Is my tax set up right? freelancer with international clients

Hi,

I’m a freelancer taking on clients in new countries, and I’m looking for any advice on whether I’ve understood my situation correctly and where I could be looking for more information.

I’m a UK citizen, and I was a freelance editor in the UK for three years, before I moved to the Netherlands (before Brexit, with full rights to work and stay here). I’ve got a part time job in the Netherlands, and I still work remotely for a number of UK companies. I’ll also be working for a Swiss company starting soon. The Dutch advice is that this work counts as services supplied outside the EU, and therefore VAT has to be declared in the countries where the work is done, not where I’m based (ie, it has to be declared in Switzerland and in the UK). Does this essentially mean declaring tax as a non-resident in the UK and Switzerland, as well as filing as a resident in the Netherlands? How would I go about this, in the UK and Switzerland? I can find a lot of information about how to declare foreign or worldwide income in the country you're tax resident in, but not how to declare it in the country it's earned in.

Ideally I'd like to work with a financial advisor who could help me file correctly in each country - I'm aware this would most likely be someone based in the Netherlands, so this might not be the right place to look for this, but if there's any advice on how to find an advisor who can take care of these issues, and what sort of questions I should be asking/buzzwords I should be looking for, I'd be very grateful.

Thank you!