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Online hasn't opened yet.  Check back in a couple weeks.  I saw Dec 17 on a screen shot.  You can buy the Desktop program now.   You can buy the Desktop Download program here or in stores or online like Amazon, Costco, etc. https://turbotax.intuit.com/personal-taxes/cd-download You need a full Windows 11 or Mac OS Sonoma 14 computer to install it.

I think it would be worth your while to contact Mass DOR and / or a tax professional. Note the statement:  "Please also note that for tax years beginning on or after January 1, 2024, married couples must file a joint Massachusetts return if they filed a joint federal income tax return, unless one of the spouses wasn’t required to file a Massachusetts return because their Massachusetts gross income was $8,000 or less. The Department of Revenue will issue guidance providing for an exemption from the requirement or an adjustment in some cases where one or both spouses is a nonresident." Unless you yourself have MA-source income, it seems unlikely that you would be required to file a MA tax return at all. Note: I am neither a lawyer nor a tax professional..

It's not clear what you mean by "amended my mistake." Did you actually file an amended tax return, Form 1040-X? Just making the changes in TurboTax doesn't do anything. You have to send the Form 1040-X to the IRS. Depending on when you did it, you might have been able to e-file the amended tax return. Otherwise you have to mail it to the IRS.  

@mytax26 for simplicity, assume that the capital gains tax is 15%.   Just make that estimated payment now.     What is your income (including your capital gains) and your filing status.   Depending on your response, I may tweak my simple answer.     Federal payments can be made at this website:   https://www.irs.gov/payments/direct-pay-with-bank-account   When you complete your tax return, TT will ask you if you made estimated payments, so you should be all set there.   Yes, there is a more complicated way to figure out if you are subject to underpayment penalties, but this is the simple approach.     your question was how to calculate the tax and make the estimated payment.  The question was not how to calculate whether or not you are subject to underpayment penaties :-).

1) The program is likely incomplete at this time (all other versions are not either - they're essentially in beta stage).   2) Are you sure you chose the correct tax year for your return? This is a common error and is very easy to overlook.

@SandyG19    In this Public forum, We can't see what you did or didn't do that resulted in the increased penalty. ....BUT...purely guessing one possible situation: The penalty calculated by TTX "might" be the amount if you had paid your taxes due to CA before 15 April.   If you didn't pay all of it by 15 April, then the extra $$ assessed by CA may be due to your not paying on time, so they added some more penalty/interest.  i.e. the extension only extends the data/paperwork filing date...not the 15 April payment deadline.   Not sure what they might adjust for folks in the January L.A. county declared disaster area, if it was supposed to apply to you.....but you could always call the FTB and ask what you need to do if that is your situation...there should be a telephone number on their letter.