Congressional law says that any NPO not filing required 990 returns with the IRS for three consecutive years will automatically lose tax-exempt status. This is called automatic revocation. The first time the three-year rolling requirement came into play was for years ending December 31, 2009 with the filing deadline of May 15, 2010.
On June 8, 2011, the IRS published the first list of organizations subject to automatic revocation.