Follow the instructions on the IRS notice to reply. In your reply, provide proof of the cost basis that was missed along with an explanation.
If there is a phone number to call on the notice, you could also try calling the IRS and speaking to an agent to determine the best way to pay the tax still due. This will ensure your IRS notice is addressed instead of having any additional interest or penalties assessed on the unanswered IRS notice. Please see this link for additional guidance.
If the IRS agent suggests amending, then you can go ahead and amend 2022 using these instructions.
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