(a) In general
In any administrative or court proceeding which is brought by or against the United States in connection with the determination, collection, or refund of any tax, interest, or penalty under this title, the prevailing party may be awarded a judgment or a settlement for—

(1) reasonable administrative costs incurred in connection with such administrative proceeding within the Internal Revenue Service, and

(2) reasonable litigation costs incurred in connection with such court proceeding.

(b) Limitations

(1) Requirement that administrative remedies be exhausted
A judgment for reasonable litigation costs shall not be awarded under subsection (a) in any court proceeding unless the court determines that the prevailing party has exhausted the administrative remedies available to such party within the Internal Revenue Service. Any failure to agree to an extension of the time for the assessment of any tax shall not be taken into account for purposes of determining whether the prevailing party meets the requirements of the preceding sentence.

(2) Only costs allocable to the United States
An award under subsection (a) shall be made only for reasonable litigation and administrative costs which are allocable to the United States and not to any other party.

(3) Costs denied where party prevailing protracts proceedings
No award for reasonable litigation and administrative costs may be made under subsection (a) with respect to any portion of the administrative or court proceeding during which the prevailing party has unreasonably protracted such proceeding.

(4) Period for applying to IRS for administrative costs
An award may be made under subsection (a) by the Internal Revenue Service for reasonable administrative costs only if the prevailing party files an application with the Internal Revenue Service for such costs before the 91st day after the date on which the final decision of the Internal Revenue Service as to the determination of the tax, interest, or penalty is mailed to such party.

(c) Definitions
For purposes of this section—

(1) Reasonable litigation costs
The term "reasonable litigation costs" includes—

(A) reasonable court costs, and

(B) based upon prevailing market rates for the kind or quality of services furnished—

(i) the reasonable expenses of expert witnesses in connection with a court proceeding, except that no expert witness shall be compensated at a rate in excess of the highest rate of compensation for expert witnesses paid by the United States,

(ii) the reasonable cost of any study, analysis, engineering report, test, or project which is found by the court to be necessary for the preparation of the party's case, and

(iii) reasonable fees paid or incurred for the services of attorneys in connection with the court proceeding, except that such fees shall not be in excess of $125 per hour unless the court determines that a special factor, such as the limited availability of qualified attorneys for such proceeding, the difficulty of the issues presented in the case, or the local availability of tax expertise, justifies a higher rate.

In the case of any calendar year beginning after 1996, the dollar amount referred to in clause (iii) shall be increased by an amount equal to such dollar amount multiplied by the cost-of-living adjustment determined under section 1(f)(3) for such calendar year, by substituting "calendar year 1995" for "calendar year 2016" in subparagraph (A)(ii) thereof. If any dollar amount after being increased under the preceding sentence is not a multiple of $10, such dollar amount shall be rounded to the nearest multiple of $10.

(2) Reasonable administrative costs
The term "reasonable administrative costs" means—

(A) any administrative fees or similar charges imposed by the Internal Revenue Service, and

(B) expenses, costs, and fees described in paragraph (1)(B), except that any determination made by the court under clause (ii) or (iii) thereof shall be made by the Internal Revenue Service in cases where the determination under paragraph (4)(C) of the awarding of reasonable administrative costs is made by the Internal Revenue Service.

Such term shall only include costs incurred on or after whichever of the following is the earliest: (i) the date of the receipt by the taxpayer of the notice of the decision of the Internal Revenue Service Independent Office of Appeals; (ii) the date of the notice of deficiency; or (iii) the date on which the first letter of proposed deficiency which allows the taxpayer an opportunity for administrative review in the Internal Revenue Service Independent Office of Appeals is sent.

(3) Attorneys' fees

(A) In general
For purposes of paragraphs (1) and (2), fees for the services of an individual (whether or not an attorney) who is authorized to practice before the Tax Court or before the Internal Revenue Service shall be treated as fees for the services of an attorney.

(B) Pro bono services
The court may award reasonable attorneys' fees under subsection (a) in excess of the attorneys' fees paid or incurred if such fees are less than the reasonable attorneys' fees because an individual is representing the prevailing party for no fee or for a fee which (taking into account all the facts and circumstances) is no more than a nominal fee. This subparagraph shall apply only if such award is paid to such individual or such individual's employer.

(4) Prevailing party

(A) In general
The term "prevailing party" means any party in any proceeding to which subsection (a) applies (other than the United States or any creditor of the taxpayer involved)—

(i) which—

(I) has substantially prevailed with respect to the amount in controversy, or

(II) has substantially prevailed with respect to the most significant issue or set of issues presented, and

(ii) which meets the requirements of the 1st sentence of section 2412(d)(1)(B) of title 28, United States Code (as in effect on October 22, 1986) except to the extent differing procedures are established by rule of court and meets the requirements of section 2412(d)(2)(B) of such title 28 (as so in effect).

(B) Exception if United States establishes that its position was substantially justified

(i) General rule
A party shall not be treated as the prevailing party in a proceeding to which subsection (a) applies if the United States establishes that the position of the United States in the proceeding was substantially justified.

(ii) Presumption of no justification if Internal Revenue Service did not follow certain published guidance
For purposes of clause (i), the position of the United States shall be presumed not to be substantially justified if the Internal Revenue Service did not follow its applicable published guidance in the administrative proceeding. Such presumption may be rebutted.

(iii) Effect of losing on substantially similar issues
In determining for purposes of clause (i) whether the position of the United States was substantially justified, the court shall take into account whether the United States has lost in courts of appeal for other circuits on substantially similar issues.

