when the Marketplace asks about household income it is asking about what will appear on line 3 of form 8962.
this is basically you Adjusted Gross Income which is negative. So if it's substantially misreported you are filing a false application.
have you read the instructions for 8962 lines 2a and 2b the total of which is Household Income. worksheets are in the instructions
https://www.irs.gov/pub/irs-pdf/i8962.pdf
