Start with a simple workbook that captures three things each month: what you planned to spend, what you actually spent, and the difference. Excel makes this easy to update weekly (or daily) so you’re not trying to remember everything at the end of the month.
Open a new workbook and name the first sheet “Monthly Budget.” In Row 1, add headers: Category, Planned, Actual, Difference, Notes. In Column A, list your categories (Rent/Mortgage, Utilities, Groceries, Gas/Transit, Insurance, Debt Payments, Subscriptions, Dining Out, Shopping, Savings, Misc.).
In the Difference column, subtract Actual from Planned (for example, in D2: =B2-C2) and copy the formula down. At the bottom, add totals for Planned and Actual using SUM (for example, =SUM(B2:B20) and =SUM(C2:C20)). Add a final Difference total to see whether you’re under or over for the month.
Create a second sheet called “Transactions” with Date, Description, Category, Amount, and Payment Method. Enter purchases as they happen. At month-end (or weekly), total each category and paste those totals into the “Actual” column on your Monthly Budget sheet.
Use conditional formatting on the Difference column to highlight overspending (negative numbers) in red and staying under budget in green. Freeze the top row so headers stay visible, and format currency columns as dollars.
Duplicate the “Monthly Budget” sheet for each new month, rename it (e.g., “April 2026”), and update only the Planned amounts as your priorities change.
For a more complete monthly setup—plus tips for planning, saving, and adjusting categories—visit this monthly budgeting toolkit guide.
Schedule a quick check-in twice a week to enter transactions and review category totals. Keeping the “Transactions” sheet on your phone via OneDrive or Google Drive also reduces missed entries.
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