Do all Nonprofit entities have to file Form 990 each year ?

NO. In general, nonprofit entities with total yearly "gross" receipts over $50,000 must file federal form 990 annually. There are exceptions of organizations who do not have to file. In general, Churches government agenciesand certain political organizations do not have to file any form. If gross annual receipts are equal to or greater than $200,000 or its total assets are equal or greater than $500,000 the Form 990 must be used instead of form 990--EZ.