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Instead of mailing a check, I suggest you pay online.  Go to https://www.irs.gov/payments to make an online payment.  Be sure to indicate it is a 2024 Extension Payment.     If you want to mail a 4868, go to:  https://www.irs.gov/pub/irs-pdf/f4868.pdf and fill out the form and print it.  The instructions with the mailing address are included.

For an inherited IRA with basis, the names on 8606 should be "<owner> and <your name> BENE" or Beneficiary if it fits, and your SSN.   TurboTax won't prepare such a form. You can get the form in fillable PDF format on the IRS website. After e-Filing you can mail it attached to Form 1040-X . Explanation: "form not included with e-File due to software issues"   Note: when you are not changing any dollar amounts on your amending 1040-X, you can leave all the lines 1-23 EMPTY. - Done this way, you sign 1040-X, not 8606. Do not include your old 1040 nor your revised 1040 because they are identical.   @Proteus7 

Go through my tax filing for 4yrs, from 2020 to 2023. Look at Schedule E and its worksheet. I believe there is a bug in 2023 calculation of carry over or disallowed loss. You have to manually fix it. I use turbotax desktop version.  Instead of using step by step filing, go to top-right corner, click on the forms, look for the rental property Schedule E work sheet, check line 21 and 22 numbers, that is your loss and allowed loss.  In the carryovers to 2024 Smartwork sheet, that is QBI value calculated from previous years. Check all previous years QBI and carry over, to see if there is any left over to 2024. You can see QBI tracking sheet of previous years following this table.  I saw Turbotax do messed up on 2018/2019 but correct later on. Don't know why the software messed up again this year. In my case, previous two year QBI number is zero, so I can set my QBI number, error check identified cell, to zero.