What Is DCF? Discounted Cash Flow Valuation Explained

What is DCF? DCF stands for Discounted Cash Flow, a valuation method that estimates the value of a business today by projecting its future cash flows and discounting them back to present value using a required rate of return. DCF is the foundation of how investment bankers, private equity firms, and corporate strategists value a company in any M&A transaction.

This guide walks through the DCF method the way a real M&A practitioner uses it: the formula, the inputs, the worked numbers, the common mistakes, and the situations where DCF is the wrong tool. By the end you will know how a discounted cash flow model is built, why two analysts can plug similar inputs into the same model and get a 40 percent difference in value, and how lower middle market sellers should think about DCF when they sit down with a buyer.

What Is DCF in Plain English

DCF is the financial version of a simple question: if I buy this business today, what is the cash it will put in my pocket over the years I own it, and how much is that future cash worth right now? A dollar arriving five years from now is not worth a dollar today. It is worth less, because that dollar is uncertain and because if I had the dollar today I could invest it. DCF puts a precise number on that idea.

The discounted cash flow method does three things in sequence. First, it projects the free cash flow the business will generate each year for a defined forecast period, usually 5 to 10 years. Second, it estimates a terminal value, which captures all of the cash flows beyond the forecast period in a single number. Third, it discounts both the explicit forecast cash flows and the terminal value back to today using a discount rate that reflects the risk of those cash flows.

The sum of those discounted values is the enterprise value of the business. Subtract net debt and you get the equity value, which is what the owner actually walks away with at closing. For a deeper view of how this fits the broader sell-side process, see our guide on how investment bankers value a business.

Every DCF rests on three assumptions: the cash flows you forecast, the rate at which the business grows after the forecast ends, and the discount rate you apply. Change any one of these by a small amount and the answer moves. That sensitivity is both the strength and the weakness of DCF.

The DCF Formula: Step-by-Step Walkthrough

The discounted cash flow formula looks intimidating but breaks into two parts you can do on a single page of paper. Here is the standard form used in nearly every M&A model:

DCF = Σ (CFt / (1+r)^t) + (TV / (1+r)^n)

Where:

• CFt = free cash flow in year t
• r = discount rate, typically the Weighted Average Cost of Capital (WACC)
• t = the year number, running 1 through n
• n = the final year of the explicit forecast
• TV = terminal value at the end of year n

The Greek letter sigma just means “add up.” So the first half of the equation tells you to project free cash flow for each year of the forecast, divide each year by (1+r) raised to the power of that year, and add the results. The second half does the same thing to the terminal value, which sits at the end of year n.

The number (1+r)^t is the discount factor. If your WACC is 10 percent and you are discounting a cash flow that arrives 3 years from now, the discount factor is (1.10)^3 = 1.331. So a year-3 cash flow of $2.0 million is worth $2.0M divided by 1.331, or about $1.50 million today.

The step-by-step build looks like this in any M&A shop:

1. Build a 5 to 10 year operating model: revenue, EBITDA, capex, working capital, taxes
2. Derive unlevered free cash flow for each year
3. Calculate a WACC for the business
4. Calculate terminal value using Gordon Growth or an exit multiple
5. Discount each annual cash flow plus terminal value to today
6. Sum the discounted values to get enterprise value
7. Subtract net debt to get equity value
8. Run a sensitivity table on WACC and growth rate to bracket the range

Every line on that list is its own decision, and every decision can be debated. That is why two analysts building DCFs of the same business can land 30 to 50 percent apart on enterprise value before either has made a mistake.

Free Cash Flow: The Input That Drives Everything

The cash flow used in a DCF is not net income, and it is not EBITDA. It is unlevered free cash flow, also called free cash flow to the firm. This is the cash the business produces from operations after reinvesting what it needs to keep running and grow, but before paying interest to lenders or dividends to owners.

