My real question, which you didn't answer, is if I get a capital gain in the 3rd Q, do I owe estimated CA taxes for the 1st and 2nd Qs in the 3rd Quarter?

[TerryA · Accepted solution]

As Rick said in your first post, you can Annualize your income to show that the end of the year had more income than the first part. In TT/Calif in the Underpayment section it asks if you would like to Annualize - reply in the affirmative.