Have a Tax Question? Ask a Tax Expert
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You can call the IRS at 1-***-***-**** to inquire. But the process is not as good as it should be. I can suggest an alternative.
Better is going to www.irs.gov and asking for a transcript of your tax account for the year in question. https://www.irs.gov/individuals/get-transcript is the link to the web page to ask. You can get the information online right away, or a paper copy is sent upon request.
If you used a tax pro to file your original return, consider asking him to assist. IRS has a practitioner's priority line phone number just for tax pros if you prefer. He can ask about the notice as well.
I hope this gives you options to proceed. Positive feedback is appreciated. Rating my assistance closes out your inquiry, and credits me with assisting. I'mCustomer