Additional Tier 1 (AT1) instruments—often called contingent convertibles or “CoCos”—were built to act as a bank’s first line of defense in stress. To function as going-concern capital, they must carry equity-like loss-absorption features, and the most investor-salient of these is that coupons are not guaranteed. Coupon payments on AT1s are discretionary: a bank may cancel them (and, in many frameworks, a supervisor may require cancellation) without triggering a default. That principle is not marketing copy or custom; it is written into the rulebooks.
n the world of bank capital instruments, the so-called Additional Tier 1 (AT1) bonds occupy a special place. These securities are designed to absorb losses in times of financial stress and, by their nature, carry features that set them apart from traditional debt. One of the most important features is the discretionary coupon payment — meaning that interest (or coupon) payments on AT1 bonds may be cancelled, skipped or delayed without the issuer being considered in default.
The reason behind this design is rooted in regulatory objectives. Banks issue AT1 bonds to bolster their capital buffers: if a bank gets into trouble, these instruments serve as a shock absorber. To serve that role, the instruments must give banks and regulators flexibility. If the bank’s capital is under stress, it must have the ability to conserve resources rather than being obligated to make fixed coupon payments as conventional bonds might demand.
In the United States, the Federal Reserve’s Regulation Q (12 CFR Part 217) sets out eligibility criteria for Additional Tier 1 capital. It expressly requires that the issuer have “full discretion at all times to cancel dividends or other distributions” on an AT1 instrument “without triggering an event of default,” and that any distributions be paid only out of income or retained earnings. This is codified in §217.20(c)(1)(vii)–(viii) and appears verbatim in the e-CFR. (Legal Information Institute)
In the European Union, Article 52 of the Capital Requirements Regulation (CRR) anchors the same concept. AT1s must be perpetual, have no obligation to make distributions, and crucially, the cancellation of distributions must not constitute an event of default or impose constraints on the institution. The consolidated CRR text and the U.K.’s on-shored version both preserve this logic; in fact, the retained U.K. CRR text and PRA materials reproduce that cancellation-without-default rule almost word for word. (Legislation.gov.uk)
Switzerland’s post-Credit Suisse debates put a spotlight on write-down mechanics, but the discretionary coupon principle itself is not unique to Europe and the U.S.; it runs through Asia’s Basel-aligned regimes as well. In India, the Reserve Bank of India’s Basel III framework has long embedded “coupon discretion” for AT1s, and supervisory and market documents in India repeatedly emphasize that banks must be able to cancel coupons and that such coupons are non-cumulative. RBI’s master circulars and explanatory materials, along with Indian AT1 term sheets, set this out unambiguously. (rbi.org.in)
Singapore’s MAS Notice 637, which implements Basel capital standards for locally incorporated banks, likewise specifies the eligibility conditions for AT1 instruments—among them, that distributions are fully discretionary and cancellable. MAS has updated Notice 637 repeatedly, and 2024–25 materials continue to govern risk-based capital and minimum requirements for AT1 and Tier 2; the expectation of discretionary, non-cumulative coupons remains a core eligibility test. (mas.gov.sg)
Hong Kong embeds AT1 criteria directly in statute through the Banking (Capital) Rules (Cap. 155L). Schedule 4B sets the conditions under which an instrument qualifies as Additional Tier 1 capital of an authorized institution; within this regime, “distribution payment requirements” and the treatment of discretionary payments are addressed in the Rules and subsequent amendments, and supervisory policy manuals cross-reference the Basel logic on fully discretionary distributions. (elegislation.gov.hk)
Thus, investors in AT1 bonds — globally — need to understand that the coupon is not guaranteed. In the case of distress, regulatory or contractual terms typically permit the issuer to suspend interest payments. This underscores a key risk: although AT1 bonds often yield more than senior debt (compensating investors for higher risk), investors may find themselves without payment or even facing principal write-down in extreme circumstances.
For banks and regulators , the existence of capital adequacy rules — and the discretionary design of AT1 bonds — converges ensuring that banks hold adequate capital and can operate in an orderly manner even when under stress.
In sum, the discretionary coupon feature is a fundamental design element of AT1 instruments. Distributions are paid only when capital and earnings permit, and their cancellation—even pre-emptively for conservation—does not amount to a default. Investors accept that asymmetry in exchange for higher yields and ranking ahead of equity, while supervisors get flexibility to conserve capital in stress, exactly as Basel intended.
