MEMORANDUM **

Richard James Basuel appeals from his jury-trial conviction for conspiracy, in vio*695lation of 18 U.S.C. § 371, and multiple counts of aiding and abetting the filing of false tax returns, in violation of 26 U.S.C. § 7206(2). We have jurisdiction under 28 U.S.C. § 1291, and we affirm.

Basuel challenges the sufficiency of the evidence supporting his convictions. Because he preserved this claim in the district court by filing a motion for acquittal, we review de novo his challenge to the sufficiency of the evidence claim. See United States v. George, 420 F.3d 991, 998-99 (9th Cir. 2005).

Basuel contends the government failed to provide evidence showing he willfully aided in preparing false returns, as required by 26 U.S.C. § 7206(2). Willfulness may be established “with circumstantial evidence indicating that the defendant knew or must have known that his returns were false.” United States v. Tucker, 133 F.3d 1208, 1218 (9th Cir. 1998) (internal quotation marks and citation omitted). There was evidence that Basuel had many years’ experience in the tax preparation business prior to his use of the supposed foreign-income loophole, that he supposedly relied on others with no demonstrable tax experience to interpret the tax code language, and that he continued to file returns using the suspect method even after many clients’ returns had been rejected by the Internal Revenue Service.

Considering the evidence in the light most favorable to the prosecution, a rational trier of fact could infer from the government’s evidence that Basuel willfully assisted in the filing of returns he knew were false. See George, 420 F.3d at 999.

AFFIRMED.