Capital Structure Optimisation and Credit Ratings: How Moody's and S&P View Hong Kong Corporate Leverage

The divergence between Moody’s Ratings and S&P Global Ratings on the appropriate leverage ceiling for Hong Kong-listed corporates has widened into a material consideration for CFOs planning 2025-2026 refinancing cycles. Moody’s April 2025 recalibration of its “Baa3” rating methodology for Greater China real estate and infrastructure groups introduced a stricter net debt/EBITDA threshold of 4.5x for a stable outlook, down from 5.0x previously. S&P, by contrast, maintained its 5.5x ceiling for the equivalent “BBB-” rating in its June 2025 Hong Kong corporate methodology update, citing the region’s deeper bond market liquidity and shorter refinancing tenors. This 100-basis-point gap directly impacts the cost of capital for issuers such as CK Hutchison Holdings and MTR Corporation, where a one-notch downgrade can increase annual interest expense by 15-20 bps on a 5-year USD bond. With HKD 1.2 trillion in Hong Kong dollar and USD-denominated bonds maturing between Q4 2025 and Q4 2026 (HKMA Bond Market Data, September 2025), the choice of which rating agency to engage—and how to calibrate capital structure to its specific metric—is no longer an academic exercise. This article examines the methodology differences, the regulatory context under HKEX Listing Rules, and the practical levers available to Hong Kong CFOs.

The Methodology Gap: Where Moody’s and S&P Diverge

The 100-bps gap in net leverage tolerance is not an arbitrary difference. It stems from each agency’s distinct treatment of hybrid capital, operating lease capitalisation, and the cyclicality adjustment factor applied to Hong Kong’s service-oriented economy.

Hybrid Capital and Equity Credit

Moody’s assigns a 50% equity credit to qualifying hybrid instruments issued by Hong Kong corporates, provided the instrument has a minimum 60-year tenor and a 5-year non-call period. S&P applies a more generous 75% equity credit for hybrids meeting its “intermediate equity content” criteria, which requires a 20-year minimum tenor and a mandatory interest deferral mechanism. For a typical HKD 5 billion hybrid issuance by a Hong Kong property developer, this 25-percentage-point difference in equity credit can shift the agency’s computed adjusted debt by HKD 1.25 billion. Under Moody’s methodology, that HKD 5 billion hybrid adds HKD 2.5 billion to adjusted debt; under S&P, it adds only HKD 1.25 billion. The impact on net debt/EBITDA for a firm with HKD 10 billion in EBITDA is a 0.125x increase under Moody’s versus a 0.0625x increase under S&P—a difference that can determine whether the ratio crosses the 4.5x threshold.

Operating Lease Capitalisation

S&P capitalises operating leases at 8x annual lease expense for Hong Kong retail and office tenants, reflecting the region’s typical 8-year lease terms. Moody’s uses a 5x multiple for the same sector, arguing that Hong Kong’s shorter lease renewal cycles (averaging 3-5 years for retail) warrant a lower capitalisation factor. For a major Hong Kong landlord with HKD 2 billion in annual lease expenses, S&P’s methodology adds HKD 16 billion to adjusted debt; Moody’s adds only HKD 10 billion. The HKD 6 billion difference represents 0.6x of EBITDA for a firm with HKD 10 billion in EBITDA, potentially flipping the leverage assessment from “adequate” to “aggressive” under Moody’s while remaining “moderate” under S&P. CFOs must model both scenarios when presenting to credit committees.

Cyclicality Adjustment

Moody’s applies a 1.2x cyclicality multiplier to Hong Kong’s GDP growth volatility when computing its “through-the-cycle” EBITDA for rating purposes, citing the territory’s 3.2% GDP growth standard deviation over 2015-2024 (Census and Statistics Department data). S&P uses a 1.0x multiplier, arguing that Hong Kong’s status as an international financial centre provides a structural buffer that reduces cyclicality. For a Hong Kong conglomerate with reported EBITDA of HKD 15 billion, Moody’s through-the-cycle EBITDA would be HKD 12.5 billion (HKD 15 billion divided by 1.2), while S&P would use the full HKD 15 billion. This HKD 2.5 billion difference translates directly into leverage ratio calculations, with Moody’s seeing a 20% higher net debt/EBITDA than S&P for the same absolute debt level.

Regulatory Context and Listing Rule Implications

The choice of rating agency and the resulting credit rating have direct consequences under HKEX Listing Rules, particularly for issuers with listed debt securities or those planning equity-linked transactions.

