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The calculation for 8962 is generally AGI + foreign income exclusion + tax-exempt interest + non-taxable Social Security. If you have an amount on 5a and 5b of your Form 1040, Form 8962 may be adding the difference between these amounts to your MAGI on Form 8962.
The best way to check if you're using TurboTax Desktop is to go to FORMS mode, Open Form 8962, and right-click on Line 2. Choose 'data source' and a window pops up telling you the documents used to calculate the number.
