Form 990-N (e-Postcard) is filed by tax exempt organizations with gross receipts less than or equal to $50,000.
Form 990-EZ is for tax exempt organizations with gross receipts that come to less than $200,000 and $500,000 in total assets.
Form 990 is typically filed by tax exempt organizations with more than or equal to $200,000 in gross receipts or total assets more than or equal to $500,000.
Form 990-PF is filed by Exempt & Taxable Private Foundations as well as Non-exempt Charitable Trusts which the IRS treats as private foundations.
Form 1120-POL is typically filed by Political Organizations and certain Tax Exempt Organizations with taxable income remaining after taking the $100 special deduction for the taxable year.
Form 8868 (Extension Form) provides users with an extension of their Form 990 Information Return deadline for six months.