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UK Resident exploring freelance work for a Swiss Company
If the firm treats you as an employee then they are treated as having a place of business in the UK and therefore are obliged to operate PAYE on your behalf - this rule has applied to EU States since 2010 and the non-EU EEA members, including Switzerland, since 2012. If you are not an employee then your main options are: An umbrella company would basically bill the client on your behalf and pay you net of taxes and NI.  You potentially take home a bit less than you would being 100% independent but it's a lot less hassle and potentially makes sense for a small contract.