[¶ 1] Steven Goumas appeals from a judgment entered in the Superior Court (Kennebec County, Studstrup, J.) dismissing as barred by the doctrine of res judica-ta his complaint, brought pursuant to 36 M.R.S.A. § 151 (1990 & Supp.1999) and M.R. Civ. P. 80C, in which Goumas challenged the State Tax Assessor’s authority to assess income taxes on his income earned at the Portsmouth Naval Shipyard. Finding no error, we affirm.
I. BACKGROUND
[¶ 2] Steven Goumas is a New Hampshire resident employed as a civilian federal employee at the Portsmouth Naval Shipyard. Goumas asserts that the Shipyard is located in New Hampshire and not in Maine. Based on this belief, Goumas and other similarly situated New Hampshire residents filed a class action suit seeking relief from taxes due or refunds of taxes paid during tax years 1989 through 1992 and seeking inter alia a declaration that income of class members earned at the Shipyard “at any and all times” is not taxable by the State of Maine. The class was certified on October 3, 1994, representing nonresident employees of the Shipyard. The certification of the class required certain class members to continue to pursue administrative remedies regarding the assessment of each year’s income-taxes as time progressed. Accordingly, members of the class were required to file timely challenges to the assessment of taxes, but resolution and enforcement of the taxes was effectively stayed throughout the pendency of the class action. See, e.g., 36 M.R.S.A. § 175-A (1990 & Supp.1999).
[¶ 3] Goumas and the other members of the class, however, failed to prosecute their action. On June 12, 1998, the Superior Court dismissed the suit with prejudice for failure to prosecute. While the class action was pending, Goumas had continued to challenge the Assessor’s annual determination that he owed income taxes to the State of Maine. Consistent with the requirements of his certification as a class member, in 1997, Goumas sought a reconsideration of the Assessor’s determination that he owed Maine income taxes for tax years 1992 through 1995. The Assessor concluded that the assessments were not in error. On October 15, 1997. Goumas appealed the Assessor’s reconsideration decisions to the Superior Court pursuant to 36 M.R.S.A. § 151 and M.R. Civ. P. 80C. Because resolution of the class action would render the obligatory Rule 80C action moot, no action was taken on the Rule
[¶ 4] Once the class action suit was dismissed with prejudice, the Superior Court addressed Goumas’s Rule 80C complaint, and, after motion and hearing, dismissed the complaint because Goumas was a member of the class and could not, therefore, relitigate the same cause of action regarding Maine’s authority to tax his income. This appeal followed.
II. DISCUSSION
[¶ 5] We review de novo the Superior Court’s legal conclusion that the current claim is barred by the application of the doctrine of res judicata.
See Draus v. Town of Houlton,
[¶ 6] Here, the first three elements are indisputably present. First, both Goumas and the Assessor, the parties before us, were parties in the class action. Second, the first suit was decided on the merits, and a valid final judgment was entered.
See Johnson v. Samson Constr. Corp.,
[¶ 7] In determining whether two cases involve the same cause of action, we apply the “transactional test.”
Draus,
[¶ 8] In his first action, as a member of the class, Goumas asserted that he was a resident of New Hampshire; that he earned income at the Portsmouth Naval Shipyard; that the State Tax Assessor had assessed and declined to return income taxes against his earnings at the Shipyard; that the Shipyard is located in Portsmouth, New Hampshire, and “has never been located within the State of Maine”; and that income earned at the Shipyard is “not properly subject to Maine Income Tax.” The court consolidated the action filed by Goumas and others with another pending action that also challenged the taxing of income earned at the Shipyard.
[¶ 9] The court certified two classes and defined the Goumas class as consisting of “all nonresident individuals (for Maine income tax purposes) who
were, are or will become
Federal civilian employees
who have timely pursued or actually do timely pursue
their administrative remedies” on the grounds that the Shipyard is not locat
[¶ 10] The document that brings Goumas before us now, filed in the Superior Court, consisted of a two-paragraph letter, purporting to be a complaint, in which he petitioned for review of his 1992 through 1995 taxes and set forth exactly the same argument: “My contention is that the Portsmouth Naval Shipyard is located in Rockingham County, Portsmouth, New Hampshire, and that the State of Maine has no jurisdiction in taxing my wages for State of Maine income tax purposes.” As is apparent, both the class action suit and the current complaint are “founded upon the same nucleus of operative facts.” Both suits were generated by the actions of the State of Maine in taxing Goumas’s income and both presented the same cause of action — determining whether the State of Maine is authorized to tax the income of nonresident civilian employees at the Portsmouth Naval Shipyard. 2
[¶ 11] Moreover, Goumas seeks exactly the same remedy in the matter before us as he did in the class action — a judicial determination that the State of Maine may not impose an income tax on him because his income was earned in New Hampshire. Because Goumas has already litigated his claim that the State of Maine may not impose an income tax upon his Shipyard earnings for the tax years 1992 through 1995 as well as other years, and failed to prevail in that litigation, he may not now relitigate the same cause of action.
[¶ 12] Accordingly, we conclude that the two suits were founded on the same nucleus of facts and sought the same redress, thus constituting the same cause of action for purposes of the doctrine of res judica-ta. The Superior Court, therefore, did not err in concluding that the current suit is barred.
The entry is:
Judgment affirmed.
Notes
. A second class was certified to include residents of New Hampshire earning income at the Shipyard who had not or did not perfect their challenges against the Assessor. Relief for those class members would be granted only prospectively through declaratory and injunctive relief.
. Goumas does not challenge the amount, calculation, or basis of the taxes assessed by the State Tax Assessor except to argue that the Shipyard is not in Maine and, thus, that the Assessor lacked the authority to assess taxes on income earned there.
