Tax990 Knowledge Base Have questions? We've got you covered! Get Answers Support Tax Pros General Where do I fill out the tax preparer's information? The tax preparer’s information must be filled out in the Signature Block of your 990 return. You can also provide the Tax Professionals information in My Accounts >> User Profile. Was this helpful? Yes No Need more help? Get in touch with our dedicated support team Contact Us (704) 839-2321 [email protected]