Is this on steam or itch.io? Anything about steam taxes is to be held responsable by you, you got to correctly do it. If you want to only sell in brazil you need to use steam region lock features that will make customers unable to buy your game anywhere but brazil (yes the other regions like mexico, peru, chile, etc will not be able to buy your game).

If this is itch.io you need to fill out paperwork to not get tax withholdings. I am assuming you didn't do this and might need to contact support to redo it.

Edit 2023: This post is outdated. We only apply withholding to US source based income, this has been the case for multiple years now.

This mean that this withholding tax should apply only for sales to U.S.A. customers right?

We've seen this part of Steam's terms. We've consulted with multiple accountants and lawyers about this for our company and they advised that since we are a United States company we have to apply the withholding rate to all income send to you from our bank account.

I don't know what Steam's arrangement is, they may have other entities in other countries to work around this, or they may have interpreted the tax law differently.

Ok i know what happen, Brazil will not go to an agreement with USA to make a tax treaty. You have to take the 30%.