Form 990 is an information return that most organizations claiming federal tax-exempt status must file yearly with the IRS. Complete Parts VIII, IX, and X of Form 990. 5.Complete item G in the heading section of Form 990, on page 1. 6. Do not enter social security numbers on this form as it may be made public. 1 File IRS Form 990. Disclaimer: The National Council of Nonprofits is not engaged in the practice of law and this chart does not constitute legal advice. Find 990 forms of private foundations, public charities, and other nonprofits. Complete the dues form and submit payment. U.S. Tax Exempt Organizations complete IRS Form 990. Check all that apply: Initial return.