Refund carry-forward.

If a corporation or virtually exempt entity claims a refund on any tax return and, concurrent with or subsequent to filing the return upon which that refund is claimed, is required to pay an estimated tax, and at the time of paying that tax the refund has not been paid, the corporation or virtually exempt entity may deduct the amount of that refund from the first installment of estimated taxes and may deduct any excess from the succeeding installments.