Who may top up their Pillar 3a?
Pillar 3a voluntary buybacks (also called Nachkauf or Wiedereinkauf) are a special form of Pillar 3a contribution: instead of paying one annual amount, you transfer a larger one-off sum that the foundation allocates across several earlier contribution years. The buy-back is only available for years in which you did not pay in the full annual maximum — typical after a job change, a university phase, a longer career break or years of part-time work.
Anyone who is allowed to contribute to a Pillar 3a account in Switzerland is, in principle, also allowed to make a buyback — the only difference lies in the annual ceilings and in the foundation's own regulations:
- Employees with a pension fund (BVG-obligatory). You may buy back up to half of the annual maximum per year — so roughly CHF 3,629 (status 2026). Most Pillar 3a foundations accept the buyback without ceremony, provided your Vorsorgeausweis (pension certificate) does not show a WEF advance withdrawal in the last three years.
- Employees without a pension fund. You may buy back up to the full annual maximum — CHF 7,258 in 2026 — provided that you paid in less (or nothing) in earlier years. Practically relevant: if you don't yet have a Pillar 3a foundation, you can open a new account and make the buyback simultaneously.
- Self-employed persons. Without an occupational pension (Pillar 2), you may buy back the difference between the annual maximum and the contributions you have already paid in — pro-rata in the year you entered the Swiss workforce (your BVG entry year is the cut-off date).
- Recent expats entering the Swiss labour market. If you only arrived in Switzerland a few years ago, your "eligible contribution years" start at your BVG entry. Until then, the pro-rata rule applies — you cannot buy back the years before you were BVG-obligated.
- Foundation acceptance. VIAC, finpension, Frankly, Selma and most bank foundations accept buybacks directly online. The bank or fintech usually asks for short proof (last year's tax return, gross income, BVG status) and then transfers the buyback onto the existing account.
VIAC and finpension accept buybacks generally right after account opening — even without prior years of contributions. Frankly requires a minimum contribution history of one year before the first buyback. Insurance-based foundations (Liberty, classic insurers) are stricter and usually require a written buyback application plus your latest Vorsorgeausweis.
How is the buy-back maximum calculated?
On paper, the formula for the buy-back maximum is simple — in practice it gets complicated by the question of which contribution years count as "already paid in" and which income is the relevant figure for the calculation.
The standard formula reads:
Concretely: someone who started working at 25 and is now 35 has 10 eligible contribution years. If they paid in during 7 of them (3 years of part-time work or job-change gaps), they can top up to 3 × CHF 7,258 = CHF 21,774 — either in a single year or distributed across several.
The following indicative table shows the buy-back potential for employees without a 2nd pillar who paid in only half the eligible years:
| Current age | Eligible years since BVG entry | Years already paid in | Buy-back potential |
|---|---|---|---|
| 35 years | 10 years | 5 years | 5 × CHF 7,258 = CHF 36,290 |
| 45 years | 20 years | 15 years | 5 × CHF 7,258 = CHF 36,290 |
| 55 years | 30 years | 25 years | 5 × CHF 7,258 = CHF 36,290 |
The authoritative figure is, of course, the Vorsorgeausweis issued by your Pillar 3a foundation. That is the official confirmation you need for the Swiss tax authorities (ESTV) when filing your tax return — and the document you also present to the bank or fintech when transferring the buyback.
Buy-back overlay with the tax-staggering planner
Anyone who plans a Pillar 3a buyback as part of a broader pension optimisation should not look at the buyback in isolation — it is one of three layers in a typical three-stage pension plan. The order that usually makes sense:
- Check the pension-fund (Pillar 2) buyback potential first. Your pension fund's Vorsorgeausweis shows the maximum you can buy back. Pension-fund buybacks are often even more tax-efficient than Pillar 3a buybacks because they break the progression further down and permanently reduce the coordination deduction. Rule of thumb: pension-fund buyback first, provided your pension fund accepts buybacks.
- Always pay the full annual Pillar 3a contribution. Even if you are planning a buyback, you should pay in the annual Pillar 3a maximum each year — ideally distributed across multiple accounts (VIAC + finpension + optionally Liberty). This annual full deposit is the precondition for any later withdrawal staggering.
- Top up with a voluntary Pillar 3a buyback. After exhausting the pension-fund lever and the annual contribution, planning a Pillar 3a buyback makes sense when you paid in less than the maximum in earlier years. Spreading the buyback across several years is often smarter — a very large one-off sum triggers the 3-year WEF lock-out immediately.
Pension-fund buyback → Pillar 3a annual full deposit → Pillar 3a voluntary buyback. If your cantonal tax administration treats very large combined contributions (Pillar 2 + Pillar 3a) as "implausible", a special review can follow — a short call to the tax office or a specialist saves a discussion later.
