Valuation is the process of determining what something is worth in financial terms, whether that’s an entire company, a single share of stock, a piece of real estate, or any other asset. It combines hard data like revenue, profits, and assets with assumptions about future performance to arrive at a dollar figure. Valuation matters every time money changes hands: buying or selling a business, raising investment capital, settling an estate, issuing stock options to employees, or simply deciding whether a stock is a good buy.
The Three Core Approaches
Nearly every valuation method falls into one of three broad categories. Each takes a different angle on the same question, and professionals often use two or all three to cross-check their results.
The income approach converts future earnings into a present-day value. The logic is straightforward: an asset is worth the total cash it will generate over time, adjusted for the fact that a dollar today is more valuable than a dollar five years from now. The most common technique here is the discounted cash flow model, covered in detail below.
The market approach looks at what buyers have actually paid for similar assets. If a competitor sold last year for a known price, that transaction tells you something about what your business might fetch. For publicly traded stocks, the market approach uses pricing ratios (like price-to-earnings) drawn from comparable companies in the same industry.
The cost approach (sometimes called the asset-based approach) asks a simpler question: what would it cost to build or buy a replacement? It adds up the value of all tangible and intangible assets, adjusts for wear and obsolescence, and subtracts liabilities. This method tends to be most useful for asset-heavy businesses like real estate holding companies or manufacturers with significant equipment, where the value lives in physical things rather than future cash flow.
How Discounted Cash Flow Works
Discounted cash flow, or DCF, is the workhorse of the income approach. It requires three main inputs: projected future cash flows, an expected growth rate for those cash flows, and a discount rate that represents the return an investor would need to justify the risk. The discount rate is essentially the opportunity cost of tying up capital in this particular investment instead of putting it somewhere else.
In practice, an analyst builds a financial model that forecasts what a company will earn each year for the next five to ten years, then estimates a “terminal value” for everything beyond that horizon. Each year’s projected cash flow gets divided by a factor that shrinks it back to today’s dollars. Add all those discounted amounts together, and you get the company’s estimated present value.
The strength of DCF is that it’s grounded in the specific economics of the business you’re analyzing. The weakness is that small changes in assumptions, especially the discount rate or long-term growth rate, can swing the final number dramatically. A company projected to grow at 5% annually looks very different from one growing at 8%, even if every other input stays the same.
How Comparable Multiples Work
The market approach most commonly shows up as “comparable company analysis,” or simply “comps.” Instead of building a detailed forecast, you look at how the market prices similar businesses and apply those ratios to the company you’re valuing. The most widely used multiples are price-to-earnings (P/E), price-to-sales (P/S), and enterprise value to EBITDA (EV/EBITDA). EBITDA stands for earnings before interest, taxes, depreciation, and amortization, and it’s a rough proxy for operating cash flow.
Here’s a simple example: say a company earns $0.50 per share in the trailing twelve months, and similar companies in its industry trade at an average P/E ratio of 18.5x. Multiplying $0.50 by 18.5 gives you roughly $9.25 as an estimated share value. The same logic works at the enterprise level using EV/EBITDA.
Multiples vary enormously by industry. Data from NYU Stern as of January 2025 shows EV/EBITDA multiples ranging from about 5x in oil and gas production to nearly 35x in semiconductors and over 30x in internet software. The total market average sits around 19.7x. That spread reflects differences in growth expectations, capital intensity, and risk. A fast-growing software company with recurring revenue commands a much higher multiple than a capital-heavy energy producer with volatile commodity prices.
Valuation for Startups
Early-stage companies rarely have the profits or track record needed for a traditional DCF analysis, so startup valuations rely more heavily on negotiation, market comparisons to recent funding rounds, and the terms of the deal itself. Two terms you’ll hear constantly are pre-money valuation and post-money valuation.
Pre-money valuation is what the company is worth before new investment money comes in. Post-money valuation includes the new capital. The math is simple: if an investor puts in $3 million and receives 10% of the company, the post-money valuation is $30 million ($3 million divided by 10%), and the pre-money valuation is $27 million ($30 million minus the $3 million investment).
The distinction matters because it determines how much ownership existing founders retain. If you and an investor agree on a “$10 million valuation” but don’t clarify whether that’s pre-money or post-money, a $2 million investment could mean the investor owns 16.7% of the company (pre-money) or 20% (post-money). That gap only grows with larger rounds.
When a Formal Valuation Is Required
Sometimes valuation isn’t optional. The IRS requires companies to establish fair market value in several situations, and getting it wrong can trigger penalties.
The most common trigger is equity compensation. Under Section 409A of the tax code, if a company grants stock options to employees, the exercise price (the price at which the employee can buy shares) must be at or above the stock’s fair market value on the grant date. If the exercise price is set too low, the options are treated as deferred compensation, which exposes the employee to immediate taxes, a 20% penalty, and interest charges. Private companies without a public stock price typically hire an independent appraiser to produce what’s known as a “409A valuation,” usually updated annually or after any event that significantly changes the company’s value, like a new funding round.
Estate and gift taxes also require valuation. When someone passes a business interest to heirs or gives equity as a gift, the IRS needs a defensible fair market value to calculate the tax owed. The IRS points to its own estate tax regulations as a benchmark for what constitutes a reasonable valuation method in these cases.
Other common triggers include divorce proceedings (where a business owned by one or both spouses needs to be divided), shareholder disputes, mergers and acquisitions, and insurance claims.
What Drives Differences in Value
Two people can look at the same company and arrive at very different valuations, and both can be reasonable. The gap usually comes down to a few key variables.
Growth expectations matter most. A company growing revenue at 30% per year will be valued far more aggressively than one growing at 5%, even if their current earnings are identical. The discount rate is another lever: a buyer who sees the investment as risky will apply a higher discount rate, which shrinks the present value of future cash flows. Industry also plays a major role, as the wide range in EBITDA multiples shows. A restaurant chain and a healthcare technology company might generate the same profits but trade at very different multiples because the market expects different futures for each industry.
Control and liquidity affect valuation too. A 100% ownership stake in a company is worth more per share than a 5% minority stake, because the majority owner controls decisions. Shares in a private company are worth less than equivalent shares in a public company, simply because they’re harder to sell. Appraisers often apply discounts of 15% to 35% for lack of marketability when valuing private business interests.
Valuation Beyond Business
While business valuation gets the most attention, the same principles apply elsewhere. Real estate appraisals use the cost approach (what would it take to rebuild this property?), the market approach (what did comparable homes sell for?), and the income approach (what rent will it generate?). Bond pricing is essentially a DCF calculation, discounting future interest payments and the return of principal. Even personal financial planning involves informal valuation when you estimate what your retirement portfolio will be worth in 20 years based on expected returns.
Regardless of the context, valuation always comes back to the same core question: given what this asset can produce and what similar assets sell for, what is a fair price today? The method you choose depends on the type of asset, the data available, and the purpose of the valuation. In most serious transactions, using more than one approach and comparing the results gives you the most reliable answer.