Cash Flow Beats Profit, and It's Not Close.
Profit is an opinion. Cash is a fact. And the day debt enters your business, bought or built, the two numbers split.
My son is 27, a licensed personal trainer who genuinely loves the work and is good at it. He studied sports management, minored in entrepreneurship, and has wanted to run his own fitness venture for as long as I can remember. In the middle of 2024, the opportunity arrived: a personal training studio in Denver, for sale. $480,000 in gross revenue. $160,000 in EBITDA. A 33% margin, a growing client base, and a wall of five-star reviews.
On paper, a clean, healthy business. The add-backs looked defensible. Nothing out of the ordinary.
And that is exactly the problem
The number was honest, and it was still the wrong number to make a decision on. Not because of anything unique to buying a business, but because of something that eventually reaches every business, whether you buy one or build one from nothing.
Accrual accounting is the water we swim in. It’s how we built models in our corporate careers, how we read the earnings reports behind the stocks in our 401(k)s, how the Wall Street Journal and CNBC frame every story about every company. The P&L is the scoreboard everyone points to. EBITDA is the line everyone quotes.
For anyone running a bootstrapped business, it’s also the fastest way to misjudge your own health and run out of cash.
Profit is an opinion. Cash is a fact
And the widest gap between the two, the one nearly every founder eventually meets, is debt.
The studio's version of the gap
Start with my son's studio, because it shows the split at its cleanest.
EBITDA is, by definition, earnings before interest. The acronym says so. It describes a business as if it carried no debt at all. But my son was not going to buy this studio with no debt. The deal needed roughly a $400,000 SBA loan, carrying something on the order of $60,000 a year in debt service.
Here is the rule underneath all of it. The moment a business takes on debt that carries principal and interest, the EBITDA view and the cash view split apart. It does not matter what form the debt takes: an SBA loan, a bank term loan, a seller note, a seed loan from friends and family, a royalty deal in exchange for warrants. If it has a principal component and an interest component, EBITDA will always look healthier than the bank account, and the gap is permanent.
The reason is built into the definition. EBITDA is earnings before interest; it ignores the cost of debt on purpose. And principal repayment is not an expense at all, so it never lands on the profit statement either. But the bank account doesn’t care what your profit statement says. It withdraws principal and interest from the checking account every month, on a schedule, in cash. That’s money leaving the business that the EBITDA number simply cannot see.
Now the part that reaches everyone. Most founders reading this didn’t buy a business. They built one, from a blank page, with their own savings and their own hours. So it would be easy to read the studio story and decide it’s an acquisition problem, not yours.
It isn't. Almost no business stays debt-free for long. You take a term loan to buy equipment. You take royalty lending deal to fund growth you cannot fund from cash. The structures differ. The effect is identical. The day the first payment comes due, your EBITDA and your cash split apart, and they never rejoin.
The only difference between my son and the founder who built from scratch is timing. Buy a business, and the debt lands on day one, at the closing table. Build one, and the debt arrives later, the first time you borrow to grow or to survive. Same wall. Different mile marker. And the founder who built the business is often the more exposed of the two, because no prospectus ever forced them to look at the debt. They just felt the account get tighter and couldn’t always say why.
The second cost, also universal
Debt is the widest gap. It is not the only one, and the second is just as common.
In the studio, 40% of revenue was owner-driven. The seller did the large chunk of the sales and intakes and personally delivered a large share of the training. The add-backs credited that labor at close to nothing, because a seller adds their own compensation back to lift the number. That was defensible. It was also optimistic, because replacing a working owner at market, a senior trainer plus the sales effort, costs real cash, roughly $80,000 a year.
Here is the part that applies to you even if you never buy anything. The bootstrapped founder does the same thing to their own numbers without noticing. You work sixty-hour weeks and pay yourself little or nothing, and the P&L looks profitable. But that profit is borrowed against your own unpaid labor. Price your time at what it would cost to replace you, and the margin you were proud of thins out fast. The seller under-prices the owner's work to make the sale. The founder under-prices their own to feel successful. Same distortion, pointed inward.
Walk the number down
So take the studio's headline all the way to the bank account, and watch the shape of it, because your own bridge has the same shape.
Start at $160,000 of EBITDA. Pay two people a market wage to do what the owner did, and subtract $80,000. Then serve the $400,000 loan, roughly $60,000 a year, principal and interest together, every dollar of it cash out the door. What is left, the cash that actually lands in the account, is about $20,000.
The 33% margin on the prospectus is closer to 4% once you measure it in cash. Same business. Same honest statements. A number roughly eight times smaller.
“Nobody lied. The number was just measured before the two costs that reach every business: the debt, and the labor.”
None of this makes EBITDA useless, and it is worth saying why it exists. It strips out financing and capital structure so you can compare two businesses on their operations alone. For an analyst comparing divisions, that’s the right tool.
But EBITDA is designed to ignore how a business is financed. And for a bootstrapped operator carrying a loan, how the business is financed is the largest cash obligation they have. The metric built to look past financing is the worst one to run a business on when financing is the thing that will make or break you.
What to do with any profit number
So here is what I told my son, and what I would tell you on your own P&L, not just a buyer reading a prospectus.
The EBITDA line is a starting point, not an answer. Two questions turn it into the truth. First: what does it cost in real cash to replace the labor the owner provides, including your own? Second: what is the full debt service the business carries?
Subtract both. Build the bridge from EBITDA down to free cash, and run the business on the number at the bottom, not the number at the top. If the music stopped tomorrow, the number at the bottom is the only one that keeps the doors open.
The bridge I walked my son through is a worksheet. It takes a reported profit number and strips it down to the cash that actually converts, one honest line at a time..
The number that mattered was never the $160,000 on the cover. It was the $20,000 on the other side of the bridge. Whether you buy your business or build it, that is the only number that was ever real, and debt is what will teach it to you if you do not learn it first.
Until next week,
George
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