Final answer:
Revenue raising bills must originate in the House of Representatives, as mandated by Article I, Section 7 of the U.S. Constitution, but the Senate can propose amendments to these bills.
Step-by-step explanation:
Revenue raising bills can only begin in the House of Representatives, as specified by the United States Constitution. According to Article I, Section 7, "All Bills for raising Revenue shall originate in the House of Representatives; but the Senate may propose or concur with Amendments as on other Bills." This section establishes that while the House is responsible for originating tax and revenue legislation, the Senate retains the capability to propose amendments to these bills. It's also important to note that the Senate plays a crucial role in the process, as both the House and Senate must approve a bill before it goes to the president for a potential veto or enactment into law.