No, you do not need enter the 2020 1099-R on your 2020 unless you had federal taxes withheld in box 4 or state taxes in box 14. If you already entered the 2020 1099-R on your 2020 tax return then you do not need to delete since TurboTax will know to ignore it for 2020 because of the codes in box 7.
Yes, once you finished the 2019 amendment it will show how much you owe. When you first start it will go to $0 and then when you enter the information it will show you how much you owe.
Yes, you will mail the Form 1040X, the new Form 1040, the 1099-R and payment on the tax due. Please see Where to File Addresses for Taxpayers Filing Form 1040X.
You can also pay the amount due online: IRS Paying Your Taxes
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