Estate Tax Refund Suit without Full Payment

§ 7422. Civil actions for refund(a) No suit prior to filing claim for refundNo suit or proceeding shall be maintained in any court for the recovery of any internal revenue tax alleged to have been erroneously or illegally assessed or collected, or of any penalty claimed to have been collected without authority, or of any sum alleged to have been excessive or in any manner wrongfully collected, until a claim for refund or credit has been duly filed with the Secretary, according to the provisions of law in that regard, and the regulations of the Secretary established in pursuance thereof. (b) Protest or duressSuch suit or proceeding may be maintained whether or not such tax, penalty, or sum has been paid under protest or duress. (c) Suits against collection officer a barA suit against any officer or employee of the United States (or former officer or employee) or his personal representative for the recovery of any internal revenue tax alleged to have been erroneously or illegally assessed or collected, or of any penalty claimed to have been collected without authority, or of any sum alleged to have been excessive or in any manner wrongfully collected shall be treated as if the United States had been a party to such suit in applying the doctrine of res judicata in all suits in respect of any internal revenue tax, and in all proceedings in the Tax Court and on review of decisions of the Tax Court. (d) Credit treated as paymentThe credit of an overpayment of any tax in satisfaction of any tax liability shall, for the purpose of any suit for refund of such tax liability so satisfied, be deemed to be a payment in respect of such tax liability at the time such credit is allowed.