HKMA Physical Risk Assessment for Banks: Climate Change Impact on Loan Portfolios

The Hong Kong Monetary Authority (HKMA) has made physical climate risk a supervisory priority for 2025-2026. Following the release of its Supervisory Policy Manual module on climate risk management in 2023, the HKMA now expects all authorized institutions to integrate physical risk stress testing into their core credit approval and loan portfolio monitoring processes. The immediate trigger is the increasing frequency of extreme weather events in the Guangdong-Hong Kong-Macao Greater Bay Area and key Southeast Asian supply chain hubs, which directly impacts collateral values, business continuity, and borrower repayment capacity. Banks that fail to quantify and disclose their exposure to typhoon, flood, and heat stress scenarios face potential capital add-ons and supervisory sanctions under the HKMA’s revised Supervisory Review Process. This article outlines the regulatory framework, the specific assessment methodology the HKMA expects, and the practical steps for compliance officers to implement a defensible physical risk assessment for loan portfolios.

The HKMA’s Regulatory Framework for Physical Climate Risk

The HKMA’s Supervisory Policy Manual (SPM) module CR-G-1, issued in December 2023, sets out the minimum standards for climate risk management. The module requires authorized institutions to identify, measure, monitor, and control both transition risks and physical risks. Physical risk refers to the financial impact from acute events (typhoons, floods, wildfires) and chronic shifts (sea-level rise, temperature increases, water scarcity).

Step 1: Scope of Application for All Licensed Banks

The SPM module applies to all authorized institutions under the Banking Ordinance (Cap. 155). The HKMA does not exempt smaller banks. Institutions with loan portfolios concentrated in sectors such as real estate, infrastructure, shipping, logistics, and agriculture face the highest supervisory scrutiny. The HKMA’s 2024 Climate Risk Stress Test (CRST) exercise covered 28 major banks, representing over 80% of total banking assets in Hong Kong. The results, published in October 2024, showed that physical risk could reduce the value of collateralized property portfolios by 12-18% under a severe scenario by 2050.

Step 2: The Three-Line-of-Defence Model

The HKMA mandates that climate risk governance follows the same three-line-of-defence structure as credit risk. The first line is the business unit, responsible for identifying physical risk at origination. The second line is the risk management function, which validates scenario assumptions and conducts independent portfolio stress tests. The third line is internal audit, which must verify the integrity of physical risk data and model outputs at least annually. The HKMA’s 2025 thematic examination will focus on whether the second line has adequate quantitative expertise, not just qualitative policy documentation.

Methodology for Physical Risk Assessment of Loan Portfolios

The HKMA expects banks to apply a location-based, sector-weighted methodology. The regulator has provided a reference framework through its 2023 white paper “Climate Risk Stress Testing for the Hong Kong Banking Sector,” which outlines the use of the Network for Greening the Financial System (NGFS) scenarios.

Step 1: Data Collection and Exposure Mapping

Banks must first map the geographic location of all material collateral and borrower operations. This includes property addresses, factory locations, and major supplier sites. The HKMA requires granularity at the district level for Hong Kong and the province level for Mainland China exposures. For example, a bank with a loan secured by a warehouse in Kwai Tsing must assess that district’s flood risk under a 1-in-100-year rainfall event scenario. The HKMA’s 2024 CRST exercise used the Hong Kong Observatory’s Climate Projection for Hong Kong dataset, which projects a 3-5% increase in annual maximum rainfall intensity by 2040.

Step 2: Scenario Selection and Time Horizons

The HKMA mandates at least two scenarios: a baseline scenario consistent with the Paris Agreement (RCP 2.6) and an adverse scenario (RCP 8.5) with high emissions and limited adaptation. Banks must assess physical risk over three time horizons: short-term (2025-2030), medium-term (2030-2040), and long-term (2040-2050). For each scenario, the bank must calculate the probability of default (PD) and loss given default (LGD) adjustments. The HKMA’s guidance states that for properties in designated flood-prone zones, the LGD haircut should be no less than 15% under the adverse scenario by 2030.

Step 3: Quantification of Portfolio Impact

The final step is to aggregate the impact across the loan portfolio. The HKMA requires banks to report two key metrics: the Physical Risk Value-at-Risk (VaR) at the 95th percentile and the increase in expected credit losses (ECL) under IFRS 9. For example, a bank with a HK$10 billion property development loan book in the New Territories must calculate the additional ECL from a 1-in-50-year typhoon event. The HKMA’s 2024 CRST results indicated that the aggregate physical risk ECL for the sampled banks could reach HK$8-12 billion by 2040 under the adverse scenario.

Practical Compliance Steps for 2025-2026

The HKMA has signaled that the 2025-2026 supervisory cycle will include targeted on-site examinations of physical risk management. The following steps are based on the HKMA’s published expectations and industry best practices observed in the 2024 CRST.

Step 1: Gap Analysis Against the SPM Module

Compliance officers should conduct a formal gap analysis comparing their current physical risk assessment framework against the requirements of SPM CR-G-1. The analysis must cover data availability, model capability, governance structure, and disclosure. The HKMA expects a written report to the board of directors by Q2 2025. Institutions that identify material gaps must submit a remediation plan with specific milestones and a target completion date no later than Q4 2025.

Step 2: Integration into the Credit Approval Process

Physical risk assessment must be embedded into the standard credit approval workflow. For new loan applications, the relationship manager must complete a physical risk screening form. For existing loans, the bank must conduct a portfolio-level screening at least annually. The HKMA’s 2024 thematic review found that 40% of banks still treat physical risk as a standalone exercise, not an integrated credit factor. This is a supervisory deficiency. The credit approval authority must explicitly consider the physical risk score when setting the loan-to-value ratio and covenant conditions.

Step 3: Disclosure and Reporting

The HKMA expects authorized institutions to disclose their physical risk exposure in their annual Pillar 3 reports. The disclosure must include the total loan value exposed to high physical risk zones, the scenarios used, and the estimated ECL impact. The HKMA’s 2025 Supervisory Review Process will assess whether disclosures are consistent with the Task Force on Climate-related Financial Disclosures (TCFD) recommendations. Banks that fail to provide meaningful disclosure risk a higher Pillar 2 capital requirement. The HKMA has the authority under section 68 of the Banking Ordinance (Cap. 155) to impose additional capital charges for inadequate risk management.

Actionable Takeaways

1. Complete a gap analysis against SPM CR-G-1 by Q2 2025 and submit a remediation plan to the board with a Q4 2025 deadline for closure.
2. Embed a location-based physical risk screening into the credit origination workflow for all new loans in the real estate, logistics, and manufacturing sectors.
3. Use the Hong Kong Observatory’s Climate Projection for Hong Kong dataset and the NGFS scenarios for your 2025 stress test submission.
4. Apply a minimum 15% LGD haircut to collateral in flood-prone zones under the adverse scenario, as recommended by the HKMA’s 2024 CRST methodology.
5. Prepare a board-level disclosure report on physical risk exposure for the 2025 Pillar 3 report, ensuring alignment with TCFD recommendations.

This does not constitute legal advice. Consult a solicitor for your specific case.