CalHFA clarified its 3-years IRS Transcripts submission requirement on the CalHFA Loan Submission Checklist. Please make sure you refer to this most current checklist dated March 28, 2018. This checklist can be found in CalHFA's Mortgage Access System (MAS) as well on the CalHFA webpage in the Tools, Affidavits & Docs section.
Thank you for your continued partnership with CalHFA.