The standard build for unlevered free cash flow is:

• Start with EBIT (earnings before interest and tax)
• Subtract taxes on EBIT (use the marginal tax rate, often 25 to 27 percent blended federal and state in the United States)
• Add back depreciation and amortization (non-cash charges)
• Subtract capital expenditures
• Subtract the change in net working capital

That last line is where forecasts often go wrong. A business growing revenue 15 percent a year typically needs more receivables and more inventory, which consumes cash even though the income statement looks great. DCFs that ignore working capital drag systematically overstate value in growth scenarios.

Capex is the second trap. Most lower middle market businesses have a maintenance capex number and a growth capex number. Maintenance keeps the existing asset base productive. Growth capex funds expansion. A DCF that uses depreciation as a proxy for capex assumes the business reinvests exactly what it consumes, which is often wrong for service businesses (where capex is low) and equipment-heavy businesses (where capex runs above depreciation).

Free cash flow forecasts in M&A typically run 5 years for stable businesses, 7 to 10 years for businesses in early growth or recovery, and longer (with explicit terminal year normalization) for capital-intensive infrastructure assets. The longer the explicit forecast, the less the terminal value dominates the answer, which is generally a good thing because terminal value carries the most assumption risk.

Terminal Value: The Other Half of the DCF

For most DCFs of operating businesses, terminal value accounts for 60 to 80 percent of total enterprise value. That is not a flaw of the method, it is just math: a business is presumed to continue operating after year 5 or year 10, and all of those future cash flows have to be captured somehow. They are captured in a single number called terminal value.

There are two accepted ways to calculate terminal value, and a careful DCF runs both as a sanity check.

Gordon Growth Model (Perpetuity Growth Method):

TV = CFn+1 / (r – g)

Where CFn+1 is the cash flow in the first year after the forecast ends, r is the discount rate, and g is the perpetual growth rate. Damodaran at NYU Stern publishes the most widely cited datasets on long-run growth rates, and a defensible g for a mature US business in 2026 sits in the 2.0 to 2.5 percent range, roughly tracking long-run nominal GDP growth. Pushing g above 3.5 percent without strong justification will get pushback from any buyer’s deal team.

Exit Multiple Method:

TV = Terminal Year EBITDA × Exit Multiple

The exit multiple is sourced from comparable transaction data. Pitchbook Private Company Multiples 2026 shows lower middle market EBITDA multiples in the 5.5x to 7.5x range across most sectors, with healthcare services, B2B SaaS, and specialty industrial trading higher and asset-light consumer trading lower. Whatever multiple you use for terminal value, it must be defensible against the actual comp set, not aspirational.

When the two methods disagree by more than 15 percent, something is off. Either the Gordon Growth assumption is too aggressive, the exit multiple is from the wrong comp set, or the terminal year cash flow is not a fair “normalized” representation of the business. The reconciliation step is what separates a real DCF from a spreadsheet exercise.

WACC: The Discount Rate Explained

The discount rate in a DCF is the Weighted Average Cost of Capital, or WACC. WACC blends the cost of equity and the after-tax cost of debt according to the company’s target capital structure. The formula:

WACC = (E / V) × Re + (D / V) × Rd × (1 – T)

Where E is market value of equity, D is market value of debt, V is E + D, Re is cost of equity, Rd is cost of debt, and T is the marginal tax rate.

Cost of equity is calculated using the Capital Asset Pricing Model (CAPM):

Re = Rf + β × (Rm – Rf)

Where Rf is the risk-free rate, β is the company’s beta versus the market, and (Rm – Rf) is the equity risk premium.

Here is a defensible WACC build-up for a lower middle market business as of 2026:

Three notes on this build. First, the size premium is real and material. The Kroll Cost of Capital Navigator (formerly Duff and Phelps) publishes decile-based size premiums that add 2 to 6 percent to the cost of equity for small companies. Ignoring it on a $50 million enterprise value deal understates WACC by hundreds of basis points and overstates value by 20 to 30 percent. Second, beta for private companies has to be estimated from public-company comps and re-levered to the target capital structure. Third, the cost of debt should reflect what a buyer would actually pay, not what the seller pays today, because the DCF is from the buyer’s perspective.

