A missed 2025 deposit now has a route back
Mara was employed in Switzerland and belonged to an occupational pension fund throughout 2025. She paid CHF 2,000 into pillar 3a rather than the permitted CHF 7,258, leaving an assumed CHF 5,258 gap. In 2026 she can first pay the ordinary CHF 7,258. Subject to the statutory conditions and her provider’s records, she can then buy back the 2025 gap as a single CHF 5,258 payment. Her 2026 3a cash outlay would be CHF 12,516. It would be wrong to tell her she may buy back a missed 2024 contribution, or to send the buyback before she has made the full 2026 ordinary deposit.
The Federal Social Insurance Office (FSIO) says 2026 is the first year for retroactive 3a purchases, beginning with gaps from 2025. This practical new rule belongs inside the familiar Swiss three-pillar structure; it does not change the compulsory AHV or occupational pension into optional investment products.
Place the 3a account inside all three pillars
The Swiss government’s overview describes pillar 1 as the state AHV/OASI insurance providing a basic retirement income. Pillar 2 is the occupational pension fund for eligible employees and complements AHV. Pillar 3 is voluntary private provision; the tax-restricted 3a and more flexible 3b must not be blended into one “tax-free account.” A 3a contribution can reduce taxable income under its rules, but a withdrawal is separately taxed. Ordinary 3b savings generally lack the same contribution deduction.
The Swiss government’s pillar 2 guide says mandatory occupational coverage generally applies when an AHV-insured employee earns at least CHF 22,680 a year, subject to other eligibility conditions. The employer and employee finance the fund under its terms. Membership matters to Mara’s 3a ceiling: someone with a pension fund uses the “small” 3a limit. A self-employed worker without pillar 2 can use the larger percentage-based ceiling. Merely choosing not to contribute to a fund does not make an employee eligible for the self-employed ceiling.
The 2026 AHV context is also different from an older static pension guide. The FSIO says eligible AHV old-age pensioners receive a 13th monthly payment in December 2026 for the first time. It is an old-age benefit, not a 13th payment for every survivors’ pension. Men’s reference age is 65 in 2026; for women born in 1962 it is 64 years and six months under the staged transition. None of these changes make 3a balances liquid on demand.
Calculate Mara’s ordinary limit and buyback separately
The FSIO contribution page gives the 2026 small contribution as CHF 7,258. For self-employed people without an occupational scheme, it is 20% of income up to CHF 36,288. Her 2025 shortfall is CHF 7,258 minus CHF 2,000, or CHF 5,258. The FSIO’s buyback rule caps the additional annual purchase at the small contribution limit even for someone whose ordinary self-employed limit is larger.
| Mara’s 3a record | CHF | Treatment |
|---|---|---|
| 2025 amount actually paid | 2,000 | Already a 2025 contribution |
| 2025 unused small-limit gap | 5,258 | Potential buyback, if eligible |
| Full ordinary 2026 payment | 7,258 | Must precede a buyback |
| 2026 payment plus possible buyback | 12,516 | Two distinct 2026 contributions |
Mara’s 2025 gap and possible 2026 deposits
The buyback is deducted in the year paid, not used to amend an earlier return simply because it relates to an old gap. Mara must have been eligible to make 3a contributions in the missing year and again in the buyback year, including relevant Swiss AHV-liable earned income. FSIO says the ordinary contribution must be fully made first and a gap for a particular year must be closed in one payment. The possibility to go back up to ten years is a rolling window starting with 2025, not permission to reconstruct the prior decade before the rule began.
A deduction is not a guaranteed investment return
If Mara hypothetically faces a 30% combined marginal income-tax rate on the whole CHF 12,516 deduction, a first-pass tax illustration is CHF 3,754.80: CHF 7,258 × 30% = CHF 2,177.40 on the ordinary payment and CHF 5,258 × 30% = CHF 1,577.40 on the buyback. The rate is an assumption, not a Swiss nationwide rate. Federal, cantonal and communal taxes, other deductions, and the exact taxable-income bands determine her result; part of a large deduction may cross into a lower marginal band.
Illustration at an assumed 30% marginal tax rate
The government 3a explainer notes the deduction on contributions and the separate one-off taxation when 3a is withdrawn. That later tax, provider charges, interest or investment losses mean CHF 3,754.80 is not a risk-free gain. If she funds 3a through an equity product, market value can fall; if she uses a cash account, inflation and low interest may erode purchasing power. Compare the product and the period until withdrawal rather than buying a product solely to claim a deduction.
The ordinary 2026 contribution must reach her 3a account by 31 December 2026 to count for this year, according to FSIO. A transfer ordered at the last minute may settle too late. She should obtain a 2025 contribution statement, 2026 payment confirmation and provider documentation for the buyback before filing. The amount the tax office accepts may differ if she had no qualifying income or if the institution has a different recorded 2025 gap.
Two limits that do not move together
The larger CHF 36,288 figure is not a blanket 3a entitlement. It is a ceiling on the 20%-of-income ordinary contribution available to a qualifying person without a pillar 2 plan. For instance, at CHF 100,000 of relevant self-employed income, the ordinary formula yields CHF 20,000 rather than CHF 36,288. By contrast, Mara’s employee-with-fund ceiling is CHF 7,258. The additional annual buyback ceiling remains the small contribution amount, even if the self-employed ordinary ceiling is larger.
The FSIO’s detailed third-pillar page also explains why a 3a buyback cannot simply be treated as unlimited pension-fund backfilling. The provider and tax authority track the year of the gap and the year of purchase. The purchase requires full current-year funding first. A worker who skipped 2025 entirely may potentially buy back CHF 7,258 in 2026, while Mara can only fill her actual CHF 5,258 shortfall. If one already paid the 2025 maximum, there is no 2025 gap to buy back.
Pillar 1 and 2 statements still matter. Mara should check her AHV contribution record for gaps and her pension-fund statement for insured salary and projected benefits; these are not replaced by a 3a account. The government third-pillar guide lists limited early withdrawal grounds, such as owner-occupied housing, permanent departure from Switzerland and qualifying self-employment. Do not rely on a 3a balance as a general emergency fund. The choice of cash or securities within 3a should reflect time horizon and ability to bear loss.
