MEMORANDUM Norman Douglas Diamond appeals pro se from the district court’s judgment dismissing his damages action under 26 U.S.C. § 7433 arising from various interactions with defendant involving his federal income taxes. We have jurisdiction under 28 U.S.C. § 1291. We review de novo a dismissal for lack of subject matter jurisdiction. Harger v. Dep’t of Labor, 569 F.3d 898, 903 (9th Cir. 2009). We affirm. The district court properly dismissed Diamond’s action without prejudice for lack of subject matter jurisdiction because Diamond failed to show his claims fell within a waiver of sovereign immunity.

See Holloman v. Watt, 708 F.2d 1399, 1401 (9th Cir. 1983) (waiver of sovereign immunity “must be unequivocally expressed,” and “[t]he party who sues the United States bears the burden of pointing to such an unequivocal waiver of immunity” (citation and internal quotation marks omitted)); Miller v. United States, 66 F.3d 220, 222-23 (9th Cir. 1995) (waiver of sovereign immunity under § 7433 permitting taxpayers to sue for misconduct in collection of taxes does not extend to improper determination or assessment of taxpayer’s liabilities); see also Shwarz v.

United States, 234 F.3d 428, 433 (9th Cir. 2000) (“Section 7433 creates a private right of action only for tax collection activity that violates some provision of the Revenue Code or the regulations promulgated thereunder.”). We reject as meritless Diamond’s contentions that he was improperly denied discovery and injunctive relief, We do not consider matters not specifically and distinctly raised and argued in the opening brief, or arguments, allegations, or evidence raised for the first time on appeal. See Padgett v. Wright, 587 F.3d 983, 985 n.2 (9th Cir. 2009); Kirshner v.

Uniden Corp. of Am., 842 F.2d 1074, 1077 (9th Cir. 1988). Diamond’s motions for leave .to file supplemental briefs (Docket Entry Nos. 39, 41) are granted. The Clerk shall file the supplemental briefs (Docket Entry Nos, 40, 42). All other pending motions and requests (Docket Entry Nos. 2, 6) are denied. AFFIRMED. This disposition is not appropriate for publication and is not precedent except as provided by Ninth Circuit Rule 36-3.