Finance.

The framework

1. 01

   Work the speed limit out from four numbers you already filed.

   The sustainable growth rate is your return on equity multiplied by the share of profit you keep — and return on equity is margin times asset turnover times leverage, the decomposition this module has already put in your hands. Take last year's net margin, divide sales by average total assets, divide average total assets by equity, multiply the three, then multiply by the fraction of profit that stayed in rather than leaving as dividends or drawings. That percentage is how fast this business can grow on its own money with nothing else changed. It takes ten minutes on paper, and almost no owner has the figure.

2. 02

   How far past the limit is next year's plan?

   Put next year's planned growth beside the sustainable rate. Growing faster isn't forbidden; it is funded. The difference has to come from one of five places — equity you dilute for, debt you service, margin you improve, assets you turn faster, or profit you stop taking out. Named in advance, it's a strategy with terms you negotiated from strength. Discovered in month nine, it's a conversation with a lender who already knows you've run out of options.

3. 03

   Growth eats cash long before it feeds you.

   Growth funds itself badly because the money leaves before it returns. Every extra sale means stock bought, people paid and work delivered now, against cash that lands on your payment terms later — so a growing business permanently carries a larger pool of working capital, and the faster it grows the larger that permanent pool becomes. This is what sits underneath the profitable company that runs out of money. It is also why the cash conversion cycle you counted on Day 36 is the most powerful dial in the whole formula: shorten it and your top speed rises without anyone's permission or a single dollar raised.

4. 04

   Take the other direction seriously: growing under the limit is a decision too.

   If your sustainable rate comfortably exceeds what you are actually growing, the business is generating cash it isn't using, and that surplus is accumulating by default rather than by choice. It has somewhere it should go: back into the business at a return you can defend, out to the owners, against the debt, or held deliberately as a buffer you have sized on purpose. Left undirected it simply sits and earns nothing while everyone congratulates themselves on being conservative — and a surplus earning nothing is a cost, just one that never appears on the P&L.