If I have a Safe Harbor plan with the Safe Harbor matching option for salary deferral contributions, should I use characteristic code '2K' for this? '2K' would be used if the Safe Harbor match is considered a 401(m) arrangement; however, since the Safe Harbor match is not subject to 401(m) discrimination testing, is it really considered part of a 401(m) arrangement? The instructions DO specify that QMACs should not use the '2K' characteristic code, and the Safe Harbor match seems to me to have more in common with QMACs than with regular matching contributions subject to ACP testing. How are other people reporting the Safe Harbor matching and, for that matter, with the SIMPLE 401(k) matching contribution on line 8(a) of the 5500 Form?