Estate Planning for US Expats in Switzerland: Why It Matters and How to Get It Right

Why Estate Planning Is Different When You Live in Switzerland

You've built a life in Switzerland—a career, a home, maybe Swiss real estate, pillar 2 and 3a accounts, perhaps a non-US-citizen spouse and children who hold multiple passports. When you think about what happens to all of this after you're gone, the complexity hits immediately: two countries, two tax systems, two sets of inheritance rules, and no automatic coordination between them.

Most US expats assume estate planning means avoiding US federal estate tax. That was true when the exemption sat at $5 million. But the 2026 One Big Beautiful Bill Act (OBBBA) raised the federal exemption to $15 million per person—$30 million for a married couple using portability—indexed for inflation from 2027. The tax rate above that threshold is 40 percent, but if your worldwide estate sits below $15 million, US federal estate tax simply doesn't apply.

That shifts the planning challenge. For Americans living in Switzerland, the real friction now comes from Swiss cantonal inheritance taxes, forced heirship rules that dictate who inherits what, the statutory treatment of pension assets, and the mechanics of coordinating wills, beneficiary designations, and asset titling across two jurisdictions. Get it wrong, and your heirs face conflicting legal claims, frozen accounts, double taxation, or expensive litigation to untangle what you intended.

The US Side: Estate Tax Treaty and the $15 Million Exemption

The US taxes your worldwide estate if you're a citizen or green-card holder, regardless of where you live. The good news: the 2026 exemption means most expats in Switzerland won't owe US federal estate tax. The estate files Form 706 if the gross estate exceeds the filing threshold, reports all worldwide assets at fair market value, and calculates tax only on amounts above $15 million per person.

Switzerland and the US signed an estate tax treaty in 1951. If you're a Swiss resident at death, the treaty provides proportional relief: you calculate what portion of your worldwide estate consists of US-situs assets (US real estate, US securities, certain tangible property in the US), apply the treaty formula, and claim a proportional exemption. For most expats whose wealth sits primarily in Swiss real estate, Swiss bank accounts, and pension pillars, the treaty rarely matters—the $15 million exemption already covers the entire estate.

The treaty does matter if you hold significant US real estate or a large portfolio of US stocks outside retirement accounts. In that case, the proportional calculation can reduce or eliminate US estate tax on the US-situs portion. Your executor will need both a US and a Swiss estate inventory to apply the treaty correctly.

Non-US-Citizen Spouses and the QDOT Requirement

If your spouse is not a US citizen, the unlimited marital deduction disappears. Normally, assets passing to a US-citizen spouse at death are fully deductible—no estate tax, no matter the amount. But the IRS does not extend this to non-citizen spouses, even if they're Swiss nationals or long-term US residents.

Instead, you establish a Qualified Domestic Trust (QDOT). The QDOT holds assets for your surviving spouse's benefit, allows income distributions during their lifetime, but defers US estate tax on the principal until distributions or the spouse's death. At least one trustee must be a US citizen or domestic corporation, and the trust must meet IRS structural requirements. If you don't set up a QDOT and your estate exceeds the exemption, transfers to your non-citizen spouse are immediately taxable.

This matters even at lower estate values if you expect appreciation. A $10 million estate today may exceed $15 million by the time the second spouse dies, especially if Swiss real estate or investments grow. The QDOT preserves flexibility: your spouse receives income and limited principal, the trust holds the rest, and your heirs eventually inherit without triggering tax twice.

Swiss Inheritance Rules: Cantonal Taxes and Forced Heirship

Switzerland has no federal inheritance tax. Instead, all 26 cantons operate their own regimes. Rates, exemptions, and who gets taxed vary dramatically. Zürich exempts spouses and direct descendants entirely. Geneva taxes even direct heirs, though at low progressive rates. Schwyz has no inheritance tax at all. If you live in Vaud, your heirs pay; if you move to Zug, they might pay nothing.

