Discount rate
What is Discount rate?
A discount rate converts future cash flows into present value and should reflect timing, currency, inflation basis, and risks not already captured in the cash flows.
Why discount rates matter
A dollar received later is worth less than one received today because capital has an opportunity cost and future payment is uncertain. Higher discount rates reduce present value, especially for distant cash flows. The rate is not a discretionary penalty applied after forecasting; it must be derived consistently with the claim and risk represented by the modeled cash flows.
Matching rate and cash flow
FCFF is generally discounted at WACC, while FCFE or dividends use cost of equity. Nominal cash flows use nominal rates in the same currency, and real cash flows use real rates. Risks should be reflected in cash flows, the discount rate, or a coherent combination without omission or double counting.
Example
A certain $100 payment in one year discounted at 5% has present value of about $95.24. At 10%, value is about $90.91. For an uncertain operating cash flow, the appropriate rate depends on systematic risk and claim priority. Simply adding arbitrary premiums can duplicate downside already included in probability-weighted cash flows.
How to interpret it
Break the rate into observable and estimated components, including risk-free curve, beta or factor exposure, market premium, debt cost, capital weights, and country risk where relevant. Use a term structure when timing matters. Test sensitivity and compare the rate with market-implied assumptions without treating any single model as objective truth.
Limitations
Required returns are unobservable and model-dependent. Historical premiums vary by period, beta is unstable, and capital structure changes over time. A constant rate can be inappropriate when risk changes across forecast stages. Company-specific risks that can be diversified should not automatically receive arbitrary premiums under every framework.
Practical checklist
State valuation date, currency, nominal or real basis, claim, horizon, and formula. Match cash flows and rates, avoid double counting, and update market inputs consistently. Use scenario or probability-weighted cash flows for asymmetric risks where appropriate. Publish sensitivities and ensure terminal discount rate reflects the stable business rather than the current transitional state.
Sources and further reading
- Present Value Measurements and Discount Rates, IFRS Foundation