A Swiss custodian bank holds financial assets, processes transactions and maintains the official account records, while an independent wealth manager manages the portfolio under a separate written mandate. For U.S. clients, opening and operating this type of account involves eligibility review, Know Your Customer and anti-money-laundering checks, funding, ongoing portfolio management and continued U.S. tax and account-reporting obligations.

The word custodian can sound more complicated than the role itself. In this context, a custodian bank is the institution that holds the account and financial assets, records cash and securities, processes transactions and provides the official statements. Cross-border wealth management means managing assets across more than one country, currency, custodian or legal jurisdiction while complying with the applicable rules. The custodian bank is the operational foundation of that relationship; the wealth manager is responsible for portfolio management within the authority granted by the client.

For a U.S. person, the process is more detailed than simply choosing a bank and transferring money. Swiss institutions decide individually whether they will accept U.S. clients, and they apply both Swiss due-diligence requirements and U.S.-related tax-transparency procedures. The following steps explain how the relationship generally works from the first eligibility review through ongoing account administration.

1. Eligibility and Custodian Selection Come First

Not every Swiss bank offers investment accounts to U.S. persons. Before formal paperwork begins, the wealth manager normally identifies which custodian banks may be suitable based on the client’s residence, citizenship, account type, intended asset level, desired currencies, ownership structure and investment needs. Minimum account sizes, service models, fees and accepted client profiles vary by institution.

WHVP’s step-by-step guide to opening a Swiss investment account explains that access depends on each institution’s onboarding criteria, documentation requirements and willingness to serve U.S. clients.The wealth manager can help identify appropriate options and prepare the application, but the custodian bank makes the final account-acceptance decision. WHVP guides clients through each stage of the process, helps organize the required documentation, coordinates follow-up questions with the bank and explains what to expect next. The custodian bank still conducts its own review and makes the final account-opening decision.

2. The Bank Completes KYC and Anti-Money-Laundering Checks

Know Your Customer, commonly shortened to KYC, is the process of verifying who the client is, who ultimately owns or controls the assets and whether the proposed relationship is consistent with the information provided. Anti-money-laundering checks examine the background, purpose and expected activity of the account. These reviews are not optional formalities; they are part of the institution’s legal obligations.

FINMA states that Swiss financial intermediaries must verify the identity of the contracting party, identify the beneficial owner of the assets and clarify the financial background and purpose of unusual or higher-risk relationships. More detail is available in FINMA’s overview of anti-money-laundering supervision.

A typical individual application may require:

• A valid passport or other accepted identification document
• Proof of residential address
• A U.S. taxpayer identification number and tax-status forms requested by the bank
• Information about employment, business interests and the purpose of the account
• Evidence of the source of wealth and the source of the assets being transferred
• Financial statements or account statements supporting the information provided
• Additional documents for companies, trusts, foundations or other legal structures

Source of wealth describes how the client accumulated their overall wealth, such as business ownership, employment income, investments, inheritance or the sale of an asset. Source of funds refers more narrowly to where the specific money or securities entering the new account are coming from. A bank may request supporting records for both, particularly when the ownership structure or transaction history is complex.

3. The Client Reviews and Signs the Account Documents

Once the preliminary review is complete, the custodian bank issues its account-opening documents. These documents establish the account holder, authorized persons, communication preferences, tax status and the services the bank will provide. The client may also sign a separate portfolio-management agreement with the independent wealth manager.

The management agreement should define the investment mandate, risk parameters, fee arrangements and the authority granted to the wealth manager. In a discretionary mandate, the wealth manager can make portfolio decisions within the agreed limits without obtaining separate approval for every transaction. The authority does not transfer ownership of the assets to the wealth manager and does not ordinarily permit the wealth manager to withdraw assets for its own benefit.

Depending on the bank and the client’s location, identification and signing may take place in person, by correspondence or through an approved video or online process. The exact procedure is determined by the custodian bank.

4. The Custodian Bank Approves the Relationship Before Funding

Submitting documents does not mean that the account is automatically open. The bank’s compliance team reviews the full file and may ask follow-up questions, request updated evidence or seek clarification about a transaction, business activity or ownership structure. The account should only be funded after the bank confirms that it has approved and opened the relationship.

The review time varies. A straightforward individual account with complete documentation may move faster than an account involving several entities, multiple beneficial owners, politically exposed persons, recent large transactions or assets originating from several institutions. Providing complete, consistent information at the beginning is usually the best way to avoid unnecessary delays.

5. Assets Are Transferred to the Client’s Custody Account

After approval, the client transfers cash or eligible securities from an account whose ownership can be verified. The custodian bank books the incoming assets to the client’s account and records the applicable currencies, securities and acquisition information available from the transferring institution.

