
462 F.Supp.2d 35 (2006)
Hamlet C. BENNETT, Plaintiff,
v.
UNITED STATES of America, Defendant.
Civil Action No. 05-2297(RMC).
United States District Court, District of Columbia.
November 21, 2006.
*36 Hamlet C. Bennett, Holualoa, HI, pro se.
Beatriz T. Saiz, U.S. Department of Justice, Tax Division, Pat S. Genis, U.S. Department of Justice, Washington, DC, for Defendant.

MEMORANDUM OPINION
COLLYER, District Judge.
Plaintiff Hamlet C. Bennett filed a pro se Complaint against the United States (the "Government"), alleging that beginning with tax year 1995, the Internal Revenue Service ("IRS") "recklessly, intentionally, or by reason of negligence disregarded" various provisions of Title 26 of the U.S.Code in connection with the collection of federal tax. Compl. ¶¶ 1 & 7. This Complaint is among the scores of nearly identical pro se complaints filed in the U.S. District Court for the District of Columbia over the past year seeking a refund, damages, and injunctive relief against further collection of federal taxes. See, e.g., Gaines v. United States, 424 F.Supp.2d 219, 221 (D.D.C.2006) (collecting cases); Def.'s Mem. in Supp. of Mot. to Dismiss at 2 n. 1 (Government estimates more than 60 such complaints have been filed in this District).
Mr. Bennett requested a Clerk's entry of default, and the Clerk entered default against the Government on February 28, 2006. Mr. Bennett now moves for entry of default judgment, and the Government moves to vacate the entry of default and to dismiss the Complaint. The Court will deny the motion for default judgment and will grant the motion to vacate entry of default and the motion to dismiss because: (1) the Government has shown good cause to vacate the entry of default; (2) Mr. Bennett failed to exhaust his administrative remedies, a prerequisite to a suit for damages for wrongful collection of taxes or for a tax refund; and (3) Mr. Bennett's injunction claim is barred by the Anti-Injunction Act, 26 U.S.C. § 7421(a).

I. LEGAL STANDARDS
The Government moves to dismiss pursuant to Federal Rules of Civil Procedure 12(b)(1), (2), (3), (5), and (6). The Court will grant its motion under Rules 12(b)(1) and (6). Under Rule 12(b)(1), which governs motions to dismiss for lack of subject matter jurisdiction, a plaintiff bears the burden of establishing by a preponderance of the evidence that the Court possesses jurisdiction. See Shekoyan v. Sibley Int'l Corp., 217 F.Supp.2d 59, 63 (D.D.C.2002); Pitney Bowes Inc. v. U.S. Postal Serv., 27 F.Supp.2d 15, 19 (D.D.C.1998). It is well established that, in deciding a motion to *37 dismiss for lack of subject matter jurisdiction, a court is not limited to the allegations set forth in the complaint "but may also consider material outside of the pleadings in its effort to determine whether the court has jurisdiction in the case." Alliance for Democracy v. Fed. Election Comm'n, 362 F.Supp.2d 138, 142 (D.D.C. 2005); see Lockamy v. Truesdale, 182 F.Supp.2d 26, 30-31 (D.D.C.2001).
A motion to dismiss pursuant to Federal Rule of Civil Procedure 12(b)(6) challenges the adequacy of a complaint on its face, testing whether a plaintiff has properly stated a claim. "[A] complaint should not be dismissed for failure to state a claim unless it appears beyond doubt that the plaintiff can prove no set of facts in support of his claim which would entitle him to relief." Conley v. Gibson, 355 U.S. 41, 45-46, 78 S.Ct. 99, 2 L.Ed.2d 80 (1957). In deciding a 12(b)(6) motion, the Court "may only consider the facts alleged in the corn plaint, documents attached as exhibits or incorporated by reference in the complaint, and matters about which the Court may take judicial notice." Gustave-Schmidt v. Chao, 226 F.Supp.2d 191, 196 (D.D.C.2002) (citation omitted).

II. DISCUSSION
A. Clerk's Entry of Default
Default judgments are disfavored by modern courts. Jackson v. Beech, 636 F.2d 831, 835 (D.C.Cir.1980). Accordingly, under Federal Rule of Civil Procedure 55(c), so long as judgment has not yet been entered, a default may be set aside for "good cause shown." Id. (quoting Fed. R.Civ.P. 55(c)). The decision to set aside an entry of default rests in the discretion of the district court. Keegel v. Key West & Caribbean Trading Co., Inc., 627 F.2d 372, 373 (D.C.Cir.1980). In exercising such discretion, a court must consider whether
(1) the default was willful,
(2) a set-aside would prejudice plaintiff, and
(3) the alleged defense was meritorious.
