Which department or branch of government is responsible for creating domestic policies concerning the collection of taxes?

The collection of taxes is a power delegated to the United States Congress (aka the Legislative branch). The members of the House of Representatives and the Senate work together in order to levy and collect any type of tax that is passed by law (such as import duties). This power is given to Congress in the US Constitution in Article 1 Section 8.

Congress. but i need to have at least twenty characters to post this so, here you go