If all three people are doing separate tax returns, the percentages that you should enter for your premium, your SLCSP, and your advance payment should be an amount that you and the people you share it with agree on. It could be 33/33/34 or another amount. Make sure you are in agreement and that the percentages on the tax returns add up to 100% together.
If two people are filing on one tax return and you're filing, you just need to make sure both tax returns add up to 100%.
TurboTax will calculate the information that should be on your return based on your answers.
To enter your health insurance reported on Form 1095-A, refer to the TurboTax Help article Where do I enter my 1095-A?
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