Normally the IRS sends them if you had a balance due in a previous year. If that is not the case for you, I am not sure why they sent them. If you are so inclined, you can contact the IRS at 1-800-829-1040 and they may be able to shed some light on the reason why they were mailed to you.
As mentioned before, you can safely ignore these forms if you do not have a balance due on your 2024 return and do not need to make estimated tax payments for 2025.
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