34 C.F.R. § 686.35
(a) Change in enrollment status.
(2)
(b) Change in cost of attendance. If the student's cost of attendance changes at any time during the award year and his or her enrollment status remains the same, the institution may, but is not required to, establish a policy under which the student's TEACH Grant award for the payment period is recalculated. If such a policy is established, it must apply to all students in the TEACH Grant-eligible program.
(Authority: 20 U.S.C. 1070g, et seq.)