Intrinsic Value, Part 6: Risk and the Discount Rate
Future cash flows are worth less than cash in hand. The question is: how much less? The answer depends on risk.
In Part 2, we established that a dollar today is worth more than a dollar in the future — because today’s dollar can be invested and grow. When we value a business, we take its projected future cash flows and “discount” each one back to its present value. The rate we use to do that is called the discount rate.
In Part 5, we derived Maple Ridge Manufacturing’s growth rate: 3.3% per year, based on how much the business reinvests and what it earns on those investments. We now have five years of projected cash flows. Before we can add them up and produce an intrinsic value, we need one more number: the discount rate.
For companies like Maple Ridge — non-financial businesses — the discount rate we use is called WACC, which stands for Weighted Average Cost of Capital. It’s the blended rate that represents what all of Maple Ridge’s investors — both shareholders and lenders — require as a return for putting their money at risk in this specific business.
Let’s build it from scratch.
Why the Discount Rate Reflects Risk
Here’s the intuition.
Imagine two promises: someone reliable promises to pay you $1,000 in five years, and someone unreliable makes the same promise. Which promise would you pay more for today?
The reliable one, obviously. You’d demand a discount on the unreliable promise — meaning you’d pay less for it today — to compensate for the chance it doesn’t come through. In finance, that “less” is captured by using a higher discount rate: a higher rate shrinks the present value of future cash flows, mechanically reflecting the fact that you’re less certain of receiving them.
The same logic applies to companies. A utility company that delivers electricity to a captive customer base has highly predictable cash flows — low risk. A startup in a volatile market has highly uncertain cash flows — high risk. The startup deserves a higher discount rate, which makes its future cash flows worth less today.
WACC captures this. A riskier business will have a higher WACC, which shrinks the present values and produces a lower intrinsic value. That is not a quirk of the formula — it is the mathematically precise expression of the real economic fact that risk has a cost.
The Two Pieces of WACC
WACC is a weighted average because most businesses are funded by two types of capital: equity (money from shareholders) and debt (money from lenders). Each type has its own cost, and WACC blends them together based on how much of each the company uses.
WACC = (Cost of Debt × Weight of Debt) + (Cost of Equity × Weight of Equity)
Let’s define each piece.
Cost of Equity: What Shareholders Require
Cost of Equity is the return that equity investors — shareholders — require for owning this company’s stock. Unlike lenders, shareholders have no guaranteed return. They get paid last, only after employees, suppliers, tax authorities, and lenders. To compensate for that extra risk, they demand a higher return.
We calculate Cost of Equity using a model called the Capital Asset Pricing Model, or CAPM. The formula is:
Cost of Equity = Risk-Free Rate + (Beta × Equity Risk Premium)
Three terms to define:
Risk-Free Rate is the return you could earn with essentially zero risk — the yield on a 10-year U.S. Treasury bond. Because the U.S. government has never defaulted on its debt, this is as close to a guaranteed return as exists in finance. It’s the floor below which no rational investor would accept a return, because you can always earn this rate for free by lending to the government.
As of early 2026, the 10-year Treasury yield is approximately 4.25%.
Equity Risk Premium (ERP) is the extra return investors demand for investing in stocks rather than Treasury bonds. The stock market is riskier than government bonds — prices fluctuate, companies can go bankrupt, dividends can be cut. To accept that risk, investors require a premium over the risk-free rate. This premium is estimated by financial economists and updated regularly. We use a figure derived by Professor Aswath Damodaran at NYU, a widely respected estimate: approximately 4.72%.
Beta measures how much this specific company’s stock moves relative to the market. A beta of 1.0 means the stock tends to move in lockstep with the overall market. A beta above 1.0 means it’s more volatile than the market (amplifies market swings). A beta below 1.0 means it’s less volatile (cushions market swings). We use the industry beta — an average beta for the industry the company operates in — rather than the individual stock’s historical beta, which can be noisy.
Maple Ridge Cost of Equity:
Maple Ridge operates in industrial manufacturing — a moderately cyclical industry but not an especially risky one. Its industry beta is 0.85: slightly less volatile than the overall market.
Cost of Equity = 4.25% + (0.85 × 4.72%)
= 4.25% + 4.01%
= 8.26% (call it 8.3%)
Maple Ridge’s equity investors require approximately an 8.3% annual return to own this stock. If the stock doesn’t clear that hurdle over time, rational investors will sell and deploy their capital elsewhere.
Cost of Debt: What Lenders Charge
Cost of Debt is the interest rate Maple Ridge pays on its borrowings — bonds, loans, lines of credit. Unlike equity, debt has a contractual return: the interest rate. Lenders know what they’ll receive as long as the company doesn’t default.
We estimate the interest rate from the company’s interest coverage ratio — how many times over the company’s operating profit covers its annual interest payments. A company that earns $50 million in operating profit and pays $2.5 million in annual interest has an interest coverage ratio of 20x. That’s very comfortable — the company could have its profits fall dramatically and still service its debt. Lenders see this as low-risk and charge a correspondingly small default spread above the risk-free rate.
A company barely covering its interest payments has a low coverage ratio. Lenders demand a much larger spread to compensate for the higher risk of default.
So how does a coverage ratio become a spread? Through a lookup table. Financial economists — most notably Professor Aswath Damodaran at NYU — publish tables that map interest coverage ratios to synthetic credit ratings. A credit rating (like AAA, BBB, or CCC) is the bond market’s shorthand for how likely a borrower is to repay its debt. The higher the rating, the lower the risk, and the lower the spread lenders demand.
