@jorgeortioneto I am not sure I understand the whole scenario . What I get is
(a) you, an NRA, with a foreign tax home ( which country ?)
(b) you act as a sales rep for a US entity, securing orders of its products, filled by the entity directly ( are the customers US based or in your tax home country? )
(c) You invoice the US entity for the commission and the entity transfers funds to your local bank
(d) You pay 30% tax on your commission ( to the US? ).
Do you also pay to your tax-home country ?
Do you file a US tax return also ?
What I am not clear about is why do you pay US taxes -- you are not a US person ( Citizen/GreenCard ) -- and the work is being performed at a foreign location. Why do you consider this earning as US sourced ?
I will circle back once I hear from you --yes ?
