KROUPA, Judge: This case ¹ is before the Court on respondent's motion to dismiss for lack of jurisdiction. We must decide whether the Court has jurisdiction to review respondent's whistleblower claim award determinations *107 where the whistleblower provided information both before and after the enactment of the Tax Relief and Health Care Act of 2006 (TRHCA)², Pub. L. No. 109-432, div. A, sec. 406, 120 Stat. at 2958, effective December 20, 2006. We hold that we do.³

The following background is drawn from the petition and respondent's motion to dismiss for lack of subject matter jurisdiction and responses filed by both parties. We note that the background is stated solely for purposes of ruling on the pending motion to dismiss and2014 Tax Ct. Memo LEXIS 107">*108 is not a finding of facts.

Petitioner is a whistleblower that reported a tax fraud scheme to the Government. During the whistleblower's employment, the whistleblower learned of a tax structure involving the whistleblower's employer and several related entities and subsidiary companies (targets). When the whistleblower raised concerns over the tax structure to the whistleblower's employer, the whistleblower's employer used physical force and armed men to intimidate the *108 whistleblower and prevent disclosure. Additionally, the employer removed almost all documents and records from the whistleblower's office. The whistleblower, however, kept comprehensive backups of all office records.

In October 2006 the whistleblower met with Internal Revenue Service (IRS) and Department of Justice (DOJ) representatives and provided them with information about the targets' failure to pay tax and other conduct. Subsequently, the whistleblower again met with the DOJ representatives and discussed the targets' potential terrorist financing activity. A grand jury investigation was convened on the basis of the whistleblower's information.^{42014 Tax Ct. Memo LEXIS 107">*109}

The whistleblower continued to provide additional information regarding the targets' activities and was in regular contact with the IRS and the DOJ representatives after December 20, 2006. The IRS and the DOJ representatives repeatedly contacted the whistleblower seeking additional information and analysis regarding the targets' transactions. On each occasion, the whistleblower provided the requested information and analysis. In 2007 the whistleblower testified before a grand jury on the basis of information the whistleblower acquired *109 after December 20, 2006.⁵ The whistleblower provided information to the IRS and the DOJ representatives continually until July 2009.^{62014 Tax Ct. Memo LEXIS 107">*110} Notably, the whistleblower's assistance in this investigation jeopardized the safety of the whistleblower and the whistleblower's family. As discussed in detail in Whistleblower 10949-13W v. Commissioner, T.C. Memo. 2014-94, the whistleblower received a death threat from the targets.

The whistleblower filed a Form 211, Application for Award for Original Information in 2011 and submitted to the IRS Whistleblower Office (Whistleblower Office) documentary evidence related to the targets' actions that the whistleblower had previously disclosed. Shortly thereafter, the Government entered into a Non-Prosecution Agreement with one of the targets that led to the Government recovering more than $30 million in taxes, penalties and interest. The Whistleblower Office granted the whistleblower a discretionary award *110 determination under section 7623(a) and denied the whistleblower's request for an award under section 7623(b).

The whistleblower timely filed the petition seeking review of respondent's award determination. Respondent filed a motion to dismiss for lack of jurisdiction on the ground that respondent's award determination is not subject to judicial review. Respondent argues that this Court lacks jurisdiction to review respondent's award determination2014 Tax Ct. Memo LEXIS 107">*111 because he proceeded against the targets using information the whistleblower provided before the effective date of section 7623(b),⁷ December 20, 2006.⁸ The whistleblower objected to the motion, asserting that the whistleblower is entitled to judicial review of respondent's award determination because the whistleblower provided information both before and after the effective date of section 7623(b). We agree with the whistleblower. We leave for another day whether the whistleblower is entitled to a larger award.

We must decide whether the Court has jurisdiction to review respondent's whistleblower claim award determination where the claim is based on information the whistleblower provided both before and after the enactment of TRHCA sec. 406, 120 Stat. at 2958.⁹¹⁰

We begin with the Tax Court's jurisdiction. The Tax Court is a court of2014 Tax Ct. Memo LEXIS 107">*112 limited jurisdiction and may exercise jurisdiction only to the extent authorized by Congress. Judge v. Commissioner, 88 T.C. 1175">88 T.C. 1175, 88 T.C. 1175">1180-1181 (1987); Naftel v. Commissioner, 85 T.C. 527">85 T.C. 527, 85 T.C. 527">529 (1985). The Tax Court is without authority to enlarge upon that statutory grant. See Phillips Petroleum Co. v. Commissioner, 92 T.C. 885">92 T.C. 885, 92 T.C. 885">888 (1989). We nevertheless have jurisdiction to determine whether we have jurisdiction. Hambrick v. Commissioner, 118 T.C. 348">118 T.C. 348 (2002); Pyo v. Commissioner, 83 T.C. 626">83 T.C. 626, 83 T.C. 626">632 (1984); Kluger v. Commissioner, 83 T.C. 309">83 T.C. 309, 83 T.C. 309">314 (1984).

