Once you enter your information from your 1095-A, TurboTax will use that info to automatically fill out Form 8962 and submit it to the IRS with your tax return. This is used to calculate your premium tax credit on your 2015 return. Any credit balance is added to your refund or reduces any tax amount owed.
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Where Do I Enter My Form 1095-A?
https://ttlc.intuit.com/replies/4268797
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If you already filed your return and received a letter from the IRS about your missing 8962 form, see the following:
What do I do if I received an IRS letter about a missing Form 8962 on my 2015 return?
https://ttlc.intuit.com/replies/5239521
