If you had an AMT, it would show on schedule 2, part I, line 1 of form 1040. Can you verify that you don't have an AMT by looking on that schedule, as follows:
1. Find the "Tax Tools" option on your left menu bar and click on it
2. Click on "Tools"
3. Click on "View Tax Summary"
4. On your left menu bar find the "Preview my 1040" option and click on it
Even you don't have an AMT, your credit can be denied if your tentative minimum tax is more that your net regular tax, as mentioned in the previous post. Your income tax as listed on line 12(a) may include additional taxes listed on schedule 2. So, you may have to take a close look at schedule 2 to determine what your net regular tax is.
If you don't have a net federal tax, that would result in your credit being denied for the current year, so you need to check that as well.
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