Credit Suisse AT1 Bonds: How CHF 16 Billion Went to Zero
Swiss authorities wrote CHF 16bn of AT1 bonds to zero while shareholders were paid. Here is the clause that allowed it — and how to check if your ETF holds them.
Credit Suisse AT1 Bonds Explained: How $17 Billion Was Wiped to Zero
Prefer to watch? This article is the written companion to the video above.
March 2023. A Sunday evening in Bern.
The Swiss Federal Council signs an emergency ordinance. By the time markets open on Monday, CHF 16 billion of Credit Suisse bonds are worth nothing at all. The bondholders lose everything.
The shareholders — who in any ordinary resolution stand at the very back of the queue and absorb losses first — receive roughly CHF 3 billion in UBS stock.
That is not a market failure. Markets did not decide this. It is a rule change, executed over a weekend, and the clause that made it legally possible is sitting inside instruments that may well be in a bond ETF you own right now.
The queue, and who is supposed to stand where
When a bank fails, there is a line. Think of it as the exit queue from a burning building.
Depositors and secured creditors get out first. Behind them, senior unsecured bondholders. Behind them, subordinated debt — which includes AT1 bonds. And at the very back, last out of the building, shareholders.
Shareholders stand last because they signed up for it. They own the upside; they absorb the first losses. That is the deal, and the entire architecture of bank capital rests on it.
What Switzerland did that Sunday was pull the people at the front of the queue out entirely — and let the people at the back walk away with something.
What AT1 bonds actually are
Additional Tier 1 bonds were invented after the 2008 crisis, under Basel III, with a single purpose: absorb losses at a failing bank before public money is used.
They are perpetual. They rank one step above shareholders. And because they carry a genuine risk of being written down, they pay a high yield — in recent years frequently in the high single digits.
This is important and widely misunderstood: an AT1 bond going to zero is not a scandal in itself. It is the product working as designed. These instruments exist precisely to break. Buying one and being shocked when it breaks is like buying fire insurance and being shocked when the insurer pays out for a fire.
The scandal is not that they broke. It is the order in which they broke.
Two triggers — and only one of them fired
Every AT1 prospectus contains a viability event trigger. It fires in one of two ways.
The mechanical trigger. If the bank’s core capital ratio (CET1) falls below a defined threshold — often 7% — the bonds convert or are written down automatically. No judgement, no discretion. A number crosses a line and the instrument does what it says on the tin.
The regulatory trigger. The regulator declares the bank non-viable. This is not automatic. It is a judgement call.
Now hold those two against the facts.
| Credit Suisse CET1 ratio, March 2023 | 14.1% |
| Mechanical trigger threshold | ~7% |
| Did the mechanical trigger fire? | No. Not close. |
| Regulatory capital requirement | Comfortably met |
Credit Suisse held roughly double the capital it was required to hold. The mechanical trigger never came within reach of firing.
So FINMA used the second door. It declared the bank non-viable — and to do so, it did not rely on existing banking law. It relied on Article 5a of an emergency ordinance the Federal Council had signed hours earlier, the same Sunday evening.
A legal basis created in real time, for a write-down executed the same night.
This was a liquidity crisis, not a capital crisis
The distinction matters more than almost anything else here, and it is the one the court would later fasten onto.
Credit Suisse did not run out of capital. It ran out of confidence — and therefore of funding.
The chain is short and brutal:
- March 2021 — Archegos. A single client defaults on margin calls. Credit Suisse loses around USD 5.5 billion in a week. The buffer that would have absorbed what came next is gone.
- Q4 2022. In one quarter, roughly CHF 110 billion of client assets walk out the door.
- 15 March 2023. The bank’s largest shareholder, the Saudi National Bank, is asked publicly whether it will inject more capital. The answer: “Absolutely not.” CDS spreads blow past 1,000 basis points.
- The Swiss National Bank extends roughly CHF 50 billion in emergency liquidity. It buys days. It does not buy confidence.
- 19 March 2023. Over a single weekend, UBS acquires Credit Suisse for around CHF 3 billion. Shareholders receive UBS stock worth roughly CHF 0.76 per Credit Suisse share.
A bank can be perfectly solvent on paper and still die, because banking runs on the assumption that not everyone asks for their money at once. When that assumption breaks, capital ratios are cold comfort.
But note what this means: the thing that killed Credit Suisse was not the thing the AT1 trigger was designed to detect.
What the Swiss court eventually said
For two and a half years this sat as a grievance without a verdict. Then, on 1 October 2025, Switzerland’s Federal Administrative Court ruled — and it did not split the difference.
The court found:
- The write-down lacked a sufficient legal basis. FINMA’s order was revoked.
- Credit Suisse met its capital requirements at the time. The court cited an internal Credit Suisse email from 19 March 2023 stating that the measures being taken were for confidence and liquidity, not capital.