Worked DCF Example: A $5M EBITDA Business

Now we put the formula to work. Assume a B2B services business with the following profile entering year 1:

• Revenue: $25.0 million
• EBITDA: $5.0 million (20% margin)
• D&A: $0.5 million
• Capex: $0.6 million
• Net working capital: 15% of revenue
• Revenue growth: 8% in years 1-3, 6% in years 4-5
• Tax rate: 25%
• WACC: 12.0% (from the build above)
• Perpetual growth rate (g): 2.5%

The 5-year unlevered free cash flow projection:

Sum of present values of explicit forecast cash flows: $13.41 million.

Now terminal value. Using Gordon Growth with year-6 FCF of $4.45M (4.34 grown at 2.5%):

TV = $4.45M / (0.12 – 0.025) = $4.45M / 0.095 = $46.84 million

Discount terminal value back to today: $46.84M / 1.762 = $26.58 million.

Enterprise value = $13.41M + $26.58M = $39.99 million, call it $40.0 million.

Cross-check with exit multiple: terminal year EBITDA of $7.08M at a 6.5x exit multiple gives TV of $46.0M, very close to the Gordon Growth answer. The two methods agree, which builds confidence in the result.

At $5.0M of trailing EBITDA, $40.0M enterprise value implies an entry multiple of 8.0x. That is on the high end for a B2B services business in 2026, which makes sense because the model assumes durable 6 to 8 percent growth and stable margins. If the buyer demanded a 14 percent WACC instead of 12 percent, the same model would produce roughly $30.5M enterprise value, a 6.1x entry multiple. That swing is the WACC sensitivity in action.

The sensitivity table below shows enterprise value (in $ millions) at different WACC and perpetual growth assumptions, which is the standard 2-axis sensitivity every DCF model in M&A includes:

Buyers and sellers negotiate within this grid. Where you land depends on which cells you can defend with data. To translate enterprise value into what the seller actually receives, you subtract net debt at closing. For a refresher on that calculation, see our guide on what is net debt.

DCF vs Comparable Company Analysis vs Precedent Transactions

DCF is one of three core valuation methods in M&A. The other two are Comparable Company Analysis (trading comps) and Precedent Transactions (deal comps). Every defensible valuation triangulates across all three.

Comparable Company Analysis looks at how the public market currently values similar businesses, expressed as multiples of revenue, EBITDA, or earnings. If five publicly traded competitors trade at an average of 8.5x EBITDA, that anchors what your business should be worth. The strength: it reflects current market sentiment. The weakness: public-company multiples include a liquidity premium that private companies do not earn.

Precedent Transactions look at what acquirers actually paid for similar businesses in completed M&A deals. Pitchbook, S&P Capital IQ, and Mergermarket are the standard data sources. The strength: it includes control premiums and synergy values that real buyers paid. The weakness: market conditions at the time of past deals may not match today, and disclosed multiples often exclude earnouts and rollover equity.

DCF is the only method that values the business based on the cash it will actually produce, not on what the market thinks similar businesses are worth. The strength: it forces explicit assumptions and is portable across cycles. The weakness: small changes in WACC or terminal growth swing the answer by tens of percent.

In practice, a strong M&A valuation runs all three, plots them on a “football field” chart showing the value range from each method, and identifies the overlap zone as the negotiable range. DCF typically anchors the high end (because it captures the business’s future cash potential), trading comps anchor the middle (because they reflect public liquidity), and precedent transactions anchor the high end again (because they include control premiums). For a broader treatment, see business valuation services cost.

Why DCF Is Loved and Hated in M&A

DCF gets loved because it is the only valuation method grounded in first principles. A business is worth the cash it will produce, discounted for time and risk. That is what value means. Trading comps and precedent transactions are useful, but they are ultimately polls of what other people paid. DCF asks the harder question: what is this thing actually worth.

