I am 19 and on a marketplace plan with my parents and 2 other siblings. How do I allocate the slcsp?

[Mike9241]

if your parents claim you as a dependent, there's nothing for you to file. if they don't, then those involved must agree on an allocation. Each month can use a different allocation %, but each column for a month must use the same % for all 3 columns. 

[SharonD007]

If you are their dependent, then you don't need to enter the 1095-A on your tax return. Your won't have any health insurance questions to answer on return.  TurboTax will tell you "Since someone is claiming you on their 2024 taxes, you don't have to complete Health Insurance".

If you're not a dependent on their return, both you, your parents, and siblings need to enter a copy of the Form 1095-A that you received on your tax returns. TurboTax will ask you questions about if the policy was shared with someone and how to allocate the costs and credit. 

1. Login to TurboTax.
2. Select Federal  and Deductions & Credits.
3. Scroll down to Medical and select Show More.
4. Select Start/Revisit next to Affordable Care Act (Form 1095-A).
5. Answer yes, I received Form 1095-A.
6. Enter the information and select Continue.
7. Select I shared this policy with another taxpayer who’s not on my taxes and Continue.
8. On the next screen you will enter the SSN for the one of your parents and the start and end months that you shared the policy with the other person. You only have to add one SSN of a person from the shared policy.
9.  Make sure all of the percentages for  your premium, your SLCSP, and your advance payment add up to 100% for everyone who shares the policy and enters it on their tax return. It should be an amount that everyone agrees on. It could be 25/25/25/25, 100/0/0/0, or another amount.  Check with your parents to see if they are willing to put 100% on their return and you putting 0% on your return.
10. TurboTax will calculate the information that should be on your return based on your answers.

You can review this TurboTax article I'm on my parents' 1095-A form. What do I do on my return? for more information.