Certificate of marital status for single/unmarried

For pension and tax related issues I am required to prove that I am single and unmarried. As far as i know only swiss citizens can obtain a civil certificate from there Gemeinde stating they are single and only people who are married will have a marriage certificate. As a non Swiss it seems a bit convoluted to have to prove that one is unmarried. Most countries simply dont issue certificates for singles. Has anyone had any experience in dealing with this request?

I know some countries accept an affidavit stating the same with authentication from relevant authorities in country of origin.

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Never had to get such a document for tax purposes, but I’ve recently applied to become a Swiss citizen and for that I needed to get on the “Zivilstandregister”. For that I needed to get a Ledigkeitsbescheinigung from my home country. As Abs_max noted, an affidavit from you home country with an apostille may also be acceptable. The tax authorities should be able to tell you in more detail what they’ll accept.

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Just an update. The pension office informed me that they will be ok accepting a notarized affidavit which i can just do here, so no need to get one from my home country (unless its way cheaper)

In case it can help other people :

I had the same request when withdrawing my LPP for primary home purchase. I am French living in Vaud canton.

Providing my birth certificate from France was accepted, because apparently this certificate is supposed to be amended with a mention when you get married. So if the certificate is “virgin” from such mention, it is accepted as a proof that you are not married.

Both my girlfriend and I could order it on the website of our hometowns. It took a week to arrive in my case, 10 days for my GF.

Had to do this before, pledging of 2nd pillar.

What worked was providing them with a certificate of civil status both of place of birth and of the country I lived before moving to Switzerland.