Learn how to write a letter to the IRS with our comprehensive guide and sample. Includes ChatGPT prompt.You can find the CP or LTR number on the right corner of the letter. You can deduct a part of your medical and dental expenses, and amounts you paid for certain taxes, interest, contributions, and other expenses. This is the letter I am drafting to the IRS and I will have to paper file. I am not sure who should sign the letter, myself or the taxpayer. Here is a list of forms that household employers need to complete. • Schedule H (Form 1040) for figuring your household employment taxes. Here is a sample letter that you may start with and make the necessary changes to personalize it for your particular situation. The IRS said in early January that it started issuing these letters in December to those who received advance child tax credit money last year.