Swiss deposit insurance protects CHF 100,000 per depositor per bank. That is the straightforward part. The more useful question — one that FlowBank’s bankruptcy in June 2024 answered clearly for the first time in years — is what that protection actually means when a Swiss bank collapses, which clients come out whole, and why.
FlowBank was a Geneva-based online brokerage and trading bank with CHF 680 million in total assets and over 22,000 client accounts. FINMA declared it bankrupt on 13 June 2024 after the bank failed to meet capital requirements and could not execute a viable capital increase. It was the first significant Swiss bank failure since the deposit protection system was substantially strengthened in 2023 — which made it an unplanned but highly instructive real-world test.
Some FlowBank clients had their money back within two weeks. Others were still waiting in October 2024 — four months after the collapse. What determined the difference had nothing to do with the size of their deposit insurance coverage. It had everything to do with the legal structure of what they held.
How Swiss Deposit Insurance Actually Works — esisuisse, the Pool, and the Guarantee
esisuisse is not a government agency. It is a self-regulatory organization of all licensed Swiss banks and securities firms, mandated by law to administer deposit protection. Every bank licensed to accept deposits in Switzerland must be a member — there is no opt-out. This private-sector structure gives the Swiss system flexibility and collective accountability that government-administered schemes in other jurisdictions lack.
The coverage limit is CHF 100,000 per customer per bank. But “per customer” contains nuances that matter significantly for how you structure your holdings.
Splitting accounts at one bank does not multiply coverage. If you hold CHF 200,000 across two accounts at the same bank, both accounts together are covered only up to CHF 100,000. The bank tracks your total deposit balance as one customer relationship. The split achieves nothing for insurance purposes.
Joint accounts are treated as a separate customer. This is genuinely useful and often misunderstood. A joint account held by two people is treated as a distinct customer from either individual’s sole accounts at the same bank — giving the joint account its own CHF 100,000 coverage. So a couple with CHF 100,000 each in individual accounts and CHF 100,000 in a joint account has CHF 300,000 covered in total, not CHF 100,000.
Corporate accounts are also separate customers. A holding company’s deposit at a bank has its own CHF 100,000 coverage, separate from the individual owner’s personal deposit at the same bank. For clients using holding structures, this provides a small additional layer — but does not solve the fundamental exposure for larger holdings.
The mechanics behind the scheme: esisuisse maintains a financial pool of approximately CHF 7.9 billion, funded by annual contributions from member banks of roughly 0.09% of covered deposits. When esisuisse is triggered, funds from all other Swiss banks are mobilized collectively to repay depositors. The legal mandate requires access to insured funds within 7 working days of FINMA declaring bankruptcy — in practice, repayments typically occur within 3 to 5 working days.
There is one more mechanism almost no deposit insurance article mentions. Swiss law requires every bank to hold assets in Switzerland equal to at least 125% of its preferential deposits at all times. This liquidity buffer exists specifically so that, when a bank fails, the liquidator can repay privileged deposits from the bank’s own Swiss assets — before esisuisse needs to be called at all. This is why esisuisse was never triggered at FlowBank.
The FlowBank Bankruptcy — What Actually Happened to 22,000 Clients
FlowBank was founded in Geneva in 2020 by CEO Charles-Henri Sabet as an online brokerage and trading platform. It grew quickly, reaching 22,000 client accounts and CHF 680 million in total assets. But FINMA had been watching it closely for years before the collapse.
In October 2021, FINMA took its first enforcement action against FlowBank for serious breaches of supervisory law regarding capital requirements and risk management. By October 2022, FINMA ordered comprehensive remediation measures and appointed an independent auditor to monitor implementation. FlowBank’s management accepted these conditions. But when the 2023 annual financial statements were finalized, it became clear the bank’s situation was materially worse than previously disclosed. Capital requirements had been breached at end-2023, and again by April 2024. An eligible capital increase could not be executed in time.
On 13 June 2024, FINMA declared FlowBank bankrupt and appointed the law firm Walder Wyss AG as liquidator. The bank had approximately CHF 53 million in total privileged deposits across its 22,000 client accounts — an average of roughly CHF 2,400 per client, which reflects the fact that FlowBank was primarily a brokerage platform and most client assets were held in custody, not as cash deposits.
Because the bank’s Swiss liquid assets covered 125% of those privileged deposits, esisuisse was not activated. The liquidator used FlowBank’s own available funds. FINMA’s spokesperson confirmed: “According to current calculations, the privileged deposits can be repaid in full out of the bank’s available funds. Therefore we do not expect the Swiss banks’ deposit insurance scheme (esisuisse) to be involved. Client custody accounts will also be segregated from the estate and repaid.”
