You are the retained tax counsel of ABC Corp. Your client informed you that they have been directly approached with a proposal by a BIR insider (i.e., a middle rank BIR official) on the tax matter they have referred to you for handling. The BIR insider's proposal is to settle the matter by significantly reducing the assessment, but he will get 50% of the savings arising from the reduced assessment. What tax, criminal and ethical considerations will you take into account in giving your advice? Explain the relevance of each of these considerations.