POWELL, Special Trial Judge: This case was heard pursuant to the provisions of section 7463 ¹ of the Internal Revenue Code in effect at the time the petition was filed. The decision to be entered is not reviewable by any other court, and this opinion should not be cited as authority.

Respondent determined a deficiency of $ 5,804 in petitioners' 1994 Federal income tax and an accuracy-related penalty under section 6662(a) of $ 1,161. The issues2002 Tax Ct. Summary LEXIS 138">*139 are (1) whether petitioners may claim a business bad debt deduction under section 166; (2) whether petitioners are liable for the accuracy-related penalty under section 6662(a); and (3) whether petitioner Marsha Skoller (Ms. Skoller) is entitled to relief from joint and several liability under section 6015.² Petitioners resided in Freehold, New Jersey, at the time the petition was filed.

Petitioners married on September 2, 1963, and separated in May of 2000. Petitioner Irwin I. Skoller (Mr. Skoller) is an attorney with an LL.M. in taxation from New York University School of Law. Ms. Skoller has a high school diploma. Since 1983, Mr. Skoller has operated a tax consulting and accounting business as a sole proprietor. Ms. Skoller worked in Mr. Skoller's office part time as an administrative assistant. 2002 Tax Ct. Summary LEXIS 138">*140 In addition to providing general office assistance, her duties included reconciling the bank statements, making deposits, and drafting checks at Mr. Skoller's direction. In 1994, Ms. Skoller left her employment at Mr. Skoller's office and started a typing business in her home.

In 1985, Mr. Skoller and Samuel L. Sachs formed Princeton Residential Associates Limited Partnership (PRA). PRA was a real estate venture in the business of purchasing residential real estate in East Windsor and West Windsor, New Jersey, for rental and resale. Mr. Skoller solicited clients from his tax practice to participate in the real estate venture.

In 1985 or early 1986, Mr. Skoller borrowed $ 60,000 to advance to PRA. Over the course of PRA's existence, the residential real estate market values in New Jersey declined. The values of PRA's homes fell below their purchase prices, and PRA did not have equity in its assets. As a result, no outside lenders would provide loans to PRA. In 1994, PRA sold its last house and apparently ceased doing business.

Mr. Skoller prepared petitioners' joint 1994 Federal income tax return. He reported the income and expenses from his tax practice on Schedule C, Profit or2002 Tax Ct. Summary LEXIS 138">*141 Loss from Business. On that Schedule C, petitioners claimed a $ 96,211 business bad debt deduction for amounts allegedly lent to PRA. The return also reflected wage income earned by Ms. Skoller, capital gains, a separate Schedule C from Ms. Skoller's typing service, and a Schedule E, Income or Loss From Partnerships & S Corporations, reporting losses from partnerships other than PRA. Ms. Skoller signed the return but did not examine or question it.

Petitioners appeared at trial pro se with respect to the business bad debt deduction and accuracy-related penalty issues. However, Ms. Skoller retained counsel with respect to the section 6015 relief from joint and several liability issue. After trial, notwithstanding the small tax case status, the Court directed the parties to file briefs. See Rule 177(c). Respondent filed a brief that addressed all of the issues. Ms. Skoller filed a brief addressing only the section 6015 relief from joint and several liability. Mr. Skoller did not file a brief.

             Discussion

[8] The failure to discuss in brief an issue that was previously raised results in the abandonment of that issue. See Calcutt v. Commissioner, 84 T.C. 716">84 T.C. 716, 84 T.C. 716">721 (1985).2002 Tax Ct. Summary LEXIS 138">*142 Mr. Skoller is an attorney and surely understood the importance of complying with directives from the Court. Thus, we deem that petitioners have abandoned the business bad debt deduction and section 6662(a) accuracy-related penalty issues.³ Additionally, we deem that Mr. Skoller has abandoned his opposition to granting relief from joint and several liability to Ms. Skoller. Because respondent concedes that Ms. Skoller is eligible for separate tax liability under section 6015(c), the only issue remaining is whether Ms. Skoller is entitled to relief under section 6015(b) or (f).

2002 Tax Ct. Summary LEXIS 138">*143 A requesting spouse may elect relief from joint and several liability under section 6015.⁴ There are three types of relief available: (1) Section 6015(b)(1) provides for full relief from joint and several liability; (2) section 6015(c) provides for separate tax liability available to divorced or separated taxpayers; and (3) section 6015(f) provides for equitable relief from joint and several liability if section 6015(b) and (c) is unavailable.

Section 6015(b) provides in part:

   SEC. 6015. RELIEF FROM JOINT AND SEVERAL LIABILITY ON JOINT

   RETURN.