DCF also forces the analyst to make explicit assumptions about growth, margins, capex, and risk. Those assumptions can be debated, stress-tested, and revised as new information comes in. A trading comp screenshot tells you nothing about why a business should trade at 8.5x or 6.0x. A DCF tells you exactly which assumptions get you to each value.

DCF gets hated for the same reason. The answer depends almost entirely on inputs that nobody can know with precision: 5-year revenue growth, terminal growth, the right beta for a private company, the size premium, the risk-free rate at the time of valuation. Garbage in, garbage out. A DCF run by an analyst with an agenda can produce almost any answer the analyst wants, and the math will all check.

Three honest critiques of DCF in M&A:

• Terminal value dominates the answer. Often 70 percent or more of total value comes from a single number whose inputs are speculative.
• Discount rate calibration is more art than science for private companies. The size premium, beta, and capital structure decisions move WACC by 200 to 400 basis points easily.
• Forecast accuracy beyond year 3 is poor in most businesses. Extending an explicit forecast to year 10 creates false precision.

The right way to use DCF in M&A: as one input among three, with sensitivity ranges shown rather than point estimates, and with a clear narrative explaining which assumptions drive the answer. A DCF presented as a single number with no sensitivity is a DCF designed to mislead.

Common DCF Mistakes That Inflate (or Crush) Valuations

After hundreds of M&A processes, the same DCF errors show up again and again. Knowing them is half the battle when you sit across from a buyer arguing valuation.

Mistake 1: Using EBITDA as free cash flow. EBITDA ignores capex, working capital, and taxes. A business with $5M of EBITDA might generate $2.5M of unlevered free cash flow after the real cash investments needed to keep operating. Discounting EBITDA overstates value by 30 to 50 percent.

Mistake 2: Ignoring the size premium. Public-company betas applied directly to a $30M EV business without a Kroll-grade size premium produces a WACC that is 200 to 400 basis points too low. The DCF then produces a valuation that no real buyer would pay.

Mistake 3: Aggressive terminal growth rates. Setting g at 4 percent or higher implies the business will grow faster than the broader economy forever. That is impossible. Defensible g for mature US businesses sits between 2.0 and 2.5 percent.

Mistake 4: Holding margins flat in the explicit forecast despite competitive pressure. Buyers will challenge any forecast that shows 20 percent EBITDA margins for 5 straight years if the comp set is at 14 percent and converging downward.

Mistake 5: Forgetting working capital drag on growth. A business growing 15 percent a year typically needs to fund 15 percent more receivables and inventory. That is real cash out the door that suppresses free cash flow during the growth phase.

Mistake 6: Using the wrong capital structure. WACC weighs are supposed to reflect the target capital structure of the buyer, not the seller’s current debt. A founder-owned business with zero debt today does not have a 0% cost-of-debt advantage in a buyer’s DCF.

Mistake 7: Reconciling Gordon Growth and exit multiple by force. If the two methods produce wildly different terminal values, the right response is to investigate which inputs are wrong, not to average them.

Mistake 8: Ignoring tax shields on debt. Interest is tax deductible, so the after-tax cost of debt is what goes into WACC, not pre-tax. Skipping the (1 – T) adjustment overstates WACC and understates value.

Mistake 9: Not running sensitivities. A DCF that produces a single number invites a fight. A DCF that shows a $36M to $46M range across reasonable WACC and growth assumptions invites a negotiation about which cell is right.

Mistake 10: Confusing enterprise value with equity value. Enterprise value is what the business is worth. Equity value is what the seller gets after net debt. Mixing the two costs sellers money at the LOI stage.

DCF for Private Companies: The Liquidity and Size Premium Adjustments

Textbook DCF assumes the business being valued is roughly comparable to a publicly traded company: liquid stock, audited financials, low concentration risk, and a beta you can pull from Bloomberg. Lower middle market businesses violate every one of those assumptions, and the DCF has to be adjusted accordingly.

