What happened to the flat tax?

The flat tax, a system where a single tax rate is applied to all income levels, gained popularity in the 1990s and early 2000s, particularly among conservative politicians and economists advocating for simplicity and fairness in the tax code. However, it faced significant opposition due to concerns that it disproportionately benefits higher earners and could lead to reduced government revenue. While some countries have implemented flat tax systems, in the U.S., the idea has largely fallen out of favor, with ongoing debates about tax reform focusing more on progressive taxation and addressing income inequality. As of now, no major flat tax proposals have gained traction in U.S. federal policy discussions.