Legal calculators often embody a characteristic that can be termed “simplexity.” As we have theorized, simplexity occurs when the government presents clear and simple explanations of the law without highlighting its underlying complexity or reducing this complexity through formal legal changes. In earlier work, we have argued that some elements of IRS publications (plain language summaries of the law for the general public) present contested tax law as clear tax rules, add administrative gloss to the tax law, and fail to fully explain the tax law. In this Article, we show that simplexity also occurs when the government offers legal calculators to deliver guidance to taxpayers. For example, depending on the individual taxpayer’s circumstance...