I was under the impression that there was one Form 8962 per tax household which has a 1-to-1 match with tax returns. I know there is a line on Form 8962 for kids' incomes, but I thought that was only when they were little kids, not when they're adults filing their own returns.
What names are you putting at the top of Form 8962? With which tax return are you filing the Form 8962?
I'm certainly not an expert, especially on edge cases. So please take my questions as those of curiosity, not challenge.
ETA: It looks like you can only include your dependent's incomes on your Form 8962 - see instructions for line 2b. It doesn't sound to me like your adult child qualifies as your dependent, especially given your point #4 in post #14 where you're wanting to use the fact that they're not your dependent in order to make the HSA contribution.
Thank you for you question and I apologize to OP for the side track.
I have not applied for ACA policy, nor have I filled out Form 8962. I am just doing the analysis preparing for our situation: we are a family of 3 with one tax return for Married Filing Jointly, and one tax return by our adult child as Independent. We plan to purchase an ACA policy to include our adult child who is younger than 26.
According to Healthcare.gov below:
https://www.healthcare.gov/income-and-household-information/household-size/
Who to include in your household: our 'non-dependent child under 26' can sometimes 'Include them
only if you want to cover them on your Marketplace plan'.
So, our household size will be 3.
What to include as income: 'The Marketplace counts estimated income of all household members who are required to file a tax return.'
So, our household income will include our income + child's income
According to this article how to fill out Form 8962:
https://accountants-community.intuit.com/articles/1608778-completing-form-8962-premium-tax-credit
Completing Form 8962
Part 1, Lines 1 through 8b:
Most of the lines in Part 1 are calculated automatically from other parts of the return and from the tables found in the Form 8962 instructions. You may need to enter the clients dependent's income on line 2 before completing this form. This is because "Household income" includes the income from all members of the "Tax Family"
Part 2, Lines 9 through 23:
If your client
shared a policy with another taxpayer or was married during the year, please review the Table 3 and Table 4 questions in the IRS instructions to determine if additional calculations are needed. The information appearing in lines 11 (annual) or 12 through 23 (monthly), will be entered from Form 1095-A. Note: If more than one Form 1095-A was received for a single state, enter the amount from one for Line 11, Column B.
Part 4, Lines 30 through 34:
Use this section to report shared policy allocations. Review the IRS instructions for more information about how and when to complete this section.
If anyone has actually filled out Form 8962 with similar household situation, please kindly chime in. I am using TurboTax and certainly hope their question/answer section will account for 2 tax return income. I believe on our child's return, Form 8962 will also need to be included.
There is a discussion of shared policy allocations. I plan to put 100% in our tax return, and put 0% in our child's tax return for that.
The law says adult child under 26 can be included in parent's policy. It is how to include and calculate the total income becomes complicated.