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Sorry, Turbo Tax is doing it right. This is a common misunderstanding. If you are both over 65 and in the phaseout amount, the 6% reduction is subtracted from EACH spouse's 6,000 effectively making it 12%.

Line 35 is only 6,000 . Read the line, it says....subtract line 34 from $6,000 $6,000 is the max for line 35. Because the reduction is calculated on each person's 6,000, even on a Joint return, when both spouse's are over 65.

It is phased out for EACH spouse. Fill out Sch 1-A yourself and see. It's pretty easy. Then why would they even have 2 lines 36a and 36b for spouse on Schedule 1-A?

IRS Schedule 1-A
https://www.irs.gov/pub/irs-pdf/f1040s1a.pdf

Here is the official IRS Schedule 1-A

See IRS instructions for 1040 Schedule 1-A on page 110
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf

Here's a chart I made.........