I didn't take my RMD for 2024 from an inherited IRA because TIAA never disbursed it. They haven't issued a 1099 either. How do i show this on 1040 and 5329 and 1040sch 2?

If you haven't taken the RMD then take it as soon as possible. Since you take it in 2025 it will be taxable in 2025. You also will need to take the RMD for 2025. Therefore, you will have two RMDs on your 2025 tax return.

You will need to file Form 5329 and request a waiver of the penalty if you have reasonable cause. Please see Relief for Reasonable Cause for additional information.

If you do not have a Form 1099-R to file this can only be done using the "forms" mode which is only available with the TurboTax Desktop software:

1. Enter the forms mode and click on "Open Form" and type "5329".
2. Scroll down to Part IX line 52b and enter the RMD amount that should have been taken. On line 53b enter the amount of the RMD that was actually taken (probably zero if it was missed).
3. Then in the box right under line 53 "Waiver of Tax Smart Worksheet" enter the same amount as line 52 (the RMD amount) under A. 
4. Click the "Explanation" button and enter the reason for missing the RMD and your statement requesting a waiver.

If using the TurboTax Online version and have no 2023 Form 1099-R to file, you will have to prepare the 5329 manually.

Download Form 5329 from the IRS website and fill it out the same as above. Print and mail your return with the 5329 form and explanation attached as described in the 5329 instructions.

The 2024 Form 5329 must be attached to your printed and mailed 2024 tax return and cannot be e-filed.

Please be aware that you can only use this method if you are requesting a waiver of the penalty and there is no taxable amount on Form 5329 form line 55 that must be transferred to Schedule 2 line 8.