When you signed up to get health insurance from the marketplace ---you estimated and told the marketplace how much income you expected to receive in 2023. The amount of the premium that the marketplace paid was based on what you told them. The marketplace paid some of your premium and you paid a monthly amount too. If you ended up making more money than you estimated, then you have to pay back some of the money the marketplace paid for your insurance. If your job or circumstances changed during 2023, you were supposed to tell them and have the amount of your premium adjusted. If you did not do that, then you now owe some money back, and it is paid back by owing on your tax return.
(And......if it had been the other way around, and you had even less income than you expected to earn, you would get some of the money you paid for the premiums back as a tax refund.)
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**