The base period is the first four of the last five completed calendar quarters prior to the effective date of your claim. If your claim is filed in January, February, or March 2009, your base period is October 2007 through September 2008. If your claim is filed in April, May, or June 2009, your base period is January 2008 through December 2008. If your claim is filed in July, August, or September 2009, your base period is April 2008 through March 2009. If your claim is filed in October, November, or December 2009, your base period is July 2008 through June 2009. The wages earned in the base period determine your monetary entitlement. Click here to determine your base period.