Budget Calculator 2026 — 50/30/20 Rule

The 50/30/20 rule allocates your after-tax (take-home) income into three buckets: 50% for needs (rent/mortgage, utilities, groceries, minimum debt payments, insurance, transport), 30% for wants (dining out, entertainment, streaming, hobbies, travel), and 20% for savings and debt repayment (emergency fund, retirement accounts, investments, extra debt payments). Popularised by Senator Elizabeth Warren in her book All Your Worth (2005), it remains the most widely-used budgeting framework globally.

Always use your net (take-home) income — the amount deposited in your bank after income tax, National Insurance (UK), Social Security and Medicare (US), or equivalent deductions. Gross income overstates what you actually have to spend. If your gross salary is £40,000 in England (2026/27), your net is approximately £31,270/year (£2,606/month) after income tax and NI — that is the figure you divide by the 50/30/20 percentages.

It is challenging in high-cost areas. Research shows the average UK savings rate is just 7% — less than half the 20% target. In London, rent alone can exceed 50% of take-home pay on a £30,000 salary. If your needs exceed 50%, switch to a 60/20/20 or 70/15/15 split. The key is protecting at least 10–15% for savings regardless of location. The calculator supports custom percentage splits for this reason.

The rule is highly applicable in India with local context: needs typically include rent, groceries, EMI payments (home loan, car loan), utilities, and insurance. Wants include eating out, OTT subscriptions, shopping, and travel. The 20% savings bucket should prioritise: emergency fund (3–6 months expenses), then PPF (₹1.5L/year, 7.1% tax-free), NPS (80CCD deduction), and ELSS mutual funds (80C). For anyone with credit card debt (36% APR), redirect the full 20% to debt payoff first before investing.

This is common in high cost-of-living areas. Options: (1) Switch to 60/20/20 — increase needs to 60%, reduce wants to 20%, keep savings at 20%. (2) Use 70/20/10 — very tight budgets where saving 10% is the priority. (3) Audit needs: some expenses categorised as "needs" are actually wants (premium phone plan, gym membership, subscriptions). (4) Increase income through negotiation, promotion, or side income. The minimum savings rate to protect regardless is 10%.

Needs: rent/mortgage payment, council tax (UK) or property tax, electricity, gas, water, groceries (basic food), public transport or minimum car costs, health insurance, minimum debt payments, childcare if required for work. Wants: restaurants and takeaways, streaming services (Netflix, Spotify), gym membership, hobbies, shopping, holidays, upgraded phone plans, alcohol. The test: could you survive without it for a month? If yes, it is a want.

The standard recommendation is 3–6 months of essential expenses in an easily accessible account. For a single person with stable employment, 3 months is typically adequate. For self-employed, single-income households, or those in unstable industries, 6 months is safer. US personal savings rate is just 4.5% (January 2026, BEA) — most households have no emergency fund at all. Start with ₹50,000 / £1,000 / $1,000 as a starter fund, then build to the 3-month target over 6–12 months.