Yes, taxable Social Security would be included in your MAGI on line 13 of Form 8960. According to Topic no. 559, Net Investment Income Tax "Modified adjusted gross income (MAGI), for purposes of the NIIT, is generally defined as adjusted gross income (AGI) for regular income tax purposes increased by the foreign earned income exclusion (but also adjusted for certain deductions related to the foreign earned income). For individual taxpayers who haven't excluded any foreign earned income, their MAGI is generally the same as their regular AGI."
This means that not all of your social security is included, only the amount that is on line 6b of your 1040 form. There is not a special exclusion for the taxable portion of your social security benefits.
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