Dear Mari-Anne,
Please accept my sincere condolences for your loss. It is good that you are planning to pay the Estimated Tax Liability by the due date of the 4th Quarter payment deadline of January 15, 2025.
What you will do when you're filing the 2024 taxes, do the long form to calculate penalty, Form 2210, it is called the Annualized Income method to show that you received this additional 401K inheritance money in the 4th Quarter. The annualized income method allows you to make estimated payments based on the actual percentage of annual income received in a given quarter.
Hope this helps.
Have an amazing day. Amita R (CPA 10+ years)
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https://www.irs.gov/instructions/i2210
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