- Article 5a of the emergency ordinance was constitutionally invalid. The Federal Council had delegated emergency powers to FINMA without the authority to do so.
Around 3,000 claimants, across roughly 360 proceedings, had brought the challenge.
And yet nothing has been paid
Here is where it stands as of July 2026 — the part most coverage gets wrong by implying the case is over.
FINMA appealed. UBS appealed. The Swiss Federal Supreme Court granted the appeals suspensive effect, which means the lower court’s ruling has, for now, no legal force.
The bonds remain at zero. Not one franc has been returned to anyone.
Separately, in January 2026, Switzerland began facing investor-state (ISDS) claims under international investment treaties from foreign bondholders — a second front that could ultimately land the bill with the Swiss state rather than with UBS.
This case is not closed.
Was this a Swiss aberration or a global precedent?
This is the question that should determine whether you change anything in your portfolio, so it deserves a straight answer.
Look at the comparison case. When Spain’s Banco Popular failed in 2017, AT1 bonds and equity were written off together. The hierarchy held. Bondholders lost everything — but so did shareholders. Nobody at the back of the queue got out ahead of the people in front.
Look at how fast everyone else distanced themselves. Within 48 hours, the ECB, the Single Resolution Board and the Bank of England all confirmed that in their jurisdictions, common equity absorbs losses before AT1. Singapore and Hong Kong followed. That speed was not a courtesy — it was damage control on a European AT1 market worth hundreds of billions. It worked; the market reopened within months.
So: one jurisdiction, one exception, produced under emergency law.
But do not take too much comfort from that. The lesson is not “AT1 bonds are safe outside Switzerland.” It is narrower and more uncomfortable:
A government can rewrite the loss hierarchy faster than a market can reprice it. The contract you rely on is only as durable as the state’s willingness to be bound by it on a bad weekend.
That is not a reason to panic. It is a reason to know what you own.
What this means for your portfolio
Check
Open the factsheet — better, the full holdings list — of every bond ETF and bond fund you own. Search for three terms:
AT1CoCocontingent convertible
Then read the mandate. If the fund does not explicitly say senior debt only, subordinated financial debt may be permitted.
The obvious place to find AT1 exposure is a specialist product — an AT1 capital bond ETF does what it says. The non-obvious places are worth five minutes of your evening: broad subordinated financials funds, some European financials credit funds, and certain high-yield strategies, where AT1 sits quietly inside the sleeve because it offers exactly the yield the mandate is reaching for.
Then decide, honestly
If you hold AT1 exposure and can explain the write-down mechanics to another person without looking anything up — fine. You are being paid a high single-digit yield for a specific, understood tail risk. That is a legitimate position for someone who has consciously chosen it.
If you cannot explain it, you are not being paid for risk. You are being paid for not having read the prospectus, and that is a fundamentally different trade.
Watching for stress, honestly
You cannot stop a government from rewriting the rules. You can sometimes see the pressure building before the decree gets signed.
- High-yield credit spreads (the ICE BofA option-adjusted spread, free on FRED). Sustained moves above roughly 300 basis points have historically signalled elevated stress; above 500, you are typically in crisis conditions. Credit Suisse’s own CDS spread had blown past 450bp weeks before the write-down. The signal was there.
- The VIX term structure. When spot VIX rises above the three-month future, the curve inverts — a pattern that has tended to appear ahead of major sell-offs, including 2008, 2020 and March 2023.
Neither is a crystal ball, and anyone who tells you otherwise is selling something. They are context, not commands. But they are free, and free context beats none.
The uncomfortable conclusion
Credit Suisse existed for 167 years. It was dismantled over a single weekend.
CHF 16 billion of bonds written to zero by emergency ordinance, while shareholders walked away with roughly CHF 3 billion. A court that called it unlawful. A government that called it necessary. Three thousand claimants and, three years on, not a single franc returned.
The queue exists. The hierarchy is real. It is written into prospectuses and into law, and in the overwhelming majority of cases it holds.
But when the building is genuinely on fire, it is governments — not contracts — that decide who gets out first.
You cannot legislate against that. What you can do is know, precisely, where in the queue each thing you own is standing. That takes about five minutes and a fund factsheet, and it is the most useful thing this entire story has to offer you.
Primary sources
- 01Unlawful write-off of AT1 capital instruments (judgment of 1 October 2025) — Swiss Federal Administrative Court (BVGer)
- 02FINMA to appeal partial decision of the Federal Administrative Court concerning AT1 — FINMA
- 03Swiss Court Strikes Down AT1 Bond Write-Off: A Landmark Decision for Bondholders — DLA Piper
- 04Credit Suisse AT1 bonds: what the Swiss court decision means for investors — Withers
- 05Switzerland faces ISDS claims over Credit Suisse AT1 bond write-off — IISD Investment Treaty News
Questions people actually ask
Why were Credit Suisse AT1 bonds written down to zero?
