How do I create a budget?

Budgets fail when they're aspirational. People estimate their spending, set targets based on the estimate, then abandon the budget when reality doesn't match. Starting from bank statements is less pleasant and much more effective, because it means the first version is already realistic. This describes a method — it isn't financial advice, and it doesn't recommend any product.

What you'll need

• Three months of bank and card statements
• Spreadsheet, notebook or budgeting app
• Recent bills for annual costs (optional)

Step by step

1. Gather three months of statements from every account and card.Three months smooths out one-off months. Include everything — accounts you forget about are where money goes missing.
2. Total your reliable monthly income after tax.If income varies, use the lowest of the three months rather than the average. Budgeting to your best month guarantees shortfalls.
3. List fixed costs: rent or mortgage, utilities, insurance, subscriptions, loan payments.These are the ones you can't easily change month to month. Go through the statements line by line.
4. Convert annual costs to monthly.Car insurance, road tax, TV licence, Christmas, birthdays. Divide by twelve — these are what wreck otherwise sound budgets.
5. Categorise the variable spending from the statements.Food, transport, eating out, clothes, entertainment. Keep it to six or eight categories — more becomes admin you'll abandon.
6. Subtract everything from income and look at what's left, honestly.If it's negative, that's the actual finding, and it's more useful than any target you might have set.
7. Decide how to allocate what's left, including saving.Treat saving as a fixed cost paid at the start of the month, not as whatever remains at the end.
8. Track for one month, then adjust the budget to reality.The first month is data collection. Expect to be wrong and change the numbers rather than abandoning the budget.
9. Review monthly, briefly.Ten minutes. Long reviews get skipped, and a skipped review is how budgets quietly die.

Tips

• Automate transfers on payday — savings, bills, spending. Money you never see in the current account is much easier not to spend.
• Separate accounts for bills and spending removes most day-to-day arithmetic. What's in the spending account is what's available.
• Annual and irregular costs are the most common budget-breaker. A separate sinking fund for them, paid into monthly, is the standard fix.
• If the budget doesn't balance, the answer is either more income or fewer costs. Adjusting the numbers on paper without changing behaviour just moves the problem.

Common mistakes

• Budgeting from estimates rather than statements — Estimates are consistently optimistic. Actual spending is usually higher and in different categories than expected.
• Forgetting annual costs — Insurance, tax and Christmas arrive as apparent emergencies in a budget that never accounted for them.
• Too many categories — It becomes a data-entry job and gets abandoned. Six to eight is plenty.
• Treating savings as leftovers — There are rarely leftovers. Savings work as a fixed cost paid first.

Questions people ask