Id. Federal courts favor trials on the merits. Id. at 374.
The Government neglected to respond to the complaint for approximately three months, but excuses this delay by explaining that service of process was faulty. While Mr. Bennett personally served the Attorney General and U.S. Attorney, he failed to serve the IRS. Proper service of process (or waiver of service) is a prerequisite to the Court's exercise of personal jurisdiction over a defendant. Murphy Bros. Inc. v. Michetti Pipe Stringing Inc., 526 U.S. 344, 350, 119 S.Ct. 1322, 143 L.Ed.2d 448 (1999). Federal Rule of Civil Procedure 4(i) prescribes whom to serve when the federal government is a defendant as follows:
(i) Serving the United States, Its Agencies, Corporations, Officers, or Employees
(1) Service upon the United States shall be effected
(A) by delivering a copy of the summons and of the complaint to the United States attorney for the district in which the action is brought or to an assistant United States attorney or clerical employee designated by the United States attorney in a writing filed with the clerk of the court or by sending a copy of the summons and of the complaint by registered or certified mail addressed to the civil process clerk at the office of the United States attorney and
(B) by also sending a copy of the summons and of the complaint by registered or certified mail to the Attorney General of the United States at Washington, District of Columbia, and

*38 (C) in any action attacking the validity of an order of an officer or agency of the United States not made a party, by also sending a copy of the summons and of the complaint by registered or certified mail to the officer or agency.
Because Mr. Bennett failed to serve the IRS, there was an error in effecting service and the Government neglected to respond timely. But now the Government has responded and seeks to set aside the default and dismiss the suit. There is no indication that the Government's delay was willful or that Mr. Bennett will be prejudiced if the Court sets aside the default. In light of this, as well as the Court's preference for resolving disputes on their merits and the validity of the Government's defense as explained infra, the Court finds good cause to set aside the Clerk's entry of default.
B. Damages Claims
Mr. Bennett invokes the subject matter jurisdiction of the Court pursuant to 26 U.S.C. § 7433, which provides a cause of action for damages for certain violations of Title 26. Compl. ¶ 1. That statute provides:
If, in connection with any collection of Federal tax with respect to a taxpayer, any officer or employee of the Internal Revenue Service recklessly or intentionally, or by reason of negligence disregards any provision of this title, or any regulation promulgated under this title, such taxpayer may bring a civil action for damages against the United States in a district court of the United States. Except as provided in [26 U.S.C. §] 7432, such civil action shall be the exclusive remedy for recovering damages resulting from such actions.
26 U.S.C. § 7433(a). However, section 7433 also explicitly requires that administrative remedies be exhausted as a predicate to suit: "A judgment for damages shall not be awarded . . . unless the court determines that the plaintiff has exhausted the administrative remedies available to such plaintiff within the Internal Revenue Service." Id. § 7433(d)(1). The IRS, in turn, has promulgated regulations that mandate that damages actions under § 7433 "may not be maintained unless the taxpayer has filed an administrative claim." 26 C.F.R. § 301.7433-1(a). Administrative claims must be submitted to the "Area Director, Attn: Compliance Technical Support Manager" and must include, inter alia, the grounds for the claim, a description of the injury incurred, including a dollar amount, and any substantiating documentation. Id. § 301.7433-1(e)(2). Until the IRS rules on a properly filed claim, or six months pass without a ruling, no civil action for damages will lie. Id. § 301.7433-1(d); see also Gaines, 424 F.Supp.2d at 221-22 (describing statutory and regulatory scheme); Turner v. United States, 429 F.Supp.2d 149, 151 (D.D.C. 2006) (same).
