I completely understand. This is from the Form 8962 instructions.
Advance payment of the premium tax credit (APTC). APTC
is a payment during the year to your insurance provider that pays
for part or all of the premiums for a qualified health plan covering
you or an individual in your tax family. Your APTC eligibility is
based on the Marketplace’s estimate of the PTC you will be able
to take on your tax return. If APTC was paid for you or an
individual in your tax family, you must file Form 8962 to reconcile
(compare) this APTC with your PTC. If the APTC is more than
your PTC, you have excess APTC and you must repay the
excess, subject to certain limitations. If the APTC is less than
the PTC, you can get a credit for the difference, which reduces
your tax payment or increases your refund.
Note. The Marketplace determined your eligibility for and the
amount of your 2017 APTC using projections of your income and
your number of personal exemptions when you enrolled in a
qualified health plan. If this information changed during 2017 and
you did not promptly report it to the Marketplace, the amount of
APTC paid may be substantially different from the amount of
PTC you can take on your tax return. See Report changes in
circumstances when you re-enroll in coverage and during the
year, earlier, for changes that can affect the amount of your PTC