*112 Our Rules are silent as to deciding a motion to dismiss for lack of subject matter jurisdiction. Thus, we look to the Federal Rules of Civil Procedure. See Rule (1)(b); Estate of Miller v. Commissioner, T.C. Memo. 1994-25. When deciding a motion to dismiss based on lack of subject matter jurisdiction, a court must construe the undisputed allegations of the complaint in a manner favorable to the plaintiff. See Dacosta v. United States, 82 Fed. Cl. 549">82 Fed. Cl. 549, 82 Fed. Cl. 549">552 (2008). Where jurisdiction turns on contested facts, allegations in the petition are generally taken as true for purposes of deciding a motion to dismiss for lack of jurisdiction. See, e.g., O'Brien v. Commissioner, 40 B.T.A. 280">40 B.T.A. 280 (1939). The issue is whether the claimant is entitled to offer evidence to support the claims, not whether the claimant will ultimately prevail on the merits. See Scheuer v. Rhodes, 416 U.S. 232">416 U.S. 232, 416 U.S. 232">236 (1974); see also Reynolds v. Army and Air Force Exch. Serv., 846 F.2d 746">846 F.2d 746, 846 F.2d 746">747 (Fed. Cir. 1988). We turn now to an overview of our jurisdiction regarding whistleblower claims.

The Secretary has long had the discretion to pay awards to persons providing information that aids in (1) detecting underpayments of tax and (2) detecting2014 Tax Ct. Memo LEXIS 107">*113 and bringing to trial and punishment persons guilty of violating the internal revenue laws. Sec. 7623(a). The discretionary whistleblower awards have been arbitrary and inconsistent, however, because of a lack of standardized *113 procedures and limited managerial oversight. See Treasury Inspector General for Tax Administration Report 2006-30-092, The Informants' Rewards Program Needs More Centralized Management Oversight (June 2006). It took an average of seven years for a discretionary award to be paid and an average of six months for a claim to be rejected. Id. at 8-9. Moreover, most rejected claims did not provide the rationale for the reviewer's decision because of concerns about disclosing confidential return information to the whistleblower. Id. at 7.

Congress enacted TRHCA in 2006 to address perceived problems with the discretionary award regime. TRHCA sec. 406(a), 120 Stat. at 2958, amended section 7623 to require the Secretary to pay nondiscretionary whistleblower awards under certain circumstances and to provide this Court with jurisdiction to review such award determinations. A whistleblower is now entitled to a minimum nondiscretionary award of 15% of the collected proceeds if the Commissioner proceeds with administrative or judicial action using2014 Tax Ct. Memo LEXIS 107">*114 information provided in a whistleblower claim.¹¹Sec. 7623(b)(1).

*114 TRHCA also directed the Secretary to issue guidance for the operation of a Whistleblower Office administered by the IRS.¹² TRHCA sec. 406(b)(1), 120 Stat. at 2959. The Whistleblower Office is responsible for reviewing submitted whistleblower claims or assigning them to the appropriate IRS office for review. Id.sec. 406(b)(1)(B), 120 Stat. at 2960. The Whistleblower Office is authorized to seek additional assistance from the whistleblower if necessary. Id.sec. 406(b)(1)(C), (2).

The Commissioner released guidance to taxpayers on filing nondiscretionary whistleblower award claims in early 2008. SeeNotice 2008-4, 2008-1 C.B. 253. Whistleblowers seeking an award must fully complete2014 Tax Ct. Memo LEXIS 107">*115 and submit a Form 211. Id.sec. 3.02, 2008-1 C.B. at 254. The Whistleblower Office will acknowledge receipt of the claim in writing. Id.sec. 3.05, 2008-1 C.B. at 255. The Whistleblower Office will send correspondence to the whistleblower once a determination regarding the claim has been made. Id.sec. 3.11, 2008-1 C.B. at 256. Whistleblower Office determinations regarding awards may be appealed to this Court within 30 days from the issuance of the nondiscretionary award determination. Id.; see alsosec. 7623(b)(4). Awards will not be paid, however, *115 until there is a determination of the tax liability and the amounts owed are collected. Notice 2008-4, sec. 3.08, 2008-1 C.B. at 255. The Commissioner also issued procedural guidance on how whistleblower claims will be processed. See Internal Revenue Manual (IRM) pt. 25.2.2 (Dec. 30, 2008).^{132014 Tax Ct. Memo LEXIS 107">*116} In general, whistleblower claims will be denied where the information provided does not: (a) identify a Federal tax issue upon which the IRS will act; (b) result in the detection of an underpayment of tax; or (c) result in the collection of proceeds. See id. pt. 25.2.2.12(2) (June 18, 2010). The whistleblower will be notified by the Whistleblower Office once an award decision has been made. See id. pt. 25.2.2.5(13) (Dec. 30, 2008).