The table works like this: a company with a coverage ratio above 8.5x typically earns a synthetic rating of Aaa/AAA — the highest possible. Lenders are so confident of repayment that they charge only a small premium above the risk-free rate, around 0.4%. A company with a coverage ratio of 2.0x to 2.5x might earn a Ba2/BB rating — speculative grade — and lenders demand a spread of 2.5% or more to compensate for the real chance of default. Below 0.5x coverage, the rating falls to Caa/CCC and the spread exceeds 10%.
In practice, if a company’s bonds are publicly traded, you can read the spread directly from market prices. For private companies — or as a cross-check — you use the synthetic rating table.
Interest Coverage Ratio = EBIT ÷ Annual Interest Expense
Pre-Tax Cost of Debt = Risk-Free Rate + Default Spread
After-Tax Cost of Debt = Pre-Tax Cost of Debt × (1 − Tax Rate)
We use the after-tax cost because interest payments are tax-deductible. If a company pays $1 million in interest but is in the 25% tax bracket, the government effectively subsidizes $250,000 of it — the true cost to the business is $750,000. The after-tax formula captures this.
Maple Ridge Cost of Debt:
EBIT = $50.0M
Annual Interest Expense = $2.5M
Interest Coverage = $50.0M ÷ $2.5M = 20x
With 20x coverage, Maple Ridge carries nearly zero default risk. Its default spread is approximately 0.4%.
Pre-Tax Cost of Debt = 4.25% + 0.40% = 4.65%
After-Tax Cost of Debt = 4.65% × (1 − 0.25) = 3.49% (call it 3.5%)
Maple Ridge’s lenders are charging the company an effective 3.5% for its debt — cheap, because the company is financially rock-solid.
Capital Weights: How Much Equity vs. Debt?
WACC is a weighted average. We need to know what fraction of Maple Ridge’s total capital comes from equity and what fraction comes from debt.
We measure equity at market value — the total market capitalization of the company’s shares outstanding (the number of shares multiplied by the current stock price). We use market cap rather than book equity because market cap is what shareholders have actually committed to the business at today’s prices.
We measure debt at book value — the face value of the company’s outstanding loans and bonds, as reported on the balance sheet.
Total Capital = Market Cap + Book Value of Debt
Weight of Debt = Book Debt ÷ Total Capital
Weight of Equity = Market Cap ÷ Total Capital
Maple Ridge Capital Weights:
Share Price = $42
Shares Outstanding = 10 million
Market Cap = $420M
Total Debt (from Part 5) = $45M
Total Capital = $420M + $45M = $465M
Weight of Equity = $420M ÷ $465M = 90.3%
Weight of Debt = $45M ÷ $465M = 9.7%
Maple Ridge is funded almost entirely by equity. Shareholders own 90% of the capital structure. Lenders hold the remaining 10%. That’s a conservatively financed company — it relies very little on borrowed money.
Assembling WACC
Now we put it together:
WACC = (After-Tax CoD × Weight of Debt) + (Cost of Equity × Weight of Equity)
= (3.5% × 9.7%) + (8.3% × 90.3%)
= 0.34% + 7.49%
= 7.83% (call it 7.8%)
Maple Ridge’s WACC is 7.8%. That’s the blended rate we’ll use to discount each year’s projected free cash flow back to its present value today.
What WACC Tells You About Value Creation
WACC has one more use beyond discounting. In Part 5, we calculated that Maple Ridge earns a 25% return on invested capital.
ROIC − WACC = 25% − 7.8% = 17.2%
Any business that earns a return higher than its cost of capital is creating value — it’s generating more from its investments than those investments cost. Maple Ridge earns 17.2 percentage points above its cost of capital every year. That’s a durable wealth-creating machine.
A business where ROIC equals WACC is breaking even on its investments. A business where ROIC falls below WACC is destroying value — it would be better off returning capital to investors rather than reinvesting it.
A Note on Risk and What It Does to Value
Now that you’ve seen all the pieces, it’s worth pausing to observe what a higher discount rate does.
Take the same set of future cash flows — exactly the same projected amounts for years one through five. Now raise the discount rate from 8% to 12%. Each future cash flow gets divided by a larger number. The present values fall. The intrinsic value is lower.
That’s not arbitrary math. It reflects something real: a riskier business — one with more volatile earnings, more leverage, more competitive uncertainty — is genuinely worth less today than a safer business generating the same cash flows. You’d pay more for a reliable promise than an uncertain one, even if both claim the same dollar amount.
The discount rate is the mechanism that makes that intuition precise.
Where We Stand
We now have everything we need to run the full valuation of Maple Ridge:
- FCFF base: $32.5 million (from Part 4)
- Growth rate: 3.3% per year (from Part 5)
- Reinvestment rate: 13.3% (from Part 5)
- WACC: 7.8% (from this post)
In Part 7, we’ll project five years of free cash flows, discount each one back to today, add a terminal value for everything beyond year five, subtract the debt, and arrive at Maple Ridge’s intrinsic value per share.
The One-Sentence Summary
WACC — the Weighted Average Cost of Capital — is the discount rate we use to convert future cash flows into present value; it’s built from the return equity investors require (Cost of Equity) and the rate lenders charge (Cost of Debt), weighted by how much of each makes up the company’s capital structure, and it captures precisely what risk costs.
Next: Part 7 — Putting It All Together. We have the growth rate, the reinvestment rate, and the discount rate. Now we run the full calculation: five years of projected cash flows, a terminal value, the equity bridge, and the intrinsic value per share.
— Jim