U.S. Corporation Income Tax (Form 1120)

The Form 1120, "U.S. Corporation Income Tax Return" is used by domestic corporations to report income, gains, losses, deducations and credits and to figure the incom tax liability.
It's due by the 15th day of the 4th month after the end of the corporation tax year.
OSM fiscal year goes from July 01 to June 30.

Return of Organization Exempt From Income Tax (Form 990)

The Form 990, "Return of Organization Exempt from Income Tax" is used by tax-exempt organizations, nonexempt charitable trusts, and section 527 political organizations to provide the Internal Revenue Service (IRS) with the information required by Section 6033.
Form 990 is due on the 15th day of the 5th month following the end of the organization's taxable year.

Annual Filing for Charitable organisations (New York State)

The From CHAR500 represents the Annual Filing for Charitable Organizations that registered organizations are required to submit annually to the New York State Charities Bureau.
Open Source Matters is registered as a Not for Profit Corporation to the NYS Charities Bureau since 2007, with the NY State Reg. N. 40-39-53.