A monthly budget means deciding where your income will go before the month begins. Budgeting isn't about restriction; it's about taking control of your money, never having to ask "where did it all go?" at the end of the month, and making steady progress towards your savings goals.

Short answer: First work out your monthly take-home income. Then list your fixed costs such as rent, bills, loan payments and subscriptions, followed by the amounts you'll set for variable costs like groceries, transport and entertainment. Don't leave saving until the end of the month; set it aside as soon as your income arrives. Put a little aside each month for yearly costs, record your spending during the month, and compare your plan with what actually happened at the end of it.

1. Work out your monthly take-home income

Your budget is built on what actually reaches your account, not your gross salary. As well as your salary, include other regular income such as rental income, side work or a grant.

If your income varies from month to month (freelancers, people on commission), use your lowest monthly income from the last six months as the basis of your budget. In months when you earn more, move the extra into savings or a buffer for leaner months.

2. List your fixed costs

Fixed costs are roughly the same every month and have to be paid:

• Rent or mortgage, service charges
• Electricity, water, gas, internet and phone bills
• Loan and instalment payments
• Credit card payments
• Insurance
• School and course fees

For items whose amount varies, such as bills, use the average of the last few months, and allow for seasonal differences such as heating in winter.

3. Add debt and subscription payments

Subscriptions and personal debt repayments are also part of the fixed side of your budget, but because they're small and scattered, they're the easiest to forget. Gather all your subscriptions and the debt instalments due that month under their own heading. For more detail, see How to track your subscriptions and How to track debts and receivables.

4. Pay yourself first

Saving "whatever is left at the end of the month" rarely works, because there's usually nothing left. Instead, move a set amount into a separate account on the day your income arrives. Even if the amount is small, consistency is what matters.

As a general guide, building an emergency fund that covers about three to six months of essential expenses helps you avoid debt if you lose your job or face an unexpected cost.

5. Split yearly costs into monthly amounts

Costs that come once or a few times a year, such as taxes, insurance renewals, annual subscriptions, holidays and school costs, can wreck the budget of the month they arrive. Add up their yearly total, divide it by 12 and set that amount aside every month.

Example: For a £600 yearly insurance renewal and £300 of annual vehicle tax, you set aside (£600 + £300) ÷ 12 = £75 each month. When the bill arrives, the money is ready.

6. Set amounts for variable costs

Groceries, transport, eating out, clothing, entertainment and personal care change from month to month. Look at your last two or three months of statements and set a realistic amount for each category. These limits tell you how much you can spend during the month.

Which budgeting method suits you?

• The 50/30/20 rule: Roughly 50% of take-home income goes to needs (rent, bills, groceries), 30% to wants (entertainment, eating out, hobbies) and 20% to savings and debt repayment. It's simple and easy to remember; adjust the percentages to your situation.
• Zero-based budgeting: Every pound of income is given a job at the start of the month, so income minus all categories equals zero. It takes more effort but shows most clearly where your money goes.
• The envelope method: Each variable spending category gets its own "envelope" (cash or a separate account); when the envelope is empty, spending in that category stops. It works well if you want to curb overspending.

Example monthly budget

The example below is for someone with a monthly take-home income of £3,000:

• Rent and service charges: £1,000
• Bills: £250
• Loan repayment: £200
• Subscriptions: £60
• Monthly share of yearly costs: £75
• Groceries: £400
• Transport: £150
• Eating out and entertainment: £250
• Clothing and personal care: £120
• Savings: £495

The total is £3,000; every pound has a job.

7. Record your spending during the month

A budget only works if you follow it. Record expenses as you make them or, at the latest, at the end of each day. Once a week, check how much is left in your variable categories; if you're close to the limit in one, be more careful there for the rest of the month.

8. Review at the end of the month

When the month ends, compare what you planned with what you actually spent. If you consistently go over in one category, either cut back there or update the budget to a more realistic amount. A budget isn't a fixed document; it gets a little more accurate every month.

Common mistakes

• Budgeting with your gross salary: You plan to spend money you never receive.
• Leaving saving until the end of the month: There's usually nothing left.
• Forgetting yearly costs: They throw off the month they arrive in.
• Setting overly strict limits: An unsustainable budget is soon abandoned.
• Not recording spending: You can't tell whether the plan is working.

Debts, receivables and subscriptions at a glance with BudPlan

The monthly overview on BudPlan's My Budget screen shows the receivables, debt payments, subscription payments and net result for the month you choose. Seeing these fixed items in advance makes it easier to plan the rest of your spending. Due dates appear on the calendar, and with notifications you won't miss a debt or subscription payment. To track your income and everyday spending by category, take a look at our Income & Expense Tracker app too.

Last updated: 7 October 2026

Related guides:

• How to track your subscriptions
• How to track debts and receivables
• A calendar system so you never miss a due date