Quick question, and I want a real answer, not a vibe.
If every client you have stopped paying you on Wednesday, how many months could you keep the lights on?
Not “we’d figure it out.” Not “I’ve got some receivables coming.” A number. Months. With a decimal point if you’ve got one.
I’ve asked that question to a lot of operators over the years, usually over a drink, usually after they’ve just finished telling me how good the year’s been. The answer almost always comes back the same way. A pause. A half laugh. Then something like “Honestly? Six weeks. Maybe eight if I didn’t pay myself.”
That’s a business with a great tan and no health insurance.
And here’s why I’m bringing it up today, of all days. The third quarter closes this Wednesday. Thursday is Q4. And Q4 is the quarter where cash gets weird in ways that have nothing to do with how good you are at your job.
Why Q4 is where cash goes to hide
Revenue doesn’t care about the calendar. Cash does.
Here’s what happens every single year, and every single year it surprises people. Clients who paid in 21 days all summer start paying in 38, because their AP person took two weeks off at Thanksgiving and nobody covered the desk. Somewhere around December 10th, half your buyers decide they’ll “pick it back up in January.” January shows up, and they’re busy writing their own goals, so the checks you were counting on land in February. Meanwhile your rent, your payroll, your software, and your insurance don’t take the holidays off. They never have.
Layer on top of that whatever the economy is doing this month. The latest NFIB small business survey has owner optimism holding right around its long term average, which sounds fine until you read the other number. Their uncertainty index is sitting at 89 against a historical average of 68. Owners are pointing at softer sales, supply chain headaches, and prices that still won’t sit down. Translation: nobody’s panicking, and nobody’s sure.
That’s exactly the environment where a cash reserve earns its keep. Not a crash. A fog.
Profit is an opinion. Cash is a fact.
You’ve heard that line before. Most guys nod at it and keep running their business off the P&L anyway.
Your P&L tells you whether you made money. Your bank account tells you whether you’ll still be open in March. Those are two different questions, and plenty of profitable companies have gone under while answering the first one correctly.
So forget profit for the next ten minutes. We’re going to build the thing that keeps you alive when the fog rolls in. It’s a seven step build, and you can knock out the first three before lunch.
Step one: find your real monthly nut
Your nut is what it costs to exist for one month if you sold absolutely nothing.
Not your total expenses. Your survival expenses. The stuff that keeps coming even if revenue goes to zero.
Here’s what goes in:
Payroll for the people you’d keep no matter what, including payroll taxes
Rent and utilities for any space you’re locked into
Insurance of every kind
Software and subscriptions you actually need to operate
Debt payments, including equipment loans and anything on a card you’re paying down
Your own minimum draw, meaning what your household needs to not miss a mortgage payment
Here’s what stays out: cost of goods, contractor spend that scales with sales, ad spend you’d pause, commissions. Anything that shrinks when revenue shrinks isn’t part of the nut.
Now, the important part. Don’t build this from memory and don’t build it from your P&L. Pull your last three months of bank statements, the actual ones, and highlight every outgoing payment that fits the list. Add them up, divide by three.
Every man I’ve ever walked through this comes in 15 to 30 percent higher than the number he guessed. There’s always a forgotten annual renewal, a card payment that crept up, a subscription that ten people on the team use and nobody owns. The bank statement doesn’t have feelings about any of it. That’s why we use it.
Step two: calculate your runway
Runway is simple division. Cash on hand divided by your monthly nut.
The only hard part is being honest about what counts as cash on hand. Here’s the rule.
Counts: money sitting in your operating account and any reserve account, today.
Doesn’t count: receivables, even the “sure thing” ones. Your line of credit. The deal that’s closing next week. Inventory. The equipment you could sell. Your personal savings you’d “throw in if it came to that.”
If the money isn’t in an account you control this morning, it’s a hope, not a reserve.
So say your nut is $42,000 and you’ve got $95,000 in the bank. That’s 2.26 months of runway. Write it down with the decimal. The decimal matters, because “about two months” lets you round your way into feeling better, and 2.26 doesn’t.