FINMA, the Swiss regulator, ordered the write-down on 19 March 2023 by declaring Credit Suisse non-viable — a 'viability event' under the bonds' own prospectus. Critically, this was not because the bank breached its capital requirements: its CET1 ratio was 14.1%, roughly double what was required, so the mechanical 7% trigger never fired. The regulator relied instead on Article 5a of an emergency ordinance the Swiss Federal Council had signed hours earlier. On 1 October 2025, the Federal Administrative Court ruled that this order lacked a sufficient legal basis.
Why did Credit Suisse shareholders get paid when bondholders got nothing?
That is the part that broke the convention. In a normal resolution, shareholders absorb losses first and AT1 bondholders — who rank above them — only afterwards. At Credit Suisse the order was inverted: CHF 16bn of AT1 bonds went to zero while shareholders received about CHF 3bn in UBS stock, worth roughly CHF 0.76 per share. When Spain's Banco Popular failed in 2017, AT1 and equity were wiped out together and the hierarchy held. Credit Suisse was the exception, not the rule.
Could the same thing happen to AT1 bonds in the EU or the UK?
Under current law it is considerably less likely, and regulators moved fast to say so. Within 48 hours of the write-down, the European Central Bank, the Single Resolution Board and the Bank of England each confirmed that in their jurisdictions common equity absorbs losses before AT1 instruments. Singapore and Hong Kong followed. The Credit Suisse outcome was produced by Swiss emergency law applied to Swiss-law bonds — one jurisdiction, one exception. But it demonstrated that an emergency statute can be written faster than a market can reprice.
How do I check whether my bond ETF holds AT1 bonds?
Open the fund's factsheet or full holdings list and search for three terms: 'AT1', 'CoCo', and 'contingent convertible'. Then read the mandate — if it does not explicitly say senior debt only, subordinated financial debt may be permitted. The obvious place to find exposure is a specialist AT1 capital bond ETF. The non-obvious places matter more: broad subordinated financials funds, European financials credit funds, and certain high-yield strategies, where AT1 sits quietly inside the sleeve because it offers exactly the yield the mandate is reaching for.
Have the Credit Suisse AT1 bondholders been compensated?
No. As of July 2026, not a single franc has been returned. The Federal Administrative Court ruled the write-down unlawful on 1 October 2025, but FINMA and UBS both appealed to the Swiss Federal Supreme Court, which granted the appeal suspensive effect — meaning the lower court's ruling has no legal force for now and the bonds remain at zero. Around 3,000 claimants across roughly 360 proceedings are still waiting. Switzerland is additionally facing investor-state claims brought under international investment treaties.
What is an AT1 bond, in plain terms?
Additional Tier 1 bonds were created after the 2008 crisis under Basel III with one job: absorb losses at a failing bank before taxpayer money is used. They are perpetual, they sit just above shareholders in the capital structure, and in exchange for that risk they pay a high yield — often in the high single digits. They are, by design, the instrument that is supposed to break. That is not a flaw. That is the entire product.
What is a viability event trigger?
The clause in an AT1 prospectus that determines when the bond can be written down or converted to equity. It fires in one of two ways. The mechanical trigger is automatic: if the bank's CET1 capital ratio falls below a defined threshold — often 7% — the instrument converts or is written down, no judgement involved. The regulatory trigger is discretionary: the regulator simply declares the bank non-viable. Credit Suisse's mechanical trigger never came close to firing. The regulatory one did all the work.
What is the difference between an AT1 bond and a CoCo bond?
In practice the terms are used almost interchangeably. CoCo — contingent convertible — is the broader category: a bond that converts to equity or is written down if a defined trigger is hit. AT1 is the specific regulatory classification under Basel III for instruments that count towards a bank's Additional Tier 1 capital. Essentially all AT1 instruments are CoCos; not every CoCo qualifies as AT1. If either word appears in a fund's holdings, the same write-down mechanics apply.
Are AT1 bonds a bad investment?
They are a high-risk instrument that pays a high yield, which is not the same thing as a bad investment — it is a specific trade. The question is whether you are being paid for a risk you understand or a risk you have not read about. If you can explain the write-down mechanics to another person without looking anything up, a high-single-digit yield for a defined tail risk is a legitimate position. If you cannot, you are not being paid for risk; you are being paid for not having read the prospectus. Not advice — speak to a licensed adviser.
Why did Credit Suisse actually collapse?
Not because it ran out of capital, but because it ran out of confidence and therefore funding. The Archegos default in March 2021 cost around USD 5.5bn and destroyed the buffer. In the fourth quarter of 2022 alone, roughly CHF 110bn of client assets left the bank. On 15 March 2023 the Saudi National Bank publicly refused to inject more capital, CDS spreads blew past 1,000 basis points, and the Swiss National Bank's CHF 50bn liquidity line bought days rather than confidence. A bank can be entirely solvent on paper and still die, because banking rests on the assumption that not everyone asks for their money at once.