I checked the box the I had marketplace insurance when in fact I did not. How do I correct this before I finish filing?
In the Search box type "1095-a" (without the quotes), then click the link that says "Jump to 1095-a." That will take you back to the screen that asks whether you received a 1095-A, and you can answer No.
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.