Step three: pick your target
Here’s the scale I use. Find yourself on it.
Under one month: You’re exposed. One bad client, one late payment from a big account, one sick month, and you’re making decisions out of panic. This is priority one, above growth.
Three months: The operator floor. You can absorb a bad quarter without firing anyone or taking a deal you hate.
Six months: You sleep well. You can walk away from a bad client in the middle of a contract and not blink.
Twelve months: You make every decision from strength. You negotiate like a man who doesn’t need the deal, because you don’t.
Where you should land depends on what kind of business you run. If most of your revenue is recurring and spread across a lot of clients, three to four months is solid. If you’re project based, seasonal, or have one or two clients making up a big share of revenue, aim for six. If you’ve got a team whose rent depends on your payroll, lean higher, because your reserve isn’t only protecting you.
Pick the number. Multiply it by your nut. That’s your reserve target. For our example, six months at $42,000 is $252,000.
If that number made your stomach drop, good. It should. Now let’s get there without choking the business.
Step four: put it where you can’t see it
This is the step most guys skip, and it’s the one that matters most.
If your reserve sits in your operating account, it isn’t a reserve. It’s a balance. And balances get spent. Not on anything stupid, necessarily. On a reasonable hire, a reasonable software upgrade, a reasonable ad test. Every single one of them defensible. Every single one of them eating the fog money.
So you move it. Specifically:
Open a separate account at a different bank than your operating account. Different bank on purpose. You want friction. You don’t want it showing up in the same app you check every morning.
Make it earn something. A high yield business savings account or a treasury money market fund. You’re not trying to get rich here. You’re trying to not lose ground while it sits there.
Don’t link a debit card to it. Moving money out should require you to log in somewhere you don’t normally log in and do it on purpose.
That friction is the entire design. When you actually need the money, a two day transfer is nothing. When you want the money for something that isn’t an emergency, that two day delay is long enough for your brain to catch up with your mouth.
Step five: the sweep
Now you fill it. Not with a heroic transfer you’ll make “when things settle down.” Things never settle down. You fill it with a boring, automatic sweep.
Every week, a fixed percentage of every dollar that comes in moves to the reserve. Start at 5 percent. If that’s easy, go to 10.
Run the math on our example. Say the business brings in $80,000 a month. Five percent is $4,000 a month, or $48,000 a year. That’s more than a full month of nut added every twelve months, without a single hard decision.
Then add one rule on top, and this is where the real speed comes from. Half of any money you didn’t budget for goes straight to the reserve. The surprise client that prepaid. The tax refund. The bonus from a partner. The deal that closed bigger than quoted. Half goes to the fog fund before you’re allowed to feel rich about it.
Between the sweep and the windfall rule, most operators I’ve seen do this hit three months inside of a year, even the ones who started at zero.
Step six: open the line of credit now
Here’s a piece of banking reality nobody explains to you until it’s too late. Banks lend money to people who don’t need it.
The day you actually need a line of credit, your numbers are ugly, your revenue’s dipping, and your banker suddenly needs three more documents and a second meeting. The day you don’t need it, you’re a great customer.
So go get it this month, while Q3 numbers still look like Q3 numbers. Aim for a line roughly equal to one or two months of your nut. Then don’t touch it.
Be clear about what this is. A line of credit is not your reserve. Your reserve is your money. The line is the bank’s money, and they can shrink it, freeze it, or call it when the economy wobbles, which is exactly when you’d want it. It’s the second parachute. You still need the first one.
When you call your bank, keep it simple: “I want to put a line of credit in place as a backstop. I don’t plan to draw on it. What do you need from me?” That sentence alone tells them you’re the kind of borrower they want.
Step seven: write the break glass plan
The worst time to decide what to cut is when you have to cut something.
Your brain on six weeks of runway is not the brain you want making decisions about people’s jobs. It’s scared, it’s short term, and it’ll cut the wrong things. The fix is to make those decisions now, calm, on a Monday morning with coffee.