Buy-back plan example: 5-year overlay
| Year | Pillar 2 buyback | Pillar 3a full deposit (VIAC / finpension) | Pillar 3a buyback | Total deduction |
|---|---|---|---|---|
| Year 1 | CHF 30,000 | CHF 3,629 (50%) | — | CHF 33,629 |
| Year 2 | — | CHF 3,629 | CHF 7,258 | CHF 10,887 |
| Year 3 | — | CHF 3,629 | CHF 7,258 | CHF 10,887 |
| Year 4 | — | CHF 3,629 | CHF 7,258 | CHF 10,887 |
| Year 5 | — | CHF 3,629 | — | CHF 3,629 |
| 5-year total | CHF 30,000 | CHF 18,145 | CHF 21,774 | CHF 69,919 |
At a marginal tax rate of 28% this produces a cumulative tax saving of roughly CHF 19,577 over the five years — without counting the ongoing return on the topped-up retirement capital. The pension-fund buyback happens in year 1, the Pillar 3a buybacks are spread across the next three years.
Tax mechanics: how much does a buyback actually save?
The tax saving from a Pillar 3a buyback follows the same logic as a regular annual contribution: the deposited amount is deducted from taxable income, and the saving equals the buyback amount × your personal marginal tax rate.
Compared with the regular annual full deposit, a one-off buyback is equivalent in tax terms — the saving per franc is identical. The difference lies in the timing: choose the buyback year strategically and you typically move the saving into a higher bracket (when income is high that year). Choose a low-income year and the saving per franc is lower — but you may avoid the 3-year lock-out at the same time.
Important: Art. 79b BVG prohibits WEF advance withdrawals for 3 years after every buyback on that exact Pillar 3a account. Anyone who plans a WEF advance withdrawal in the same year as a buyback triggers a full repayment of the tax saving. Consequence: only make a large buyback when no WEF advance withdrawal is planned in the next 3 years.
Common pitfalls and lock-outs at the buyback
Buybacks into a Pillar 3a account are one of the biggest tax levers you have — but only if you know the lock-outs and the typical pitfalls. The seven points below cost thousands of francs every year in unnecessary tax or missed saving opportunities:
- Art. 79b BVG 3-year lock-out. Anyone who makes a buyback and then takes a WEF advance withdrawal from the same Pillar 3a account within 3 years triggers a full reimbursement of the tax saving — the tax becomes due again. Consequence: never plan a large buyback and a WEF advance withdrawal from the same account in the same year or close together.
- 5-year WEF lock-out on the same account. Anyone who already made a WEF advance withdrawal cannot pay anything into that exact account for 5 years — neither the annual contribution nor a buyback. That blocks the annual saving lever on the affected account. Fix: open a second Pillar 3a account (at a different foundation) and continue paying in and topping up there.
- Waiting periods when switching foundation. Anyone switching from an old insurance or bank foundation to VIAC / finpension / Frankly often has to wait 6–12 months before the first buyback is accepted. The new foundation wants to see a contribution history first before approving buybacks.
- Missing written buyback confirmation. The Swiss tax authorities (ESTV) require an official written buyback confirmation from the foundation for the tax return. Anyone who deducts a buyback in the tax return without the confirmation risks a tax assessment correction. VIAC, finpension and Frankly deliver this automatically.
- Buyback after a WEF withdrawal without waiting 3 years. Anyone who made a WEF advance withdrawal last year and then makes a buyback the following year triggers the repayment rule. Fix: wait 3 years — or do the buyback on a different Pillar 3a account.
- Pro-rata calculation on entry to the Swiss workforce. Anyone who only recently entered the Swiss labour market (for example as a recent expat) can buy back only pro-rata — not the full amount. The cut-off date is your personal BVG entry year.
- Single very large buybacks in one year. Putting CHF 50,000 into the Pillar 3a as a single buyback creates a 3-year WEF lock-out. For middle-income earners that is often too ambitious. Smaller and staggered = better.
Pillar 3a buy-back checklist: 10 points for your buyback
The ten points below cover the typical buyback planning. Use them as a template for your own November tax planning — or have the print-ready version sent straight to you by email (see form below).
- Check the foundation's Vorsorgeausweis — it shows your concrete buy-back potential ("Vorfinanzierungs- oder Einkaufsmöglichkeit").
- Ask the foundation for a written buy-back confirmation — you need the official confirmation in the tax year.
- Check the pension-fund (Pillar 2) buyback first — usually the higher tax saving per franc.
- WEF advance withdrawal planned in the next 3 years? If yes, skip a buyback in the year before (Art. 79b BVG).
- Stagger the buyback across years — no more than one annual-equivalent per year, never everything at once.
- Run multiple Pillar 3a accounts in parallel — buy back on the account without a WEF lock-out, and keep paying the annual maximum on the others.
- Check your BVG entry age and eligible contribution years — the maximum is calculated from your BVG entry, not from your first job.
- Account for the foundation waiting period — new fintech foundations want 6–12 months of contributions before the first buyback.
- Declare the buyback in next year's tax return — under "Vorsorgeaufwand" together with the foundation's written confirmation.
- Set your buyback plan every November for the following year — don't decide spontaneously in December.