If you received an Advance Premium Tax Credit during 2018, it was because when you signed up for health insurance from the Marketplace you showed that you anticipated income for 2018 that would be lower than 400% of the Federal Poverty Level. You were treated as eligible for a subsidy. If when you file your return it shows that your income was over 400% of the Federal Poverty Level, you'll have to pay back all of the subsidy. The amount that you paid for insurance is not in question. But the subsidy amount will have to be repaid if your income for the year was too high. This can certainly add up to $10,000 if your advance premium credit was around $850/month.
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