Tax glossary
Pension fund buy-in (Pensionskasseneinkauf)
A pension fund buy-in is a voluntary payment into your occupational pension (pillar 2) to close contribution gaps — the full amount is deductible from your taxable income.
Your pension fund calculates how much retirement capital you would have today if you had been insured on your current salary with full benefits since the start of your insurance period. The difference to your actual balance is your buy-in potential. Gaps arise from salary increases, part-time work, years abroad, further education or a divorce — which is why many expats who moved to Switzerland mid-career have a large potential.
Buy-ins are fully deductible for both cantonal and municipal tax and direct federal tax. Unlike pillar 3a, there is no fixed annual maximum: the only limit is your buy-in potential under the fund's regulations, shown on your annual pension certificate (Vorsorgeausweis) or available on request from your fund.
The catch: after a buy-in, benefits resulting from it may not be withdrawn as a lump sum for three years. Otherwise, the tax deduction is retrospectively refused. The lock also applies to early withdrawals for home ownership and — according to case law and Zurich practice — generally to any lump-sum withdrawal from the pension fund, regardless of which part of the capital it comes from.
Conditions and limits
Not every buy-in is possible without restrictions. Before you pay in, check the following points.
- Buy-in potential according to your current pension certificate or a written confirmation from the fund
- For the self-employed, pillar 3a assets above a statutory reference value can reduce the potential
- Early withdrawals for home ownership usually have to be repaid before a buy-in is possible
- Moving from abroad: in the first five years, annual buy-ins are capped at 20 percent of the insured salary
- Vested benefits (Freizügigkeit) not transferred into the fund are counted against the potential
The three-year rule
The three-year lock is the most common pitfall. If you buy in at 62 and take your retirement capital as a lump sum at 64, you lose the tax deduction for the buy-in after the fact — the tax office corrects the final assessment through back-tax proceedings.
- Make your last buy-in at least three years before a planned lump-sum withdrawal
- The lock also applies to early withdrawals for home ownership
- If you take a pension instead of a lump sum, the lock does not affect you
Spreading buy-ins over several years
Because Swiss income tax is progressive, one large buy-in in a single year saves less than several medium-sized buy-ins spread over a few years. Each franc is deducted at your marginal rate, and that rate falls as more income is removed. Planning five to ten years ahead of retirement is often ideal.
Example: staggered buy-ins before retirement
An engineer in Winterthur, aged 55, married, with a taxable income of CHF 150,000, has a buy-in potential of CHF 120,000 according to his pension certificate. He plans to take part of his capital as a lump sum at 65.
Rather than paying in CHF 120,000 at once, he buys in CHF 30,000 a year over four years. At a marginal rate of around 30 percent, he saves about CHF 9,000 in tax each year, roughly CHF 36,000 in total. His last buy-in is at 59 — well over three years before the lump-sum withdrawal. A single buy-in of CHF 120,000 would have pushed his income down into lower tax brackets in one year, and the saving would have been smaller.
Frequently asked questions: Pension fund buy-in (Pensionskasseneinkauf)
Where do I find my buy-in potential?
On your annual pension certificate, usually labelled "maximum possible buy-in". Ask for an up-to-date written confirmation before buying in, as the potential changes with every salary adjustment.
When do I need to pay for the deduction to count this year?
What counts is the date the payment is credited by the fund. Many funds require payment by mid-December, so transfer early.
Is a buy-in worthwhile if I plan to take a pension?
Yes. The three-year rule only applies to lump sums. If you take a pension, you can buy in until shortly before retirement — though the pension itself will later be fully taxable as income.
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