Pillar 3a Retroactive Buy-In

Pillar 3a Retroactive Buy-In is a pension catch-up regulation implemented in Switzerland starting in the 2026 tax year. Under this rule, individuals can close contribution gaps from missed years (e.g., due to studying, career breaks, or moving to Switzerland) up to 10 years back. Gaps can only be filled for years starting from January 1, 2025, onwards. Gaps arising in 2024 or earlier cannot be filled retroactively under the new legislation.

To be eligible to make a catch-up payment, the taxpayer must have already paid the maximum ordinary annual Pillar 3a contribution (CHF 7,258 in 2026) for the current year, and must have had AHV-taxable income in both the year the gap occurred and the year the buy-in is made. Additionally, the maximum catch-up buy-in allowed in a single calendar year is capped at CHF 7,258 for salaried employees, and each gap year must be closed with a single, one-time payment. If combining multiple gap years in one payment, the combined total cannot exceed CHF 7,258—any excess from the final gap year is forfeited.

Real-World Example Martin moved to Switzerland in 2025 and missed making Pillar 3a contributions for 2025, 2026, and 2027 due to not understanding the system. In 2028, he decides to use retroactive buy-ins. He first contributes the maximum CHF 7,258 for 2028 (current year requirement). He then makes a CHF 7,258 retroactive buy-in to close his 2025 gap. In 2029, after maxing out his 2029 contribution, he makes another CHF 7,258 buy-in to close his 2026 gap. In 2030, he closes his final 2027 gap. Each buy-in provides full cantonal and federal tax deductions, saving him approximately CHF 2,500 per year (35% marginal rate × CHF 7,258).