Pillar 3a and Swiss pensions: US tax issues

Your Swiss coworkers will tell you pillar 3a is a no-brainer. For an American, it's a maybe, and the reason is the IRS.

The short version

Switzerland has three pillars: the state pension (AHV/AVS), the occupational pension through your employer (BVG, pillar 2), and private savings (pillar 3a and 3b).
The 2026 pillar 3a maximum is CHF 7,258 (about USD 8,820) if you have a pension fund, or 20% of earnings up to CHF 36,288 (about USD 44,090) if you don't. For 2027 the caps rise to CHF 7,373 and CHF 36,864 [1].
Swiss tax breaks don't carry over to your US return. The US doesn't recognize the 3a deduction, and how the IRS treats the growth inside pillars 2 and 3a is not settled.
3a funds are a PFIC risk. Most Swiss 3a investment products hold Swiss or European funds, and those can be PFICs under US tax law.
This is general information. A US expat tax preparer can check how your own accounts should be reported.

USD conversions use the Federal Reserve H.10 rate of October 30, 2026 (USD 1 = CHF 0.8230).

The three pillars in plain English

Here's the Swiss system next to its closest US cousins:

Swiss pillar	What it is	Closest US equivalent
Pillar 1: AHV/AVS	State old-age and survivors' pension, funded by payroll contributions	Social Security
Pillar 2: BVG/LPP (occupational pension)	Employer pension fund, mandatory above an income threshold; you and your employer both contribute	A 401(k) or company pension plan, but mandatory
Pillar 3a	Tax-favored private retirement savings, capped each year, money locked until close to retirement	A traditional IRA
Pillar 3b	Ordinary savings and some insurance products, with few tax perks	A regular taxable account

Some numbers from the Federal Council's October 2, 2026 announcement [1]:

AHV pensions for a full contribution record run from CHF 1,260 to CHF 2,520 a month in 2026, rising to CHF 1,280 to CHF 2,560 from January 1, 2027.
The pillar 2 entry threshold is CHF 22,680 in annual pay for 2026, rising to CHF 23,040 in 2027. Earn less than that from one employer and the mandatory occupational pension doesn't kick in.

The US and Switzerland have a Social Security totalization agreement, so you generally pay into only one system at a time and can combine work credits for eligibility. That handles pillar 1 cleanly. Pillars 2 and 3a are where the US tax questions start.

Pillar 3a: how it works for the Swiss

Pillar 3a is the classic Swiss tax-saver. You pay in each year, deduct the contribution from your Swiss taxable income, and the money grows tax-free in Switzerland until you withdraw it near retirement (or earlier for buying a home you live in, starting a business, or leaving Switzerland for good, among other cases).

Year	Max if you're in a pension fund (pillar 2)	Max if you're not
2026	CHF 7,258 (about USD 8,820)	20% of net earnings, up to CHF 36,288 (about USD 44,090)
2027	CHF 7,373 (about USD 8,960)	20% of net earnings, up to CHF 36,864 (about USD 44,790)

Source: Federal Council [1].

There are two flavors:

3a bank accounts: cash savings at a bank, paying interest.
3a securities solutions: the money goes into investment funds, often Swiss-domiciled funds offered by the bank or a pension app.

That second flavor is where Americans need to be careful.

How the IRS may treat Swiss pensions

Here's the honest answer: there's no single IRS ruling that says "this is how pillar 2 and pillar 3a are taxed." Practitioners disagree, and positions vary with the facts of each account. What follows is the general landscape, not a verdict.

What's fairly clear

No US deduction for 3a contributions. The Swiss deduction lowers your Swiss tax only. On your US return, your 3a contributions come out of after-tax income.
Reporting doesn't go away. Your pillar 2 and 3a accounts generally belong on your FBAR and, above the thresholds, on Form 8938 [5]. The IRS revenue procedure on foreign retirement trusts says plainly that it "does not affect any reporting obligations under section 6038D," which is the Form 8938 rule, and doesn't affect the FBAR [2].
Form 3520 relief may apply. Rev. Proc. 2020-17 exempts certain "tax-favored foreign retirement trusts" from Forms 3520 and 3520-A [2]. The conditions include being tax-favored at home, reporting to the home tax authority, contributions limited to income from personal services and capped (USD 50,000 a year or USD 1,000,000 lifetime), and withdrawals tied to retirement age, disability or death, or penalized if early [2]. Many practitioners think pillar 2 and pillar 3a fit; whether yours does depends on the plan.

What's debated

Is the growth taxable each year? Practitioners generally read the US–Swiss tax treaty as lacking a clear clause, like the one in the US–UK treaty, that defers US tax on growth inside a foreign plan. Some advisers treat pillar 2 as a foreign employer pension and defer tax until distribution. Others argue for reporting the employer contributions or the yearly growth as income, depending on how the plan is structured.
Is pillar 3a a pension or a savings account? A US–Swiss competent authority agreement on dividend withholding recognizes Swiss occupational pension arrangements set up under the BVG law as pension schemes, but expressly excludes "any form of contributory private savings plans or other individual savings plans" [3]. That agreement is only about withholding tax on dividends, but it shows that the US and Swiss authorities treat pillar 2 and personal savings plans differently. Many US tax professionals treat 3a with more caution than pillar 2 for this reason.
How is the payout taxed? Lump-sum withdrawals, which are common in Switzerland, can create a large US taxable event in a single year, offset partly by Swiss tax through the foreign tax credit.

The PFIC trap in 3a funds

A PFIC (passive foreign investment company) is, roughly, any non-US fund. The US taxes PFIC gains in a deliberately unpleasant way: gains are spread back over your holding period, taxed at the top rate for each year, and charged interest. The paperwork is Form 8621, usually one per fund per year.

Most 3a securities solutions invest in Swiss or European funds, so on their face they hold PFICs. There are two possible ways out:

The pension exception. The Form 8621 instructions say that in certain situations a person in a treaty-qualifying foreign pension arrangement "is not required to complete Part I with respect to the PFIC," citing Regulations section 1.1298-1(c)(4) [4]. Whether a 3a account qualifies, given that the competent authority agreement leaves individual savings plans out [3], is exactly the point practitioners argue about.
The small-balance exception. You can skip Part I if your total PFIC holdings are USD 25,000 or less on the last day of the year (USD 50,000 on a joint return) and you had no excess distribution or gain [4]. It only helps while your balances are small.

Many Americans in Zurich land on a simple compromise: use a 3a bank account (cash) to get the Swiss deduction without holding funds, or skip 3a and invest through a US-based account instead. Neither is right for everyone, especially if you plan to stay in Switzerland for good.

A checklist before you open a 3a

Ask how much the Swiss deduction actually saves you at your marginal Swiss rate.
Decide between cash and funds. Cash avoids the PFIC question; funds may not.
Ask your US tax preparer how they'd report the account each year, and what that costs.
Think about where you'll retire. If you'll move back stateside, the withdrawal timing and US tax on the payout matter.
Keep every annual statement. You'll need values in CHF and USD for your FBAR and Form 8938.

Pensions and US taxes are a favorite topic in our community group for Americans in Switzerland, and members are candid about what their preparers recommended.

Pillar 3a and Swiss pensions: what the IRS sees when you save for retirement in Zurich