Cash Flow Profitability

Most financial planning in a small business assumes a version of "more or less like last year, maybe a bit better." Almost none of it asks the one question that actually determines whether a business survives a genuinely bad stretch: what happens if new sales simply stopped for six months?

This question tends to make founders uncomfortable, which is exactly why it's worth asking deliberately rather than waiting for circumstances to force it. A business plan built entirely around the expected case, with no version of the bad case ever modelled, isn't a complete plan — it's an optimistic one.

Why this specific test

A slowdown, a lost anchor client, a market shock, a regulatory disruption — the causes vary, but the effect on cash is the same: revenue drops sharply while most fixed costs don't move at all. Rent, salaries, loan EMIs, and existing vendor commitments keep coming due regardless of what's happening on the sales side. The businesses that survive this scenario aren't the ones with the best growth story. They're the ones that knew this number in advance.

How to actually run it

• List every fixed cost that continues regardless of sales. Rent, payroll, loan EMIs, insurance, subscriptions, and any vendor contract with a minimum commitment.
• Calculate the monthly burn under a zero-new-sales scenario. Total fixed costs, minus any cash still collectible from existing receivables in the pipeline.
• Compare that monthly burn to current cash reserves. Divide reserves by monthly burn to get your actual survival window, in months.
• Re-run it at a more realistic 50% sales decline, not just zero. A total stop is rare; a sharp partial decline is common, and the math changes the answer meaningfully.

This exercise usually takes half a day and produces a number founders remember for years afterward, mostly because it's rarely as comfortable as they expected going in. Even businesses that consider themselves financially conservative are often surprised by how quickly a true zero-sales scenario would draw down their reserves.

What most founders discover when they run it

The most common surprise isn't that the buffer is thin — most founders have a rough sense that it's not huge. It's how much of the assumed "fixed cost" turns out to be more flexible than expected, and how much turns out to be less flexible. A discretionary marketing budget can usually be cut within a month. A long-term lease or a loan EMI cannot, and those are exactly the obligations that keep running hardest during a genuine slowdown.

What a comfortable number looks like

A commonly used rule of thumb is three to six months of fixed costs held as a cash buffer — enough to absorb a genuinely bad stretch without a rushed loan or a fire-sale decision. Fewer than three months of buffer means a single delayed customer payment or one lost contract can turn a manageable slowdown into an existential one.

The value isn't the number. It's knowing it in advance.

Businesses that have run this test aren't necessarily in a stronger cash position than those that haven't — but they're never caught by surprise, because they already know exactly how much runway a bad quarter would leave them, and they've had time to build a buffer or a contingency plan before it was needed under pressure.

If you've never run this test for your own business, it takes about half a day with your actual numbers — and it's usually the single most clarifying exercise a founder can do before, not during, a downturn.