Is it possible to see precisely how Form 1040a Line 28 ("Tax") is calculated? The amount supplied by TurboTax does not match the 2017 tax table.

[TaxGuyBill]

Do you have Long Term Capital Gains or Qualified Dividends?  If so, there should be a worksheet for that (you may need to look at the "all" worksheets).

Does your tax return have Form 6251?

Or do you have Foreign Earned Income that was excluded?

[DawnC0 · Accepted solution]

The tax table you are looking at is for ordinary income only.  Some income is taxed at different rates (Qualified Dividends/Long-Term Capital Gains are taxed at a lower rate than ordinary income).  If you have any of the following included in your return, the tax table will not give you accurate results:  

• Qualified Dividends and Capital Gain Tax Worksheet
• Schedule D Tax Worksheet
• Schedule J
• Form 8615
• Foreign Earned Income Tax Worksheet