A discount rate is the interest rate used to convert a future dollar into what it is worth today, and calculating one means either looking up the rate the Federal Reserve charges banks that borrow from it or, far more commonly, building a rate from the risk-free return plus a premium for the risk of the investment you are valuing. The question “what is a discount rate and how is it calculated” has two honest answers because the phrase covers two different tools: a monetary policy lever set by the Fed, and a valuation input that investors and companies compute themselves. Both rest on the same idea — a dollar today is worth more than a dollar later — but the people using them, the math behind them, and the numbers they produce have almost nothing in common.
The Two Meanings of Discount Rate
When a banker uses the term, they usually mean the rate the Federal Reserve charges commercial banks that borrow directly from a regional Federal Reserve Bank through the “discount window.” That rate is set by the Fed and published; no one calculates it from scratch.
When an investor, analyst, or corporate finance team uses the term, they mean the rate applied to future cash flows to figure out present value. That rate is calculated, and the calculation is where most of the work sits. The rest of this article walks through the financial version first, because that is the one people actually build, then returns to the Fed’s rate and how the two connect.
What the Financial Discount Rate Represents
The financial discount rate is the minimum return an investment must earn to justify tying up your capital. It compensates for two things.
The first is the pure cost of waiting: the return you give up by not having the cash available now. This baseline is usually pegged to the yield on U.S. Treasury bonds, the closest thing to a risk-free return. In early 2026 the 10-year Treasury yield sits around 4.2%.
The second is risk. A Treasury bond and a speculative startup both involve waiting for future payments, but the startup might never pay at all. The riskier the investment, the higher the discount rate an investor demands. That risk premium can add a few percentage points for a stable business or push into double digits for ventures with uncertain outcomes.
Read another way, the discount rate is an opportunity cost. If you can reliably earn 10% elsewhere, a new project must offer at least 10% to justify pulling your money away.
How Companies Calculate Their Discount Rate
For most corporations, the discount rate used to evaluate new investments is the Weighted Average Cost of Capital, or WACC. WACC is the blended cost of all the money the company uses to fund its operations, combining debt and equity in proportion to how much of each the company carries.
The formula weights each source by its share of the total:
WACC = (E/V) × Re + (D/V) × Rd × (1 – t)
E is the market value of equity, D is the market value of debt, V is the total (E + D), Re is the cost of equity, Rd is the cost of debt, and t is the corporate tax rate. Any new project must earn at least the WACC to cover the cost of the capital funding it.
Cost of Debt
The cost of debt is the effective interest rate a company pays on its borrowings. One wrinkle matters: interest payments are generally tax-deductible under 26 U.S.C. § 163, so the real cost of debt is lower than the headline rate.1Office of the Law Revision Counsel. 26 USC 163 – Interest With the federal corporate tax rate at 21%, a company paying 6% on its loans has an after-tax cost of debt of about 4.74% (6% × 0.79). That tax shield is one reason debt financing can look attractive, though it comes with the trade-off of higher financial risk as leverage grows.
Cost of Equity
The cost of equity is harder to pin down because shareholders don’t get fixed, predictable payments the way bondholders do. The standard approach is the Capital Asset Pricing Model (CAPM), which estimates the return equity investors demand based on how risky the stock is relative to the broader market.
The CAPM formula is:
Re = Rf + β × (Rm – Rf)
Rf is the risk-free rate (typically the 10-year Treasury yield), β measures how much the stock moves relative to the market, and (Rm – Rf) is the equity risk premium, the extra return investors expect for holding stocks instead of Treasuries. A widely referenced estimate of the U.S. equity risk premium for 2026 is around 4.2%.
Beta is where the model gets specific to the company. A beta of 1.0 means the stock moves in step with the market. Above 1.0, the stock is more volatile, and investors demand a higher return to compensate. A utility might carry a beta of 0.5; an aggressive tech firm could sit at 1.5 or higher.
How Industry Shapes the Rate
WACC varies dramatically across industries because risk profiles differ. Data from January 2026 shows the spread: general utilities carried a WACC of about 4.4%, computer services about 7.8%, semiconductor firms about 10.6%, and internet software companies about 10.7%. Those gaps reflect real differences in cash flow predictability, capital intensity, and competitive dynamics. A regulated utility with locked-in customers really is less risky than a software startup burning cash to chase growth, and the discount rate captures that.
