The Value Added Tax (VAT) https://polishtax.com/information/polish-tax-law/vat-law/

Personal Income Tax https://polishtax.com/information/polish-tax-law/income-taxes/pit/

Corporate Income Tax https://polishtax.com/information/polish-tax-law/income-taxes/cit/

Registration for taxes in Poland https://polishtax.com/information/polish-tax-law/tax-registration/