The three pillars, briefly
Switzerland's pension system has three pillars by design:
- Pillar 1 (AHV/IV) — state pension. Pay-as-you-go, mandatory, ~CHF 2 500/month max at 65.
- Pillar 2 (BVG / LPP) — employer pension fund. Mandatory for salaried employees above CHF 22 680/year. Funded jointly by you + employer.
- Pillar 3a — your private, voluntary, tax-favoured retirement account. The smallest of the three but the most flexible.
Pillars 1 and 2 are largely out of your control. Pillar 3a is the lever you actually pull.
What makes 3a special
Money you put into a 3a account is deducted from your taxable income for the year. At a marginal tax rate of (say) 30 %, every CHF 1 000 you contribute saves you CHF 300 in tax. The money is locked until retirement (or one of a few specific exceptions) but when you take it out, it's taxed at a separate, much lower lump-sum scale.
So the deal:
- Now: deduct contribution from taxable income → instant tax saving at your marginal rate.
- Inside the account: investment growth is untaxed (no income tax on dividends, no wealth tax on the balance).
- At withdrawal: lump-sum tax at a separate cantonal scale, roughly 4–8 % of the balance.
The new retroactive buy-in (from 2026)
Starting tax year 2026, you can retroactively fill 3a gaps from 2025 onward, up to 10 years back, after maxing the current year. Fully tax-deductible. This is a game-changer for anyone who started a Swiss career mid-life or missed contributions during low-income years.
Important: the retroactive contribution counts toward the year you pay it in (not the original gap year), and you can only fill years where you had AHV-relevant income.
How many 3a accounts to open?
You can have up to five 3a accounts. The reason is purely tax-strategic: when you withdraw, lump-sum tax is progressive — bigger withdrawal = higher rate. Splitting your balance across 5 accounts and withdrawing one per year in 5 staggered years stays in the low brackets the whole way through. A typical CHF 350 000 single-account withdrawal at age 65 might be taxed CHF 25–35 k; the same balance split over 5 years can pay CHF 14–22 k. Real money.
Which provider?
Three categories:
- Traditional bank 3a account — pays you ~0.5 % interest. Safe, boring, easy. Right for someone who doesn't want investment risk.
- Traditional bank 3a fund — invests in a 25–45 % equity-allocation fund. Higher long-run returns but bank fees eat 0.8–1.5 %/year.
- Digital 3a (VIAC, Frankly, Finpension, etc.) — 99 % equity allocation possible, fees 0.39–0.55 %, full investment control. Right for anyone with >10 years until retirement who can tolerate volatility.
See our side-by-side 3a provider comparison.
Three traps to avoid
- Forgetting to actually pay it in. Many people sign up for a 3a account, deposit the first year, and forget. Set a yearly standing order for January.
- Locking your money up if you're under 30. 3a is taxed on withdrawal; if your marginal rate today is < ~25 %, the future lump-sum tax + opportunity cost might outweigh the saving. Run our calculator with your numbers.
- Underestimating fees. A 1.5 % bank-fund fee on a CHF 350 000 balance over 30 years costs you ~CHF 130 000. Switch to a digital 3a if you have the appetite.