When WACC Doesn’t Fit
A single company-wide WACC works as a general hurdle rate, but it breaks down when a diversified firm evaluates projects with very different risk profiles. A consumer goods company expanding into cryptocurrency mining should not discount that venture at the same rate it uses for a new packaging line. The common fix is to add a project-specific risk premium on top of WACC. A firm with an 8% WACC might apply a 12% discount rate to a speculative foreign market expansion.
Small, privately held businesses face a different problem. Without publicly traded stock, they have no beta and cannot compute a reliable WACC. Instead, they build a discount rate by stacking components: the risk-free rate, an equity risk premium, a size premium for being a smaller firm, and a company-specific risk premium. The size premium alone can add several percentage points, and for the smallest closely held firms, research shows size premiums well into double digits.
Putting the Rate to Work: Net Present Value
Once you have a discount rate, the most common thing to do with it is calculate Net Present Value, or NPV. NPV takes every expected future cash flow, discounts each one back to today’s dollars using the discount rate, and subtracts the upfront cost. The result tells you, in today’s money, how much value the project creates or destroys.
The formula is:
NPV = Σ [Ct / (1 + r)^t] – C₀
Ct is the cash flow in each future period t, r is the discount rate, and C₀ is the initial investment. The exponent compounds the discount over time, which means cash flows further in the future get penalized more heavily. A dollar arriving 20 years from now is worth far less today than one arriving next year.
A positive NPV means the project returns more than it costs after accounting for the time value of money and required return. A negative NPV means it does not clear the bar.
A Concrete Example
Say a company is weighing a $100,000 investment expected to generate $30,000 per year for five years. At a 10% discount rate, the present value of those cash flows works out to about $113,700, an NPV of roughly $13,700. The project clears the hurdle. Raise the discount rate to 15%, and the present value drops to about $100,600, barely breaking even. At 16%, NPV goes negative and the project should be rejected. That is how sensitive valuations are to the discount rate you choose.
NPV is one application of a broader technique called discounted cash flow (DCF) analysis, which is the standard method for valuing companies, real estate, and other income-producing assets. In a DCF model, an analyst projects free cash flows over five to ten years, discounts them using WACC or the cost of equity, and adds a “terminal value” for everything beyond the forecast horizon. The discount rate is the single most influential input in the model. Small changes ripple through every year of projected cash flows and amplify in the terminal value, which often accounts for more than half the total valuation.
The Federal Reserve Discount Rate
The other meaning of “discount rate” is the interest rate the Federal Reserve charges when commercial banks borrow directly from a regional Federal Reserve Bank through the discount window. It is separate from the more widely reported federal funds rate, which is the target rate banks charge each other for overnight loans. As of early 2026, the federal funds target range sits at 3.50% to 3.75%, and the primary credit rate at the discount window is 3.75%.2FRED | St. Louis Fed. Discount Window Primary Credit Rate (MPCREDIT)
You do not calculate this rate. The Federal Reserve sets it and publishes it, and it moves when the Fed decides credit conditions should tighten or loosen. The rate applies at three tiers of the discount window: primary credit for financially sound banks, secondary credit for weaker banks (priced 50 basis points above primary credit), and seasonal credit for smaller banks with predictable annual swings in funding needs, such as agricultural lenders.3The Federal Reserve. Primary and Secondary Credit Programs The seasonal rate floats based on the average of the federal funds rate and the rate on three-month certificates of deposit.4The Federal Reserve Discount Window. Seasonal Credit Program
How the Two Rates Connect
The Fed’s rate and the financial discount rate are linked through a powerful transmission channel. When the Federal Reserve raises its target federal funds rate, the risk-free rate at the foundation of every CAPM and WACC calculation moves up with it. Cost of equity rises immediately. Banks raise the interest rates they charge on loans, so cost of debt rises too. The combined result: WACC rises across the board.
Higher WACC means fewer projects clear the profitability hurdle. Companies shelve expansion plans. Consumers face pricier mortgages and pull back on spending. That deliberate cooling is how the Fed fights inflation. The reverse happens when the Fed cuts rates: WACC falls, marginal projects suddenly look profitable, borrowing gets cheaper, and investment picks up.
The effect is largest for long-duration assets like growth stocks, real estate, and infrastructure projects. These assets derive most of their value from cash flows far in the future, and distant cash flows are the most sensitive to the discount rate. A shift from 7% to 9% reduces the present value of a cash flow arriving in 20 years by more than 25%. That is why technology stocks with high growth expectations can swing sharply on nothing more than a change in the Fed’s tone about future rate policy. Investors are not reacting to today’s earnings; they are repricing decades of expected future earnings through a different discount rate.