Swiss Pillar 2 & Pillar 3a US Tax: What Americans in Switzerland Need to Know

Swiss pension statements are models of clarity: an account balance, a projected pension, a conversion rate. The US questions they raise are anything but. A Pillar 2 account is funded through employment, compulsory and tax-favoured in Switzerland - three features that, run through the Internal Revenue Code, produce questions that no published IRS guidance located for this article answers for any Swiss plan by name.

This article is aimed at US citizens and green-card holders working or formerly employed in Switzerland who hold Pillar2, vested-benefits or Pillar 3a assets, and at the US tax professionals who prepare their returns. It sets out what each pillar is as the Swiss authorities publish it, then works the US questions in their logical order - treaty, plan character, current taxation, distributions, reporting - labelling at each step what is verified text and what is open.

This article describes how United States federal tax law and the U.S.-Switzerland income tax treaty apply to US persons. It summarises Swiss rules only as published by the Federal Tax Administration(ESTV/AFC), the Federal Social Insurance Office (BSV/OFAS) and the cantonal tax administrations, for context, and is not Swiss tax, legal or succession advice- those questions belong with a Swiss-qualified professional.

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What Pillar 2 and Pillar 3a are, as Switzerland publishes them

Pillar 2 is the occupational pension of the Federal Act on Occupational Old-Age, Survivors' and Invalidity Pension Provision (BVG/LPP): employees already insured for AHV with an annual salary of at least CHF 22,680 are compulsorily insured - lower earners are not, and the self-employed may join only voluntarily - contributions accumulate as retirement capital, and at retirement the mandatory part converts to a pension at a minimum rate of 6.8%; lump-sum (capital) benefits are possible and taxed separately.

The insured salary is coordinated with the AHV: a coordination deduction of CHF 26,460 comes off the salary up to the upper limit of CHF 90,720, with a minimum coordinated salary of CHF 3,780 - the amounts in force from 1 January 2025 and, per the BSV's published key figures, unchanged for 2026. On leaving an employer before retirement, the accumulated capital does not stay behind: it moves as a termination (vested) benefit - Freizügigkeitsleistung - to the next fund or to a vested-benefits account or policy under the Federal Act on Vested Benefits of 17 December 1993.

Pillar 3a is individual, voluntary and tax-favoured in Switzerland: a person with a 2nd pillar may pay in up to CHF7,258 a year, a person without one up to 20% of earned income capped at CHF36,288 (amounts in force from 2025). Under a recent change, gaps arising from2025 onwards can be repurchased up to ten years later - the first such catch-up payment became possible in tax year 2026 for a 2025 gap. Pillar 2 buy-ins(Einkauf) are also possible, with a Swiss tax rule worth knowing before any capital plan: benefits resulting from a buy-in may not be drawn in capital form within the following three years (Article 79b(3) BVG).

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Question one: is it a pension arrangement under the treaty?

Article 18(1) of the U.S.- Switzerland Income Tax Treaty provides that "pensions and other similar remuneration beneficially derived by a resident of a Contracting State in consideration of past employment shall be taxable only in that State." For a Swiss-resident recipient of a Swiss occupational pension, the allocation is to Switzerland; for a US-resident recipient, to the United States. The text names no plan types on either side.

Three limits on that comfort. The treaty nowhere says whether a single vested-benefits cash-out is "pensions and other similar remuneration" - no protocol paragraph or technical explanation passage located addresses lump sums. Article 18 is absent from the saving-clause exceptions in Article 1(3), so the United States taxes its citizens and green-card holders "as if this Convention had not come into effect" and the allocation binds only the Swiss side. And Pillar 3a is individual savings rather than remuneration in consideration of past employment - whether it is Article 18 income at all is simply not addressed in any primary text located.

The one context in which the two governments have named the pillars is elsewhere in the treaty: the competent authority arrangements under Article 10(3), most recently that of 5 December2024 (IRS Announcement 2025-08), which supersedes a 6 May 2021 arrangement and follows an earlier one effective from 1998. The 2024 arrangement lists the arrangements eligible for the dividend exemption: on the Swiss side, BVG/LPP institutions, vested-benefits arrangements under the 1993 Act and "individual recognized pension plans comparable with occupational pension plans" - the Pillar 3a forms; on the US side, Section 401(a) plans including 401(k)s, 403(a) and 403(b) plans, IRAs and Roth IRAs, among others. Those arrangements govern dividends and nothing else; none is authority on how a contribution, accrual or distribution is taxed.

Question two: employer plan, foreign trust, or both?

US law has a default home for a funded foreign employer plan that is not US-qualified: Section 402(b). Employer contributions to a non-exempt employees' trust are included in the employee's income "in accordance with section 83," and amounts "actually distributed or made available" are taxed under Section 72. Whether a given Pillar 2 institution is such an employees' trust is the first characterisation call, and no published guidance makes it for Swiss plans.

The consequences of that call are not small. Under Section 402(b)(1), employer contributions can be current income as they are made; under Section 402(b)(4), an employee who is highly compensated within the meaning of the Code and whose plan fails the relevant coverage tests can be required to include the vested accrued benefit itself, not merely the year's contributions. Whether those provisions bite, and how the employee's own contributions and the fund's investment return are treated in the meantime, is exactly the analysis a US tax professional performs - plan documents in hand, not by analogy to a neighbour's return.

