Rizal Commercial Banking Corporation v. Commissioner of Internal Revenue

Summary

RCBC challenged BIR's deficiency tax assessments for 1994-1995, questioning the validity of statute of limitations waivers and its liability for FCDU onshore withholding tax. The Supreme Court applied estoppel doctrine, ruling that RCBC's partial payment of the revised assessments prevented it from later challenging the waiver validity. The Court distinguished between withholding agents (mere tax collectors) and taxpayers (actual income earners liable for tax), holding RCBC liable as the taxpayer who earned income from foreign currency transactions. The decision reinforced the specialized expertise of tax courts and upheld the P80.16 million deficiency assessment plus penalties, emphasizing that taxpayers cannot escape liability by shifting blame to withholding agents.