Choosing the Discount Rate for a 409A DCF

How this page fits with our methodology guides: This article covers the discount rate only. For when a 409A uses the income approach at all, and how it is weighted against the market and cost approaches, start with our guide to the income, market and cost approaches in a 409A. This page assumes a DCF is being run and focuses on the cost of capital the DCF is discounted at.

What is the discount rate in a 409A DCF?

The discount rate in a 409A DCF is the annual rate of return an investor would require to take on the risk of the company's projected cash flows. Each year's forecast cash flow, and the terminal value, is divided by one plus that rate raised to the number of years out. Higher risk means a higher rate and a lower present value.

In valuation language, the discount rate is the company's cost of capital. It is the return investors give up by putting money into this business instead of an alternative with similar risk. For the discount rate income approach 409A appraisers use, three things have to line up:

• The risk of the cash flows. A forecast from a pre-profit startup carries more risk than one from a company with years of stable margins, so it needs a higher rate.
• The type of cash flow. Unlevered free cash flows are discounted at a weighted average cost of capital (WACC) to reach enterprise value. Cash flows to equity are discounted at the cost of equity.
• The optimism built into the forecast. A management “success case” needs a higher rate than a probability-weighted forecast that already allows for things going wrong. This point drives most disagreements about startup rates, and we return to it below.

The resulting enterprise value then moves through the rest of the report: cash is added and debt subtracted to reach equity value, which is allocated across share classes and discounted for lack of marketability to reach the value of a common share.

Why the Discount Rate Moves 409A Value More Than Almost Any Other Input

Startup DCFs are unusually sensitive to the rate. Early years often show losses, so nearly all the value comes from a terminal value five or more years out, and that terminal value is discounted the hardest. To show the effect, take a simple five-year forecast of unlevered free cash flow of −$2.0M, −$0.5M, $1.5M, $3.5M and $6.0M, with 4% long-term growth after year five and end-of-year discounting.

Going from 20% to 30% cuts enterprise value by more than half, from $18.6M to $8.2M. Going from 30% to 40% halves it again. Components may not add exactly because of rounding. Two lessons follow:

• Small differences in the rate are large differences in value. A five-point disagreement between an appraiser and an auditor is not a rounding issue. It can move the common stock price materially.
• The rate and the terminal value interact. In the Gordon growth formula, the terminal value depends on the gap between the rate and long-term growth. A lower rate both raises the terminal value and discounts it less.

This sensitivity is one reason many early-stage 409A reports give the DCF limited weight or skip it. Our guide to 409A valuation methods for pre-revenue startups covers what appraisers use instead when a forecast is too speculative to discount.

Three Ways to Build a 409A Discount Rate

There is no single formula for the cost of capital 409A DCF models use. Appraisers draw on a few established methods, often running more than one and reconciling the results. The table summarizes them.

The first three methods build a rate from market data upward. The venture capital approach works from what investors in companies like this one actually target. Calibration works backward from what investors in this company actually paid. A strong report usually shows at least two of these and explains where the concluded rate sits.

CAPM and the Modified CAPM

The capital asset pricing model (CAPM) sets the cost of equity as the risk-free rate plus beta times the equity risk premium. Beta measures how much a stock moves with the market, and it is taken from guideline public companies, with each peer's beta adjusted to remove the effect of its debt and then reapplied at the subject's capital structure.

Plain CAPM assumes a diversified investor who only needs to be paid for market risk. That fits a large public company. It does not fit a startup, where the main risks are specific to the company: will the product find a market, will the next round close, will the team execute? So appraisers add two premiums to get a modified CAPM:

• A size premium for the extra return small companies have historically earned beyond what beta explains, usually taken from published size studies for the smallest public companies.
• A company-specific risk premium for risks not captured elsewhere, such as customer concentration, a short operating history, key-person dependence or limited runway.

An illustrative modified CAPM build for a Series B software company might look like this:

Notice that the company-specific premium is the largest single piece and the hardest to evidence. That is where reviewers focus. A premium of 12 points should be tied to named risks in the report, not presented as a plug.

The Build-Up Method

The build-up method reaches a similar result without beta. It stacks the risk-free rate, the equity risk premium, a size premium and a company-specific premium, and sometimes an industry premium. Appraisers use it when there are no public peers with a meaningful beta, which is common for startups in new categories.

Because each layer is stated separately, the build-up method is easy to read. Its weakness is the same as the modified CAPM's: the company-specific layer carries most of the startup risk, and it rests on judgment. Some appraisers break that layer into scored factors (product stage, revenue history, management depth, capital needs) so a reader can see where each point came from.

Venture Capital Rates of Return by Stage

The venture capital approach starts from a different place. Instead of building up from public market data, it asks what return venture investors target for a company at this stage. The AICPA's accounting and valuation guide on privately held company equity securities issued as compensation summarizes several studies of these target rates. Two commonly cited sets are shown below.

These rates are useful because they come from the investors who actually price startup risk. They come with an important caveat, which the AICPA guide itself discusses: venture capitalists typically apply them to the founders' success-case projections. The high rate does two jobs at once. It prices the risk of the business, and it haircuts a forecast that assumes everything goes to plan.

If the forecast in the 409A has already been adjusted, for example by weighting a success case against a slower-growth case and a failure case, applying a 60% venture capital rate on top would count the same risk twice. In that situation, appraisers use a lower rate. This is why concluded 409A discount rates for venture-backed companies with real revenue often land around 25% to 45%, below the headline venture capital figures.

Why are discount rates for early-stage startups so high?

