You can find the CP or LTR number on the right corner of the letter. Locate the closest Taxpayer Assistance Center to you.In this article, we will provide you with a detailed guide on the steps involved in writing a letter to the IRS. Call the IRS if you disagree with the letter. If you cannot pay the tax due, you may have options. Please file a separate Excel Tangible Template for each account that represents the individual taxing jurisdiction within Hillsborough County. Does anyone have sample letters to the IRS for different situations? Maybe one with code numbers and explainations. To request a tax refund, file an Application for Refund - Sales and Use Tax (Form DR-26S) or Application for Refund - All Other Taxes (Form DR-26). Affected taxpayers in specified counties will have until Feb.