I've never had any issues invoicing people from all over the world with a dzialnosc gospodarcza. I even used to include both zloty and Euro amounts on the invoices, no questions asked.
Mr D how many times do I have to tell you that if you have paid tax in GB and transfer money you cannot be taxed again, stop this nonsense about telling people to tell the polish tax authorities about money transfers....If the money was earned in Poland he would have to inform the tax authorities in the usial form....pls stop giving wrong information to people...
What are you talking about? Poland has incredibly simple tax residency laws - if you're resident here for more than 185 days, you're considered a Polish resident for taxation purposes and must make the appropriate declarations.
Why so serious?
Why would you tell the Polish tax man? Because you're committing tax fraud in Poland as it stands - you're legally resident here for tax purposes and must pay your fair share of taxation to the Polish government. It's almost a certainty that you'll have a liability for some Polish taxes due to the UK allowing what, 7,000 pounds tax free - whereas Poland only allows a base of around 3000zl. So - go there, own up and pay what's owed.
HE DONT NEED TO,if he is working for a UK firm who sent him for some time to work for them in poland,until he declares he is a resident of poland and is an representative of the company in poland.
Wrong. If you're resident for more than 185 days, you pay taxes to Poland. End of story.
If you are paying taxes in the UK, you most probably won't have to pay taxes in Poland but you need to tell the tax office that you are paying those taxes and you need to prove that the taxes are paid.
From a quick check of the tax calculators, he'll definitely have some liability in Poland. Actually, could be more than "some" - could easily be in the region of 25,000zl a year (the difference between the UK and Polish tax free amounts).