How to create a budget

Most budgets fail because they’re too strict or too vague. A good budget does one thing: it gives your money a plan. Here’s a simple, flexible method you can set up in an evening and actually stick to.

Step 1: Know what comes in

Start with your after-tax (net) income — what actually lands in your bank account. Include all income: salary, self-employment drawings, benefits, side income. If your pay varies, use a conservative monthly average.

Step 2: Know where it goes

Track spending for one month if you don’t already know it. Bank app categorisation does most of the work. Group everything into:

• Needs — rent/mortgage, food, bills, transport, minimum loan payments
• Wants — eating out, subscriptions, clothes, hobbies, holidays
• Savings & debt — the money you keep or use to pay off debt faster

Step 3: Apply the 50/30/20 rule

The famous split uses after-tax income:

• 50% needs
• 30% wants
• 20% savings and debt repayment

If your needs run higher — common when housing is expensive — don’t panic. Adjust the ratio and make sure the numbers are honest. The rule is a starting point, not a pass/fail exam.

Example — £2,400 a month after tax. Needs up to £1,200, wants up to £720, savings and debt at least £480. Automate the £480 to a savings account on payday and the rest takes care of itself.

Step 4: Give every pound a job

For a tighter approach, use zero-based budgeting: assign every pound of income to a category until the total reaches zero. This makes overspending visible immediately and works well when income is tight.

Step 5: Review and adjust monthly

Once a month, compare actual spending with the plan. Expect drift — one month of overrunning doesn’t make you a failure. Adjust categories, fix what slipped, and move on. The monthly review is the part that makes budgets durable.

Automate the important bits

• Save on payday — set an automatic transfer so savings happen before spending can touch them
• Pay bills by direct debit — on the right dates, so needs are covered first
• Use separate accounts — a bills account and a spending account make the plan physical

See your own numbers

The budget calculator turns your income into a 50/30/20-style plan in seconds, and the savings calculator shows what your monthly savings could grow into.