The recent Tax Court memorandum decision in Lisa Marie Walsh v. Commissioner, T.C. Memo. 2025-91 (filed August 26, 2025), offers significant insights into the application of Section 6015 relief from joint and several liability, particularly concerning the doctrines of res judicata and the various factors considered for equitable relief. This article details the factual background, the taxpayer’s request, the court’s legal analysis, and the ultimate conclusions, providing a technical overview for tax professionals.

Factual Background

Lisa Marie Walsh (Petitioner) married Brendan Walsh in April 1999 and they had two children. While Ms. Walsh, a high school graduate, held a real estate agent’s license and operated a parasol business (Persolé, LLC) and an interior design business, Mr. Walsh was the primary income earner, making approximately $30,000 monthly from his insurance business. Ms. Walsh managed household utility and child-related expenses. The couple maintained an affluent lifestyle, residing in a $1.4 million home in Novato, California, being members of the Marin County Country Club, holding season tickets for San Francisco Giants baseball games, and owning a Maserati and a BMW. Their children attended private school.

During their marriage, the Walshes filed joint Forms 1040, U.S. Individual Income Tax Return, which were prepared by a Certified Public Accountant, Patrick J. Carlin. Ms. Walsh assisted Mr. Carlin by providing information related to her businesses, home mortgage interest statements, and property tax documents, and she granted him permission to electronically file their joint returns.

The Walshes had a history of federal income tax noncompliance, including failure to timely file returns, pay reported liabilities, and appropriately report income tax liabilities for 2012 and 2013, leading to both understatements and underpayments. While returns for 2011 and 2014-2016 were timely filed without understatements, there were significant underpayments for these years. The total amounts due for the years in issue (2011-2016) ranged from $20,170 to $74,049. The Internal Revenue Service (IRS) later determined that the amounts due for 2012, 2014, 2015, and 2016 were fully attributable to Mr. Walsh, while portions of the liabilities for 2011 ($37,387) and 2013 ($4,504) were attributable to Ms. Walsh.

In 2014, the IRS selected the Walshes’ 2011 return for examination, followed by the 2012 and 2013 returns in 2015. A Notice of Deficiency was issued in June 2016 for 2011-2013. The Walshes hired Edward I. Kaplan to represent them, and he timely filed a petition with the Tax Court. In September 2018, the IRS and Mr. Kaplan executed a Stipulation of Settled Issues, leading to a Tax Court decision in February 2019 related to 2011-2013. Notably, innocent spouse relief was not raised in this prior deficiency case. Ms. Walsh testified she was not involved with the examination or the prior court case, though Revenue Agent C. Kim testified to speaking with Ms. Walsh on multiple occasions during the examination.

Ms. Walsh separated from Mr. Walsh in January 2017 and filed for divorce in December 2017. The Superior Court of California entered a judgment of dissolution in June 2021, awarding Ms. Walsh spousal and child support, and dividing marital assets. The Superior Court also determined that the Forms 1040 liabilities were joint and several, to be divided equally between the parties, with an indemnification clause for any party paying more than their half. During the divorce proceedings, Ms. Walsh accepted responsibility for these liabilities. The Superior Court found that the Walshes’ failure to pay federal tax liabilities allowed them to maintain their lavish lifestyle.

Following her legal separation, Ms. Walsh filed Forms 1040 late for 2017-2020 and had outstanding tax liabilities for those years. She also omitted significant income from her 2021 return, including alimony payments and divorce equalization payments, and had not filed her 2022 return at the time of trial.

Taxpayer’s Request for Relief from Joint and Several Liability

On or around May 13, 2020, Ms. Walsh filed a request for innocent spouse relief. She indicated on Form 8857 that she did not know if the joint returns showed balances due and claimed she "doesn’t know how to read a tax return," becoming aware of the "extraordinary tax bill" only in January 2020. She also asserted that Mr. Walsh changed their IRS mailing address without her knowledge.

Ms. Walsh reported substantial monthly income ($11,851) and expenses ($10,639) when requesting relief. While she did not indicate domestic violence or physical abuse on Form 8857, she stated Mr. Walsh made her afraid to disagree due to his control of financial decisions. At trial, she alleged emotional and financial abuse by Mr. Walsh. Mr. Walsh, in response, stated Ms. Walsh provided tax information to their CPA, had full knowledge of and access to joint assets, paid bills from joint accounts, and signed e-file permissions.

The IRS issued a final determination denying her request for relief in November 2021, which Ms. Walsh timely disputed by petitioning the Tax Court in February 2022.

Court’s Legal Analysis and Application to the Facts

The Tax Court has limited jurisdiction under Section 7442, and its jurisdiction to review a stand-alone innocent spouse relief petition is governed by Section 6015(e). For petitions filed on or after July 1, 2019, the scope of review is limited to the administrative record, newly discovered or previously unavailable evidence, and trial testimony, applying a de novo standard. The requesting spouse, Ms. Walsh, bears the burden of proving her entitlement to relief under Rule 142(a).

Relief for 2011-2013: Res Judicata

The Court first addressed Ms. Walsh’s request for relief for 2011-2013, consider