Cantonal tax applies based on your tax residence at death. If you lived in Zürich and your children inherit your estate, they pay zero cantonal tax. If you lived in Bern, they pay a percentage based on the value and their relationship to you. For expats, this creates planning leverage: moving cantons can save your heirs tens of thousands of francs in tax, with no change to your lifestyle.

Forced heirship is the bigger structural constraint. Swiss succession law reserves a statutory portion of your estate—called the reserved share—for certain family members. Spouses receive a reserved share of one-quarter to one-third, depending on whether there are children. Children collectively receive one-third to two-thirds, depending on whether a spouse survives. The 2023 reform reduced these shares slightly and allows dual citizens to elect the law of their other nationality, but you cannot bypass forced heirship entirely.

What this means practically: you can't disinherit your spouse or children. If you leave everything to a charity or a sibling, your spouse and children can claim their reserved shares, and a Swiss court will enforce those claims against your estate. You have freedom only over the disponible portion—the fraction not reserved by law. For Americans used to full testamentary freedom, this feels restrictive. For Swiss succession planning, it's the baseline.

Pillar 2 and 3a: Assets That Pass Outside Your Will

Your pension assets—pillar 2 (occupational pension) and pillar 3a (tied private pension)—do not pass through your will. Instead, they transfer under statutory beneficiary rules set by Swiss pension law. For pillar 2, your spouse receives a statutory survivor's pension or lump sum. For pillar 3a, the beneficiary order is fixed by law unless you file a specific election with your 3a provider.

This creates two practical problems. First, if you want your children or a charity to inherit your 3a balance, you must file a beneficiary designation that overrides the statutory order—and not all providers allow every permutation. Second, for US tax purposes, distributions from pillar 2 or 3a to your heirs are income in respect of a decedent (IRD): taxable to the recipient as ordinary income, with no step-up in basis. Understanding how your Swiss pension plans interact with US tax reporting helps your heirs avoid surprise tax bills when they inherit.

Coordinate your pension beneficiary designations with your will. If you leave your disponible share to one child and your pillar 3a passes automatically to your spouse under statutory rules, you may inadvertently create an imbalanced inheritance that triggers family disputes. Your estate planner should review pension documents alongside your will and trust structures.

Trusts, Swiss Real Estate, and the February 2026 Lex Koller Ruling

Many US expats think about revocable living trusts—standard planning in the US to avoid probate and centralize asset management. In Switzerland, trusts are recognized but rarely used for succession, and the February 2026 Swiss Supreme Court decision added a new wrinkle: any trust holding Swiss real estate must comply with Lex Koller, the federal law restricting foreign ownership of real property.

The court ruled that transferring Swiss real estate into a trust constitutes a change of beneficial ownership, triggering Lex Koller authorization requirements unless the transfer falls within a statutory exception. Transfers to a spouse or direct-line descendants (children, grandchildren) are exempt. Transfers to a trust for the benefit of non-family members or discretionary beneficiaries require cantonal approval, which is rarely granted.

For Americans in Switzerland, this limits the utility of US-style revocable trusts holding Swiss property. If you transfer your Zürich apartment into your California revocable trust, the cantonal land registry may refuse the transfer unless you and your beneficiaries qualify for the family exemption. The 2026 Supreme Court ruling clarified that even trusts for estate planning purposes fall under Lex Koller if they hold Swiss real estate, closing what some advisors previously treated as a gap.

The practical workaround: hold Swiss real estate in your personal name or joint tenancy, and use your Swiss will to control succession. If you want trust-like control—say, income to your spouse for life, then principal to your children—draft your Swiss will with a usufruct (lifetime use right for your spouse) or a succession pact coordinated with forced heirship rules. Complex, but enforceable without triggering Lex Koller.

Coordinating Wills: One Document or Two?

You need a will that works in both jurisdictions. The question is whether to draft a single worldwide will or separate US and Swiss wills covering different assets. Both approaches have tradeoffs.

