Social security number in Switzerland (AHV/OASI)

A  social security number is a crucial piece of paperwork in Switzerland. The number is given to every resident once their application for a residence permit, health insurance and registration is completed. It is issued by the social security services in order to streamline the application process for benefits and to prove how long you have paid into the Swiss social security system.

What is a social security number in Switzerland?

Your social security number in Switzerland is a number unique to you that allows you to access social security programmes. It is also used to calculate how long you have been contributing to your pension.

It is also known as an:

• AHV number
• OASI number

The OASI number is 13 characters long and begins with the number 756, followed by 10 other random numbers. Each OASI number is unique and anonymous, revealing no personal information about the holder. Your OASI number is valid for life and does not change even if your personal information changes. Even small children receive an OASI number as soon as they are registered with a health insurer. 

Purpose of an AHV number

With your AHV number, social services are able to find out economic information about you, such as your employment status, so that they can determine whether you are eligible for unemployment benefits or welfare. You will also need to provide this number to:

• Confirm to an employer that you have health insurance.
• Claim your mandatory first pillar pension.
• Switch basic health insurance.
• Switch supplemental health insurance.

How to get a Swiss social security number

As part of the process of getting a residence permit in Switzerland, you are required to take out health insurance. Once your application for health insurance is complete, you will be provided with your social security number, along with your health insurance policy. Your AHV number will remain the same throughout your residency in Switzerland, even if you switch health insurance policies.

If you receive your health insurance through your employer and want to know your number before you receive your health insurance card, contact your employer and they will be able to provide it.

If you are self-employed, you can ask your social insurance office. If you are studying in Switzerland, your educational institution should be able to provide your social security number. 

Where can I find my AHV number?

Your AHV number will be on the card given to you by your healthcare provider. The number is usually 13 characters long and can be found on any healthcare document or on your health insurance policy.

Alternatively, if you are not sure, your employer or social insurance agency should also be able to let you know what your social security number is. 

How do I replace a lost AHV number card?

If you have lost your health insurance card, it is essential that you apply for a new one, as it is the way you access emergency services and healthcare. Insurance providers will be able to provide a new AHV number card at no extra cost, only asking you to pay for postage. If your card has been stolen, you must inform your provider, who will give you new details.

OASI number once you have left Switzerland

Your OASI number can still be useful after you leave Switzerland. If you continue paying into a first or second-pillar Swiss pension after you move away, you will need your OASI number to access your pension benefits once you retire. If you carry on receiving social security benefits after leaving Switzerland, you also need to have your OASI number in order to access these funds.

If you cannot remember your OASI number and you need it while living abroad, you can fill out this form to request a duplicate.