38 CFR §21.5830

1. (a)Timing and release of payments. VA will pay educational assistance to the individual on the last day of the calendar month during which the individual enters or reenters training.
2. (b)Period covered by payments. The payments cover those expenses, listed in § 21.5820(a) incurred for the period beginning on the commencing date of the individual's subsistence allowance and ending on the ending date of the individual's subsistence allowance. See § 21.5831.