There are no exceptions to the exhaustion requirement set forth in section 7433. Id. at 152. In Turner, the taxpayer did not contest that he had failed to exhaust his administrative remedies, but instead argued that it would be futile to make the attempt because the administrative remedies were allegedly unavailable or inadequate. The court found this argument unavailing because "when exhaustion is mandated by statute, courts are not free to carve out exceptions that are not supported by the text." Id.; accord Lindsey v. United States, 448 F.Supp.2d 37, 51 (D.D.C.2006); see also Jaeger v. United States, No. 06-625, 2006 WL 1518938 (D.D.C. May 26, 2006) (where a taxpayer failed to state any basis for his claim of exhaustion in his boilerplate complaint or in response to the court's order to show cause, there was no dispute that the plaintiff *39 failed to exhaust and the case was dismissed).
The Government argues in its motion to dismiss that Mr. Bennett failed to exhaust his administrative remedies. The boilerplate Complaint alleges in conclusory fashion that Mr. Bennett has satisfied the exhaustion requirement. See Compl. ¶ 6 ("Plaintiff has exhausted all administrative remedies. . . ."); id. ¶ 24 ("Administrative claims which plaintiff filed with the [IRS] and the Secretary of the Treasury worked to satisfy the requirement that a `taxpayer' must exhaust administrative remedies. . . ."); id. ¶ 29 (alleging that plaintiff has exhausted all administrative remedies before bringing this suit by petitioning for refunds). However, Mr. Bennett provides no specific information in his response to the motion to dismiss or any other pleading regarding the dates or contents of these alleged administrative claims. Indeed, Mr. Bennett concedes that he failed to exhaust his administrative remedies, as he did not contest this issue in his response to the motion to dismiss. "It is well understood in this Circuit that when a plaintiff files an opposition to a motion to dismiss addressing only certain arguments raised by the defendant, a court may treat those arguments that the plaintiff failed to address as conceded." Hopkins v. Women's Div., Gen. Bd. of Global Ministries, 238 F.Supp.2d 174, 178 (D.D.C.2002) (citing FDIC v. Bender, 127 F.3d 58, 67-68 (D.C.Cir.1997)).
Further, Mr. Bennett concedes he has not exhausted his administrative remedies by arguing that filing an administrative claim would have been futile because the IRS "has articulated a very clear position on the issues regarding its collection activity involving plaintiff(s) [sic] which it has demonstrated it is unwilling to reconsider." Resp. to Mot. to Vacate at 3-11. This contention is unavailing, as futility is not an exception to the exhaustion requirement set forth in section 7433, and this Court is "not free to carve out exceptions that are not supported by the text." Turner, 429 F.Supp.2d at 152.
Mr. Bennett also argues that he is not required to exhaust administrative remedies because the regulation that requires exhaustion, 26 C.F.R. § 301.7433-1, is an invalid, unreasonable interpretation of the statute. This argument is baseless. Because Mr. Bennett has not even attempted to comply with the regulation, his claim that the regulation is invalid is not ripe. Moreover, Chevron requires that the Court defer to the agency's reasonable interpretation of the statute. Chevron, U.S.A v. Natural Res. Defense Council, Inc., 467 U.S. 837, 104 S.Ct. 2778, 81 L.Ed.2d 694 (1984). The statute specifically requires the IRS to create an administrative scheme in order to allow individuals to resolve administratively claims for damages caused by an unauthorized collection action. 26 U.S.C. § 7433(d)(1) ("A judgment for damages shall not be awarded . . . unless the court determines that the plaintiff has exhausted the administrative remedies available to such plaintiff within the Internal Revenue Service."). The regulation merely sets forth the scheme for filing an administrative claim. The Court defers to the IRS's reasonable interpretation of section 7433.
In sum, there is no dispute that Mr. Bennett failed to exhaust his administrative remedies, a mandatory prerequisite to suit. Because Mr. Bennett failed exhaust, he has failed to state a claim for relief. Pursuant to Federal Rule of Civil Procedure 12(b)(6), the Court will dismiss the claim for damages under section 7433 without prejudice.[1]
*40 C. Refund Claims
Mr. Bennett also seeks a tax refund, Compl. ¶ 33, pursuant to 28 U.S.C. § 2846, which vests jurisdiction in the district courts over
[a]ny civil action against the United States for the recovery of any internal-revenue tax alleged to have been erroneously or illegally assessed or collected, or any penalty claimed to have been collected without authority or any sum alleged to have been excessive or in any manner wrongfully collected under the internal-revenue laws.
