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 资深译员Gianluca,毕业于亚洲顶尖的高级翻译学院,专注翻译各种与清洁与可再生能源有关的法律文件。