Finding your financial office can be complicated, although in Prague you should go to the office for the district where you live, e.g. Prague 4. Note that that the districts Prague 11-20 all come under one of the 10 municipal districts, so if for example you live in Prague 18 – Letňany, which is located in Prague 9, you should go to the financial office for Prague 9. Outside of Prague establishing where to go can be more complicated, but the website mentioned below should help.