     (b) Procedures for Relief From Liability Applicable to

     All Joint Filers. --

        (1) In general. -- Under procedures prescribed by the

 2002 Tax Ct. Summary LEXIS 138">*144        Secretary, if --

          (A) a joint return has been made for a taxable

          year;

          (B) on such return there is an understatement of

          tax attributable to erroneous items of one

          individual filing the joint return;

          (C) the other individual filing the joint return

          establishes that in signing the return he or

          she did not know, and had no reason to

          know, that there was such understatement;

          (D) taking into account all the facts and

          circumstances, it is inequitable to hold the

          other individual liable for the deficiency in tax

          for such taxable year attributable to such

          understatement; and

          (E) the other individual elects (in such form as

          the Secretary may prescribe) the benefits of2002 Tax Ct. Summary LEXIS 138">*145 this

          subsection not later than the date which is 2

          years after the date the Secretary has begun

          collection activities with respect to the

          individual making the election,

then the other individual shall be relieved of liability for tax (including interest, penalties, and other amounts) for such taxable year to the extent such liability is attributable to such understatement. [Emphasis added.]

These requirements are expressed in the conjunctive, and thus, a requesting spouse must satisfy all requirements of section 6015(b)(1). Subparagraphs (A), (B), and (E) are not in dispute. The parties disagree only as to whether Ms. Skoller satisfies the requirements of subparagraphs (C) and (D).

Subparagraph (C) requires that the requesting spouse "not know, and [have] no reason to know, that there was [an] understatement" of tax. Sec. 6015(b)(1)(C). There are two aspects of section 6015(b)(1)(C).⁵ First, "where a spouse seeking relief has actual knowledge of the underlying transaction * * * innocent spouse relief is denied." Cheshire v. Commissioner, 115 T.C. 183">115 T.C. 183, 115 T.C. 183">192-193 (2000),2002 Tax Ct. Summary LEXIS 138">*146 affd. 282 F.3d 326">282 F.3d 326 (5th Cir. 2002). For purposes here, we are willing to assume that Ms. Skoller did not have actual knowledge of the underlying transaction.

Nonetheless, she must still satisfy the second prong of section 6015(b)(1)(C). A requesting spouse has reason to know of an understatement if "a reasonably prudent person with knowledge2002 Tax Ct. Summary LEXIS 138">*147 of the facts possessed by the person claiming * * * [relief] should have been alerted to the possibility of a substantial understatement." Flynn v. Commissioner, 93 T.C. 355">93 T.C. 355, 93 T.C. 355">365 (1989). Furthermore, a "spouse seeking relief has a 'duty of inquiry'." Butler v. Commissioner, 114 T.C. 276">114 T.C. 276, 114 T.C. 276">284 (2000) (quoting Stevens v. Commissioner, 872 F.2d 1499">872 F.2d 1499, 872 F.2d 1499">1505 (11th Cir. 1989), affg. T.C. Memo 1988-63).

Respondent argues that Ms. Skoller was put on notice regarding petitioners' claimed $ 96,211 business bad debt deduction. We agree. "[A] spouse cannot obtain the benefits of section * * * [6015] by simply turning a blind eye to -- by preferring not to know of -- facts fully disclosed on the return, of such a large nature as would reasonably put such spouse on notice that further inquiry would need to be made." Levin v. Commissioner, T.C. Memo 1987-67; see also Cohen v. Commissioner, T.C. Memo 1987-537.

A reasonably prudent taxpayer should have been alerted to the possibility of an understatement on petitioners' 1994 Federal income tax return. On page 1 of Form 1040, U.S. Individual Income Tax Return, petitioners, 2002 Tax Ct. Summary LEXIS 138">*148 inter alia, reported $ 5,052 of income from Ms. Skoller's wages, a capital gain of $ 9,734, and an alleged $ 69,788 loss from Mr. Skoller's business. On page 2 of Form 1040 (the page Ms. Skoller signed), petitioners reported zero taxable income. Given the nature of Mr. Skoller's business, such a large operating loss would be unusual. A reasonable taxpayer in Ms. Skoller's situation would further inquire into the explanation behind the claimed loss. Ms. Skoller knew that Mr. Skoller operated a professional business and that petitioners held numerous partnership investments, but, as far as we can tell, the two were not interrelated. With those sources of income, a reasonably prudent taxpayer would be suspicious of reporting no taxable income.

In a remarkably similar situation, where the nonrequesting spouse was an accountant and prepared the joint return, we observed that the antecedent of section 6015(b)(1) "is designed to protect the innocent, not the intentionally ignorant. Thus, even though petitioner had no business background and was married to an accountant, we do not think that her 'ostrich imitation' was reasonable." Cohen v. Commissioner, T.C. Memo 1987-537 (fn. ref. omitted.) 2002 Tax Ct. Summary LEXIS 138">*149

Consequently, we find that Ms. Skoller had reason to know of the understatement of tax under section 6015(b)(1)(C) and is not entitled to relief under section 6015(b)(1).

However, as already stated, respondent concedes that Ms. Skoller is entitled to relief under section 6015(c). While Mr. Skoller originally opposed that relief, he abandoned that position by not filing a brief. In accordance with the positions of the parties, we hold that Ms. Skoller is entitled to separate tax liability under section 6015(c).⁶

Reviewed and adopted as the report of the Small Tax Case Division.

To reflect the foregoing, Decision will be entered under Rule 155.