@jsm52said "Yes. $10,200 shows up on Line f, in additional income in the California Adjustments form. Also, the increase in taxes due is captured in 540 line 64 under Excess in Advance Premium Assistance Subsidy. "
I'm not in California, but that sounds like your line 64 is referring to the subsidy you received to help pay your ACA health insurance. Typically, if your income is too high, you have to pay back some of that subsidy. The Feds are supposedly waiving the repayment as part of the ARPA, but each state has to decide what to do with that income, too.
I will probably wait until the very last minute to file, in order for the Feds and my state to work through all the changes that came as part of ARPA. You might also want to wait to see how everything shakes out for you.
