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A 13-week cash flow forecast is one of the most practical tools for startup founders, CFOs, and business operators. It helps you:
Use a spreadsheet with 13 columns (one for each week) and rows for cash categories. Include cash in, cash out, and net balance.
Start with the actual bank balance on Day 1 of Week 1. This is the foundation for your rolling forecast.
List every expected incoming payment:
Plan for:
Formula:
Closing Cash = Opening Cash + Total Inflows – Total Outflows
This balance becomes the opening cash for the following week.
Create three versions:
Every week, replace forecasted numbers with actual data. Then roll the sheet forward by one week to keep the 13-week horizon intact.
| Week | Opening Cash | Cash In | Cash Out | Closing Cash |
|---|---|---|---|---|
| 1 | $50,000 | $20,000 | $15,000 | $55,000 |
| 2 | $55,000 | $10,000 | $18,000 | $47,000 |
A 13-week cash flow forecast isn’t just a spreadsheet—it’s a decision-making tool. When kept current, it gives business leaders the clarity to anticipate problems and capitalize on opportunities.
Would you like a downloadable 13-week cash flow Excel template to get started?
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