20 C.F.R. § 404.285
Each year, we examine the earnings record of every retired, disabled, and deceased worker to see if the worker's primary insurance amount may be recomputed under any of the methods we have described. When a recomputation is called for, we perform it automatically and begin paying the higher benefits based on your recomputed primary insurance amount for the earliest possible month that the recomputation can be effective. You do not have to request this service, although you may request a recomputation at an earlier date than one would otherwise be performed (see § 404.286 ). Doing so, however, does not allow your increased primary insurance amount to be effective any sooner than it would be under an automatic recomputation. You may also waive a recomputation if one would disadvantage you or your family (see § 404.287 ).
20 C.F.R. §404.285