Credit Rating and Perpetual Bonds (AT1 and Similar Instruments)

Perpetual bonds, including the Additional Tier 1, or AT1, instruments issued by banks, carry loss-absorption features that make them meaningfully riskier than standard senior debt from the same issuer, and rating agencies typically reflect this through a distinctly lower rating on the perpetual instrument compared to the issuer's senior debt rating.

What Makes a Perpetual Bond Different From a Standard Bond

A perpetual bond has no fixed maturity date, distinguishing it from the standard fixed-tenure bonds and NCDs discussed elsewhere in this pillar; instead, it typically carries a call option allowing the issuer, at its discretion, to redeem the instrument after an initial period, though redemption is not guaranteed and investors should not assume a call will necessarily be exercised at the first available opportunity. Additional Tier 1, or AT1, bonds are a specific category of perpetual instrument issued by banks as part of their regulatory capital structure under the Basel III capital adequacy framework as adapted by RBI for Indian banks, and they carry specific loss-absorption features not present in standard senior debt.

The Loss-Absorption Features That Distinguish AT1 Bonds

AT1 bonds typically include contractual provisions allowing the issuing bank, or requiring it under specified trigger conditions tied to the bank's regulatory capital ratios, to either write down the instrument's principal value or convert it into equity, effectively absorbing losses ahead of, and to protect, more senior creditors and depositors if the bank's capital position deteriorates sufficiently. Coupon payments on AT1 bonds are also typically discretionary in a way that distinguishes them from standard bond coupons, meaning the issuing bank can, under specified circumstances, skip a coupon payment without this constituting a default in the way a missed coupon on standard senior debt would.

Why Rating Agencies Assign AT1 Bonds a Lower Rating Than the Issuer's Senior Debt

Given these loss-absorption and discretionary-coupon features, rating agencies generally assign AT1 and similar perpetual bonds a meaningfully lower rating than the same issuer's senior, standard debt instruments, even though both are issued by the identical bank — reflecting the genuinely higher risk to AT1 investors specifically arising from the instrument's structural features, quite apart from the issuing bank's overall creditworthiness. This differential is a deliberate, methodology-driven feature of how rating agencies approach these instruments, not an inconsistency, and investors should understand that an issuer's strong overall rating does not translate directly into an equally strong rating for that same issuer's AT1 instruments specifically.

Heightened Regulatory Scrutiny Following Past Market Events

The Indian AT1 bond market experienced a significant, closely watched episode when a major private bank's AT1 bonds were written down to zero as part of a regulatory reconstruction scheme, an event that prompted considerable market and regulatory attention to how these instruments had previously been sold to, and understood by, a broad base of investors including retail investors. Following this and related developments, SEBI introduced specific measures affecting how AT1 and similar perpetual bonds may be marketed and held by mutual funds, including restrictions on mutual fund exposure to such instruments and valuation-related requirements, reflecting a broader regulatory effort to ensure the specific risks of these instruments are more clearly understood and appropriately priced by the investor base. Companies and investors dealing with AT1 or similar perpetual instruments should confirm the currently applicable specific regulatory framework, given this area has seen meaningful regulatory evolution.

Illustrative Example

Consider a hypothetical mid-sized private bank with a strong AA rating on its senior debt instruments planning to issue AT1 bonds as part of its regulatory capital planning. The AT1 instrument itself is assigned a rating several notches below the bank's senior debt rating by the rating agency, explicitly reflecting the discretionary coupon and loss-absorption features specific to this instrument category, even though the underlying bank's overall financial strength is unchanged from what supports its senior debt rating. The bank's investor relations team proactively ensures this rating differential, and the specific structural features driving it, are clearly explained in the instrument's offer documentation and investor communications, reflecting the heightened market and regulatory sensitivity around ensuring AT1 investors genuinely understand what they are holding, following the broader market developments and regulatory changes in this specific instrument category in recent years.

Frequently Asked Questions

Why would an investor buy an AT1 bond given its additional risks?

AT1 bonds typically offer a meaningfully higher coupon than the same issuer's senior debt, compensating investors for the additional loss-absorption and discretionary-coupon risk, and some institutional investors with an appropriate risk mandate specifically seek this higher-yield instrument category.

Can retail investors still buy AT1 bonds in India?

Regulatory measures introduced following past market developments have specifically addressed how these instruments may be marketed and held, including mutual fund exposure restrictions, so the current position on retail accessibility should be confirmed against the currently applicable SEBI and RBI framework rather than assumed.

Does a bank's AT1 bond rating change when its senior debt rating changes?

The two ratings, while related since they reflect the same underlying issuer, are assessed somewhat independently given the AT1 instrument's distinct structural features, so a change in one does not automatically or mechanically produce an identical change in the other, though they often move in the same general direction.

Are AT1-style instruments used only by banks, or by other companies too?

AT1 instruments in the specific regulatory capital sense described here are primarily associated with banks under the Basel III framework, though other perpetual bond structures without the same specific bank regulatory capital features exist and are used by a broader range of issuers, each requiring its own careful assessment of the specific structural terms involved.

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Disclaimer: This article is intended for general informational and educational purposes only and does not constitute financial, credit, investment, or legal advice. Credit ratings are assigned solely by SEBI-registered Credit Rating Agencies (such as CRISIL, ICRA, CARE Ratings, India Ratings, Brickwork, Acuite, and Infomerics) based on their own methodologies, policies, and the information available to them at the time of assessment. FinMen Advisors provides preparatory and advisory support to companies undergoing a rating exercise and does not issue, influence, or guarantee any rating outcome. Readers should exercise independent judgement and consult qualified professionals before making business or financial decisions.