Your IRS Form W-9 should have the corporation name and state, if outside the United States; if the name is domestic, please check the domestic box. If foreign, check the country of purpose box. (Note. If the name is written in bold on a business card, be sure to read over the business card before you write.)4. Provide your social security number (SSN), Tax Identification Number (TIN), or Employer Identification Number (EIN), depending on your nonprofit's country of purpose. The IRS requires the TIN of all non-citizens, and the EIN of all non-residents, unless exempt from filing. These pieces of information may be on your corporation documents.5. You may also include an email address where contact can be made for tax reporting purposes.6. Check both boxes next to the word “Form W-9.” You’ll receive a completed form.7. Fill out the form in a single sheet, so the IRS can scan it.8. You can't include this form with your income tax return, which is due by May 19th. Don’t wait until the end of the year, when your return is due.9. You can send this form to a PO Box or postal box in the state where your nonprofit operates. The IRS will scan it and send it to the correct place. Be sure to follow the IRS instructions on how to send your form. You can have multiple forms of nonprofit tax ID. The form you use may vary depending on your state's requirements. If the IRS requires your social security number, you should add it to the Form W-8BEN. Also, if your nonprofit is incorporated with the state, you will also want to add that to the form. The Form W-9 is not an ID card, and it may not be used for identification purposes. You should only send to a PO box or a postal box. This form serves as a tax return form. It shows on your tax return how you pay tax, and helps the IRS gather information if necessary. If you choose to send to a mailing address other than your tax return address, be sure to include the return address on your form. If you would like to report on a small group of 10 or more contributors, you may need to attach a Form W-2. You can find additional tax information with the IRS here and here. If you have any questions, you can contact a tax professional.