Runway Mistakes to Avoid:Nine Ways to Misread Your Clock

The runway mistakes to avoid are nine, and none is arithmetic. They are failures of definition and timing: undefined numbers, money counted early, last month as the burn rate, hopeful pipeline, ignored planned burn, waiting, cutting big, ignoring good news, and hiding the number.

Runway mistakes to avoid, and why they are all fixable

These end businesses that had the information to avoid them.

That's the uncomfortable part. Nobody ran out of money because the sum was too hard. They ran out because they quoted a number nobody had defined, or counted something that hadn't arrived, or waited a month because the week was bad.

Here's the good news. All nine are available to fix this week. None needs a finance background. None needs anyone's permission.

Read these runway mistakes as a diagnosis. Most solo operators will recognise at least three.

The first three: what you count

One. Quoting a number nobody has defined. Gross or net. Cash or accounting profit. Which window. Whose plan. Two correct numbers that disagree leave you trusting neither and steering by neither. The cure is boring. Write one sentence that settles every qualifier, then use it every single time. The full set of definitions is in what is business runway.

Two. Counting money that has not arrived. Committed, invoiced, awarded and promised are all ways of saying "not yet in the bank". An undrawn credit line is an option with conditions, and the conditions tighten exactly when you need it. Keep a separate line for near-certain money with expected dates. Never let it merge into the balance. Everyone who has been surprised by their own runway made this merge somewhere.

Three. Using last month as the burn rate. One month is noise. An annual insurance payment, a tax bill or one large receipt will hand you a number wrong by months, in either direction. Use a trailing three-month average, and put known lumps on the calendar in the month they land.

Notice the pattern so far. Each mistake takes a number that feels solid and quietly makes it a guess. The fix, every time, is a definition written down before the number is quoted.

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The next two: what you assume

Four. Baking optimistic pipeline into the base case. This one is nearly always self-inflicted, and nearly always invisible to the person who did it, because they built it on a good day. Split revenue into contracted, probable and hoped. Steer by the first two. Keep the third visible as a separate upside, so you can see what it would do without letting it fund a decision. The detail is in how to forecast income for runway.

Five. Never calculating planned burn. Current burn is the comfortable number. The plan is the real one. If you steer by current burn, you are steering by a number you have already decided not to follow. Planned burn includes what you intend to commit to. It's always shorter. When the two diverge sharply, you haven't made a plan, you've made a wish with a shopping list attached.

Those two share a root. Both let hope write the base case. And hope is the one input a model should never accept without evidence.

The next two: what you do

Six. Waiting one more month before you start. This is the most expensive habit of the nine. Leverage falls as runway falls, and the moment will never feel convenient. You will always have a reason: a deal in progress, a launch coming, a hard quarter. The reasons are real. They're also the reasons the line was drawn in advance. Set your trigger while calm, and see how to set runway alert thresholds.

Seven. Cutting the biggest thing first. It looks decisive. It is the most damaging, least reversible lever. Unused spend and unchased money routinely produce months at almost no cost, and almost nobody works that order. If you only learn one thing from this list, make it that the cheapest lever is almost never the one that feels brave.

Waiting and cutting big are the same failure wearing different clothes. One does nothing for too long. The other does too much, too fast, in the wrong place. Both come from not deciding earlier.

The last two: what you look at, and who sees it

Eight. Only investigating bad news. A drop demands attention, so it gets it. A rise feels like a reward, so it gets none. But an improvement that is actually a deferral comforts you for exactly as long as it takes to arrive anyway, in a worse month. Ask "why" in both directions. Always.

Nine. Hiding the number. If anyone else is involved, a collaborator, a contractor, a partner, they make decisions without knowing the constraint, and then they're blindsided. People forgive a hard number far more readily than discovering one was concealed. Share it together with the plan.

Eight and nine are about honesty. First with yourself, then with others. Both are free.

Which of the nine runway mistakes is yours?

Be honest. You probably have a favourite.

Some people are optimists: they commit early, count what's coming, and wait. For them it's two, four and six. Others are anxious: they cut too fast and hide the number. That's seven and nine. A third group is simply busy, and for them it's one, three and five, because nobody has had the afternoon to define things.

Knowing your type tells you where to look first. If you tend to hope, audit your forecast. If you tend to panic, write the extension order down while you are calm, as set out in how to extend your runway. If you tend to be busy, block one afternoon and do the definitions.

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Why capable people still make runway mistakes

You'd think experience would protect you. It doesn't, because the mistakes aren't about knowledge. They're about mood.

A good month makes you generous with the forecast. A bad month makes you want to do something dramatic. A busy month makes you skip the review. A frightening month makes you keep quiet. Every one of the nine is a way of letting how you feel set a number that should be set by a rule.

That is why the fixes are all the same shape. A definition written down. A line drawn in advance. A date in the calendar. A second person who knows. Each one takes your mood out of the loop.

And it's why running alone makes this harder, not easier. In a team, someone else will eventually ask the awkward question. When you work solo, the awkward question only gets asked if you build it into the system. Your own review is the only colleague you've got, so give it a fixed day and real teeth, as described in how to review runway monthly.

The cost of getting it wrong

It's rarely a sudden collapse. That's the myth.

The usual failure is slower and quieter: you discover, four months later than you should have, that you were going to run short. By then every remaining option is worse than the ones you had. The cheap levers have gone. The calm conversations are now urgent ones. Whoever you might have asked for money, or a favour, or time, can see the clock as clearly as you can.

A wrong runway number is worse than no number at all. No number produces caution. A wrong number produces confident action in the wrong direction: spending against months you don't have, or starving something that was working against months you do.

That's the reason to fix the definitions first and the cleverness later.

Free guide · 23 pagesKnow how long you actually have.The Runway Playbook: the number that sets every other deadline, and how to stop finding out late.Get the free guide →

What to do this week

1. Write your one-sentence runway definition and use it from now on.
2. Check that nothing in your balance is money that hasn't arrived.
3. Calculate planned burn next to current burn and look at the gap.
4. Pick your trigger and tell someone.
5. Book a thirty-minute slot, same day each month, and put the first one in the calendar.

Fixing runway mistakes takes an afternoon and a calendar entry. Compare that with the cost of finding out four months late.

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Frequently asked questions

What is the most common runway mistake?

Quoting a number nobody has defined. Gross or net, cash or accounting profit, which window, whose plan. Two correct numbers that disagree leave you steering by neither. Write one definition and use it every time.

What is the most expensive runway mistake?

Waiting one more month before acting. Leverage falls as runway falls, and the moment never feels convenient. Setting a trigger in advance, and telling someone, is the cure.

Are runway mistakes about maths or judgement?

Neither, mostly. They are failures of definition and timing, not arithmetic. That is why they are fixable this week: you only need to decide what you are counting and when you will act.

Should I worry if my runway number improves?

Examine it as carefully as you would a drop. It may be a genuine improvement, a payment that slipped into next month, or a cost that was deferred rather than removed.

The full method, with the checklists, is in The Runway Playbook, a free 23-page playbook.