California Code, Unemployment Insurance Code - UIC § 1958

No cost shall be awarded in hearings on appeal by the Appeals Board, but if in the opinion of the Appeals Board, the claimant or an employer has acted in bad faith and without reasonable basis for appeal, a penalty not exceeding 10 percent of the amount finally awarded on the appeal may be taxed against and deducted from the award by the Appeals Board and shall be placed in the Unemployment Fund. In those cases where a penalty is assessed against an employer his account, as maintained under this act, shall be debited with the amount of the penalty so assessed.