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【A Must-Read for Startups】Your Runway Is Probably Three Months Shorter Than You Think
- 13 hours ago
- 4 min read
"We still have 11 months of runway."
We've heard this many times.
Our next step is usually to ask three questions.
After those three questions, that "11 months" often becomes seven months.
It's not that founders are trying to mislead anyone. The calculation itself is inherently optimistic.
In March 2026, CB Insights analyzed 431 venture-backed companies that have shut down since 2023. The number one reason for failure was running out of cash, accounting for 70% of all cases.
But running out of cash has never been the cause—it's the result.
The real problem is usually that companies realize it too late.
I. Three Things That Fool You
Most founders calculate runway using a simple formula:
Cash on hand ÷ Average monthly burn rate.
The problem is that this formula can mislead you in three different ways—and all of them point in the same direction: making you believe you have more time than you actually do.
Illusion 1: You're Using an Average, But Expenses Don't Happen on Average
Over the past six months, your company burned an average of US$100K per month.
Sounds stable.
But next quarter, you'll need to pay your annual cloud services contract, year-end bonuses, a one-time cybersecurity certification fee, and salaries for two new hires who have already accepted your offers.
An average looks backward.
Runway looks forward.
Using historical averages to predict future cash consumption is fundamentally a mismatch.
Illusion 2: You're Counting Money That Isn't Really Yours
Your company has US$1 million in the bank.
But US$200K of it comes from customers who prepaid annual subscriptions.
From an accounting perspective, that's deferred revenue—a liability, not cash you can freely deploy. You've already committed to delivering the next 12 months of service in exchange for it.
The same applies to:
Restricted government grants
Pass-through funds collected on behalf of others
Security deposits that haven't yet been refunded
The money may be sitting in your bank account.
It doesn't belong in your runway.
Illusion 3: You're Treating One-Time Revenue as Recurring Revenue
Last quarter, you closed a custom project worth US$130K.
It made that month's net burn rate look much healthier.
So it became part of your average—and part of your runway calculation.
But that revenue won't come back next year.
One-time revenue makes your runway look longer while simultaneously making your growth look more sustainable than it really is.
That's what makes it so costly.
II. Two Checks You Can Do Tonight
You don't need to build a full financial model.
Two simple checks are enough.
Check 1: List Every Expense You've Already Committed to Over the Next Six Months
Not forecasts.
Only commitments that already exist.
Include:
Salaries (including people who have already accepted offers)
Year-end bonuses
Office leases
Annual software subscriptions
Taxes
Marketing budgets that have already been contracted
Add them all together.
Then compare the total against the cash you can actually use.
For most startups, this exercise alone shortens their runway by one to three months.
Check 2: Assume You Close Zero New Deals Over the Next Three Months
This isn't pessimism.
It's a stress test.
Remove every projected revenue stream that hasn't been signed yet.
Keep only contracted recurring revenue.
Then recalculate the day your cash balance reaches zero.
That's the date you should actually be counting down to.
III. Why Three Months Matter
Because fundraising takes time.
From our experience, it's entirely normal for a fundraising round to take six to nine months from kickoff to money hitting your bank account.
In a tougher funding environment, it usually takes even longer.
If your real runway is seven months, you're not thinking,
"We still have seven months to push for growth."
You're thinking,
"We should already be fundraising."
It gets even more difficult when your runway drops below six months.
Investors can immediately see the pressure you're under.
Your negotiating position weakens.
Terms become less favorable.
Valuations decline.
Ironically, the fundraising process often becomes even slower.
That's why getting your runway wrong by three months doesn't just cost you three months.
It costs you leverage.
Three Questions Every Founder Should Ask
After excluding customer prepayments and restricted funds, how much cash can you actually use freely?
If you close zero new deals over the next three months, when will your cash run out? Can you state that exact date?
When are you planning to raise your next round? If you count backward six to nine months from that date, are you already running late?
Conclusion: Runway Isn't a Number—It's a Set of Assumptions
The number of months you calculate is built on a whole set of assumptions:
Revenue will arrive according to plan.
Expenses will occur evenly.
Customer prepayments can be used freely.
If any one of these assumptions turns out to be wrong, your runway immediately becomes shorter.
Real financial discipline isn't about making your runway look longer.
It's about knowing under what conditions it becomes shorter.
You're calculating based on the average of the past.
Investors are looking at the day your cash runs out in the future.
Follow us for more insights:
• LinkedIn: https://www.linkedin.com/company/ventureplusco
About VENTURE+
VENTURE+ specializes in SaaS and AI investments, offering more than just funding. We provide startups with strategic guidance, corporate partnerships, and capital market planning. We aim to be the "Best Co-Founding Partner" bridging startups, venture capital, and industry leaders in long-term collaboration.
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