Capital, cash and fundraising · Answered by Golden Section from more than 400 B2B software companies observed
Hold enough cash to absorb a surprise churn or a customer paying months late without changing course. For most companies that means six months of operating expense at the forecast trough, or access to a line of credit or debt facility, such as Golden Section Lending, that lets you adjust the P&L and reach profitability if you have to. More than that is inefficient: cash from debt costs 15% to 20% a year, and cash from equity costs 50% or more. So measure runway to the month the company funds itself, not as a fixed count. If the forecast reaches breakeven with the reserve intact, 12 months can be plenty; if it depends on a raise, allow twice the time founders expect. Build it from a monthly cash flow forecast with collections timing in it.
Runway is enough when the monthly forecast reaches self-funding, or a closed financing, with six months of operating expense in reserve or an undrawn facility that covers the same shock. Cash beyond that should have a job, because idle equity is the most expensive money on the balance sheet. If the forecast cannot get there, cut or start raising now, while the reserve is still there to negotiate with.
| Metric | Value | What it means | Source |
|---|---|---|---|
| Operating reserve | 6 months of operating expense | cash held back at the forecast trough and never spent on the planour general runway standard, which an undrawn debt facility can stand in for | Golden Section, publishedGrowth Capital Without Heavy Dilution |
| Fundraising timeline | double your estimate | time from first meeting to cash in the bankMistake 69 on the published mistakes list | Golden Section, publishedThe B2B Software Mistakes List |
| Debt facility sizing | sized to 12 months | borrowing against what a proven motion returnswith covenants set on trailing performance and a modeled downside | Golden Section, publishedCombining Equity and Non-Dilutive Debt |
| Cost of holding excess cash | 15%–20% from debt; 50%+ from equity | annual cost of the capital that funds cash beyond the reservewhy a cushion larger than the shocks require is inefficient | Golden Section operating viewGolden Section operating view |
Runway is a forecast, not a division problem. A company with $3M in the bank and $150K of monthly burn does not have 20 months if its customers pay net-45, its payroll runs every two weeks, and half its revenue bills annually in the first quarter. The real figure comes from a cash flow forecast built with collections timing, updated monthly with actuals, and owned by the founder.
The reserve exists because forecasts are wrong in the same direction. A large customer churns without warning, another pays 60 days late, a hire costs more than planned. Six months of operating expense at the trough, or a facility such as Golden Section Lending, is what lets a bad quarter stay a bad quarter while you adjust the P&L.
The opposite error is quieter. Cash held far beyond what those shocks require is not free: debt costs 15% to 20% a year and equity 50% or more. Running short does its damage earlier, though, through discounts to pull deals forward and terms accepted to make payroll. We would rather see a founder cut early with the reserve intact, and receivables discipline is the cheapest runway most companies have.
A company at $3M in annual revenue holds $3.6M in cash with net burn of $150K a month, which reads as 24 months of runway. Its operating expense runs about $300K a month, so a six-month reserve is $1.8M. That leaves $1.8M the plan can actually spend, or 12 months at current burn, and the forecast reaches breakeven in month 15. The founder has three honest options: trim burn to about $120K a month so breakeven arrives before the reserve is touched, put an undrawn facility in place to stand in for part of the reserve, or open a financing conversation now, with 12 spendable months left rather than six. The figures are invented.
A company with committed financing in the bank, or an undrawn facility on terms it has modeled, can hold less cash, because the facility is the reserve. Seasonal verticals should size the reserve to the seasonal trough rather than an average month.
From the Golden Section mistakes list, each paired with the play that prevents it.
Runway is only real if burn and cash position are known at all times, not reconstructed when it gets tight.
A cash model left unchanged for two quarters overstates runway as reality drifts from the plan.
Founders plan runway around a raise that takes half as long as it will.
Spending against a soft investor commitment turns a financing delay into a cash crisis.
In the order we would run them. Each is on its own page, most with a free Excel template.
Produces the real runway, trough and self-funding month.
Pulls earned cash in sooner, the cheapest runway available.
Ties spending to a realistic plan so burn matches what the forecast assumed.
Keeps cash, burn and runway in front of the leadership team every week.
Executive plays Cash management sits with the founder, and the executive plays cover the forecast, budget and reporting that keep it honest.
It is enough if the forecast reaches self-funding inside those 12 months with a six-month operating reserve untouched. It is not enough if the plan depends on raising, because a raise that runs long, as most do, will leave too few months to negotiate from. In that case act on cost or financing now.
At least six months of operating expense at the lowest point in the forecast, or an undrawn facility that covers the same shock. Beyond that, cash should be assigned to a specific use, reinvested in a proven channel, or returned to shareholders; our equity model moves from building cash at 10% net profit toward regular dividends at 20%. Excess cash is expensive: 15% to 20% a year if it came from debt and 50% or more if it came from equity.
Golden Section Lending can serve as the reserve: an undrawn facility that covers a surprise churn or a late payer costs far less than holding the same cash raised as equity. Our lending starts at $1M ARR with 90%+ net revenue retention, and debt taken to cover a gap with no path to self-funding shortens runway, so we would fix the plan first.
Growth capital lending →Reviewed by Dougal Cameron, CEO & Co-Founder on 2026-09-23. Golden Section observations are labeled separately from external benchmarks and illustrative arithmetic.