Hi!
What stock exchange should I choose so that I do not have to verify and can pay to my bank account without suspicion from the tax office?
I believe there were some dutch exchanges that offered to let you buy and sell bitcoin without verification, so long as you had an IBAN.
I think it was
https://bitonic.nl/en/ ?
They're pretty legit.
From their site:
Easy No need to submit documents or make international money transfers
* One time only bank account verification required
Not sure what their limits are though, above x amount they might still ask for KYC verification.