letter rulingglossary / LETTER RULING letter ruling. Tax. A written statement issued by the IRS to an inquiring taxpayer, explaining the tax implications of a particular transaction. — Also termed private letter ruling. [Cases: Internal Revenue 3049.] 词条贡献者 译者张文,国际知名商学院金融专业,擅长翻译各种与结构性融资及衍生品诉讼相关的法律文件。