Before transferring securities, the client and wealth manager should confirm that the new custodian can accept and service them. Certain U.S. funds, privately held investments, restricted securities or other specialized assets may not be transferable. Where an asset cannot be accepted, the client may need to retain it elsewhere or discuss an appropriate course of action with their relevant professionals.

6. The Wealth Manager Manages the Portfolio; the Bank Executes and Records

Once the account is funded and the mandate is active, the wealth manager implements the agreed portfolio strategy. Orders are transmitted to the custodian bank, which executes or routes the transactions, settles them, updates the account records and issues trade confirmations. The bank also records cash movements, interest, dividends and other account activity.

The division of responsibilities is important. The wealth manager decides how to manage the portfolio within the mandate. The custodian bank holds the assets and performs the account-level operations. The client remains the owner of the account and can review the bank’s records independently of the wealth manager’s portfolio reporting.

The Account-Opening Process at a Glance

WHVP guides the client through each stage, coordinates with the custodian bank and explains what documents or decisions are needed next. The bank retains final authority over its compliance review and whether the account is accepted.

7. Statements, Tax Documents and Ongoing Monitoring Continue After Opening

A custody relationship continues well beyond the initial transfer. The bank provides periodic account statements, transaction confirmations and secure account access according to its service model. It also provides the relevant annual tax-reporting documents available for the account. WHVP does not generate the client’s tax reports; clients use the bank’s documents together with their own records and qualified U.S. tax professionals.

Holding an account outside the United States does not remove U.S. filing obligations. The IRS explains that certain foreign financial assets may need to be reported on Form 8938 and that separate FBAR requirements may also apply. The IRS provides a comparison of Form 8938 and FBAR requirements. Individual filing obligations depend on the client’s facts, account values and ownership structure, so the client should obtain personalized tax advice. Clients should review Form 8938, FBAR and any other filing requirements with a qualified U.S. tax professional. WHVP does not prepare tax returns or provide tax advice.

The bank and wealth manager may also need updated information over time. A change in residence, citizenship, employment, beneficial ownership, authorized signatories or source of assets should be communicated promptly. Banks may periodically refresh identification and compliance documents even when the account activity has not changed.

What the Custodian Bank Does and Does Not Do

For a U.S. client, the clearest way to understand the arrangement is to separate custody from portfolio management:

• The custodian bank holds the account, safeguards the financial assets, processes transactions and maintains the official records.
• The wealth manager manages the portfolio according to the written mandate and communicates the investment strategy.
• The client owns the assets, provides accurate information, reviews the agreements and remains responsible for personal tax and legal obligations.
• The custodian bank may provide tax-reporting documents, but it does not replace the client’s U.S. tax professional.
• Neither Swiss custody nor international diversification guarantees investment performance or eliminates market, currency, regulatory or custody risk.

A Practical Checklist Before Opening an Account

• Confirm that the proposed bank accepts U.S. clients with your residence and ownership structure.
• Ask which identification, source-of-wealth and source-of-funds documents will be required.
• Understand the bank’s minimum asset level, custody fees, transaction charges and online-access options.
• Review the portfolio-management mandate and the limits of the wealth manager’s authority.
• Confirm which assets can be transferred and which may need to remain at another institution.
• Identify which annual statements and tax-reporting documents the custodian bank provides.
• Discuss Form 8938, FBAR and other possible obligations with a qualified U.S. tax professional.

The Process Is Detailed Because the Relationship Is Transparent

A Swiss custody account for a U.S. client is not anonymous and is not opened through a shortcut. It is a documented relationship involving the client, the custodian bank and, where appointed, an independent wealth manager. The bank verifies the client and the assets, the wealth manager operates within a written mandate, and the client receives records directly from the institution holding the account. Throughout the process, WHVP helps the client move from custodian selection and documentation through funding and ongoing portfolio management.

That structure answers the central question behind the article: a Swiss custodian works for a U.S. client by holding and administering the account, applying the required due diligence, executing and recording portfolio transactions, and providing the documentation that allows the client to monitor the relationship and meet applicable reporting responsibilities.

Understand the Process Before Opening a Swiss Custody Account

WHVP guides American clients through each step, from evaluating suitable Swiss and Liechtenstein custodian banks and preparing account-opening documentation to establishing the portfolio-management mandate. The custodian bank makes the final account-opening decision and provides the relevant account and tax-reporting documents.

Schedule a free consultation today to explore how international diversification can strengthen your financial future.

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This content is for informational purposes only and does not constitute investment advice, legal advice, tax advice, or an offer or solicitation to buy or sell any security. Account eligibility, documentation and services vary by institution and individual circumstances. Investing involves risks, including the possible loss of principal. International investing may involve additional currency, political, regulatory, liquidity and custody risks. WHVP AG is regulated in Switzerland by FINMA and is an SEC-registered investment adviser. Registration or licensing does not imply endorsement and does not guarantee investment outcomes. U.S. persons should consult their qualified tax and legal advisers regarding cross-border planning and reporting considerations.