When is a thru date supposed to be for a PCS NCOER?

As it was said before, your thru date will be the day you sign out of leave, or the last day you worked for your rater. As for the non-rated codes, that would come from your next unit. It states that once you arrive to your new unit, you would traditionally get an extended annual to take in account for your transition leave.

Also, by signing your NCOER, you agree to the admin part. I would tell your rater, after you research the regulation yourself, that you will not sign the NCOER unless the thru date is updated.

Your thru date should be the date you sign out. Then your next will have non rated time for the time your were on leave

CORRECTION - EDITED - CORRECTION

Reference is AR 623-3 (I previously referenced 623-205, which is obsolete)

3-2. c. There are two types of evaluation reports: mandatory and optional. These types are further divided into evaluation reports requiring a 90–day minimum rating period and those that have an “other-than-90–day” minimum rating period requirement. To determine if a rated Soldier meets the minimum calendar-day requirement for an evaluation report described in this chapter, all nonrated time will be deducted from the total number of days in the period covered to determine if the Soldier has met the minimum rating period in the same position under the same rater.

*What date goes on your Change of Rater? Date you sign out from the unit, or 14 days prior to that date.

3-33. d. (4) ......However, if an event occurs that requires the preparation of an OER or NCOER (for example, “Change of Rater”) before the 12 rated months (365 rated days) have accumulated, an OER or NCOER will be rendered with a “THRU” date that corresponds with the event requiring an evaluation. Standard reason-for-submission codes (for example, code 03, “Change of Rater,” or code 04, “Change of Duty,” and so forth) will apply on these “Extended” reports that end before the required 12 rated months (365 rated days), even though the "period covered" on the OER or NCOER may exceed 1 calendar year. The “THRU” date will be determined by the rated Soldier’s circumstances. Each Soldier’s situation must be considered individually, just as each evaluation report must stand alone (see fig 3–1).

3-33 k. (3) To facilitate the rated Soldier signing the evaluation report after its completion and signature by the rating officials, the evaluation report may be signed and dated by each individual in the rating chain up to 14 days prior to the “THRU” date of the evaluation report.

*Type of report is Change of Rater.

3–40. “Change of Rater” report.
b. A code 03, “Change of Rater” NCOER, is mandatory when—
(1) The rated NCO ceases to serve under the immediate supervision of the rater and minimum rating qualifications have been met.