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| I didn't. All the local tax office wanted was a couple of invoices and/or quotations - which is what they got and were happy with too... | |
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The rules and criteria for classification as self-employed are here:
http://www.svazurich.ch/index/index.cfm?page=akb_selb
The keyword is "mehrere" meaning several clients. It is entirely at the discretion of the AHV office, who look at all the facts and then decide.