In discounted cash flow (DCF) valuation, the discount rate is the required rate of return used to convert future cash flows to present value — typically set equal to WACC for enterprise valuations or a project-specific hurdle rate for capital budgeting. The SEC requires public companies to disclose discount rate assumptions in impairment testing under FASB ASC 350.
The discount rate in a DCF model represents the minimum acceptable return an investor or lender requires, reflecting the opportunity cost of capital and the risk of the specific cash flows being valued. For business enterprise valuation, the discount rate is most commonly set to WACC — the blended required return of all capital providers (debt and equity). For project-level analysis, it may be a 'hurdle rate' set above WACC to account for project-specific risk. Formula: Present Value = Future Cash Flow / (1 + Discount Rate)^n. Higher discount rates make future cash flows worth less today — meaning riskier businesses (higher required returns) are worth less for a given cash flow stream. Regulatory context: FASB ASC 350 (Intangibles — Goodwill and Other, https://www.fasb.org/standards/accounting-standards-updates/2017-04-intangibles-goodwill-and-other-simplifying-the-test-for-goodwill-impairment-topic-350) requires public companies to perform annual goodwill impairment testing using a discounted cash flow approach. The SEC's comment letter program (https://www.sec.gov/cgi-bin/browse-edgar) frequently challenges companies on their discount rate assumptions — too low a discount rate inflates asset values and delays impairment charges. For SMB financing decisions: business owners implicitly use a discount rate when evaluating whether to take on debt. If a $100K loan at 12% APR is deployed into a project expected to return 25% annually, the net present value is positive — the discount rate (cost of capital) is below the project return. If the project return is 10% against a 12% cost of debt, NPV is negative — the project destroys value. This is DCF thinking applied practically to every capital allocation decision. Common discount rates by context: risk-free rate (10-year Treasury, ~4-5% as of 2024, per FRED at https://fred.stlouisfed.org/series/DGS10); WACC for established mid-market businesses 8-12%; venture/high-growth businesses 20-30%+; real estate 6-10%.
For small businesses, a practical approach: set the discount rate equal to your weighted average cost of capital (WACC) — the blended rate you pay across all debt and equity. If you mostly use business debt at 8-12% interest, use that range as your floor. Add a premium for project risk above baseline business risk. Many SMB operators use 12-20% as a practical hurdle rate — high enough to filter out marginal projects while remaining achievable for good investments.
Discount rate and valuation move in opposite directions — higher discount rate, lower present value for the same cash flow stream. A 1 percentage point increase in discount rate on a 5-year DCF typically reduces present value by 4-6%. This is why rising interest rates (which increase WACC) tend to compress business valuations: future cash flows are worth less at higher required returns.
Related but not identical. The interest rate on a loan is the lender's required return on debt capital — it's one input into WACC. The DCF discount rate equals the full WACC (blended debt + equity cost) or a project-specific hurdle rate. For a business funded 50% debt at 8% and 50% equity at 15%, WACC ≈ 11.5% — which becomes the discount rate for enterprise DCF, not the 8% debt rate alone.