Early-stage discount rates are high because the cash flows are uncertain in ways a public company's are not. Most startups never reach their forecast, many fail outright, and investors must be paid for that risk. A rate of 30% or more also absorbs the optimism usually built into management projections.

It helps to break the gap between a 10% public company rate and a 35% startup rate into its parts:

• Survival risk. A DCF assumes the business keeps operating. If there is a real chance it runs out of money, either the forecast includes that outcome or the rate has to.
• Execution and market risk. The forecast depends on hiring, product launches and sales that have not happened yet.
• Financing risk. Most startups need more capital to reach the forecast, and the next round may come at a lower price or not at all.
• Forecast bias. Projections prepared for fundraising tend to be optimistic. The rate is often the only place that bias is corrected.

One thing the rate should not include is illiquidity of the common stock. A 409A applies a separate discount for lack of marketability at the share level. If the discount rate also has a premium for the fact that the shares cannot be sold, the same risk is counted twice and common stock is undervalued.

Matching the Rate to the Cash Flows

The most common technical error in a startup DCF is a rate that does not match the forecast it is applied to. Reviewers check four pairings:

1. Enterprise vs equity. Unlevered free cash flow goes with WACC; cash flow to equity goes with the cost of equity. Mixing them misstates value. For a startup with no debt, the two rates converge.
2. Success case vs expected case. A single optimistic forecast goes with a venture-style rate. A probability-weighted forecast goes with a lower, CAPM-style rate. The report should say which it is.
3. Nominal vs real. Forecasts in today's dollars need a rate without inflation. Almost all startup forecasts are nominal, so the rate should be nominal too, which it is when built from a Treasury yield.
4. Terminal growth vs rate. Long-term growth must be well below the discount rate and should be sustainable for a mature company, typically near long-term inflation plus modest real growth.

Some appraisers also step the rate down over the forecast, using a higher rate for near-term years and a lower rate for the terminal period, on the view that the company will be less risky once it reaches maturity. That is a defensible choice when explained, and it raises value relative to a single flat rate.

How do you know if a 409A discount rate is reasonable?

A reasonable 409A discount rate is supported by at least two methods, matches the cash flows it is applied to, and produces a DCF value that agrees with other evidence. The strongest test is calibration: the rate that makes the DCF equal the value implied by a recent arm's-length financing.

Calibration works like this. Suppose the company's latest round, run through a backsolve, implies an equity value that, after removing net cash, corresponds to an enterprise value of about $12.0M. Using the forecast from our sensitivity table, the rate that produces that value is about 25%. That implied rate is what the round's investors effectively priced in. If a modified CAPM build gives 29%, the gap is small and explainable. If it gives 45%, either the forecast or the build-up needs another look.

Other checks reviewers apply:

• Agreement with the market approach. If the DCF and the guideline company or transaction methods differ widely, the rate is one of the first inputs examined.
• Consistency with stage. A pre-IPO company at 50% or a seed company at 18% will need a strong explanation.
• Sourced inputs. The risk-free rate, equity risk premium and size premium should each name their source and date.
• Consistency over time. The rate should fall as the company de-risks, and changes between reports should follow changes in facts.

What Auditors and the IRS Look for in the Discount Rate

Treasury Regulations Section 1.409A-1(b)(5)(iv)(B)(1) lists the factors a reasonable valuation method considers. They include the present value of anticipated future cash flows, the market value of similar companies and recent arm's-length transactions in the company's stock. The regulations do not prescribe a discount rate or a method for setting one. The AICPA guide discusses the methods above without mandating any of them.

In practice, an auditor reviewing the 409A for ASC 718 stock compensation, or an IRS examiner, will look for a named method, sourced market inputs, a company-specific premium tied to stated risks, a clear match between the rate and the forecast, and a cross-check against the latest financing. Our guide to audit-defensible 409A valuations covers the documentation that supports each of these.

The rate also matters for safe harbor. A valuation by a qualified independent appraiser, as of a date no more than 12 months before the grant, is presumed reasonable under Section 1.409A-1(b)(5)(iv)(B)(2)(i), and the IRS can overcome that presumption only by showing the valuation is grossly unreasonable. An unsupported rate weakens the defense. If options are granted with an exercise price below fair market value and no exemption applies, they can be treated as deferred compensation subject to Section 409A. If they then fail to comply, the holder may owe income tax on vested amounts, an additional 20% tax and premium interest. See our 409A safe harbor guide for the full rules.

The Bottom Line on the 409A Discount Rate

The 409A discount rate is where the risk of a startup forecast gets priced. CAPM and the build-up method build it from market data, venture capital rates show what investors in similar companies target, and calibration shows what investors in this company actually paid. A good report uses more than one, explains the company-specific premium, and makes sure the rate fits the forecast it discounts.

When you read your report, find the rate, the method behind it and the forecast it was applied to. Check whether the DCF value agrees with your latest round and with the market approach. For how much weight the DCF should carry in the first place, see our guide to the income, market and cost approaches, and for the full picture of how the report fits together, our overview of 409A valuation methodology.

The figures in this article are illustrative, based on simplified inputs, and are not a valuation of any company. Published venture capital return ranges are approximate and drawn from older studies; appraisers should consult the original sources and current data. This article is general information about Section 409A and valuation practice, not legal, tax or accounting advice. Whether a valuation qualifies for a presumption of reasonableness under Treasury Regulations Section 1.409A-1(b)(5)(iv)(B) depends on the specific facts; consult your own counsel and tax advisor.