AT1 bonds

Indian Economy glossary

Also called: Additional Tier 1 bonds, CoCo bonds · Topic: Financial Markets, Instruments, Insurance and Pensions · NCERT: Beyond NCERT

Meaning

AT1 (Additional Tier 1) bonds are perpetual, unsecured bonds issued by banks to raise capital. Their coupons (interest payments) are discretionary, which means the bank can skip them. If the bank's capital falls below a set trigger, the bonds can be written down (cut to zero) or converted into equity.

They matter because they sit between a bank's depositors and its shareholders. When a bank gets into trouble, AT1 holders can be made to take losses, so taxpayers and depositors take less of the hit. They are also called CoCo bonds (contingent convertible bonds), because they turn into shares or get written off only if a stated trigger event happens.

Formula (perpetual bond): Price = Annual coupon ÷ Market interest rate

Explanation

How an AT1 bond works

Perpetual: it has no maturity date. The bank never has to repay the principal (the original amount lent).
The bank may repay early by using a call option (the issuer's right to buy the bond back).
Unsecured: no asset is pledged behind it. If the bank fails, AT1 holders have no specific asset they can claim.
Discretionary coupon: the bank can skip interest payments, and skipping one does not count as a default.
Loss absorption: if the bank's capital falls below the trigger, one of two things happens:
Write-down: the bond's value is cut, up to fully to zero.
Conversion: the bond is turned into the bank's shares (equity).
Higher coupon: investors carry all these risks, so AT1 bonds pay higher interest than ordinary bonds.

Why banks issue them: capital, not just borrowing

Bank capital is the bank's own money that can absorb losses before depositors lose anything.
Under Basel III (the global rules on how much capital banks must hold), Tier 1 capital is the bank's core, loss-absorbing capital. It has two parts:
Common equity: shares and retained profits. These take losses first.
Additional Tier 1: instruments such as AT1 bonds. These can take losses while the bank is still running.
Why this helps the bank:
An AT1 bond counts as capital, much like shares.
But issuing it does not reduce the stake of existing shareholders, unless the bond is converted into shares.
So banks can meet capital rules without selling new shares at a low price.
How AT1 bonds count as bank capital under Basel III is covered in banking-regulation-npas.

The usual order of losses, and how it can break

Normal order when a bank fails:
Shareholders lose first.
Then AT1 holders.
Depositors and senior creditors are protected the longest.
The Credit Suisse case (2023) broke this order:
AT1 holders were wiped out.
Shareholders still got something.
Since then, investors see AT1 as riskier than its place in the order suggests.

Worked example: why a "no maturity" bond is so sensitive to interest rates

Take a perpetual bond that pays ₹100 a year for ever.
Market interest rate 5%: Price = ₹100 ÷ 0.05 = ₹2,000.
Market interest rate 10%: Price = ₹100 ÷ 0.10 = ₹1,000.
What this shows:
No principal ever comes back to cushion the price, so the whole value rests on future coupons.
When market rates rise, the price falls a lot.
An AT1 coupon can also be skipped, or the bond written off, so the real risk is even higher.
What makes AT1 bonds fall in value:
Market interest rates rise.
The bank's capital gets close to the trigger.
Fear grows that the regulator will write the bonds down, as happened with Yes Bank and Credit Suisse.

In India

Issuers: Indian banks, both public sector and private, issue AT1 bonds to meet Basel III capital rules. These rules are enforced by the RBI (the bank regulator).
Yes Bank (2020): when Yes Bank was rescued, ₹8,415 crore of its AT1 bonds were fully written off.
Many small investors had been sold these bonds as if they were safe, fixed-deposit-like products. This showed a mis-selling problem.
SEBI rule for mutual funds (2021): mutual funds must value AT1 bonds as if they mature in 100 years.
A longer assumed maturity gives a lower value, which shows the real risk.
This stops funds from making these bonds look safer than they are.
Link to the bond market: India's corporate bond market is only about 16% of GDP (2025) [1], and most issues come from AAA-rated PSUs and financial firms such as banks. So bank bonds like AT1 make up a noticeable part of what investors can buy.

Don't confuse with

Convertible bond: here the holder chooses to convert into shares when it pays off. An AT1 bond is converted or written down by force when the bank's capital falls below the trigger, which hurts the holder.
Ordinary perpetual bond: also has no maturity, but its coupon is not normally skippable and it has no write-down feature. AT1 is a special, riskier perpetual bond issued only by banks.
Equity shares: shareholders normally take losses before AT1 holders. AT1 is debt that behaves like equity only under stress. (The Credit Suisse 2023 case reversed this order.)
NCD (non-convertible debenture): it can never become shares and has a fixed maturity. AT1 has no maturity and can be converted or written off.

Prelims Hooks

AT1 bonds are perpetual (no maturity) and unsecured, with discretionary coupons. Skipping a coupon is not a default.
When the capital trigger is hit, AT1 bonds are written down or converted into equity. That is why they are also called CoCo (contingent convertible) bonds.
Yes Bank (2020): ₹8,415 crore of AT1 bonds were fully written off.
SEBI (2021): mutual funds must value AT1 bonds as if they mature in 100 years.
Credit Suisse (2023): AT1 holders were wiped out while shareholders still got something. This reversed the usual loss order.
Trap: AT1 counts as Tier 1 capital under Basel III, not Tier 2. And the issuer's call option lets the bank, not the investor, repay early.

Mains Points

Bank stability vs investor protection: AT1 bonds let banks raise loss-absorbing capital without selling cheap new shares, so the cost of a rescue shifts from taxpayers to investors. But the Yes Bank write-off (₹8,415 crore, 2020) shows the risk of selling complex products to small investors. That calls for stronger suitability and disclosure rules. SEBI's 100-year valuation rule (2021) is one example.
Trust in the loss order: capital markets depend on a clear, predictable order of who loses first. Cases like Credit Suisse (2023), where AT1 holders lost more than shareholders, raise the risk premium on AT1 bonds. That makes it costlier for banks, including Indian public sector banks, to raise capital.
Link to a shallow bond market: India's corporate bond market is only about 16% of GDP (2025) [1]. So banks carry most of the economy's credit risk and need strong capital. Well-priced, clearly regulated AT1 bonds help banks keep lending without constant money from the government.

Related concepts

Corporate, offshore and thematic bonds

Sources

1NITI Aayog releases Report on "Deepening the Corporate Bond Market in India"pib.gov.in · tier 1