13-Week Cash Flow Forecast: What It Is and How to Build One

The short answer

A 13-week cash flow forecast is a weekly projection of receipts, payments and bank balance over one quarter. Lenders, restructuring advisers and finance teams use it because weekly detail catches payroll and supplier timing problems that monthly forecasts hide, while 13 weeks is still short enough to predict accurately.

Why 13 weeks?

Thirteen weeks is one quarter. It is long enough to see a payroll cycle, a tax payment and a slow-paying customer all at once, and short enough that most of the cash is already known: invoices are out, bills are scheduled, staff costs are fixed.

When you need one

Cash is tight and you need to know which week is the pinch point
You pay staff weekly or fortnightly
A bank or lender has asked for one
You are going through a turnaround, refinancing or a large project

What goes in it

Section	Typical lines
Receipts	Collections from existing invoices, new sales, other income
Operating payments	Payroll, rent, suppliers, utilities, software
Non-operating	Loan repayments, tax, capital purchases
Financing	Credit line draws and repayments
Balance	Opening, net flow, closing, minimum buffer

How to build it

Set week 1 to start on the Monday after today.
Enter collections from your aged receivables, week by week, based on how each customer really pays.
Add scheduled payments from your bills and payroll calendar.
Calculate closing balances and flag any week below your buffer.
Every week, replace week 1 with actuals and add a new week 13.

Free and premium templates

Industry templates link a 13-week weekly view to a 12-month monthly view, so you plan short term and long term in one file. Browse them by industry.

Questions people ask

Who uses a 13-week cash flow forecast?

Small and mid-size businesses, lenders, turnaround consultants and CFOs. It is standard in restructuring and bank covenant reporting.

Is a 13-week forecast direct or indirect?

Almost always the direct method: specific receipts and payments listed week by week.

How often should I update it?

Every week. Replace the finished week with actual figures and add a new week at the end.