Size premium. The Kroll Cost of Capital Navigator 2026 publishes size premiums by decile of market cap. Businesses in the smallest decile (under $300M in market cap, which captures most lower middle market companies) carry a size premium of 3.5 to 5.5 percent above the CAPM-implied cost of equity. This premium reflects the empirical reality that smaller businesses are riskier: more customer concentration, less product diversification, thinner management benches, and weaker access to capital.

Discount for lack of marketability (DLOM). A privately held business cannot be sold tomorrow at a posted price. Selling a private company takes 6 to 12 months and significant transaction costs. The DLOM, typically 15 to 30 percent applied to the equity value, captures this illiquidity. Some practitioners build it into WACC instead, but the cleaner approach is a separate equity-value adjustment.

Discount for lack of control (DLOC). If the DCF values a minority interest, a DLOC of 10 to 25 percent applies because the minority holder cannot direct cash flows or sell the business. For full-control sell-side mandates this discount does not apply.

Customer concentration adjustments. A business where the top customer represents 30 percent of revenue carries meaningfully more risk than the comp set. Common practice is to add 100 to 300 basis points to WACC, or to haircut terminal value by 10 to 25 percent.

Key person risk. If the founder is critical to operations and is exiting at closing, buyers will discount the DCF to reflect the transition risk. The adjustment is usually quantified through lower terminal growth or a higher WACC rather than a separate haircut.

The aggregate impact of these adjustments on a small private company can be enormous. A textbook DCF showing $50M enterprise value can collapse to $32 to $38M once size premium, DLOM, and concentration adjustments are applied. Sellers who do not understand these adjustments often anchor on the textbook number and then feel cheated when buyer LOIs come in 25 percent below.

When DCF Is the Wrong Tool

DCF is not always the right valuation method. There are situations where the answer it produces is misleading or where the inputs cannot be estimated with enough confidence to make it useful.

Pre-revenue or pre-profitability businesses. A DCF on a business with negative cash flow today and a forecast that hockey-sticks in year 4 is a fiction dressed up as analysis. Use venture-style valuation methods (revenue multiples, comparable financings) instead.

Cyclical businesses at peak or trough. Discounting peak-cycle cash flows produces overvaluation. Discounting trough-cycle cash flows produces undervaluation. Use normalized through-cycle cash flows or multiples-based methods anchored to mid-cycle EBITDA.

Asset-heavy businesses with declining cash flow. For businesses where the underlying real estate, equipment, or inventory is worth more than the going-concern value, asset-based valuation produces a better answer than DCF.

Holding companies and rollups. A holding company is worth the sum of its parts. DCFing it as a single entity hides the underlying value of each business unit.

Highly regulated businesses with binary outcomes. A drug in Phase 3 trials, a mining concession awaiting permits, or a SaaS company whose product depends on a single platform change all have binary outcomes that DCF cannot model cleanly. Use scenario analysis or real options instead.

Distressed or turnaround situations. DCF on a business in restructuring assumes the turnaround works. Better to value the business in a downside scenario, an expected scenario, and an upside scenario, probability-weight them, and triangulate.

The honest answer in M&A is that DCF is a foundational tool, not a sole tool. In a sell-side mandate the DCF supports the negotiating position but rarely sets it alone. Comps and precedent transactions do more of the heavy lifting for businesses below $50M of enterprise value, where buyer behavior is more multiple-driven than first-principles-driven.

How CT Acquisitions Uses DCF in Sell-Side Mandates

On every sell-side mandate we run at CT Acquisitions, the DCF is one of three valuation methods that frame the asking price, the bid solicitation, and the negotiation. Here is exactly how we use it.

Pre-launch valuation. Before we take a business to market, we build a full DCF alongside trading comps and precedent transactions. The DCF tells us what the business is worth based on its own cash flow potential. The comps tell us what buyers are currently paying. The gap between the two informs the asking price and the messaging we use in the confidential information memorandum.