HKEX Listing Rule 7.22 and Credit Rating Triggers

HKEX Listing Rule 7.22 requires issuers of listed debt securities to disclose any material change in their credit rating within 2 business days. A downgrade of one notch or more by either Moody’s or S&P constitutes a “material change” under the rule, triggering an immediate filing obligation. In 2024, 14 Hong Kong-listed issuers filed such disclosures, with 8 citing Moody’s downgrades and 6 citing S&P actions (HKEX Filing Database, 2024). The disclosure must include the specific rating action, the effective date, and the issuer’s response plan. CFOs should prepare pre-drafted filings for both Moody’s and S&P downgrade scenarios, as the 2-business-day window leaves little room for drafting.

Impact on Margin Lending and Collateral Calls

Many Hong Kong margin lending agreements reference the higher of the two agency ratings for determining loan-to-value (LTV) ratios. A typical facility letter for a HKD 500 million secured loan to a Hong Kong-listed company might specify an LTV of 60% if the higher rating is “BBB-” or above, dropping to 50% if it falls to “BB+”. Because Moody’s “Baa3” is equivalent to S&P’s “BBB-” in the notching scale, a divergence between the two ratings—such as Moody’s at “Baa3” and S&P at “BBB-”—does not trigger a change. However, if Moody’s downgrades to “Ba1” while S&P remains at “BBB-”, the higher rating remains “BBB-”, and the LTV stays at 60%. The risk arises when both agencies downgrade, or when the higher-rated agency downgrades below the trigger threshold. CFOs should negotiate margin lending agreements to reference the higher rating, not an average or the lower rating, to preserve borrowing capacity.

Bond Covenant and Change-of-Control Provisions

Standard Hong Kong bond indentures often include a “rating decline” clause that triggers an increased coupon of 25-50 bps if the issuer’s credit rating drops by two or more notches within a 90-day period. The definition of “credit rating” in these indentures typically refers to the rating assigned by either Moody’s or S&P, not both. Issuers with a split rating—Moody’s at “Baa2” and S&P at “BBB-”—face a lower risk of triggering the clause because only one agency needs to downgrade. However, if the indenture specifies “the higher of the two ratings,” a Moody’s downgrade from “Baa2” to “Baa3” (one notch) does not trigger the clause, but a further downgrade to “Ba1” (two notches from “Baa2”) would. CFOs must audit all bond indentures to identify the exact rating reference language and model the probability of a two-notch downgrade under each agency’s methodology.

Practical Levers for Capital Structure Optimisation

Given the methodology differences, Hong Kong CFOs have several levers to optimise their capital structure for a target rating under either agency’s framework.

Hybrid Capital Issuance Timing

Issuers seeking to maintain a “BBB-” rating from S&P should consider issuing hybrid capital in the first half of 2026, when market conditions are expected to remain accommodative. The 75% equity credit under S&P’s methodology means that a HKD 3 billion hybrid issuance reduces adjusted debt by HKD 2.25 billion compared to straight debt. For a firm with HKD 8 billion in EBITDA, this reduces net debt/EBITDA by 0.28x, potentially bringing the ratio from 5.8x to 5.52x—just below S&P’s 5.5x ceiling. Under Moody’s, the same HKD 3 billion hybrid reduces adjusted debt by only HKD 1.5 billion, lowering net debt/EBITDA by 0.19x, from 5.8x to 5.61x—still above Moody’s 4.5x ceiling. The choice of agency thus determines whether hybrid issuance is a viable solution.

Asset Sales and Proceeds Application

S&P gives full debt reduction credit for asset sale proceeds applied to debt repayment within 12 months, while Moody’s applies a 50% haircut if the asset sold is considered “non-core” under its definition. For a Hong Kong conglomerate selling a HKD 10 billion non-core asset, S&P would reduce adjusted debt by the full HKD 10 billion, lowering net debt/EBITDA by 1.0x. Moody’s would reduce adjusted debt by only HKD 5 billion, lowering net debt/EBITDA by 0.5x. The difference of 0.5x can determine whether the ratio falls below the 4.5x threshold. CFOs should classify asset sales as “core” disposals where possible, and provide detailed justification to Moody’s to minimise the haircut.

Dividend Policy and Share Buybacks

Moody’s penalises aggressive dividend payout ratios above 50% of net income by adding a 0.25x leverage penalty to its net debt/EBITDA calculation. S&P has no such penalty, provided the dividend is covered by free cash flow after capex. For a Hong Kong utility with HKD 5 billion in net income and a 60% payout ratio, Moody’s would add HKD 1.25 billion to adjusted debt (0.25x of HKD 5 billion), increasing net debt/EBITDA by 0.125x. S&P would not apply any adjustment. CFOs targeting a Moody’s rating should cap dividends at 50% of net income, while those targeting S&P can maintain higher payouts if free cash flow coverage is adequate.

