I would like to know about VAT.
If I make payment for freelancers who conducted service located in Poland where Im living now, should I pay VAT ?
Same as if I sell my service to other person in Poland should I put VAT ?
or If I sell my service outside Poland should I add VAT as freelancer or should I buy with VAT ?
or without VAT ?
How about TAX ?
will you provide tax declaration or should I provide tax declaration by myself when I received payment ?
Or I dont have to declare it to the tax office ?
Upwork doesn't currently charge VAT on client payments to freelancers or on payment processing fees. Clients in the EU may enter a VAT number in Settings > My Info so that invoices from the freelancer can be marked 'VAT Reverse Charged' when appropriate. This will appear on your invoices if the freelancer or agency is located in a different country. You can check out this help article for more information on VAT.
Regarding taxes, please consult with a local tax advisor as we can't provide tax advice. Feel free to check out this help article for more information on the taxes and this one for reports and invoices.