WACC calibration for the target buyer set. Strategic buyers and financial buyers have different costs of capital. A PE fund using 50 percent debt at 8 percent has a different WACC than a strategic acquirer with a 6 percent blended cost of capital. We build sensitivity tables that show what the business is worth from each buyer’s perspective, which informs which buyer types to prioritize in outreach.

Bid evaluation. When LOIs come in, we benchmark each bid against the DCF range. A bid below the DCF low end means the buyer is using aggressive assumptions or wants a bargain. A bid above the DCF high end usually signals strategic value or synergies, which we then verify in management meetings.

Negotiation support. When a buyer pushes back on price, we use the DCF model to identify which assumptions they are challenging. If they want a higher WACC, we show them why our WACC is defensible against Kroll data. If they want lower growth, we show them the historical trend. The DCF gives both sides a shared framework, even when the conclusions differ.

Earn-out structuring. Many lower middle market deals include earn-outs tied to future performance. The DCF projection becomes the contractual baseline. If the buyer believes our forecast, the earn-out is essentially free money. If they do not, we structure the earn-out to capture upside while protecting the seller’s minimum proceeds.

For sellers thinking about a transaction in the next 12 to 36 months, the DCF is also a planning tool. The inputs that drive value (growth rate, EBITDA margin, capex efficiency, customer concentration) are the same metrics owners can improve before going to market. A 2-year preparation plan focused on those drivers can move enterprise value by 20 to 40 percent at closing. For related context on M&A mechanics, see business acquisition meaning explained and what is a horizontal merger.

DCF Frequently Asked Questions

What is DCF in simple terms?

DCF, or discounted cash flow, is a way to estimate what a business is worth today by adding up all the cash it will generate in the future and reducing each future dollar to reflect that money received later is worth less than money received now. The reduction factor is called the discount rate, and the sum of all those discounted future cash flows is the value of the business.

What is a good DCF discount rate for a small business?

For a lower middle market business in 2026, the WACC discount rate typically falls between 11 and 16 percent depending on size, industry, and capital structure. The build-up starts with a 4.3 percent risk-free rate (10-year Treasury), adds a 5.5 percent equity risk premium, multiplies by a relevered beta, adds a 3.5 to 5.5 percent size premium from Kroll Cost of Capital Navigator data, and weights against an after-tax cost of debt around 6 percent.

How accurate is a DCF valuation?

A DCF is only as accurate as its inputs. In practice, two analysts running a DCF on the same business can land 30 to 50 percent apart on value depending on growth, margin, WACC, and terminal value assumptions. That is why M&A practitioners always run sensitivity tables and triangulate DCF results against trading comps and precedent transactions rather than relying on a single point estimate.

Can I do a DCF on a business with no debt?

Yes. The DCF discounts unlevered free cash flow at the weighted average cost of capital. If the business currently has no debt, WACC is built using the target capital structure that a likely buyer would use (often 30 to 50 percent debt for PE-backed deals), not the seller’s current zero-debt position. The DCF reflects what the business is worth to a buyer, not the seller’s status quo.

Why does terminal value account for so much of the DCF?

Because a business is assumed to keep operating after the 5 or 10 year explicit forecast ends, and all those future cash flows have to be captured somewhere. The terminal value is that single number, and it typically represents 60 to 80 percent of total enterprise value in a standard DCF. The longer the explicit forecast period, the smaller the terminal value share, which is one reason careful analysts extend forecasts past 5 years for businesses with meaningful growth runway.

Should I use Gordon Growth or exit multiple for terminal value?

Run both. Gordon Growth applies a perpetual growth rate (typically 2.0 to 2.5 percent) to the terminal year cash flow and discounts by WACC minus that growth rate. Exit multiple multiplies terminal year EBITDA by a market-based multiple from precedent transactions. When the two methods agree within 15 percent, the result is well supported. When they disagree by more, investigate which inputs are wrong before deciding which to trust. In M&A practice, both numbers go in the model and the final valuation lands somewhere between them.