@lowtidesnook
From IRS Pub 505:
"January payment. If you file your 2024 Form 1040 or 1040-SR by January 31, 2025, and pay the rest of the tax you owe, you don’t need to make the payment due on January 15, 2025"
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Your issue will probably be that you won't be ready by 31 Jan 2025 to file, as you may not have all your forms yet. Others who have attempted this, found out too late, that certain tax forms they needed weren't ready in the software itself until sometime in Feb, and couldn't file by that deadline.
SO, Somehow, in the next week, you need to make a gross estimate of what your final 4th Qtr estimate needs to be and make one by the 15th. Not sure of what other stuff you might be dealing with, but, at least for Vanguard, I suspect you can see in your account, what distributions Vanguard made for the last quarter of 2024.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