A single worldwide will is simpler: one document, one set of instructions, one probate if necessary. You draft it under Swiss law (if you're a Swiss resident) with a choice-of-law clause specifying which jurisdiction's law governs interpretation. The risk: US courts may not fully honor Swiss forced heirship, and Swiss courts may struggle interpreting US trust provisions. If your estate includes assets in both countries, a single will requires careful drafting to satisfy both legal systems.

Separate wills—one Swiss will covering Swiss-situs assets, one US will covering US-situs assets—reduce conflict. Your Swiss will follows Swiss form (handwritten or notarized), includes forced heirship allocations, and names a Swiss executor. Your US will follows state law, addresses US real estate and financial accounts, and names a US executor. The danger: if the wills aren't carefully coordinated, they can accidentally revoke each other (most wills open with 'I revoke all prior wills'), or create conflicting instructions for jointly held assets or digital accounts accessible from both countries.

Best practice: work with an advisor who drafts both wills simultaneously, includes a non-revocation clause in each ('this will revokes prior wills except my [US/Swiss] will dated [date]'), and specifies asset-by-asset which will governs. The Swiss will covers Swiss real estate, Swiss bank accounts, pillar assets (by reference, since they pass by designation). The US will covers US property, US brokerage accounts, and serves as a fallback for anything not explicitly covered by the Swiss will.

Executors and Practical Administration

Name executors who can actually act in each jurisdiction. Your Swiss executor needs to be resident in Switzerland or willing to work with a Swiss notary to navigate cantonal probate (if required). Your US executor needs access to US banks and the ability to file IRS forms. Naming your spouse or a child who lives in one country but not the other creates practical delays—bank accounts get frozen, the foreign executor can't easily access records, and cross-border coordination becomes expensive.

Consider naming a professional executor—a Swiss attorney or trustee for the Swiss estate, a US-based trust company for the US estate—if your family lacks someone who can handle both. Professional fees run several percent of the estate value, but they eliminate the risk of deadlock or missed deadlines that trigger penalties.

Life Insurance as Liquidity and Creditor Protection

Life insurance plays two roles in cross-border estate planning: providing liquidity to pay taxes or equalize inheritances, and offering creditor protection under Swiss law. If you own Swiss real estate worth CHF 2 million, pillar 2 assets passing to your spouse, and US brokerage accounts, your heirs may need cash to pay cantonal inheritance tax (if applicable), US estate tax (if your estate grows above $15 million), or to equalize distributions among children when one inherits illiquid property.

A life insurance policy held by a US expat in Switzerland pays a tax-free death benefit to your named beneficiaries. That cash bypasses probate, arrives within weeks of the claim, and gives your executor or heirs the liquidity to settle debts, pay taxes, or buy out a sibling's share without forcing a sale of the family home. Swiss-issued policies also qualify for creditor protection under Swiss insurance law—if structured correctly, the cash value and death benefit are shielded from claims against your estate.

For QDOT planning, life insurance can fund the trust: the policy pays into the QDOT at your death, providing your non-citizen spouse with income and the trust with assets to cover future US estate tax when distributions occur. This avoids having to liquidate appreciated Swiss real estate or pension assets to fund the QDOT.

Common Mistakes and How to Avoid Them

The biggest mistake is doing nothing. You assume your US will from ten years ago still works, or that Swiss law will sort everything out automatically. It won't. If you die without a coordinated plan, your Swiss assets pass under Swiss forced heirship, your US assets pass under your old US will (which may conflict with Swiss law), and your heirs spend months or years in court reconciling the two.

Second mistake: naming only US beneficiaries on Swiss accounts, or only Swiss beneficiaries on US accounts. If your Zürich bank account lists your California-resident brother as beneficiary, the bank may freeze the account pending Swiss probate, and your brother will face US tax on the inheritance as income. Beneficiary designations must match your overall plan and account for the tax treatment in both jurisdictions.

Third mistake: ignoring the treaty and paying double tax. If your estate includes US real estate and you're a Swiss resident, the treaty provides proportional relief—but only if your executor files the correct forms with the IRS and cantonal authorities. Missing the treaty claim can cost your heirs tens of thousands in unnecessary tax.

