A finance and accounting concept defining a method, measure, or process used to record activity and support financial decisions. It specifies how value, risk, or performance is measured or controlled through standardized rules and routines. It does not ensure correctness without reliable inputs, appropriate assumptions, and effective review and controls. It materially affects decisions and compliance by shaping how organizations allocate capital, report results, and manage exposure. The concept is generally stable, though standards, regulation, and tools evolve over time.

Principle

When markets do not provide observable inputs, construct valuation inputs from the best available internal information and assumptions that reflect what market participants would use, while documenting uncertainty and sensitivity.

Demonstration

Valuing a complex private equity interest using discounted cash flow projections based on management's forecasts of revenue growth, margins, and a discount rate calibrated partly by market proxies—these unobservable assumptions are Level 3 inputs.

Misapplication

Masking optimistic or unsupported management estimates as Level 3 without reasonable market-based corroboration, or failing to disclose key sensitivities and the range of outcomes tied to those inputs.

Consequence

Reliance on Level 3 increases measurement subjectivity and model risk, requires robust governance, independent review, and enhanced disclosure of inputs, methods, and sensitivity to support user understanding.

Reversal

The opposite is reliance on observable market prices (Level 1) or market-derived inputs (Level 2) where subjectivity is limited and market evidence dominates the valuation.

Boundary

Applies only when observable inputs are not available or insufficient; excludes inputs that are actually observable or that can be reasonably derived from market data with limited adjustments.

Semantic Tension

Tension exists between necessary managerial forecasting and the desire for market-based validation; distinguishing legitimately unobservable inputs from poorly supported assumptions is often judgmental and fact specific.

Synthesis

Level 3 inputs are internally generated, unobservable assumptions used when markets provide no direct evidence; they enable valuation where data are scarce but demand strict documentation, governance, and transparent disclosure of uncertainty.