@lilygoat1958 VolvoGirl is correct, if it is income on the tax return, it is income for purposes of the Premium Tax Credit (the credit is based on your Modified AGI). As-is, it looks like your "client" will need to repay the entire Advance credit.
However, if your client is married, filing as Married Filing Separately may reduce the repayment. In the event they had any self employment income, contributing to a SEP to get under 400% will also reduce it.
As a side note, you mentioned your "client". I hope you are not using TurboTax as a paid tax preparer, as it is not licensed for that. If you want/need more information about that, please post back.
