Some 22 million Americans are set to lose health insurance subsidies by the end of the year. These subsidies, known as enhanced premium tax credits, lower costs for people who buy their health insurance through Affordable Care Act (ACA) marketplaces (sometimes called Obamacare). They are at the heart of a weeks-long standoff that has shuttered the federal government since Oct. 1st. About 80 percent of the people who benefit from them live in states that Donald Trump won in the 2024 presidential election. Many have no idea that their health insurance costs are on track to go up.