$40 Trillion Debt: The Cost-of-Capital Reset Founders Need

Sometime in the next few weeks, the U.S. national debt will cross $40 trillion. As of early August it stood at $39.83 trillion, growing at roughly $7.9 billion a day, with the Joint Economic Committee projecting the crossing around late August or early September (Traders Union, Mitrade). Wednesday's 10-year Treasury auction cleared at 4.683% — the highest auction yield since 2007 (Bloomberg, Reuters via LSE). Today's 30-year sale is expected to price at the highest financing rate in a quarter of a century (Bloomberg).

Interest on the debt has already crossed $1 trillion annually and now runs at roughly $3.18 billion per day, exceeding what the country spends on defense (Fortune, Yahoo Finance).

If you are running a $5M–$50M company and your financial model still uses the cost-of-capital assumptions you built in 2019, 2020, or even 2022, you are not planning. You are guessing — with someone else's math.

The Regime Has Actually Changed

For a decade, the working assumption inside most mid-market finance functions was that rates were an anomaly. Cheap money would return. The 10-year would drift back toward 2%. Discount rates in the model could sit where they had sat since the financial crisis.

That premise is dead. The 10-year yield has now been above 4% for most of the last three years and closed yesterday at 4.70% (FRED). The last time it was here, on a sustained basis, was before the financial crisis (Reuters via LSE).

Bain's private-equity team has been blunt about what this does to deal math. Their 2026 midyear report puts it as a bumper sticker: "12 is the new 5." A leveraged deal that used to require 5% annual EBITDA growth to generate a 2.5x return over five years now requires 12% — because multiple expansion has been taken off the table by the cost of debt (Bain & Company).

That reality doesn't stay in PE. It shows up on your term sheet, in your buyer's discount rate, and in the hurdle your own capital projects have to clear.

The Founder's Model Is Almost Always Wrong

There is a specific finding I show every founder client. Morgan Stanley's Counterpoint Global research found that roughly 80% of companies use hurdle rates that are substantially disconnected from their actual cost of capital — often five or more percentage points above their real WACC (Forbes Councils).

In the low-rate era, that conservatism meant passing on projects that would have created value. In 2026, it means something more dangerous: many mid-market models are now accidentally aligned with — or even below — the true cost of capital. Projects that used to look "safe" don't clear the hurdle anymore. Projects that got rejected two years ago may quietly look viable, but nobody has re-run the math to notice.

PwC frames the same problem from the CFO's chair: capital allocation has moved "from planning cycle to decision engine." Slow, annual capital-strategy exercises are outmoded when rates, private credit conditions, and balance-sheet trade-offs move on a weekly clock (PwC).

I Have Run This Play Before — And I Have Paid for It

I know this environment because I have financed and sold a company through the last one — and because the exit did not go the way we drew it up.

2008. We made an acquisition and financed it with $20 million of mezzanine debt. Pre-Lehman, middle-market mezz was pricing at 12–16% all-in (K&L Gates). After Lehman, that repriced to 14–19% all-in, typically structured as a 12% cash coupon plus 2–3% PIK (BGL State of Middle-Market Financing, Oct 2008). We signed into the teeth of that repricing. Mid-teens all-in, cash coupon plus PIK, with an equity kicker — the standard structure of the day.

The first lesson from 2008 was not that expensive capital is unsurvivable. It was that expensive capital is only survivable if the operating model actually clears the rate you are paying. Every assumption had to be stress-tested against the coupon we had signed for, not the one we wished we had signed for. Working capital discipline, pricing power, and cash conversion stopped being finance-team abstractions and became the reason the company kept the lights on. The founders who survived 2008 did not do it by hoping rates would fall. They did it by building models that worked at the rate they were paying.

2012. Four years later, we ran a sale process through Allen & Co. And here is where the second lesson landed — the harder one.

We could not sell the business as a single company. The buyer universe simply would not price it that way. The strategics who wanted the technology did not want to underwrite a services business. The buyers who wanted the services business did not want to pay for the technology. So we bifurcated. We separated the company into a services business and a technology business and ran two sale tracks to two different buyers.

The deals closed. But that is not the same as a clean exit, and I have never pretended otherwise. A bifurcation costs you optionality, deal certainty, and — almost always — aggregate value. It is the outcome you get when the equity story you built does not survive contact with the buyer's discount rate. Two smaller buyer universes at two lower multiples is what happens when the market decides the story on your behalf.

The lesson I took out of that process is the one I now hand every founder client who is thinking about a transaction inside 24 months: the buyer prices off their cost of capital, not yours — and if your equity story does not hold up against that cost of capital, the market will restructure your company for you. Sometimes that restructuring is a lower multiple. Sometimes it is a bifurcation. Sometimes it is no deal at all. None of those outcomes are the one you want.

