If I use all my tax credits to lower my monthly premium costs, then do I still get money from tax returns for that year.
As long as you didn't take more Advanced Premium Tax Credits Payments then owed, and maintained coverage all year, ObamaCare cost assistance won't affect your tax refund. If you took less than you were owed, you'll get a bigger refund. If you took more than you were owed, or didn't have coverage (and didn't qualify for exemptions), then you may owe some back. Learn more about filing taxes under the ACA.