Third pillar for cross-border workers: what really changes

For a cross-border worker, opening a third pillar can be a smart move — or cash locked away for nothing. The difference isn't the product, but a tax detail almost no one explains: where and how you're taxed.

The third pillar in two lines

The third pillar is Switzerland's private pension and comes in two forms. Pillar 3a (tied) lets you deduct contributions from your taxable income in Switzerland, up to an annual cap (for people with a pension fund, around CHF 7,000 — the amount is updated each year). The capital stays locked until about five years before retirement age, except in specific cases: buying your main home, starting self-employment, leaving Switzerland for good.

Pillar 3b (flexible) has no withdrawal lock — but, as a rule, none of the 3a tax advantage either. The heart of 3a is precisely the tax saving. And that's where a cross-border worker's position flips the reasoning.

The point that changes everything: where you're taxed

The 3a tax advantage only materialises if that income is actually taxed in Switzerland on an ordinary basis. A cross-border worker, however, is usually taxed at source (the tax is withheld directly by the employer), and in that regime the 3a deduction doesn't apply automatically.

The way in is called quasi-residence. Anyone earning at least around 90% of their worldwide income in Switzerland can request a subsequent ordinary assessment and claim deductions, 3a included.

What changed with the cross-border agreement (from 2024)

The new Italy-Switzerland cross-border workers agreement, applicable from 2024, split workers into two categories with different tax consequences:

• «Existing» cross-border workers (already commuting during the reference period): a transitional regime, with taxation that stays largely concentrated in Switzerland for a time.
• New cross-border workers: concurrent taxation — Switzerland taxes at source up to 80%, and Italy taxes the income while granting a credit for the tax already paid in Switzerland.

Why does it matter for 3a? Because the category you fall into and the interplay with Italian tax change how much the Swiss advantage really weighs. There's no one-size-fits-all answer: the maths has to be done on your situation.

3a and Italian tax: the other half of the calculation

Even when 3a is favourable in Switzerland, you have to consider how Italy treats that capital and those pensions, especially for new cross-border workers taxed across the border too. Planning that looks only at the Swiss side can hold surprises on the Italian side. Likewise, it pays to know in advance what happens to your 3a when you stop commuting or leave Switzerland: surrender, transfer and taxation of the capital on withdrawal are not minor details.

So: when is it worth it, and when not

Worth it if…

• you qualify (or can qualify) as a quasi-resident and therefore genuinely use the deduction;
• you have a medium-to-long horizon and want to build pension savings with dedicated capital;
• you're considering buying your main home in Switzerland later (3a can flow into it).

Less worth it if…

• you're taxed only at source with no access to ordinary assessment: the constraint isn't offset by the benefit;
• you need flexible liquidity, where 3b or other solutions fit better.

The right choice depends on your actual tax regime, your income and your goals. It's exactly the kind of assessment best done case by case, with the numbers in front of you.

General information only; this does not replace personalised advice. Tax law and amounts can change: decisions should be based on your specific situation and on figures current for the year in question.