Rising Yields and Micro-Cap Cash Runway: the Maths That Changes
Treasury yields entered October 2026 elevated, with the FOMC decision on 28 October still live between a hold and a further increase. For large companies that is a margin question. For companies in the $1M-$200M band it is frequently an existence question, because the cost of the next financing determines whether there is a next financing.
This is a mechanics piece: how to compute runway from filings, what the rate environment changes about it, and the three places the number usually turns out to be wrong.
The runway calculation, properly specified
The simple version — cash divided by burn — is right in structure and usually wrong in inputs. The careful version:
- Cash: cash and equivalents plus short-term investments, from the balance sheet. Exclude restricted cash; it is not available to fund operations.
- Burn: net cash used in operating activities from the cash-flow statement, averaged across the last four quarters, plus capital expenditure if the business cannot operate without it.
- Runway: cash divided by quarterly burn, expressed in quarters.
Use the cash-flow statement rather than net income. Net income contains non-cash charges that make burn look worse, and non-cash gains that make it look better. Neither pays salaries.
What a higher rate environment actually changes
Three distinct effects, and they are often confused with each other:
- Cost of new debt rises. For a company without positive operating cash flow, a credit facility is priced off a benchmark plus a spread. Both components have been moving.
- Equity financing gets more expensive in dilution terms. When rates rise, risk assets generally de-rate. A company raising the same dollar amount at a lower share price issues more shares.
- Existing floating-rate debt consumes more cash. This one shows up immediately in the interest expense line and shortens runway without any new transaction.
The third is the one you can measure today from filings. The first two are forward-looking.
Three places the runway number goes wrong
1. Restricted cash counted as available. Check the balance-sheet footnote. Cash pledged against a facility or held in escrow is not runway.
2. A one-off quarter used as the burn rate. A quarter containing a legal settlement, a milestone payment, or a working-capital swing is not representative. Average four quarters and read the largest variance.
3. Announced-but-undrawn financing counted as cash. An at-the-market facility or shelf registration is capacity, not cash. It becomes cash only when shares are sold, and selling them is the dilution.
Reading the going-concern language
When management concludes there is substantial doubt about the ability to continue as a going concern for twelve months, that assessment appears in the notes and usually in the auditor's report. It is one of the few places a company is required to state the conclusion plainly.
Its absence is weaker information than its presence. A company can have four quarters of runway and no going-concern language. The disclosure threshold is twelve months, so it is a lagging signal by construction — which is exactly why computing runway yourself is worth the ten minutes.
Putting it together
Run the calculation, then ask one question: what has to be true for this company not to need financing before its runway ends? Usually the answer is revenue growth, a milestone payment, or an asset sale — all of which are checkable against the filings.
Our cash runway calculator handles the arithmetic; the dilution calculator covers what a raise at a given price does to the share count.
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We use your email to send editorial updates. See our privacy page.Frequently asked questions
What counts as a short cash runway?
Under four quarters is generally treated as short, because a financing usually needs to be arranged a quarter or more before cash runs out. But the figure is only meaningful alongside burn trajectory and whether the company has an undrawn facility in place.
Does an ATM facility count as cash?
No. An at-the-market facility is capacity to sell shares, not cash on hand. It converts to cash only when shares are actually sold, and that sale is the dilution event. Treat it as optionality, not as a balance-sheet asset.
Why use operating cash flow rather than net income to measure burn?
Net income includes non-cash items — depreciation, stock compensation, impairments, fair-value adjustments on warrants or convertibles — that do not consume cash. Operating cash flow measures what actually left the bank.
How do rising rates affect a company with no debt?
Indirectly, through the cost of equity. Higher rates generally compress valuations for unprofitable companies, so a raise of the same size issues more shares. The balance sheet shows no interest expense, but the dilution cost of the next financing still rises.