How to Build a Monthly Budget
Budgeting is three questions: what comes in, what goes out, and what is left. This guide walks you through answering them for the first time without special software.
Start with what actually happened last month
Most budgets fail because they start with wishes instead of facts. Before deciding what you should spend, spend thirty minutes finding out what you did spend. Pull up last month's bank and card statements and sort everything into a handful of categories: housing, food, transport, subscriptions, and everything else.
The first look is usually uncomfortable, and that is the point. You cannot fix a number you have never seen.
Give every category a number
Now set a realistic number for each category, starting from last month's reality rather than an ideal. If groceries were 800, budgeting 400 will fail by the second week. Set 700 and let the number come down over months.
Fixed costs like rent and insurance are easy. The variable categories are where the decisions live, so keep them few and broad. Five categories you track beat fifteen you abandon.
Check in weekly, adjust monthly
A budget is not a document, it is a habit of looking. Ten minutes a week logging spending keeps the picture honest, and a short month-end review tells you which numbers to adjust.
Any spreadsheet can do this. If you want one where the summaries and year view are already built, our Monthly Budget Spreadsheet is designed around exactly this weekly routine.