28 U.S.C. § 2846(a)(1); U.S. v. Dalm, 494 U.S. 596, 602, 110 S.Ct. 1361, 108 L.Ed.2d 548 (1990). The right to bring such an action, however, is limited by 26 U.S.C. § 7422, which requires the exhaustion of administrative remedies as follows:
No suit or proceeding shall be maintained in any court for the recovery of any internal revenue tax alleged to have been erroneously or illegally assessed or collected, or of any penalty claimed to have been collected without authority, or of any sum alleged to have been excessive or in any manner wrongfully collected, until a claim for refund or credit has been duly filed with the Secretary, according to the provisions of law in that regard, and the regulations of the Secretary established in pursuance thereof.
26 U.S.C. § 7422(a). The Supreme Court has described this requirement as one of administrative exhaustion. U.S. v. Williams, 514 U.S. 527, 532-33, 115 S.Ct. 1611, 131 L.Ed.2d 608 (1995) ("Under 26 U.S.C. § 7422, a party may not bring a refund action without first exhausting administrative remedies. . . . ").
The exhaustion requirement in 26 U.S.C. § 7422 is jurisdictional, based on the plain language of the statute. Lindsey, 448 F.Supp.2d AT 51-52 (citing Arbaugh, 126 S.Ct. at 1245 ("If the Legislature clearly states that a threshold limitation on a statute's scope shall count as jurisdictional, then courts and litigants will be duly instructed.")). "By its plain terms, the provision precludes a civil action from proceeding in federal court before the plaintiff files a refund claim with the Secretary of the Treasury and complies with the administrative procedures adopted by the Secretary." Lindsey, 448 F.Supp.2d at 51-52.
Again, the form Complaint asserts only in the most conclusory fashion that Mr. Bennett has satisfied the exhaustion requirement. See Compl. ¶¶ 6, 24, 29. In response to the motion to dismiss, Mr. Bennett does not contest that he failed to exhaust his administrative remedies. He provides no specific information in any pleading regarding the dates or contents of these alleged administrative claims for a *41 refund. Moreover, a suit for refund of taxes may not be maintained in any court unless a claim for refund has been filed, Dalm, 494 U.S. at 602, 110 S.Ct. 1361, and the taxpayer has fully paid the tax assessment, Flora v. United States, 362 U.S. 145, 177, 80 S.Ct. 630, 4 L.Ed.2d 623 (1960). Mr. Bennett seeks an injunction to prevent the IRS from collecting taxes due. This implies that Mr. Bennett, in fact, has not fully paid the tax assessments.[2] Since he has not fully paid, he may not maintain a suit for a refund. See id. Thus, because this Court does not have jurisdiction over Mr. Bennett's refund claim, the refund claim will be dismissed for lack of subject matter jurisdiction under Federal Rule of Civil Procedure 12(b)(1).
D. Claim for Injunctive Relief
Mr. Bennett also seeks an order "enjoining the [IRS] . . . from engaging in any further collection activity . . . until all claims are fully resolved, and the return of all sums wrongfully collected" occurs. Compl. ¶ 34. This request is barred by the Anti-Injunction Act ("AIA"), which provides:
[N]o suit for the purpose of restraining the assessment or collection of any tax shall be maintained in any court by any person, whether or not such person is the person against whom such tax was assessed.
26 U.S.C. § 7421(a); see also Hibbs v. Winn, 542 U.S. 88, 102-03, 124 S.Ct. 2276, 159 L.Ed.2d 172 (2004). The AIA serves two purposes. "It responds to the Government's need to assess and collect taxes as expeditiously as possible with a minimum of preenforcement judicial interference; and it require[s] that the legal right to the disputed sums be determined in a suit for refund." Id. at 103, 124 S.Ct. 2276 (citations and internal quotations deleted).
A district court "must dismiss for lack of subject matter jurisdiction any suit that does not fall within one of the exceptions to the Anti-Injunction Act." Gardner v. U.S., 211 F.3d 1305, 1311 (D.C.Cir.2000). Although the Act contains a number of statutory exceptions, none of those exceptions is relied upon by Mr. Bennett. Compare 26 U.S.C. § 7421(a) (listing exceptions) with Compl. ¶ 7 (alleging numerous violations, none of which falls within the § 7421(a) exceptions). In addition to the statutory exceptions, the Supreme Court has recognized two judicial exceptions to the AIA: when the plaintiff has no "alternative legal way to challenge the validity of a tax," South Carolina v. Regan, 465 U.S. 367, 373, 104 S.Ct. 1107, 79 L.Ed.2d 372 (1984), and when "it is clear that under no circumstances could the Government ultimately prevail, . . . and . . . equity jurisdiction otherwise exists," Enochs v. Williams Packing & Navigation Co., 370 U.S. 1, 7, 82 S.Ct. 1125, 8 L.Ed.2d 292 (1962); see also Nat'l Taxpayers Union v. United States, 68 F.3d 1428, 1436 (D.C.Cir.1995) (quoting Younger v. Harris, 401 U.S. 37, 43-44, 91 S.Ct. 746, 27 L.Ed.2d 669 (1971) ("The basic doctrine of equity jurisprudence [is] that courts of equity should not act . . . when the moving party has an adequate remedy at law and will not suffer irreparable injury if denied equitable relief.")).
