(a) In general. (1) A determination may take the form of an agreement made pursuant to this section. This section is intended to provide an expeditious method for obtaining an adjustment under section 1311 and for offsetting deficiencies and refunds whenever possible. The provisions of part II (section 1311 and following), subchapter Q, chapter 1 of the Code, must be strictly complied with in any such agreement.

(2) An agreement made pursuant to this section will not, in itself, establish the tax liability for the open taxable year to which it relates, but it will state the amount of the tax, as then determined, for such open year. The tax may be the amount of tax shown on the return as filed by the taxpayer, but if any changes in the amount have been made, or if any are being made by documents executed concurrently with the execution of said agreement, such changes must be taken into account. For example, an agreement pursuant to this section may be executed concurrently with the execution of a waiver of restrictions on assessment and collection of a deficiency or acceptance of an overassessment with respect to the open taxable year, or concurrently with the execution and filing of a stipulation in a proceeding before the Tax Court of the United States, where an item which is to be the subject of an adjustment under section 1311 is disposed of by the stipulation and is not left for determination by the court.

(b) Contents of agreement. An agreement made pursuant to this section shall be so designated in the heading of the agreement, and it shall contain the following:

(1) A statement of the amount of the tax determined for the open taxable year to which the agreement relates, and if said liability is established or altered by a document executed concurrently with the execution of the agreement, a reference to said document.

(2) A concise statement of the material facts with respect to the item that was the subject of the error in the closed taxable year or years, and a statement of the manner in which such item was treated in computing the tax liability set forth pursuant to subparagraph (1) of this paragraph.

(3) A statement as to the amount of the adjustment ascertained pursuant to § 1.1314(a)-1 for the taxable year with respect to which the error was made and, where applicable, a statement as to the amount of the adjustment or adjustments ascertained pursuant to § 1.1314(a)-2 with respect to any other taxable year or years; and

(4) A waiver of restrictions on assessment and collection of any deficiencies set forth pursuant to subparagraph 3 of this paragraph.

(c) Execution and effect of agreement. An agreement made pursuant to this section shall be signed by the taxpayer with respect to whom the determination is made, or on the taxpayer's behalf by an agent or attorney acting pursuant to a power of attorney on file with the Internal Revenue Service. If an adjustment is to be made in a case of a related taxpayer, the agreement shall be signed also by the related taxpayer, or on the related taxpayer's behalf by an agent or attorney acting pursuant to a power of attorney on file with the Internal Revenue Service. It may be signed on behalf of the Commissioner by the district director, or such other person as is authorized by the Commissioner. When duly executed, such agreement will constitute the authority for an allowance of any refund or credit agreed to therein, and for the immediate assessment of any deficiency agreed to therein for the taxable year with respect to which the error was made, or any closed taxable year or years affected, or treated as affected, by a net operating loss deduction or capital loss carryover determined with reference to the taxable year with respect to which the error was made.

(d) Finality of determination. A determination made by an agreement pursuant to this section becomes final when the tax liability for the open taxable year to which the determination relates becomes final. During the period, if any, that a deficiency may be assessed or a refund or credit allowed with respect to such year, either the taxpayer or the Commissioner may properly pursue any of the procedures provided by law to secure a further modification of the tax liability for such year. For example, if the taxpayer subsequently files a claim for refund, or if the Commissioner subsequently issues a notice of deficiency with respect to such year, either may adopt a position with respect to the item that was the subject of the adjustment that is at variance with the manner in which said item was treated in the agreement. Any assessment, refund, or credit that is subsequently made with respect to the tax liability for such open taxable year, to the extent that it is based upon a revision in the treatment of the item that was the subject of the adjustment, shall constitute an alteration or revocation of the determination for the purpose of a redetermination of the adjustment pursuant to paragraph (d) of § 1.1314(b)-1.