See IRS Form 1040 instructions page 43 for the worksheet to calculate tax if foreign earned income exclusion is claimed - https://www.irs.gov/pub/irs-pdf/i1040gi.pdf#page=43
Foreign Earned Income Tax Worksheet.
If you claimed the foreign earned
income exclusion, housing exclusion, or
housing deduction on Form 2555 or
2555-EZ, you must figure your tax using
the Foreign Earned Income Tax Worksheet
The TurboTax program calculates your tax based on the IRS Foreign Earned Income Tax Worksheet—Line 44
