing.

Frequently asked questions

What is the 50/30/20 rule?

A budgeting guideline that puts 50% of take-home pay towards needs, 30% towards wants and 20% towards savings and debt repayment. It comes from Elizabeth Warren and Amelia Warren Tyagi's 2005 book All Your Worth.

Is the 50/30/20 rule realistic in the UK?

As a target, yes. Where rent is high, needs often exceed 50%, which the calculator will show. Treat it as a diagnosis rather than a failure.

Does the 20% include pension contributions?

Contributions taken from your pay before tax are already out of your take-home figure. Count any extra you add from take-home pay towards the 20%.

Is this calculator free?

Yes, and nothing you type leaves your browser.

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