AT1 Coupon-Payment Rules across Jurisdictions
| Jurisdiction | Source Rule/Instrument | What the Rule Says About AT1 Coupons | Practical Takeaway |
|---|---|---|---|
| United States | Federal Reserve, Regulation Q (12 CFR §217.20) | AT1 eligibility requires that the issuer have full discretion at all times to cancel dividends or other distributions without triggering default; distributions must be paid from income or retained earnings. (Legal Information Institute) | Coupons are non-cumulative and cancellable at the bank’s discretion; skipping a coupon is not a default event. |
| United Kingdom | U.K. CRR (retained EU law) and PRA materials | The on-shored CRR preserves Article 52 conditions: no obligation to pay; cancellation is not an event of default and imposes no restriction on the bank. PRA documents reproduce the same standard. (Bank of England) | Same as EU: coupons are fully discretionary; cancellation carries no default consequence. |
| European Union | CRR Article 52 (Regulation (EU) No 575/2013, consolidated) | AT1 must be perpetual; distributions are not obligatory; cancellation is not an event of default and may impose no constraints on the institution. (Legislation.gov.uk) | Banks may cancel coupons to conserve capital; investors have no default claim on cancellation. |
| India | RBI Basel III capital framework and market term sheets | RBI’s Basel III regime embeds coupon discretion and non-cumulative features; Indian AT1 term sheets explicitly state “cancellation of discretionary payments” and coupon discretion. (rbi.org.in) | Coupons can be skipped without default, subject to distributable items and regulatory capital triggers. |
| Singapore | MAS Notice 637 (risk-based capital for banks) | Notice 637 sets AT1 eligibility and capital requirements; in line with Basel, distributions on AT1 are fully discretionary and cancellable; recent notices and consultations maintain this framework. (mas.gov.sg) | Coupons are non-cumulative and cancellable; MAS may expect cancellation to preserve capital in stress. |
| Hong Kong | Banking (Capital) Rules (Cap. 155L), Schedule 4B; amendments on distribution requirements | Statutory eligibility for AT1 is set in Schedule 4B; distribution-payment and conservation provisions are addressed in the Rules and amendments, aligning with Basel’s discretionary distribution concept. (elegislation.gov.hk) | Coupons are discretionary within the statutory framework; cancellation supports capital conservation. |
References
European Banking Authority. “Article 52—Additional Tier 1 Instruments,” Capital Requirements Regulation (CRR), consolidated references and links. Accessed October 2025. https://www.eba.europa.eu/regulation-and-policy/single-rulebook/interactive-single-rulebook/16106. (European Banking Authority)
European Union. Regulation (EU) No. 575/2013 (CRR), Article 52 (consolidated texts, 2024–2025 updates). Accessed October 2025. https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:02013R0575-20240709. See also U.K. retained text at legislation.gov.uk. (EUR-Lex)
Federal Reserve Board. “12 CFR §217.20—Capital components and eligibility criteria for regulatory capital instruments (Regulation Q).” Electronic Code of Federal Regulations. Accessed October 2025. https://www.law.cornell.edu/cfr/text/12/217.20. (Legal Information Institute)
Hong Kong e-Legislation. Banking (Capital) Rules, Cap. 155L, Schedule 4B, “Additional Tier 1 capital: criteria.” Accessed October 2025. https://www.elegislation.gov.hk/hk/cap155L/sch4B. See also Banking (Capital) (Amendment) Rules 2023. https://www.legco.gov.hk/yr2023/english/subleg/negative/2023ln167-e.pdf. (elegislation.gov.hk)
Monetary Authority of Singapore. MAS Notice 637 (Risk-Based Capital Adequacy Requirements for Banks) and amendments; consultation on AT1/T2 requirements, March 27, 2025. Accessed October 2025. https://www.mas.gov.sg/…/notice-637 and https://www.mas.gov.sg/…/consultation-on-the-prudential-treatment-of-cryptoassets-and-reqs-for-at1-and-t2-capital-instruments.pdf. (mas.gov.sg)
Reserve Bank of India. Master Circular—Basel III Capital Regulations (select provisions on AT1 coupon discretion); see also representative Indian AT1 term sheets (e.g., SBI Basel III AT1, 2023) confirming coupon cancellation mechanics. Accessed October 2025. https://www.rbi.org.in/commonman/Upload/English/Notification/PDFs/70BIIIMC010713.pdf; https://www.thefixedincome.com/uploads/products/term_sheet_upload/1689677593ts.pdf. (rbi.org.in)
Basel Committee on Banking Supervision. Basel III—Definition of Capital: Frequently Asked Questions (cancellation “stoppers” must not impede full discretion over AT1 distributions). March 2017. https://www.bis.org/bcbs/publ/d417.pdf. (Bank for International Settlements)
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