The experience differed significantly depending on what clients held and how their accounts were structured.
Clients with individual cash accounts received their up-to-CHF-100,000 back within approximately two weeks, via the FlowBank platform which was briefly reopened with a single function: initiating repayment transfers. Clients with joint accounts had a slower path — they needed to contact the liquidators by email, which introduced delays. By early October 2024 — four months after bankruptcy — 47 million of the 53 million CHF in privileged deposits had been repaid, an 88% completion rate.
For custody account holders — the majority of FlowBank’s clients by asset value — the legal protection was absolute. Securities are segregated from the bankruptcy estate under Swiss law and cannot be seized to repay the bank’s creditors. But “legally protected” and “quickly accessible” proved to be different things. The process of transferring securities to new custodians was, in the words of one Swiss financial publication covering it in October 2024, “tedious and time-consuming.” Some clients were still waiting for their securities months after the collapse.
The clients who came out worst: those with cash deposits above CHF 100,000. Above that threshold, they were unsecured creditors in the bankruptcy estate — third-tier claims — with recovery dependent on what the liquidator could ultimately realize from FlowBank’s remaining assets. That process has no guaranteed timeline and no guaranteed recovery rate.
The Legal Distinction That Determines Whether You Are Protected — Deposits vs Custody Assets
The FlowBank case confirmed a legal principle that most depositors and many financial advisers never consider. Your position in a Swiss bank bankruptcy is not determined by how much deposit insurance you have. It is determined by whether you are a creditor or an owner.
When you deposit cash, you are a creditor. You hand your money to the bank, and the bank legally owns it. In return, you hold a claim against the bank for that amount — a contractual right to get it back. If the bank fails, your claim enters the bankruptcy waterfall: insured deposits (up to CHF 100,000) are paid first, then other privileged claims, then unsecured creditors. Anything above CHF 100,000 in cash deposits sits in a lower priority tier and recovers only what the bankruptcy estate can return.
When you hold securities in custody, you are an owner. When you instruct a bank to purchase stocks, bonds, or ETFs and hold them in a custody account, the bank does not own those securities. You do. The bank is your custodian — holding the assets on your behalf. Under Swiss bankruptcy law and international custody principles, assets held in custody are explicitly excluded from the bankruptcy estate. They cannot be seized to repay the bank’s creditors. They must be returned to you, in full.
This is not a grey area in Swiss law. It is codified. FINMA confirmed it explicitly in the FlowBank statement: custody accounts segregated from the estate and repaid. The question FlowBank raised was not whether custody clients would be protected — they were. The question was how quickly and how smoothly that return would happen. The answer, in practice, was: legally certain but operationally slow.
The Strategy — Converting Cash Deposits to Custody Assets
Understanding the legal distinction is the first step. Using it is the second — and it is more straightforward than most clients expect.
The approach: instruct your bank to convert large cash deposit balances into securities held in custody. Not speculative investments. Not complex products. Ultra-liquid, investment-grade instruments that preserve capital, generate some yield, and sit outside the bankruptcy estate by law.
I want to be precise about the risk trade-off here, because the original framing of this strategy as “bulletproof” is not quite accurate. When you hold government bonds in custody, you eliminate bank failure risk. You replace it with sovereign risk (the chance that the bond-issuing government defaults) and market risk (the chance that the bond’s market price declines before maturity). For CHF-denominated Swiss Confederation bonds or USD-denominated US Treasury bonds, sovereign risk is effectively zero by any practical measure. Market risk exists but is manageable — particularly for short-duration bonds, where price volatility is minimal.
The eligible instruments, in order of typical preference:
| Security | Issuer | Liquidity | Sovereign Risk | Typical Use |
|---|---|---|---|---|
| Swiss Confederation Bonds | Swiss Federal Government | Very high | Virtually zero | CHF-denominated preservation; 1–5 year maturity typical |
| US Treasury Bills / Bonds | US Federal Government | Very high | Effectively zero | USD liquidity; short-term T-bills for near-cash equivalent |
| Supranational Bonds | EIB, World Bank, IMF affiliates | High | Extremely low | EUR or multi-currency diversification; AAA-rated |
| Government Bond ETFs (AAA only) | iShares, Vanguard (Swiss/US govts only) | Very high | Diversified — low | Hands-off approach; automatic diversification |
Implementation has four steps. First: instruct your bank to liquidate cash holdings above your working capital requirement and purchase the chosen securities. Second: ask the bank explicitly, “Are these securities held in custody for my account, segregated from the bank’s balance sheet?” — the answer should be an unambiguous yes, with written confirmation. Third: understand where the securities are registered — either directly in your name at SIX (the Swiss securities clearing infrastructure) or in a segregated custodial account. Fourth: review annually to confirm the custody status has not changed and that no securities have been pledged as collateral without your knowledge.
