I got CP504 for the year 2024 to pay $25K, when I created my account with IRS I found that I owe $17K for 2023 and $20K for 2022. When I spoke to a Turbo rep. to resolve

[user17515348256]

it and was able to point out the problem and issued amendments accordingly. would that be enough for the IRS or do I have to do something else since a CP504 was issued?

[fanfare]

For best results respond in writing to the office that issued the letter, indicating your intention to AMEND those years.

@user17515348256 

[Opus 17 · Accepted solution]

You have 30 days (or whatever it says in the notice) to reply, otherwise you may forfeit your rights to challenge the assessment.  I would do one of two things:

1. Reply in writing, recount your telephone call and your explanation of the problem, that you will be filing amended returns for those years, and that as a result of the amendments, you don't believe you will owe any tax.  

2. Reply in writing, recount your telephone call and your explanation of the problem, and include the amended tax returns showing no tax owed (instead of mailing the amended returns separately).   Normally this would be the better option in my opinion, but depending on the deadline and how long it will take to prepare the amended returns, option 1 may be necessary instead. 

But you at least need to make some reply before the deadline to preserve your right to challenge the assessment.