1. Yes, after entering all the information in the 2024 amended return you will see how much tax is due. You can pay this with the IRS website (best way), where you can select the year, or you can select within TurboTax to have the tax due withheld from your account. If the IRS charges any interest or fees they will mail you a notice after they processed your amended return and you can pay this on the IRS website.
2. Yes, you can amend 2024 now to add the 6% penalty. And you should pay the tax due as soon as possible.
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