Originally Posted by vtx531

The standard base period includes the first four of the last five completed calendar quarters prior to when you filed your claim. The four calendar quarters in a year are: January – March, April – June, July – September and October – December.

So I read they go back a year. All the info is in the "Online Claim Filing Kit". It's a PDF that is two links under "what's new" in the middle of the page.