Form W-9 must be postmarked by April 15, 2018. When the tax is calculated, it will appear on the last page of the page marked “Form W-9.” Requests for Form W-9 (Rev. October 2018) — IRS Request for Form W-9 (Rev. October 2018). IRS Form W-9 (Rev. October 2018). Department of the Treasury. Internal Revenue Service JACKSONVILLE, FL 32202 Enter your TIN in the appropriate box. Give Form to the requester. Do not send to the IRS. Jacksonville, FL 32202 Note: Check the appropriate box in the line above for the tax after they were published, go to. Form W-9 must be postmarked by April 15, 2018. When the tax is calculated, it will appear on the last page of the page marked “Form W-9.” Tax Returns and Instructions (PDF) Fill the following information in the spaces provided. If you are filing electronically, check the box marked “For use with Internet Returns.” Do this on pages 1-5. For other forms, fill out the instructions for that form on the previous page. You must submit any additional information electronically to the IRS. Fill in and file the tax return. For forms, fill up each page separately, if possible. Print the instructions and send to the IRS (if the electronic filer). You will need to print the form and fax it to the IRS. Tax Returns and Directions (PDF) Fill in and file the Tax Return. To complete IRS Form 8379, “Report as Required.” (See below). Fill out Form 8379 and pay any required tax owed. Give Form 2848 to the person. Form 2848 is used to notify creditors of a bankruptcy proceeding. Have the person complete the form and send it to the Bankruptcy Office. A default will result in the debt going to the IRS. Give Form 2848 to the person to whom your refund was paid. If you did not pay the refund yourself, fill out the form and send it to the IRS. Have the person complete the form and send it to the Bureau of the Consumer Financial Protection Bureau (CFPB) by email via CFPB. Forms can be mailed. Do not email. Complete the form and mail it to the IRS.