When filing your taxes, you should have entered Form 1095-A which you received from your marketplace insurer. This info is used to add Form 8962 to your tax submission. The form reports the amount of PTC you are allowed. If you took zero throughout the year, i.e., paid the entire insurance premium out of pocket, then the form will show the full credit amount due to you as a refund above any refund based on income alone. So, you should have a $1200 or so income tax refund PLUS the $7200 PTC credit.
