Key Takeaway: A budget built once a year and never revisited is really just a forecast nobody checks. A useful budget is a living comparison against actual results, monthly.
What's on This Page
Building a Budget From Real Numbers
- Start with the last 6-12 months of actual revenue and expenses by category
- Adjust for known changes. A new hire, a planned marketing push, an expected seasonal swing
- Set a monthly target per category, not just an annual total
Reviewing It Monthly
Compare actual to budget every month, by category. A category running consistently over budget for two months straight is worth investigating immediately, not waiting for a year-end review to notice.
Using Our Business Dashboard Template
Our free Business Dashboard Template tracks revenue, margin, and profit across all 12 months with formulas built in. A practical starting point for this exact comparison.
For further reading, see the U.S. Small Business Administration's guide to managing a business.
Checklist
- Build the budget from 6-12 months of real historical data
- Adjust for known upcoming changes like hires or seasonal swings
- Set monthly targets per category, not just an annual total
- Compare actual to budget every month
- Investigate any category over budget for two months straight
- Revisit and adjust the budget as the year progresses
Common Mistakes
FAQ
What's the biggest weakness of a typical small business budget?
It's built once a year and never revisited, which makes it really just a forecast nobody checks rather than a working tool.
What should a budget be built from?
The last 6-12 months of actual revenue and expenses by category, adjusted for known upcoming changes.
How often should actual results be compared to budget?
Monthly, by category, so a category running consistently over budget is caught within a couple of months, not at year-end.
Should budget targets be set annually or monthly?
Monthly, per category. An annual total alone hides which specific months or categories are actually off track.
Calculate This For Your Business
Related Guides in the Finance Academy
- Business Expenses Guide. the category detail a good budget needs
- Financial KPIs. the numbers to watch alongside the budget
- Cash Flow Guide. another guide in the Finance Academy