What is AHV and how does it calculate your pension?
AHV stands for Alters- und Hinterlassenenversicherung. Switzerland's state old-age and survivors' insurance, equivalent to a national social security system. It's funded by mandatory contributions from every working person in Switzerland (and their employer), calculated as a percentage of salary.
Your eventual AHV pension is calculated based on two factors: how many contribution years you've accumulated, and your average annual income across those years. The maximum full AHV pension in 2026 is CHF 2,450 per month for a single person. To receive the maximum, you need 44 contribution years (for men) or 43 (for women, though pension reform is equalising this).
Every missing year reduces your pension by approximately 1/44th of the maximum, about CHF 55–60 per month, permanently, for every year of gap.
Why immigrants almost always have a gap
AHV contribution years start from age 21 in Switzerland (age 18 for people who aren't in education). If you arrived in Switzerland at age 30, you have a minimum 9-year gap, simply because you weren't here and contributing. If you arrived at 35, it's a 14-year gap.
This isn't anyone's fault. It's structural. The Swiss pension system was designed around people who spend their entire working life in Switzerland. Immigrants didn't grow up inside that assumption.
The practical impact: an immigrant arriving at age 35 who retires at 65 will have a maximum of 30 AHV contribution years, which means they'll receive approximately 30/44 of the maximum AHV pension, roughly CHF 1,670 per month instead of CHF 2,450. That's CHF 780 less per month in retirement, or CHF 9,360 per year, for life.
The gap doesn't compound like investment returns, but its effect is just as permanent. A gap left unfilled when you arrive stays unfilled for the rest of your Swiss working life, and directly reduces your monthly income in retirement.
How to find out what your gap actually is
The AHV/AVS compensation office maintains a record of your contributions. You can request an individual account statement (Kontoauszug / Extrait de compte individuel) by writing to your cantonal AHV compensation office or through the central AHV compensation office in Geneva.
The statement shows every year contributions were made and the income base they were calculated on. The gap years, years before your Swiss contributions began, will simply be absent from the record.
Once you have the statement, you can calculate: 44 (full entitlement years for men) minus your total contribution years gives you your gap. A simpler heuristic: every year you lived outside Switzerland between age 21 and 65 is likely a gap year.
Can you voluntarily fill AHV gaps?
The answer is: sometimes, and only in specific windows. Switzerland allows voluntary AHV contributions in limited circumstances:
- While living in Switzerland: If you're a non-working spouse of a working person, or you have periods of reduced income, you may be eligible to make voluntary contributions for certain gap periods.
- Social security agreements: Switzerland has bilateral social security agreements with many countries. Years you worked and contributed to pension systems in those countries may be taken into account when calculating your Swiss AHV pension, not filling the gap directly, but potentially affecting how Swiss authorities calculate your entitlement.
- The five-year retroactive window: Some cantonal offices allow retroactive voluntary contributions for up to five years before the request. The window and rules vary.
The honest answer is that filling AHV gaps is legally complex and not always possible. What's almost always possible and financially important is understanding how large your gap is, what it means for your expected pension, and how to compensate for it in your broader retirement plan.
How to compensate for AHV gaps
If your AHV gap is significant and largely unfillable, the compensation strategy shifts to the voluntary pillars, specifically Pillar 3a and Pillar 2 buy-in contributions.
- Maximise Pillar 3a every year: CHF 7,056 per year, consistently contributed, invested in equities, compounding over 20–30 years, will generate a significant supplementary retirement income that partially offsets the reduced AHV pension.
- Check Pillar 2 buy-in capacity: Many people don't realise their occupational pension (Pillar 2) has a buy-in capacity, an amount you can voluntarily contribute above your mandatory contributions to fill gaps in your pension fund. These contributions are also fully deductible for income tax purposes. Buy-in capacity is often very large for immigrants who arrive mid-career.
- Factor it into your savings rate: A reduced AHV pension is a known shortfall. Build the calculation into your retirement planning, how much additional private savings do you need to compensate for each CHF 500/month gap in state pension income?
The three things to do this month
- Request your AHV account statement from your cantonal compensation office, it's free and typically arrives within a few weeks.
- Count your gap years (years between age 21 and your Swiss arrival date) and multiply by CHF 55 to get your approximate monthly pension reduction.
- Check your Pillar 2 buy-in capacity, your pension fund administrator can tell you this. If the capacity is large and you have spare capital, a buy-in may be one of the best tax-advantaged moves available to you.