It is my understanding that you can't add an EACA mid-year. I have a profit sharing only plan that is adding a CODA mid-year. Since the EACA is tied to deferrals, I assume that the EACA can be added at the same time as the CODA.

Any thoughts?

Youy really only need an EACA if you are establishing a QACA or if you want to take advantage of the 90-day withdrawal right for participants in an auto enrollment program. If you have neither of those, you're certainly ok.