39 CFR §3030.267

1. (a)Each request will identify the banked rate adjustment authority available as of the date of the request for each class of mail and the available amount for each of the preceding 5 years.
2. (b)Rate adjustments may use existing banked rate adjustment authority in amounts greater than the limitations described in § 3030.245.
3. (c)Increases will exhaust all banked rate adjustment authority for each class of mail before imposing additional rate adjustments in excess of the maximum rate adjustment for any class of mail.