Most IRS letters and notices are about federal tax returns or tax accounts. Note: You must complete a separate Form 3911 for each refund for which you are requesting information.Sending an IRS audit reconsideration request? You must submit the Employer Certification Letter as it appears in the template. Revenue will reject any requests with changes to the template. If you received a letter from the IRS, don't ignore it. Follow the directions on your letter, it includes all the information you need to respond. I received a letter from the IRS asking for additional information like w,-2 forms or other proof of income. If I didn't provide that, will they take my refund? Remember to include your name, only the last four digits of your Social Security number and refund amount in your e-mail request.