Saving taxes or building capital – a pension fund buy-in (PK buy-in) can do both. But it’s not always the best choice.
This article explains when a buy-in truly pays off, when it doesn’t, and why opportunity costs are often overlooked. FIN helps you find the right strategy and the best timing for your pension fund contribution.
Pension Fund Basics: What Is a Pension Fund (PK) Buy-In?
A pension fund buy-in is a voluntary contribution into Switzerland’s 2nd pillar (occupational pension system). It helps you close pension gaps that may have arisen through:
- part-time work
- time abroad
- divorce
- career changes or other employment interruptions. It increases your future retirement assets while reducing your taxable income – similar to contributions to the Pillar 3a system.
What Is the Goal of a PK Buy-In?
Most people buy in to reduce their taxes or invest surplus liquidity. But be cautious: a buy-in only makes sense if you also have an exit strategy – meaning you know how and when you’ll withdraw the funds. Without one, you may end up repaying the saved taxes later through higher taxable pension payments.
How Much Should a PK Buy-In Be?
Your contribution should be large enough to reduce your income progression noticeably. The optimal amount depends on your income level and place of residence. With the FIN tax calculator or a personalised consultation, you can determine the buy-in amount that makes sense financially and fiscally.
When Does a PK Buy-In Not Make Sense?
A buy-in is not advisable if, in the same year, you:
- have major property maintenance or renovation costs,
- plan to use pension funds for home ownership (WEF withdrawal), or
- will need the capital in the short term. In such cases, other tax-efficient investments – such as energy upgrades or future-year pension contributions – often make more sense.
Where Can You Find Your Buy-In Limit?
Your personal buy-in potential is listed on your annual pension statement, usually on page 2 under “Einkaufspotential” (buy-in amount). The limit can change with:
- salary increases
- changes in employment percentage
- length of service
- or updates to your company’s pension plan
Why Do Buy-In Limits Change?
Your buy-in potential is based on your insured salary and years of contribution. As your income rises, so does your buy-in room. Legal changes, coordination deductions, or minimum contribution adjustments also affect the limits, ensuring the system remains flexible and reflects your career path.
When Is a PK Buy-In Worthwhile?
A buy-in is most beneficial:
- in the years before retirement,
- when no WEF (home ownership) withdrawals are planned, and
- if you can observe the three-year and one-day holding period before withdrawal.
Always define your purpose first: Do you want to save taxes, increase your pension, or secure a partner financially?
How Much Tax Can You Save?
Your savings depend on income, buy-in amount, and canton.
Example:
Taxable income: CHF 140,000
Buy-in amount: CHF 40,000
→ Potential tax savings: several thousand francs, depending on canton and marital status.
Example Marginal Tax Rates
| Location | Married | Single |
|---|---|---|
| Zurich | ~28% | ~30% |
| Basel | ~30% | ~30% |
| Zug | ~17.5% | ~21% |
| Wollerau | ~16% | ~16% |
| Lucerne | ~27% | ~26% |
| Frauenfeld (TG) | ~31.5% | ~31.5% |
| Aarau | ~28% | ~30% |
| St. Gallen | ~31.5% | ~31.5% |
The higher your marginal tax rate, the greater the potential savings.
The Opportunity Costs of a PK Buy-In
Pension fund returns are often modest, especially in the extra-mandatory portion where many buy-ins are allocated. While diversified equity strategies can yield 5–8% per year, pension funds often generate only 1–2% interest. Over time, that difference compounds – despite short-term tax benefits.
Comparison: PK Buy-In vs. ETF Strategy
| PK Buy-In | ETF Strategy | |
|---|---|---|
| Contribution | CHF 30,000 | CHF 30,000 |
| Tax savings | CHF 10,000 | – |
| Total invested | CHF 40,000 | CHF 30,000 |
| Average return | 2% | 5% |
| Investment period | 20 years | 20 years |
| Final capital | ~CHF 60,000 | ~CHF 80,000 |
The ETF strategy yields a higher long-term result – even without a tax benefit – thanks to the power of compound interest.
When Does a PK Buy-In Still Make Sense?
A buy-in can still be worthwhile:
- when paid into a 1e pension plan (allowing higher equity exposure),
- a few years before retirement,
- to increase pension entitlements, or
- for highly risk-averse individuals.
The key is to weigh opportunity costs against your overall financial goals and time horizon.
Conclusion: Strategy Over Impulse
A pension fund buy-in isn’t a one-size-fits-all solution. It can lower taxes and strengthen your retirement savings – but only when the timing, amount, and objective fit your broader financial plan. With FIN, you’ll understand when a buy-in truly adds value – and when alternative approaches such as equity investments or 1e plans can deliver better long-term results.
FIN – Pension planning with foresight: save taxes, seize opportunities, achieve goals.
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