The 2026 environment is not 2008, and it is not 2012. But the pattern is the same. If a buyer's WACC has moved from 8% to 11% — which is exactly what has happened across most of the mid-market in the last three years — a company generating $8M of EBITDA is worth materially less at the same multiple, unless the seller can prove that the cash flows justify a compression of the discount rate. And if the story does not hold together, the buyer universe will fragment on you.

That is the single most expensive mistake I see founders making in a transaction environment like this one — and, unlike the mistakes I made in 2012, it is entirely fixable before the process starts.

The Structural Thesis in One Paragraph

Here is the thesis stripped to a paragraph. The federal government's borrowing needs are structurally higher and will keep pulling long-end yields up. The 10-year Treasury — the risk-free rate feeding every WACC model in the country — has reset roughly 200 basis points higher than the 2010s baseline (FMP). That reset flows through cost of debt, cost of equity, hurdle rates, EBITDA multiples, and covenant math. Any founder still planning off a pre-2022 cost of capital is running a model that overstates project NPVs, overstates enterprise value, and understates refinancing risk. "Lower for longer" is not coming back inside a planning horizon that matters.

The 90-Day Playbook

This is the tactical layer. If your fiscal year ends December 31, you have roughly 90 days before the 2027 plan is committed. Do these five things, in this order.

1. Recalibrate the hurdle rate

If your investment hurdle has not been formally reviewed in the last 18 months, it is wrong. Benchmark against your actual WACC using the current 10-year yield as the risk-free proxy. Layer in a project-specific risk premium — do not hold AI or digital investments to the same hurdle as a mature product line (Forbes Councils). Run the new hurdle against every project in the capex pipeline. Some previously rejected projects will now look viable. Some previously approved ones will not. That is the point.

2. Triage the capex pipeline in three buckets

Adapt the standard consulting framework — Bain, PwC, and AT Kearney all use variants of it — to your project list:

• Protect (return > WACC + 3%). Fund fully. These are your durable competitive advantages.

• Pause / rescope (return ~ WACC). Can it be made capital-light? Phased? Modular? A factory or systems build redesigned as pay-as-you-grow is often the answer.

• Terminate (return < WACC). Zombie projects. Kill them. In a low-rate era they were tolerable. In this one they are actively value-destructive.

The instinct is to cut R&D and marketing first because they look discretionary. That is usually the wrong cut — you are sacrificing future compounding to save short-term cash (MyEyze).

3. Extend maturities and fix floating-rate exposure

Every fractional CFO I know is doing a version of the same conversation with clients right now: pull the schedule of every debt instrument, sort by maturity, and identify what is refinancing inside the next 24 months. For anything floating-rate, model a rate-shock scenario at 100 and 200 basis points higher. If the interest-coverage ratio breaks, you have a treasury problem to fix now, not a story to tell the bank later (PwC Global Treasury Survey).

Extending maturities at today's rates hurts. Refinancing under duress hurts more.

4. Retire debt as an "investment"

In this rate environment, paying down high-cost debt is often the highest risk-adjusted return available to a mid-market company. Every dollar of 9% debt retired is a guaranteed 9% pre-tax return — better than most of what is sitting in the capex pipeline. Buybacks and speculative growth spend should be measured against this benchmark, not against zero (Forbes Councils).

5. Rewrite the equity story before the transaction, not during it

If a sale, recap, or capital raise is anywhere on the 24-month horizon, the equity story needs to be rewritten now with a modern cost-of-capital lens. That means:

• A three-year plan whose growth assumptions justify the discount rate a buyer will actually use.

• KPIs that translate directly into the buyer's underwriting model.

• Working-capital metrics that show discipline — DSO, DIO, and cash conversion are the levers that free capital without borrowing at 9%.

• A treasury posture that a buyer's diligence team cannot pick apart.

Bain's resilience framework calls this "recrafting the equity story to demonstrate how the new actions maximize shareholder value through the cycle" (Bain & Company). In a mid-market transaction, that recrafting is the difference between a defensible valuation and a discount.

The Real Question

The debt clock hitting $40 trillion is a headline. The real story is what it signals: a structurally higher cost of capital that most mid-market planning models have not yet absorbed.

The founders who spend Q4 rebuilding their assumptions against that reality will enter 2027 with a plan that survives contact with a buyer, a lender, or a board. The ones who don't will spend 2027 explaining to those same audiences why their model still assumes a world that ended three years ago.

The math is unforgiving. But it is also entirely knowable — and there are 90 days to get it right.

John Mortenson is the founder of Straiteis Consulting LLC, a fractional C-suite advisory firm. He has served as CFO, COO, and CEO across private, public, and PE-backed technology-enabled services companies, financed acquisitions through the 2008 credit crisis, and led a subsequent Allen & Co. sale process that bifurcated the business into separate technology and services transactions. Over his career he has raised more than $500M across Series A, mezzanine, asset-based, and public capital. To discuss whether a fractional engagement is right for your company, visit johnmortenson.com.