Did you receive a notice? If so, it may contain instructions for you to follow if you disagree with the changes. You can contact the IRS at the phone number listed on the notice. If you do not have the notice, please see How do I contact the Internal Revenue Service (IRS)? for more information, including the IRS phone number and hours of operation. You may want to try calling right when they open since they have been very busy throughout the day.
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