Hi no worries... yes your IRA contribution was $8000 which is the limit for 2024 (assume you're over 50) not $8004.63. Also assuming your Modified AGI is above the limit for your filing status to make this entirely non-deductible, and you had "earned income" above $8000.
there are 2 things needed to drive the rest
1) the MV of 0 is telling Form 8606 (Line 6) about your total IRAs which in this case is just one account that's now zero
2) you also need the 1099-R which feeds 8606 (Line 😎 with the distribution/conversion amount of $8004.63. I don't think Vanguard has released 1099's yet.
You won't need to input the 4.63 directly, Form 8606 does the calculation. I would advise reviewing the final 8606 line items.
This is a good article which shows what the final 8606 should look like
https://www.whitecoatinvestor.com/pennies-and-the-backdoor-roth-ira/
If you want to test the process you can mock up a 1099-R by putting 8004.63 in boxes 1+2, check box 2b "taxable amount not determined", select code 2 in box 7 and check IRA/SEP/SIMPLE - but pls do not rely on this and wait/update for the actual 1099-R from Vanguard for filing. When you put the 1099-R into TT you will get to the "what did you do with the money" screen and here you will put in the total Roth conversion amount which will feed 8606 Line 8.
You will also get form 4598s on the IRA accounts which just confirm the transactions and market values, not sure timing of those from Vanguard but they are not needed to file (as conversions can happen right up until filing deadline and then final 4598s go out in May but if you did yours last calendar year you may get one now from Vanguard).
Again to caveat I'm not a CPA/Expert, just my 2 cents to the best of my knowledge.
