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You are not eligible for a PTC when Married Filing Separately.  Click the link for IRS info on the PTC.

"You are eligible for the premium tax credit if you meet all of the following requirements:

• Have household income that falls within a certain range (see question 7).
• Do not file a Married Filing Separately tax return ((unless you qualify for a special rule that allows certain victims of domestic abuse and spousal abandonment to claim the premium tax credit using the Married Filing Separately filing status (see questions 9 and 10));
• Cannot be claimed as a dependent by another person; and
• In the same month, you, or a family member:
• Enroll in coverage (excluding “catastrophic” coverage) through a Marketplace plan
• Are not able to get affordable coverage through an eligible employer-sponsored plan that provides minimum value (see questions 11 and 12)
• Are not eligible for coverage through a government program, like Medicaid, Medicare, CHIP or TRICARE
• Pay the share of premiums not covered by advance credit payments"

Here's more info:

https://turbotax.intuit.com/tax-tips/health-care/what-is-the-premium-tax-credit/L6gAHB5ld