Answer:
House of Representatives.
Step-by-step explanation:
In the Congress of the United States, it is a rule that all legislation related to taxes, expenses by citizens or measures of a similar nature be dealt with originally in the House of Representatives.
This is so because it is understood that the House is the chamber that directly represents the people of each state, while the Senate represents each state itself. Thus, based on the principle of "No taxation without representation", it is understood that citizens are represented in the House and, therefore, there should begin to discuss tax issues.