(iv) Applicable published guidance
For purposes of clause (ii), the term "applicable published guidance" means—

(I) regulations, revenue rulings, revenue procedures, information releases, notices, and announcements, and

(II) any of the following which are issued to the taxpayer: private letter rulings, technical advice memoranda, and determination letters.

(C) Determination as to prevailing party
Any determination under this paragraph as to whether a party is a prevailing party shall be made by agreement of the parties or—

(i) in the case where the final determination with respect to the tax, interest, or penalty is made at the administrative level, by the Internal Revenue Service, or

(ii) in the case where such final determination is made by a court, the court.

(D) Special rules for applying net worth requirement
In applying the requirements of section 2412(d)(2)(B) of title 28, United States Code, for purposes of subparagraph (A)(ii) of this paragraph—

(i) the net worth limitation in clause (i) of such section shall apply to—

(I) an estate but shall be determined as of the date of the decedent's death, and

(II) a trust but shall be determined as of the last day of the taxable year involved in the proceeding, and

(ii) individuals filing a joint return shall be treated as separate individuals for purposes of clause (i) of such section.

(E) Special rules where judgment less than taxpayer's offer

(i) In general
A party to a court proceeding meeting the requirements of subparagraph (A)(ii) shall be treated as the prevailing party if the liability of the taxpayer pursuant to the judgment in the proceeding (determined without regard to interest) is equal to or less than the liability of the taxpayer which would have been so determined if the United States had accepted a qualified offer of the party under subsection (g).

(ii) Exceptions
This subparagraph shall not apply to—

(I) any judgment issued pursuant to a settlement; or

(II) any proceeding in which the amount of tax liability is not in issue, including any declaratory judgment proceeding, any proceeding to enforce or quash any summons issued pursuant to this title, and any action to restrain disclosure under section 6110(f).

(iii) Special rules
If this subparagraph applies to any court proceeding—

(I) the determination under clause (i) shall be made by reference to the last qualified offer made with respect to the tax liability at issue in the proceeding; and

(II) reasonable administrative and litigation costs shall only include costs incurred on and after the date of such offer.

(iv) Coordination
This subparagraph shall not apply to a party which is a prevailing party under any other provision of this paragraph.

(5) Administrative proceedings
The term "administrative proceeding" means any procedure or other action before the Internal Revenue Service.

(6) Court proceedings
The term "court proceeding" means any civil action brought in a court of the United States (including the Tax Court and the United States Court of Federal Claims).

(7) Position of United States
The term "position of the United States" means—

(A) the position taken by the United States in a judicial proceeding to which subsection (a) applies, and

(B) the position taken in an administrative proceeding to which subsection (a) applies as of the earlier of—

(i) the date of the receipt by the taxpayer of the notice of the decision of the Internal Revenue Service Independent Office of Appeals, or

(ii) the date of the notice of deficiency.

(d) Special rules for payment of costs

(1) Reasonable administrative costs
An award for reasonable administrative costs shall be payable out of funds appropriated under section 1304 of title 31, United States Code.

(2) Reasonable litigation costs
An award for reasonable litigation costs shall be payable in the case of the Tax Court in the same manner as such an award by a district court.

(e) Multiple actions
For purposes of this section, in the case of—

(1) multiple actions which could have been joined or consolidated, or

(2) a case or cases involving a return or returns of the same taxpayer (including joint returns of married individuals) which could have been joined in a single court proceeding in the same court,

such actions or cases shall be treated as 1 court proceeding regardless of whether such joinder or consolidation actually occurs, unless the court in which such action is brought determines, in its discretion, that it would be inappropriate to treat such actions or cases as joined or consolidated.

(f) Right of appeal

(1) Court proceedings
An order granting or denying (in whole or in part) an award for reasonable litigation or administrative costs under subsection (a) in a court proceeding, may be incorporated as a part of the decision or judgment in the court proceeding and shall be subject to appeal in the same manner as the decision or judgment.

(2) Administrative proceedings
A decision granting or denying (in whole or in part) an award for reasonable administrative costs under subsection (a) by the Internal Revenue Service shall be subject to the filing of a petition for review with the Tax Court under rules similar to the rules under section 7463 (without regard to the amount in dispute). If the Secretary sends by certified or registered mail a notice of such decision to the petitioner, no proceeding in the Tax Court may be initiated under this paragraph unless such petition is filed before the 91st day after the date of such mailing.

(3) Appeal of Tax Court decision
An order of the Tax Court disposing of a petition under paragraph (2) shall be reviewable in the same manner as a decision of the Tax Court, but only with respect to the matters determined in such order.

(g) Qualified offer
For purposes of subsection (c)(4)—

(1) In general
The term "qualified offer" means a written offer which—

(A) is made by the taxpayer to the United States during the qualified offer period;

(B) specifies the offered amount of the taxpayer's liability (determined without regard to interest);

(C) is designated at the time it is made as a qualified offer for purposes of this section; and

(D) remains open during the period beginning on the date it is made and ending on the earliest of the date the offer is rejected, the date the trial begins, or the 90th day after the date the offer is made.

(2) Qualified offer period
For purposes of this subsection, the term "qualified offer period" means the period—

(A) beginning on the date on which the first letter of proposed deficiency which allows the taxpayer an opportunity for administrative review in the Internal Revenue Service Independent Office of Appeals is sent, and

(B) ending on the date which is 30 days before the date the case is first set for trial.