Mr. Bennett has invoked neither exception, nor could he successfully do so. He is ineligible for the South Carolina exception *42 because, as noted earlier, he can challenge the validity of the tax assessments by filing a refund claim. See South Carolina, 465 U.S. at 374-76, 104 S.Ct. 1107. The Williams Packing exception is unavailable for much the same reason  Mr. Bennett has an adequate legal remedy, in the form of a refund claim, to challenge any improper collection of taxes.[3] Accordingly, the Court will deny Mr. Bennett's request for an injunction.

III. CONCLUSION
For the foregoing reasons, the Court will grant the Government's motion to vacate the Clerk's entry of default [Dkt. # 8], will grant the Government's motion to dismiss [Dkt. # 9], and will deny Plaintiff's motion for judgment by default [Dkt. # 14]. A memorializing order accompanies this Memorandum Opinion.

ORDER
For the reasons stated in the Memorandum Opinion filed simultaneously with this Order, it is hereby
ORDERED that Defendant's motion to vacate the Clerk's entry of default [Dkt. # 8] is GRANTED; and it is
FURTHER ORDERED that Defendant's motion to dismiss [Dkt. # 9] is GRANTED; and it is
FURTHER ORDERED that Plaintiffs motion for judgment by default [Dkt. # 14] is DENIED; and it is
FURTHER ORDERED that this case is DISMISSED; accordingly, this case is closed.
This is a final appealable order. See Fed. R.App. P. 4(a).
SO ORDERED.
NOTES
[1]  The Government contends that failure to exhaust remedies under section 7433 is a jurisdictional defect, which requires the Court to dismiss for lack of subject matter jurisdiction under Fed.R.Civ.P. 12(b)(1). See Mot. to Dismiss at 4-6 (relying on McGuirl v. U.S., 360 F.Supp.2d 125, 128 (D.D.C.2004)). This Court does not find that failure to exhaust under section 7433 is a jurisdictional defect, but instead finds that is a nonjurisdictional defect. See Turner, 429 F.Supp.2d at 154 (exhaustion under section 7433 is nonjurisdictional because Congress did not expressly designate exhaustion under this statute as jurisdictional). "[W]hen Congress does not rank a statutory limitation on coverage as jurisdictional, courts should treat the restriction as nonjurisdictional in character." Id. (quoting Arbaugh v. Y & H Corp., 546 U.S. 1235, 126 S.Ct. 1235, 163 L.Ed.2d 1097 (2006)). Even though it is nonjurisdictional, exhaustion remains a necessary element of a claim under section 7433, and thus failure to exhaust constitutes failure to state a claim upon which relief may be granted.
[2]  On February 9, 2006, Mr. Bennett was indicted for one count of conspiracy to defraud the United States and five counts of attempts to evade or defeat the payment of federal taxes he owes. See U.S. v. Bennett, No. 06-CR-68 (D.Haw.) The indictment alleges that Mr. Bennett failed to pay approximately $2.4 million in self-employment income. Id., Indictment [Dkt. # 1].
[3]  Mr. Bennett has not shown that he will suffer irreparable harm if required to pay taxes in full before claiming a refund, see Nat'l Taxpayers Union, 68 F.3d at 1436, and he has failed to demonstrate that the Government could under no circumstances prevail here  for example, by adducing facts suggesting that the IRS has flouted the tax code or imposed taxes with no basis in fact. See Williams Packing, 370 U.S. at 7, 82 S.Ct. 1125; Investment Annuity v. Blumenthal, 609 F.2d 1, 5 (D.C.Cir.1979) (placing this burden on the plaintiff).