Write three short lists:
At three months of runway: What gets paused? Usually discretionary spend, new hires, conferences, experiments, anything “nice to have.”
At two months: What gets cut? Usually tools, contractors, your own draw drops to the household minimum.
At one month: What’s the hard call? Which roles, which offices, which lines of business, and in what order?
Put it in a doc. Date it. Share it with whoever needs to know, which might be nobody but your spouse. The point isn’t to plan for disaster. The point is that if the fog rolls in, you’re executing a plan you made as a clear thinking adult, not improvising at 2am.
Make it one number you see every Monday
Everything above falls apart if you only look at it once a quarter. The whole reason most guys don’t know their runway is that the number lives in four places and requires twenty minutes of math to see.
So collapse it into one number that shows up on its own.
I set this up with Make. Every Monday at 7am, a scenario pulls the balances from the operating account and the reserve account through my accounting software, divides by the nut I hardcoded, and texts me one line: “Runway: 4.3 months. Reserve: 71% of target.” That’s it. No dashboard to open, no spreadsheet to update.
Seeing that number every Monday does something weird to your behavior. When it ticks up, you feel it. When it ticks down, you ask why before it becomes a problem. It’s the cheapest financial advisor you’ll ever hire, and it never sends you a bill for the meeting.
If you don’t want to build the automation, fine. Put a fifteen minute recurring block on Monday mornings and do the math by hand. The tool doesn’t matter. The rhythm does.
The objections
“I’d rather put that money into growth.”
Growth is great. Growth with no reserve means one bad quarter forces you to undo the growth, usually by letting go of the people you just hired. A reserve isn’t the opposite of growth. It’s what lets you keep the growth you already bought.
“My clients are solid.”
They are, right up until one of them gets acquired, loses a big account of their own, or brings in a new CFO whose first move is renegotiating every vendor. Solid clients are the ones you don’t see coming. That’s the point.
“That money’s just sitting there doing nothing.”
It’s doing the most important job in your business. It’s buying you the ability to say no. No to the client who’s treating your team badly. No to the lowball deal in a slow month. No to the partner who wants terms you hate. Every one of those no’s is worth more than the yield you’d get anywhere else.
“I’ll start after Q4.”
Q4 is exactly when you’ll wish you’d started. You don’t build a reserve in the fog. You build it before.
What this actually buys you
I’ll tell you what changed for me once I crossed six months. It wasn’t the money. The money mostly just sat there.
It was the posture. I stopped taking calls from a place of need. I raised prices and didn’t lose a minute of sleep over it. I fired a client who was making my best guy miserable, mid contract, and it cost me nothing but a slightly smaller month. I started sleeping through the night in December, which, if you’ve ever run a business through a holiday season, you know is not a small thing.
A reserve is the difference between running your business and your business running you. It’s the most boring thing I’ll ever tell you to do, and it might be the one you thank me for.
Today’s move
Three things, before the day gets away from you:
Pull three months of bank statements and calculate your real nut. Highlighter, calculator, no guessing.
Divide your cash by it. Write your runway down with the decimal point. Tape it somewhere you’ll see it.
Open the separate reserve account this week and set up the 5 percent weekly sweep before Q4 starts on Thursday.
That’s maybe an hour of work. It’ll be the most valuable hour you spend this quarter, and you’ll never see it on a P&L.
WANT THE WHOLE BUILD ON ONE PAGE?
Reply to this email with the word RESERVE and I’ll send you The Reserve Builder. It has the monthly nut worksheet with every line item, the runway calculator with the formula boxes filled in, the target tiers by business type, a 52 week sweep schedule, the break glass plan template ready to fill in, and the exact script for the line of credit conversation with your banker.
It’s a working document. Print it, fill it in, and know your number by Friday.
Wednesday, we’re talking about the other reserve you’re about to burn through in Q4. It’s not in your bank account.
Refined. Relentless. Unapologetic.
Marcus

