The problem with lying is that the IRS will catch the lie during the year's filing season and will deduct the money from any return. This has been a problem with how the whole operation is to work. They will use your previous year's tax returns to determine the amount of the subsidy. If during the year your income changes (increases) then you will how the IRS the difference in the two levels of subsidies. If you no longer qualify for a subsidy then they will take the full amount from your return. If the full amount exceeds your return you will owe. If your income goes down however, the subsidy will not increase retroactively.
Sucks huh...