The CIL/S106 Cost Certainty Ratio assesses the accuracy of budget forecasts for Section 106 planning obligations and Community Infrastructure Levy (CIL) charges within a UK property development finance project. It compares the projected costs agreed during financial planning to the actual amounts incurred during delivery. A high ratio indicates strong budget accuracy, minimising unplanned expenditure and reducing risks to project profitability. This ratio is particularly relevant for developers seeking to control costs linked to planning obligations, as inaccurate forecasting can impact loan covenants, contingency planning, and overall project financial performance.
This sits beneath Budget Accuracy & Variance, introducing a more specific variant of the measure without changing its core interpretation. It is commonly considered alongside CIL / S106 Burden Ratio, as both are closely related measures used to assess similar aspects of performance or risk.
View glossary entry