Switzerland

Tax-deferred employer plans

Pillar 2 (BVG/LPP, Pensionskasse) is Switzerland's mandatory occupational pension. Employers with employees earning above the entry threshold must provide Pillar 2 coverage. The plan is structured as a foundation (Stiftung) or cooperative, and both employer and employee contribute. The exemption is available only to an ‘eligible individual’ under §5.02: someone who is compliant (or comes into compliance) with U.S. income-tax filing and has reported the plan’s contributions, earnings, and distributions as income to the extent U.S. law requires; a participant who never reported plan earnings cannot rely on it until they do.

§301.7701-7 classification: Likely a foreign trust (Pensionskassen are foundations, not trusts per se; no IRS guidance). Swiss Pensionskassen are trust-like foundations under Swiss law (Stiftungsrecht), supervised by cantonal pension supervisory authorities and the federal Oberaufsichtskommission BVG (OAK BVG). Failing either test makes a trust foreign; these fail the court test (and the control test as well).

Rev. Proc. 2020-17 analysis: Pillar 2 plans are tax-favored (tax-deductible contributions, tax-free growth until distribution), government-regulated, report annually to Swiss regulators, are broadly available to employed persons above the salary threshold, and participation is mandatory (nondiscriminatory). Large Pensionskassen with hundreds or thousands of members operate as nondiscriminatory employer plans and likely satisfy all Section 5.03 conditions. These plans likely qualify for Rev. Proc. 2020-17.

Small or closely held Pensionskassen may not satisfy the nondiscrimination condition.

Vested benefits accounts (Freizügigkeitskonto): When leaving an employer, Pillar 2 benefits are transferred to a vested benefits account at a bank or insurance company. These are individual accounts; §5.03(6) does not apply. As rollover vehicles, ongoing contributions are not expected, so conditions (3) and (4) are moot. The key question is condition (5): the withdrawal rules (home purchase, self-employment, disability, death, permanent departure, or reaching five years before AHV reference age) raise the same permanent-departure question as Pillar 3a. Unless that analysis confirms qualification, Freizügigkeitskonten require full reporting.

Treaty provisions: Article 18 makes private pensions taxable only in the recipient's State of residence, but Article 1(2) lets the U.S. tax its citizens as if the treaty did not exist and Article 1(3) contains no Article 18 exception, so a U.S. citizen is taxed by the U.S. on Pillar 2 and Pillar 3a payments and on annual accruals if the plan is a foreign trust; relief comes only through the foreign tax credit. The treaty has no accrual-deferral provision and does not affect §6048 reporting.

3520/3520-A treatment: If the Pensionskasse qualifies under Rev. Proc. 2020-17, no forms required. Vested benefits accounts (individual) that don't qualify require full reporting: Form 3520-A and Form 3520 Part II annually. Lump sum withdrawals (Kapitalbezug) or pension payments go on Part III, unless the payout is from an employer plan’s trust and reported as compensation income (see the note at the end of this section).

For a plan an employer contributes to, a trust holding it is generally a nonexempt employees’ trust described in §402(b). §6048(a)(3)(B)(ii) excepts transfers to §402(b), §404(a)(4), and §404A trusts from Part I, the participant’s own contributions included, and §679 does not make the participant the owner (see the Reporting Guide’s employer-plan section). Payouts the participant reports as compensation income are excepted from Part III. If the participant’s own contributions ever exceed the employer’s, the participant is treated as the owner of the part those contributions fund (Treas. Reg. §1.402(b)-1(b)(6)), reports it on Part II and Form 3520-A each year it is owned, and is taxed on its income each year. In that count, what the participant chose to put in, salary sacrifice included, is the participant’s, and anything the plan’s rules required taken from pay is the employer’s, as the IRS chief counsel read a national retirement fund in 1997. The rest is taxed when it vests and, after that, when paid out (§402(b)(1), (2)).

Tax-deferred individual plans

Pillar 3a is a voluntary, tax-advantaged individual retirement savings account held with a bank (3a bank account or 3a securities account) or insurance company (3a insurance policy). Contributions are tax-deductible in Switzerland up to an annual maximum.

§301.7701-7 classification: Likely a foreign trust (a 3a bank account or insurance policy may not be a trust at all; no IRS guidance). Pillar 3a is a trust-like arrangement under Swiss pension law, with assets held by the institution for the benefit of the individual.

Rev. Proc. 2020-17 analysis: Pillar 3a is an individual plan, so §5.03(6) (the employer-plan condition) does not apply; it need only satisfy §5.03(1)–(5). Contributions are deductible and growth is tax-deferred (condition 1); providers report to the Swiss tax authorities (2); only persons with AHV-liable earned income may contribute (3); and contributions are capped at CHF 7,258 a year for those with a pension fund, or the lesser of 20% of earned income and CHF 36,288 without one (4), for 2025 and 2026, and at CHF 7,373 and CHF 36,864 from 2027, all well inside the $50,000 limit. Withdrawals are generally restricted until five years before the AHV reference age, with early access for an owner-occupied home, self-employment, full disability, death, or permanent departure from Switzerland. Home purchase is expressly permitted by §5.03(5); permanent departure is not among the listed reasons, and whether it defeats condition (5) is unresolved (the same issue as Singapore CPF and Hong Kong MPF). Pillar 3a is a strong candidate for the exemption with that one open question.

Treaty provisions: None for a U.S. citizen (see above).

3520/3520-A treatment: If Pillar 3a qualifies under Rev. Proc. 2020-17, no forms are required. If it does not, full reporting applies: Form 3520-A and Form 3520 Part II annually. Report contributions, interest or investment returns, and the opening/closing balance. Pillar 3a accounts are simpler to report than Pillar 2: the individual holds a single account with clear annual statements.

Penalties and practical notes

A U.S. person working in Switzerland typically has both a Pillar 2 and Pillar 3a account, each potentially requiring its own 3520-A.

Swiss pension providers issue annual certificates: the Vorsorgeausweis (Pillar 2) shows contributions, projected benefits, risk premiums, and vested amount; Pillar 3a annual statements show contributions, returns, and balances.

The Swiss tax year is the calendar year: no conversion needed.

Swiss tax is withheld at source on Pillar 2 and 3a payments made to recipients living abroad (Swiss residents instead pay a separate, reduced tax on lump sums). Either tax may be creditable against U.S. tax through the foreign tax credit (Form 1116), depending on the character of the payment.

Convert Swiss francs at the rate prevailing when each amount is received, paid, or accrued; the IRS has no official exchange rate and generally accepts any posted rate used consistently, so its published yearly average rate is a common choice for amounts arising evenly across the year.