What's changing in 2026
Three notable shifts. First, the annual cap for employees with Pillar 2 rises to CHF 7,258 (vs CHF 7,056 in 2025). For self-employed without Pillar 2, the cap goes to CHF 36,288 (20% of net income, capped). Second, the headline rule: ability to retroactively fill the gaps of the past 10 years. Third, some insurers launch hybrid 3a products combining guaranteed capital with equity funds — useful for in-between profiles.
The retroactive buy-in: the real news
In practice: if between 2016 and 2025 you contributed less than the annual cap each year, you can now pay the cumulative difference — up to roughly CHF 21,000 extra (on top of your 2026 contribution). The tax benefit is immediate: at a 30% marginal rate, the CHF 21,000 buy-in saves CHF 6,300 in tax this year. Conditions: you must have been insured during those years, and the buy-in must go to an active 3a account. Check your contribution history with your current 3a foundation.
Who benefits most
The retroactive buy-in is especially valuable for: (1) young workers who couldn't fund 3a early in their careers, (2) self-employed after years of growth, (3) returning expats, (4) anyone with multi-year gaps (long illness, sabbatical, career change). Conversely, if you're near retirement with no tax optimization left, the relative benefit shrinks. Polia advises spreading buy-ins over 2-3 years to stay in favorable tax brackets.
Practical method
Step 1: gather 3a tax certificates for the past 10 years. Step 2: sum each year (actual contribution - annual cap). The cumulative positive gap is your buy-in capacity. Step 3: open or pick a low-fee digital 3a account (Viac, Frankly, Yuh, Selma) to avoid 1-1.5% fees at traditional banks. Step 4: execute the buy-in before December 31 to benefit from the deduction this year. Step 5: keep the receipt to attach to your tax return.