Parallel to the employer-plan question runs the trust question: if a Pillar 2 foundation, a vested-benefits foundation or a Pillar 3a foundation is a foreign trust in which the individual is treated as an owner or from which they receive distributions, Forms 3520 and 3520-A enter the picture. Rev. Proc. 2020-17 exempts an "eligible individual" from that reporting for a "tax-favored foreign retirement trust" - one" created, organized, or otherwise established under the laws of a foreign jurisdiction" to "operate exclusively or almost exclusively to provide, or to earn income for the provision of, pension or retirement benefits."

Its conditions are specific: the trust must be tax-favoured locally; annual information reporting must be "provided, or ... otherwise available, to the relevant tax authorities"; "only contributions with respect to income earned from the performance of personal services are permitted"; contributions must be limited by a percentage of earned income, an annual limit of $50,000 or less, or a lifetime limit of$1,000,000 or less; and withdrawals must be "conditioned upon reaching a specified retirement age, disability, or death," or penalised earlier. Whether a particular Swiss plan meets each condition - a large buy-in year, for instance, invites a careful look at the contribution-limit limb - has not been confirmed in any IRS document located that names Swiss plans, and readers should not assume it has. The exemption also leaves FBAR and Form 8938 obligations expressly untouched.

Question three: are contributions and accruals taxablenow?

In the IRS publications located for this article there is no Swiss-specific answer: none states that Pillar 2 employer contributions are excluded from a US employee's current income, and nothing states that they are included. The statutory framework of Sections 402(b), 83and 72 supplies the questions; a treaty contributions-relief provision is not a feature any located text of this Convention provides for these plans.

In practice this is the point where returns diverge most between preparers, and the honest statement of the law is that the primary sources leave room for judgement. What a household can control is consistency and documentation: one characterisation, applied year over year, chosen with a US tax professional who has read the plan rules - the fund regulations, the vesting terms, the buy-in history - rather than assumed from a summary.

Question four: lump sums, cash-outs and pensions when they arrive

When a Pillar 2 benefit is paid, the IRS's generic rule for foreign pensions applies on the US side: "the taxable amount generally is the Gross Distribution minus the Cost (investment in the contract)," reportable even without a Form 1099. The cost element - what the recipient has already been taxed on - depends directly on the question-three answers, which is why the characterisation chain has to be walked before the first franc moves.

For leavers, Switzerland adds its own fork. On a permanent departure to an EU or EFTA state, the mandatory part of the termination benefit cannot be taken in cash while the person is compulsorily insured there - it goes to a vested-benefits account; on a departure to the United States, cash payment of the full termination benefit is permissible under the AHV/IV leaflet's framework. A capital benefit paid to a recipient abroad carries Swiss withholding at source "independently of any DTA"- federally between 0% and 2.6%, plus cantonal rates that vary - refundable where a treaty allocates the taxing right to the residence state and the residence state's tax authority confirms it.

Within Switzerland, a lump sum from pension provision is taxed separately from other income - federally at one fifth of the ordinary rates under Article 38 DBG, with reduced cantonal rates. Which treaty article governs the same payment on the US side depends on the unresolved lump-sum point above; what is not in doubt is that a US citizen cannot rely on Article 18's "taxable only" language against the United States, because the saving clause keeps the Code in charge. Double relief, where both systems tax, is Article 23 and foreign-tax-credit territory - mapped in the retirement article of this series.

Question five: FBAR, Form 8938 and the PFIC question inside a 3a

Reporting does not wait for the income-tax questions to be resolved. The FBAR reaches foreign financial accounts = bank and securities accounts, mutual funds, "insurance or annuity policies with a cash value" - once the $10,000 aggregate is crossed; Form 8938 lists" an interest in a foreign pension plan" among specified foreign financial assets, with a stated valuation rule when the value is unknown. Neither document names Swiss plans; the mapping below is category matching, not an IRS ruling.

The FBAR guide's named foreign-retirement examples are Canadian and Mexican plans, and its participant exceptions cover US plans under Sections 401(a), 403(a) and 403(b) - not foreign ones. A Pillar3a bank account and a vested-benefits account sit naturally in the bank-account category, and a 3a insurance policy in the cash-value category; how an interest in an employer's active Pillar 2 fund maps is a judgement a preparer should make explicitly and consistently, on the guide's categories.

On Form 8938, the valuation rule is practical: the maximum value of a foreign pension interest is its fair market value on the last day of the year; if that is unknown, distributions received during the year; with no distributions and no known value, zero - with the plan still on the form. Inside a 3a held in funds, the passive foreign investment company tests of Section 1297 - 75% passive income or 50% passive assets - are the usual analysis for foreign-domiciled funds; whether a foundation-held 3a is looked through to its funds is, like so much here, unaddressed in the primary sources.

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A reporting-flow illustration, not a tax computation

The illustration below traces where two common Swiss accounts appear across one year's US filings. It computes no tax, assumes no investment return and no exchange rate, and takes no position on the open characterisation questions - it shows which forms carry the accounts, which is the part households most often get wrong.