What is the max number of characters allowed for IRS for individual names. I have this suggestion diagnostic in PTO: "Taxpayer's name is being truncated in the e-file. The IRS may delay the posting of the taxpayer's return and, if applicable, any refund.".  Agent via Live Chat responded that 40 is the max number allowed. I have client totaling 37 characters including spaces (first name last name first name last name). Why diagnostic? and How to fix? Thank you