For a typical HNWI with CHF 5 million in a Swiss bank, a practical structure: CHF 100,000 to CHF 200,000 in current account cash (daily operations, immediately liquid, covered by esisuisse), with the remaining CHF 4.8 to 4.9 million in custodied Swiss Confederation or US Treasury bonds. The cash portion handles liquidity needs. The bond portion sits outside the bankruptcy estate regardless of what happens to the bank. The yield from short-duration government bonds partially offsets the opportunity cost versus higher-yield instruments. The tax treatment of bond income held in Swiss custody varies by residency status — the specifics are covered in our guide to tax considerations for Swiss bank clients.
For Ultra-HNW Clients — Multi-Bank Structures and Additional Layers
For clients with CHF 10 million or more, the custody strategy is the foundation — but additional structural diversification reduces the operational risk that FlowBank custody clients experienced: the months-long wait to have securities transferred to a new custodian.
Multi-bank custody distribution. Splitting custodied bond holdings across two or three institutions means that if one bank fails, only a portion of your portfolio requires a custody transfer. The remainder continues to be accessible at the other banks while the liquidation process for the failed institution runs its course. A practical distribution: CHF 3–4M with a major Swiss private bank, CHF 3–4M with a second established institution, with each holding in custody-segregated government bonds. The legal protection applies at each bank independently. For institution comparisons and suitability by client profile, our guide to the top Swiss banks for foreigners covers the options in detail.
The ETF approach. For clients who prefer not to manage individual bond positions, AAA-rated government bond ETFs achieve the same custody protection with simpler administration. The ETF itself is a custody asset — you own units in a fund that holds government bonds — and the legal segregation applies to the ETF units as it would to individual bonds. iShares Swiss Government Bond ETFs and Vanguard US Government Bond ETFs are liquid enough to be treated as near-cash equivalents in most private banking contexts.
Foreign securities as a hedge. Holding a portion of custodied assets in non-Swiss sovereign bonds — US Treasuries or German Bunds — introduces a layer of jurisdictional diversification. If Swiss bankruptcy law were somehow challenged in an extreme scenario, the claim on non-Swiss sovereign debt would be governed by separate legal frameworks. This is a genuinely remote contingency, but for ultra-HNW clients managing existential risk rather than probability-weighted returns, it is worth including.
How to Verify Your Protection Right Now — Three Practical Steps
The FlowBank case revealed that clients who understood their custody status came into the bankruptcy with a clear picture of their position. Those who did not — and who had assumed their “bank account” protected them — faced uncertainty that lasted months. Three steps to avoid that position.
Step 1: Know your deposit total relative to CHF 100,000. Pull your most recent account statement. Identify every cash balance — current accounts, savings accounts, fixed-term deposits, precious metal accounts — at each Swiss bank. Any amount above CHF 100,000 per bank is exposed as an unsecured creditor if that bank fails. If you are significantly above CHF 100,000 in cash at any single institution, the custody conversion strategy applies directly.
Step 2: Clarify the custody status of all securities. Contact your bank’s relationship manager or custody department and request written confirmation that all securities held in your name are: (a) held in custody for your account, (b) segregated from the bank’s own balance sheet, and (c) not pledged as collateral against any bank facility without your explicit prior consent. This should be a one-page letter. If the bank cannot or will not provide it, that is itself informative.
Step 3: Review annually. Custody status can change — banks restructure their operations, and securities can be reclassified without obvious notification. A brief annual review of your custody confirmation, combined with a check of the bank’s capital ratios against FINMA’s public reporting and our Swiss bank credit ratings and full list, takes less than an hour and keeps your position clear. If you are considering establishing or restructuring a Swiss bank account with deposit protection built in from the start, or are a non-resident opening a Swiss account, structuring custody arrangements correctly at inception is simpler than retrofitting them later. Swiss banking options for nonresidents can provide unique benefits, particularly in terms of privacy and asset protection. Understanding the various types of accounts and their requirements is essential for making informed decisions. Additionally, it’s advisable to consult with a financial advisor who specializes in international banking to navigate any complexities involved.
The Swiss deposit insurance system is well-designed and has performed correctly in every case it has been tested — including, indirectly, FlowBank, where the 125% liquidity rule meant esisuisse did not need to be called at all. But Swiss deposit insurance is designed to protect retail depositors, not to serve as a wealth preservation strategy. For significant holdings, the custody segregation principle is the mechanism that actually does that job. Swiss banking law makes this framework available to every account holder — it simply requires understanding it and acting on it deliberately.