We must now decide whether the Court has jurisdiction to review respondent's award determination. Respondent argues that this Court does not have jurisdiction to review his award determination because the whistleblower provided the information to the Whistleblower Office before the enactment of section 7623(b). See Wolf v. Commissioner, T.C. Memo. 2007-133 (holding that the Court lacked jurisdiction to review a determination regarding a whistleblower *116 award because the information was provided before December 20, 2006). Thus, respondent argues that this Court lacks jurisdiction to review his award determination because he proceeded against the targets using information the whistleblower provided before December 20, 2006. The whistleblower argues that this Court has jurisdiction to review respondent's award determination because the whistleblower alleged that respondent proceeded against the targets using information the whistleblower provided both before and after December 20, 2006. Seesec. 7623(b).

We hold that the whistleblower satisfied the whistleblower's pleading burden by alleging facts that respondent proceeded with an action against the2014 Tax Ct. Memo LEXIS 107">*117 targets using information brought to respondent's attention by the whistleblower both before and after December 20, 2006. This is consistent with TRHCA's intent to provide whistleblowers with judicial review of award determinations. We now turn to the governing law.

A whistleblower who satisfies the requirements of section 7623(b) is entitled to receive at least 15% but no more than 30% of the collected proceeds or from a settlement with the taxpayer. Additionally, the Commissioner must *117 proceed ¹⁴ with an administrative or judicial action based on information brought to the Commissioner's attention by the whistleblower. Seesec. 7623(b)(1). The IRM states that action by the IRS includes the modification of a pending or planned examination or investigation as a result of information provided by the whistleblower. IRM pt. 25.2.2 (June 18, 2010).

Additionally, the Tax Court has exclusive2014 Tax Ct. Memo LEXIS 107">*118 jurisdiction over appeals of award determinations where a whistleblower provided information both before and after the effective date of TRHCA. See, e.g., Dacosta, 82 Fed. Cl. 549">82 Fed. Cl. at 554 (determining that the Tax Court had exclusive jurisdiction over the whistleblower's claim). The Court of Federal Claims' decision in Dacosta is directly on point. In Dacosta the court dismissed the case because the court found that the Tax Court had exclusive jurisdiction over the whistleblower claim and the court could not transfer the case to the Tax Court. Id. at 557 (referencing 28 U.S.C. sec. 1631). Nevertheless, the Dacosta court's analysis and rationale are persuasive. In Dacosta, as here, the claimants provided the Commissioner with information both before and after the enactment of TRHCA. Id. at 551. The Government moved to dismiss for lack of *118 subject matter jurisdiction and argued that the information submitted by the claimants in 2007 was identical to the information submitted in 2003. 82 Fed. Cl. 549">Id. at 553. The Government further argued that, even if the claimants provided new and different information, the Commissioner did not proceed using the later application and documents. Id. The court rejected the Government's arguments and determined that the claimants alleged sufficient2014 Tax Ct. Memo LEXIS 107">*119 facts to avail themselves of section 7623(b)(1) for jurisdictional purposes. 82 Fed. Cl. 549">Id. at 554. The court concluded that the claimants' alleged facts, if proven at trial, would establish that the Commissioner acted on information provided by the claimants after the amendments to section 7623. Id.

The parties dispute whether respondent proceeded against the targets using the whistleblower's post-December 20, 2006, information. The whistleblower's allegations are sufficient to establish jurisdiction. The whistleblower alleged that the whistleblower provided the IRS and the DOJ with information from at least October 2006 through July 2009. The post-December 2006 information was not simply confirmatory details. Rather, the whistleblower provided the IRS and the DOJ with the facts that formed the basis and gravamen of respondent's action against the targets. The whistleblower alleged that the whistleblower provided the *119 IRS and the DOJ with the identity of documents, wire transfers, disbursement authorizations, individuals and entities involved in the transactions.

Taking the contested factual allegations in the petition as true, they establish that from October 2006 through July 2009 the whistleblower was in constant contact with the2014 Tax Ct. Memo LEXIS 107">*120 IRS and the DOJ and provided them with the basis of and details on the targets' tax avoidance scheme. Whether respondent used this information to proceed against the targets is not a question for the present motion. The whistleblower has alleged sufficient jurisdictional facts to avail the whistleblower of section 7623(b)(1) for jurisdictional purposes and to overcome a motion to dismiss for lack of jurisdiction. If the whistleblower's alleged facts are proved at trial, they would establish that respondent proceeded against the targets using information the whistleblower provided after December 20, 2006. If these facts are established, the whistleblower is entitled to judicial review of respondent's award determination.

We hold, consistent with the rationale of Dacosta, that this Court has jurisdiction to review an award determination where a whistleblower has alleged that the whistleblower provided information both before and after the enactment of section 7623(b).

*120 We have considered all remaining arguments the parties made and, to the extent not addressed, we conclude they are irrelevant, moot or meritless.

For the foregoing reasons, we shall deny respondent's motion to dismiss.

An appropriate order will be issued2014 Tax Ct. Memo LEXIS 107">*121 .