Last year, the IRS corrected line 6b on my TurboTax Return to show $0 Social Security taxable amount. The only thing I can figure is that the calculation in TurboTax includes both my Social Security Benefit and my spouses, X .5 + other income. That resulted in a Social Security taxable amount. Which the IRS corrected.
However, if I calculate it on an individual basis, as it dictates on Notice 703 (on the back of Form SSA-1099 Social Security Benefit Statement), neither I nor my spouse owe taxes.
It seems to me that Turbo Tax may need to be tweaked. I'm not the expert here but there is definitely a difference between the IRS and TurboTax are calculating it.
