see this about the form
https://www.irs.gov/individuals/understanding-your-cp2057-notice
Does the notice state what to do if you disagree?
if not you have several options
A) call the iRS you might have a long wait or not even get through
- Call 1-800-829-1040 between the hours of 7:00 AM – 7:00 PM local time.
- Press “1” for English or “2” for Spanish.
- Press “2” for “answers about your personal income taxes.”
- Press “1” for “questions about a form you have already submitted or a payment or to order a tax transcript.”
- Press “3” for “all other questions about your tax history or payment.”
- Press “2” for “all other questions about your tax history or payment.”
- Do not input your Social Security Number when the recording tells you to.
- Press “2” for “personal- or individual-tax related question.”
- Press “3” for “all other inquiries.”
- Wait to be connected to someone at the IRS.
B) UseThe Audit Defense service provided by TaxResources, Inc., also called TaxAudit.com, in partnership with TurboTax. If you paid for Audit Defense and you received a notice, call TaxResources, Inc. at 877-829-9695, or report your notice on their website at http://intuit.taxaudit.com/. Do not contact the tax agency until you have spoken to TaxResources. They may contact them on your behalf.
