A discounted cash flow analysis, or DCF, works by forecasting the cash a business will produce in future years, shrinking those future dollars down to what they are worth today, and adding everything up to arrive at a value for the company. The logic rests on a simple point: a dollar you receive in five years is worth less than a dollar in your pocket now, because the dollar in hand can be invested in the meantime. A DCF puts a number on that trade-off. The work breaks into five steps: projecting free cash flows, choosing a discount rate, estimating a terminal value, discounting everything back to the present, and bridging from the resulting enterprise value to what equity holders actually own.
Step 1: Project the Free Cash Flows
Free cash flow to the firm is what a business generates from operations after paying for the investment needed to keep running. You start with earnings before interest and taxes (EBIT) and make four adjustments:
- Subtract taxes by applying the effective tax rate to EBIT. The U.S. federal corporate rate is 21% and permanent under current law; with state corporate taxes layered on, most companies land at an effective rate around 25% to 26%.1Tax Policy Center. How Do US Corporate Income Tax Rates and Revenues Compare With Other Countries
- Add back depreciation and amortization. These are accounting charges that reduce reported earnings without actually moving cash out the door.
- Subtract capital expenditures. Money spent on property, equipment, and other long-lived assets isn’t available to investors.
- Adjust for the change in net working capital. Growing inventory or slower customer collections consume cash; better supplier terms free it up.
Written out: free cash flow = EBIT × (1 − tax rate) + depreciation and amortization − capital expenditures − change in net working capital.
Most models project these figures five to ten years forward, using historical trends, management guidance, and industry benchmarks to build each year. Going further is possible but introduces so much guesswork that the extra detail rarely improves accuracy.
Step 2: Choose a Discount Rate
The discount rate is the single most consequential assumption in the whole exercise. It represents the minimum return an investor would need to put money into this business instead of something else with similar risk. A higher rate penalizes future cash flows more heavily and pushes the valuation down; a lower rate does the opposite.
Weighted Average Cost of Capital
Most DCFs use the weighted average cost of capital (WACC). WACC blends the return equity investors demand with the interest rate the company pays on its debt, weighted by how much of each sits in the capital structure. A firm funded 60% by equity and 40% by debt weights each cost accordingly. Because interest on debt is tax-deductible, the debt component is adjusted after-tax, which lowers the overall WACC.2Internal Revenue Service. Questions and Answers About the Limitation on the Deduction for Business Interest Expense
Cost of Equity Through CAPM
The cost of equity is the trickier half, since no contract spells out what equity investors require. The Capital Asset Pricing Model gives the standard estimate:
Cost of equity = risk-free rate + beta × equity risk premium.
- The risk-free rate is the yield on the 10-year U.S. Treasury note, around 4.15% as of early 2026.3Federal Reserve Bank of St. Louis. Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity
- Beta measures how a stock moves relative to the broader market. A beta of 1.0 tracks the market; a utility might sit near 0.5, a high-growth tech firm at 1.5 or higher.
- The equity risk premium is the extra return investors want for holding stocks instead of government bonds. Aswath Damodaran at NYU Stern pegged the implied U.S. premium at roughly 4.5% as of January 2026.4NYU Stern. Country Default Spreads and Risk Premiums
For a stock with a beta of 1.2, cost of equity works out to 4.15% + 1.2 × 4.5% = 9.55%. That number feeds into the WACC calculation.
A Size Premium for Smaller Companies
When valuing a small or mid-cap, many analysts add a size premium on top of the CAPM output. Smaller firms carry more risk: less diversified revenue, thinner management teams, tighter access to capital. Data from providers like Kroll shows that the smallest publicly traded companies can carry a size premium above 10%, and mid-size firms often warrant 2% to 4%. For privately held businesses, the adjustment is typically larger still. Skipping this step is a common way DCFs overvalue small companies.
Step 3: Estimate the Terminal Value
A business doesn’t stop generating cash at the end of year five or ten, so the model needs a way to capture everything after the explicit forecast. That number is the terminal value, and it regularly accounts for 60% to 70% of the total DCF valuation. Two methods dominate.
The Gordon Growth Method
This method assumes cash flows grow at a single, constant rate forever:
Terminal value = next year’s free cash flow ÷ (discount rate − perpetual growth rate).
The perpetual growth rate typically falls between 2% and 4%, roughly matching long-run inflation or nominal GDP growth. A rate higher than GDP growth implies the company eventually outgrows the whole economy, which isn’t sustainable.5NYU Stern. Estimating Terminal Value The approach fits mature businesses with predictable cash flow.
One detail trips people up: the cash flow in the numerator should reflect a normalized year of operations, not one skewed by one-time gains or unusual capital spending. Otherwise a temporary distortion compounds into perpetuity.
The Exit Multiple Method
Instead of assuming perpetual growth, this method values the company at the end of the projection using a market multiple. An analyst might apply, say, a 10× multiple to final-year EBITDA. The multiple comes from recent sales of similar companies or current trading multiples of public comparables. SEC filings and M&A databases provide the transaction data.6SEC. Valuation Report by Corporate Valuation Advisors Inc Exit multiples are especially common in private equity, where the whole point is often to estimate what the business could sell for in several years.
