This article relates to the personal income tax relief, hereinafter referred to as the tax abolition relief, which has been applicable since 2008. On its implementation as well as during its further application, the tax abolition relief gave rise to numerous difficulties of interpretation. Consistently, the point of reference throughout the legislation process and the application of law has been the principle of tax fairness. This aspect has also been raised during the recent implementation of the amendments to this tax relief. The author analyses the origin justifying the tax abolition relief and its substance, considering the amendments that became binding since the beginning of 2021. The study material was based on the Polish legislation and doctrine and expanded by the aspects of international tax law.