Fourth mistake: assuming trusts solve everything. Trusts are powerful in the US but constrained in Switzerland. If you try to hold Swiss assets in a US revocable trust without considering Lex Koller, forced heirship, or Swiss probate rules, you create conflicts that make administration more expensive, not less. Use trusts selectively, for specific goals—QDOT for a non-citizen spouse, an irrevocable trust for creditor protection, a dynasty trust for US-situs assets—but don't force every asset into a trust just because it's common practice in California.

Building Your Cross-Border Estate Plan: The Process

Start with an inventory. List every asset, where it's located (US or Swiss situs), how it's titled (joint, individual, beneficiary designation), and its approximate value. Include Swiss real estate, US real estate, bank accounts in both countries, pillar 2 and 3a balances, brokerage accounts, business interests, life insurance policies, and digital assets.

Next, map your family structure. Who are your heirs? Are any non-US citizens? Do you have minor children who need guardianship provisions? Do forced heirship rules in your canton conflict with how you want to distribute your estate? This step identifies where Swiss law constrains your choices and where you have flexibility.

Then model the tax. Calculate your worldwide estate value and compare it to the $15 million US exemption. If you're below, US estate tax is off the table—but you still need to file Form 706 if the gross estate exceeds the filing threshold. Model cantonal inheritance tax based on your canton of residence: Zürich means zero for direct heirs, Geneva or Bern means a percentage based on value and relationship. If your estate might grow above $15 million due to real estate appreciation or business value, model the 40 percent federal rate and consider life insurance or gifting strategies to stay below the threshold.

Draft coordinated wills with an advisor who knows both systems. Your Swiss will should be notarized or fully handwritten (depending on cantonal requirements), include forced heirship allocations, name a Swiss executor, and specify Swiss-situs assets. Your US will should follow your state's execution rules, name a US executor, and specify US-situs assets. Both wills should reference each other and include non-revocation clauses.

Review and update beneficiary designations. Your pillar 3a provider, life insurance company, and any pay-on-death or transfer-on-death accounts need beneficiaries that align with your wills. If your Swiss will leaves your disponible share to your daughter but your 3a automatically passes to your spouse under statutory rules, you've created an imbalance. Coordinate everything.

Finally, document the plan for your heirs. Write a letter of instruction listing where your wills are stored, who your executors are, what accounts exist, and how to contact your Swiss and US advisors. Include login credentials for digital accounts (or instructions for accessing a password manager), and a summary of your intentions—why you structured things the way you did, what you want your heirs to know about forced heirship or the QDOT, and what taxes they should expect.

When to Get Professional Help

Cross-border estate planning is not a do-it-yourself project. You need an advisor who understands both US estate and gift tax rules and Swiss cantonal succession law—not one or the other. The Swiss notary who drafted your neighbor's will may not understand QDOT requirements or the US estate tax treaty. The US estate planning attorney back home may not know about forced heirship or Lex Koller.

You need professional help if: your estate approaches or exceeds $15 million; you're married to a non-US citizen; you own real estate in both countries; you have minor children or dependents with special needs; you own a business with cross-border operations; your pillar 2 or 3a balances are significant and you want control over who inherits them; you're considering a trust structure for asset protection or succession; or you've lived in Switzerland long enough that your asset base is now primarily Swiss but your family ties and some assets remain in the US.

This requires coordination, not just advice. The person drafting your Swiss will must talk to the person drafting your US will. Your Swiss tax advisor needs to model cantonal inheritance tax while your US CPA models federal estate tax. Your life insurance agent needs to understand how the death benefit fits into the QDOT or liquidity plan. One-off consultations with siloed experts create gaps. You want a coordinated plan with clear ownership of each piece.

Ready to coordinate your cross-border estate plan? Schedule a complimentary consultation to review your US and Swiss estate documents side-by-side and identify where conflicts, gaps, or missed opportunities sit.