The Corporation Tax of 1909 originated in the House as a tariff bill; the Senate stripped and replaced its contents with a tax on corporate income before returning it. Challengers argued the tax violated Article I, § 7's rule that bills for raising revenue must originate in the House. The Court held that the House had originated a revenue bill; the Senate's power to 'propose or concur with Amendments' includes wholesale substitutes so long as the subject remains revenue. Flint is the foundational precedent letting the Senate rewrite House-passed revenue bills — a practice used continuously ever since, including in the Affordable Care Act's passage.