Most charitable nonprofits that are recognized as tax-exempt have an obligation to file an annual information return  with the IRS. (There are very few exceptions: church-affiliated organizations and governmental organizations are among those not required to file.) The IRS Form 990 is a public document, so make sure that your nonprofit's board reviews it before it's filed, and that it is completed thoughtfully as well as accurately. Look to the IRS website for guidance on annual reporting  of the Form 990. If a nonprofit is incorporated in a state but has never been recognized by the IRS as “tax-exempt,” then it does not have an obligation to file an annual information return with the IRS. Note: Conversely, even if your organization fits one of the few exceptions to mandatory annual filing with the IRS , it may still have to file forms annually in the state where it is incorporated, or where it engages in fundraising activities. See information on required state filings .
Most small tax-exempt organizations with gross receipts that are normally $50,000 or less must file the IRS form 990-N, known as the "e-postcard". 
Exceptions to this filing requirement include:
IRS information returns are known as the "990 series " because there are several forms that use the number 990, including Form 990 , Form 990-EZ , and for the smallest nonprofits, Form 990-N .
A charitable nonprofit’s Form 990 must be filed with the IRS on the 15th day of the 5th month  after the close of the nonprofit’s fiscal year.
If a charitable nonprofit fails to file the 990 on time, there can be penalties for late filing  and income tax liability . If a nonprofit fails to file for three years in a row, the nonprofit’s tax-exempt status will be automatically revoked. Learn more .
Loss of tax-exempt status: Organizations that lose their tax exempt status are no longer eligible to receive tax-deductible contributions, and may be required to pay corporate income tax. Read about what to do if your nonprofit’s status has been revoked .