The rule of BFP v. Resolution Trust Corp. (1994) 114 S.Ct. 1757 applies to tax sales conducted under California law.  The price received at a properly conducted tax sale is “reasonably equivalent value” and thus the sale cannot be set aside as a fraudulent transfer in bankruptcy under 11 USC 548.

Ninth Circuit Court of Appeals (Clifton, J.); September 8, 2016; 2016 WL 4698300