The balance due would be from a payback of an overpaid credit received during the year. The 1095-A form helps report coverage of any advanced tax credit payments received. The payments received is based on what you estimated as your income for the year. The premium tax credit is calculated based on your actual income during the year. If your income exceeds the estimated amount given when you sign up for your Marketplace plan you will be required to pay back the overage received for the credit.
For more information on the 1095-A form, see the links below:
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