MEMORANDUM OPINION

KORNER, Judge: This matter is before the Court on respondent's motion in each case for leave to amend his answer so as to assert the applicability of section 6621(d), ² as added by section 144 of the Tax Reform Act of 1984, Pub. L. 98-369, 98 Stat. 682.

1985 Tax Ct. Memo LEXIS 355">*357 Section 6621(d)provides for an increase in the interest rate due on underpayments where there is a "substantial underpayment" (an underpayment exceeding $1,000) in any taxable year "attributable to 1 or more tax motivated transactions." Sec. 6621(d)(1) and (2). A "tax motivated transaction" is defined as:

(i) any valuation overstatement (within the meaning of section 6659(c)),

(ii) any loss disallowed by reason of section 465(a) and any credit disallowed under section 46(c)(8),

(iii) any straddle (as defined in section 1092(c) without regard to subsections (d) and (e) of section 1092), and

(iv) any use of an accounting method specified in regulations prescribed by the Secretary as a use which may result in a substantial distortion of income for any period. [Sec. 6621(d)(3)(A)]

In each of the instant cases, respondent contends that there was an underpayment in excess of $1,000, which was attributable to a "straddle," as defined in section 1092(c), and hence to a tax motivated transaction.

Under section 1092(c), the1985 Tax Ct. Memo LEXIS 355">*358 term "straddle" means "offsetting positions with respect to personal property." A taxpayer holds such "offsetting positions," in turn, when "there is a substantial diminution of [his] risk of loss from holding any position with respect to personal property by reason of his holding 1 or more other positions with respect to personal property * * *." Section 1092(c)(2)(A).

Under section 6214(a), this Court has jurisdiction to consider a claim by respondent for an increased deficiency or addition to tax at any time before entry of a final decision. Ferrill v. Commissioner,684 F.2d 261">684 F.2d 261, 684 F.2d 261">265 (3d Cir. 1982), affg. per curiam a Memorandum Opinion of this Court; Henningsen v. Commissioner,243 F.2d 954">243 F.2d 954 (4th Cir. 1957), affg. 26 T.C. 528">26 T.C. 528 (1956). However, it is clear that the right to amend a pleading under section 6214(a) is not unqualified. Section 7453 expressly authorizes this Court to adopt rules governing practice before it. Pursuant to Rule 41(a), ³ pleadings may be amended after the case has been placed on a trial calendar and over the1985 Tax Ct. Memo LEXIS 355">*359 objection of the opposing party only by leave of the Court "when justice so requires." If there is evidence of surprise or substantial disadvantage to petitioner, respondent's motion to amend should be denied because it is the purpose of section 6214(a) to give petitioner a fair opportunity to answer and resist the claim before it is considered by the Court. 684 F.2d 261">Ferrill v. Commissioner,supra at 265; 243 F.2d 954">Henningsen v. Commissioner,supra at 959.

In a recent Court reviewed opinion, Law v. Commissioner,84 T.C. No. 64 (May 23, 1985), we denied a motion filed by respondent after his opening brief and the taxpayers' answering brief, but before his reply brief, to amend his answer so as to assert additional interest under section 6621(d). On the facts of that case, we determined that while the proposed amendment might not require a further trial, it did present new legal issues of which the taxpayers were without notice when they submitted their answering brief. Since respondent had asserted numerous alternative grounds for disallowance1985 Tax Ct. Memo LEXIS 355">*360 of the partnership losses there in issue, not all of which were "tax motivated transactions," within the meaning of section 6621(d)(3)(A), we found the potential for severe prejudice to the taxpayers, as follows:

In cases involving alternative grounds, the Commissioner may contend that section 6621(d) requires us to decide issues which we might otherwise avoid, in order that the additional interest may be collected. On the other hand, the petitioner might maintain that, if no difference in the amount of the deficiency would result, we must decide the case on a ground, if available, which is not a "tax motivated transaction" for purposes of section 6621(d). Furthermore, if we were to decide that there is a deficiency on several alternative or overlapping grounds, some of which are listed as "tax motivated transactions" and some of which are not, the parties may dispute whether all, a part, or none of such underpayment is "attributable to" the "tax motivated transactions." [684 F.2d 261">Law v. Commissioner,supra.]

The trial in the instant cases was held in Dallas, Texas between May 16 and May 19, 1984. On motion of petitioners, the Court ordered on May 19, 1984, that1985 Tax Ct. Memo LEXIS 355">*361 the record would remain open until August 17, 1984, so as to allow time for petitioners to take the testimony of an additional witness. On August 6, 1984, petitioners moved, with respondent's concurrence, to close the record and to establish a briefing schedule. Petitioners' motion was granted on August 8, 1984, and initial briefs were filed in October (for petitioners) and November (for respondent) of 1984, and reply briefs were filed by both parties in mid-January of 1985. Respondent's instant motions were filed almost four months later, on May 6, 1985. In each such motion, respondent represents that "[d]iscussions with opposing counsel reveal that this motion is opposed."

The principal issue in these cases involves the deductibility of losses resulting from petitioners' alleged dispositions in a London "principals market" ⁴ of certain forward contracts, each of which allegedly constituted one "leg" of a commodity straddle in gold and platinum. As in Law, respondent has raised numerous alternative grounds for disallowance of the losses, including the following: (1) The alleged contracts were fictitious or preconceived shams lacking economic substance; (2) the primary1985 Tax Ct. Memo LEXIS 355">*362 profit motive test applies, and petitioners' primary motives for entering into the transactions in issue were not to realize an economic profit, but to defer taxes; and (3) even if the transactions were not shams and were engaged in with a primary profit motive, petitioners' resulting losses were capital rather than ordinary losses.

In the event that we uphold respondent's positions on the basis of his second or third theories, supra, it appears that any underpayment would be attributable to a "tax motivated transaction," viz, a straddle as defined in section 1092(c).⁵ However, if we uphold respondent's position on the basis of his first theory, supra, then the losses in issue would have derived from fake or fictitious transactions which would not be recognized for Federal income tax purposes. See Julien v. Commissioner,82 T.C. 492">82 T.C. 492 (1984). Cf. Miller v. Commissioner,84 T.C. No. 55 (May 13, 1985). 1985 Tax Ct. Memo LEXIS 355">*363 In that event, it could hardly be contended (and it does not appear on the full record in this matter that respondent so contends) that the transactions constituted real straddles, "as defined in section 1092(c)," excerpted supra.

In his instant motions, as in Law, respondent has thus raised numerous alternative grounds for disallowance, not all of which are "tax motivated transactions," as defined in section 6621(d)(3)(A).⁶ The same considerations that formed the basis for our denial of respondent's motion in Law, therefore compel our1985 Tax Ct. Memo LEXIS 355">*364 denial of his motions in the instant cases. ⁷

1985 Tax Ct. Memo LEXIS 355">*365 An appropriate order will be issued.