Refinancing Tenor and Maturity Ladder

Moody’s applies a 0.5x leverage penalty for issuers with more than 20% of total debt maturing within 12 months, reflecting refinancing risk. S&P applies a 0.3x penalty for the same threshold. For a Hong Kong property developer with HKD 40 billion in total debt and HKD 10 billion maturing in the next 12 months (25% of total), Moody’s would add HKD 5 billion to adjusted debt (0.5x of HKD 10 billion), increasing net debt/EBITDA by 0.5x. S&P would add HKD 3 billion (0.3x of HKD 10 billion), increasing the ratio by 0.3x. Extending maturities to reduce the 12-month refinancing requirement below 20% eliminates both penalties. CFOs should prioritise terming out short-dated debt in the 2026 refinancing window.

Sector-Specific Considerations for Hong Kong Issuers

The methodology differences have distinct implications for three major Hong Kong sectors: property developers, infrastructure operators, and financial institutions.

Property Developers: The Leverage Ceiling Divergence

Hong Kong property developers face the widest gap between Moody’s and S&P leverage tolerances. Moody’s “Baa3” threshold for developers is 4.0x net debt/EBITDA, while S&P’s “BBB-” threshold is 5.0x. The 1.0x difference reflects Moody’s view that Hong Kong developers face higher cyclicality from land auction costs and sales volume volatility. For a developer like Sun Hung Kai Properties, which reported net debt/EBITDA of 4.5x for FY2024, Moody’s would assign a “Ba1” rating (one notch below investment grade), while S&P would assign a “BBB-” rating (lowest investment grade). The cost of capital difference between “Ba1” and “BBB-” is approximately 25-30 bps on a 5-year USD bond, translating to HKD 12.5-15 million in additional annual interest expense on a HKD 500 million issuance. Developers should target S&P as their primary agency if their leverage is between 4.0x and 5.0x.

Infrastructure Operators: Hybrid Capital Advantage

Hong Kong infrastructure operators, such as MTR Corporation and Power Assets, benefit most from the hybrid capital equity credit differential. These firms typically have stable cash flows and moderate leverage, making them ideal candidates for hybrid issuance. Under S&P’s 75% equity credit, a HKD 4 billion hybrid issuance by MTR would reduce adjusted debt by HKD 3 billion, lowering net debt/EBITDA from 3.5x to 3.2x. Under Moody’s 50% equity credit, the same issuance would reduce adjusted debt by HKD 2 billion, lowering the ratio from 3.5x to 3.3x. While both ratios remain within investment grade thresholds, the S&P treatment allows for a larger issuance size without breaching the 4.5x ceiling. Infrastructure CFOs should structure hybrids to meet S&P’s intermediate equity content criteria, which requires a 20-year tenor and mandatory interest deferral.

Financial Institutions: The Regulatory Capital Overlay

Hong Kong-incorporated banks and insurance companies face an additional layer of complexity: the HKMA’s capital adequacy framework under the Banking Ordinance (Cap. 155). The HKMA requires banks to maintain a Common Equity Tier 1 (CET1) ratio of at least 4.5% under Basel III, with an additional countercyclical capital buffer of 1.0% for Hong Kong exposures. Moody’s and S&P incorporate these regulatory requirements into their bank rating methodologies, but with different weightings. Moody’s assigns a 20% weight to regulatory capital adequacy in its BCA (Baseline Credit Assessment), while S&P assigns a 15% weight. For a Hong Kong bank with a CET1 ratio of 5.5%, Moody’s would view this as a strength, while S&P would consider it adequate but not exceptional. The difference can result in a one-notch gap between the two agencies’ bank ratings. CFOs of financial institutions should maintain a CET1 ratio above 6.0% to ensure a consistent investment grade rating from both agencies.

Actionable Takeaways for Hong Kong CFOs

1. Engage both Moody’s and S&P in pre-issuance dialogue 90 days before any bond or hybrid offering, providing a detailed capital structure model that demonstrates compliance with each agency’s specific leverage thresholds, not a generic financial projection.

2. Negotiate margin lending agreements and bond indentures to reference the higher of the two agency ratings, preserving borrowing capacity and avoiding automatic coupon step-ups when one agency downgrades but the other does not.

3. Target a net debt/EBITDA of 4.0x or below if seeking a Moody’s investment grade rating, or 5.0x or below for S&P, and use hybrid capital strategically to bridge the gap—but only if the hybrid is structured to maximise equity credit under the target agency’s methodology.

4. Extend debt maturities to ensure no more than 15% of total debt matures within 12 months, eliminating the refinancing risk penalty under both Moody’s and S&P methodologies and reducing leverage ratios by 0.3x-0.5x.

5. Classify all asset sales as “core” disposals in communications with Moody’s, providing detailed operational and strategic justification to minimise the 50% haircut on debt reduction credit, and apply the full proceeds to debt repayment within 12 months to satisfy S&P’s requirements.