The two methods frequently produce different numbers. Some analysts average them; others pick whichever fits the business better.
Step 4: Discount and Sum the Cash Flows
With projections, a discount rate, and a terminal value in hand, you convert everything into today’s dollars. Each year’s cash flow gets divided by (1 + discount rate) raised to the power of how many years out it sits. Year one is divided by (1 + r)¹, year two by (1 + r)², and so on. The terminal value, since it represents value at the end of the forecast, is discounted using the same exponent as the final projection year.
Many models use a mid-year convention instead of assuming all cash arrives on December 31. Since businesses actually generate cash throughout the year, the mid-year approach subtracts 0.5 from each exponent. Year one becomes (1 + r)^0.5, year two (1 + r)^1.5, and so on. The valuation ticks up modestly because the cash is treated as arriving six months sooner on average. It’s standard in most professional models.
Sum the discounted cash flows and the discounted terminal value, and you have the enterprise value: what the whole business is worth to all capital providers combined.
Step 5: Bridge from Enterprise Value to Equity Value
Enterprise value isn’t what equity holders own. To get there, subtract prior claims on the company’s cash and add back assets that weren’t captured in the operating projections:
- Subtract total debt. Bondholders and lenders get paid before shareholders.
- Subtract preferred stock. Preferred holders also have priority over common equity.
- Subtract non-controlling interests. If the company consolidates a subsidiary it doesn’t fully own, the minority owners’ share has to be carved out. Missing this is a surprisingly common error that inflates equity value.
- Subtract other obligations such as pension deficits, lease obligations, and material provisions.
- Add cash and cash equivalents. Cash on the balance sheet is available to shareholders beyond what the operating projections already captured.
- Add non-operating investments. Stakes in other companies or excess real estate that generate value outside the core.
Divide the resulting equity value by shares outstanding and you have a per-share intrinsic value. If it comes out higher than the current market price, the DCF suggests the stock is undervalued. Lower, and it may be trading at a premium to what the cash flows justify.
A Worked Example
Say you’re valuing a small manufacturer. Projected free cash flows over five years (in thousands) are $2,345, $2,510, $2,720, $2,795, and $2,800. WACC comes out to 8.5%, and the terminal value at the end of year five is $41,344.
Discount each year:
- Year 1: $2,345 ÷ (1.085)¹ = $2,161
- Year 2: $2,510 ÷ (1.085)² = $2,133
- Year 3: $2,720 ÷ (1.085)³ = $2,130
- Year 4: $2,795 ÷ (1.085)⁴ = $2,018
- Year 5: $2,800 ÷ (1.085)⁵ = $1,863
- Terminal value: $41,344 ÷ (1.085)⁵ = $27,510
Sum the present values and enterprise value lands at roughly $37,815. If the company carries $5,000 in debt and holds $1,200 in cash, equity value is $37,815 − $5,000 + $1,200 = $34,015. Divide by 10,000 shares outstanding and you get $3.40 per share. The whole exercise reduces to three questions: how much cash will the business generate, how risky is it, and what are the claims against that cash.
Stress-Testing the Result
A single DCF output is a point estimate built on a stack of assumptions. The honest answer to “what is this business worth?” is almost always a range.
The two variables with the most leverage are the discount rate and the terminal growth rate. A standard approach is a sensitivity matrix: rows show different WACC values (say, 7.5% to 10%), columns show different terminal growth rates (say, 2% to 4%), and each cell shows the valuation that results. Bumping WACC from 8.5% to 10% while holding everything else constant can drop enterprise value meaningfully, because terminal value is so sensitive to the gap between the discount rate and the growth rate.
Beyond a two-variable matrix, many analysts build full scenario models with base, optimistic, and pessimistic cases. Each scenario adjusts revenue growth, margins, capital spending, and the discount rate together to reflect a coherent story: a recession in year two with compressed margins and higher borrowing costs, or market share gains with falling input costs. The spread between scenarios tells you more about the risk than any single number can.
Where a DCF Falls Short
DCF is the workhorse of fundamental valuation, but it has real blind spots.
The deepest limitation is garbage in, garbage out. The output rests on cash flow projections that are, at bottom, educated guesses. For mature companies with long histories, stable margins, and predictable demand, those guesses can be reasonably good. For startups with no revenue history, companies in rapidly shifting industries, or businesses in distress, the projections are so uncertain that the DCF result can be nearly meaningless. Comparable company multiples or asset-based valuations may offer a more grounded starting point in those cases.
Terminal value concentration is a structural weakness. When 60% to 70% of the number comes from a single assumption about perpetuity, precision is suspect. Small changes to the terminal growth rate or exit multiple cascade through the entire valuation, which is why sensitivity analysis is essential rather than optional.
Finally, DCF models build forward-looking estimates from backward-looking inputs. Growth rates are often extrapolated from historical trends, margins are anchored to recent performance, and capital spending follows past patterns. None of that captures disruptive technology shifts, regulatory changes, or new competitive entries that could reshape the business. The model works best when the future roughly resembles the past. When it doesn’t, the numbers can look precise and still be dangerously misleading.