The Connecticut Department of Revenue Services sent letters to certain businesses who file sales tax use tax returns regarding a change in their filing frequency, effective January 1, 2007. Under the new rules, taxpayers, whose annual liabilities have been $1,000 and below, have been asked to switch to an annual filing status. Annual returns for 2007 will be due January 31, 2008. (DRS E-News, Connecticut Department of Revenue Services, March 2, 2007)