CFO & Accounting · Cash Flow
13-Week Cash Flow Forecasting
A rolling, weekly-updated forecast that shows a cash crunch three weeks out — not the week payroll is due.
Most businesses find out they're short on cash the week they're short on cash — by which point the only options left are expensive ones: a rushed draw on a line of credit, a delayed vendor payment, or a payroll scramble. A 13-week rolling forecast exists to move that discovery three or four weeks earlier, back to a point where there are still real options on the table.
The forecast is built week by week, not month by month — every payroll run, every large receivable, every debt payment mapped to the specific week it actually lands. Updated weekly against what actually happened, it stays a live planning tool instead of a projection that goes stale the moment the month starts.
A monthly P&L can show a profitable month and still miss a cash crunch sitting inside it — a large customer payment landing in week four instead of week two, a payroll run that falls the same week as a quarterly tax payment, a vendor who used to offer 30-day terms suddenly asking for payment on delivery. None of those show up in a monthly view. All of them show up in a weekly one, with enough lead time to actually do something about it.
What's Included
What's built into the forecast
Weekly Cash Position
Every inflow and outflow mapped to the specific week it actually hits, not the month it was invoiced.
Payroll & Fixed Obligations
Payroll, rent, debt service, and recurring vendor payments scheduled against the weeks they come due.
Draw & Distribution Planning
Owner draws and distributions modeled against what the business can actually support that week — not just what the P&L implies.
Line-of-Credit Usage
Projected draws and paydowns on a revolving line, so usage is planned rather than reactive.
Weekly Updates
The forecast is refreshed every week against actuals, so it stays a live planning tool instead of a stale projection.
Variance Review
What actually happened versus what was forecasted, reviewed so the model gets more accurate every cycle.
Who this is for
Any business with uneven cash timing — seasonal revenue, large receivables on a lag, payroll that doesn't line up neatly with collections, or a line of credit that gets drawn reactively instead of planned. It's especially valuable for construction and trades businesses, where draw schedules and retainage create cash timing that has nothing to do with when a job was actually profitable.
It's also the first thing most owners want once they've experienced a cash scare — the kind of month where payroll clears with days to spare and nobody wants to feel that again. A rolling forecast doesn't just answer "are we okay this month"; it answers "are we okay the next three months," which is the question that actually needs answering before a hiring decision, an equipment purchase, or a bid on a large job.
Cash flow forecasting is built on top of a reliable monthly close — see Outsourced Controller if that foundation isn't in place yet.
How this connects to tax
Estimated tax payments are one of the most common items that blindside a forecast — a quarterly payment that lands in the wrong week can turn a tight month into a missed payroll. Building estimated payments directly into the 13-week model, coordinated with tax planning, means they're planned for instead of discovered.
Cash Flow Forecasting Questions
Frequently Asked Questions
What owners ask before building a rolling forecast.
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