Increase in insurance costs due to nature-related loss and damage
Measurement answer
What this metric measures
Reports the percentage increase in insurance costs, relative to the prior reporting period, attributed to nature-related loss and damage events.
Specification
Metric specification
- Result format
- Single value
- Unit
- percent — source-defined reporting unit
- Reporting basis
- Current reporting period compared with the prior reporting period
- Aggregation
- Percentage change in insurance costs attributable to nature-related loss and damage across the reporting entity's reported boundary
- Pillar
- Environmental
- Topic
- Nature-related financial impacts
- Controlled domain
- Sustainable finance
- Entity type
- Metric
Reporting boundary
Reporting entity insurance costs attributable to nature-related loss and damage events
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting Disclosurer010
TNFD LEAP approach
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.1, October 2023
- Requirement
- Not Specified
- Relationship
- Reuses Canonical Metric
- Mapping outcome
- Reused
- Source locator
- TNFD LEAP Approach v1.1, Annex 1, Table 26, PDF page 173, metric row 2
- Adopting DisclosureSource evidence
TNFD Recommendations
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- September 2023
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- Page 94, Table 9, A8.3
- Adopting Disclosure37dd0b58b5d33155dc8f
TNFD Recommendations
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- September 2023
- Requirement
- Not Specified
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- Page 94, Table 9, A8.3
Value structure
Dimensions and units
- Unit
- percent — source-defined reporting unit
- Reporting basis
- Current reporting period compared with the prior reporting period
Unit meaning: Values use percent under the disclosed TNFD Recommendations method, period, location and reporting boundary.
Published dimensions
- reporting period
- prior reporting period
- nature-related loss and damage attribution
- reporting entity boundary
Calculation method
Formula information
- Status
- Specified
- Formula type
- Percentage
Formula
((C_current - C_prior) / C_prior) × 100Apply the source-defined TNFD Recommendations method only within the disclosed location, ecosystem and value-chain boundary. A8.3 specifies a reportable percentage increase in insurance expenses relative to the prior year and identifies the required attribution to nature-related loss and damage. It is a standalone financial-impact metric, retained as an Annex 2 optional additional metric and not treated as a core acceptance gate.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
C_current | Current-period attributable insurance costs | Insurance costs in the current reporting period attributed to nature-related loss and damage events. | currency |
C_prior | Prior-period attributable insurance costs | Insurance costs in the prior reporting period attributed to nature-related loss and damage events, measured on a comparable basis. | currency |
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 27 August 2026
Recommendations of the Taskforce on Nature-related Financial Disclosures
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- September 2023
- Locator
- Page 94, Table 9, A8.3
Supports: The official TNFD Recommendations source supports the identity, boundary and method basis of “Increase in insurance costs due to nature-related loss and damage”.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: Recommendations of the Taskforce on Nature-related Financial Disclosures, September 2023.
- Define insurance costs included in the metric and the reporting-entity boundary.
- Describe the method, evidence, assumptions, and judgement used to attribute insurance costs and their change to nature-related loss and damage events.
- Disclose the current- and prior-period insurance-cost values used as the comparison basis, including treatment of a zero or immaterial prior-period value.
- State whether changes in insurance coverage, deductibles, premiums, claims experience, or portfolio composition affected comparability.
Record-specific limitations
- The metric depends on the entity's attribution of insurance-cost changes to nature-related loss and damage events.
- A percentage change can be unstable or not meaningful where prior-period attributable insurance costs are zero or immaterial.
- TNFD presents A8.3 as an optional additional metric in Annex 2, rather than an Annex 1 core global metric.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.