Get your taxes done using TurboTax

I've been doing some testing.  I added income in the form of long-term dividends.  I added $10,000 of dividends and there was no impact.  I added $17,500 (which brought my AGI to approx. $16,000) and my tax credit appeared.  So there seems to be some type of minimum income requirement in order to get the Healthcare Premium Tax Credit.  I don't understand why that would be the case, but it resolves my issue.  Thanks.