Terminated 401(k) plan

We have a 401(k) plan that terminated effective 03/31/19.  Last contributions were paid to John Hancock 03/04/19 and last participant distributions made 08/19/19.

For the final 2019 ADP testing, do we use comp only through 03/31/19 or the full year, or is it our choice?

What does your document and or termination amendment say?

14 hours ago, Cynchbeast said:

We have a 401(k) plan that terminated effective 03/31/19.

If that's the last date that deferrals could have been taken then that's the date.  If the resolution said "no deferrals after 3/4 (or whatever date - 2/28* maybe?) and the plan is term'd as of 3/31" then I'd use the earlier date.  Were there no deposits after 3/4 due to participant choice or other, maybe arbitrary reasons?

*To clarify, the deposit date is totally irrelevant.  It's the last payroll date that deferrals could have been taken that matters.