The rate of inflation will not be considered when paying missed Zakat.
Inflation is not considered in Shariah based upon the following narration:
Abu Sa’id al-Khudri and Abu Huraira (Allah be pleased with them) narrate that the Messenger of Allah (Allah bless him & give him peace) appointed a person as a governor of Khaybar. This governor brought to the Prophet (Allah bless him & give him peace) high quality dates of Khaybar. The Messenger of Allah (Allah be pleased with them) asked: “Are all the dates of Khaybar like this?” He replied: “By Allah, no, O Messenger of Allah! We barter one measures (sa`) of this type of dates for two measures (sa`) of our own (normal & inferior quality) dates, and two measures (sa`)’s for three of ours. The Messenger of Allah said: “Do not do so (as this will be considered usury). Rather, sell the dates of inferior quality, and then buy the good quality dates with that money.” (Recorded by Imam al-Bukhari and Imam Muslim)
The Islamic jurists and Hadith commentators have explained that the above narration is clear evidence on the fact that when dealing in usurious goods, the similarity which is required is in quantity or equal units and not merely value. Therefore, one has to pay identical amount for missed Zakat in terms of units and numbers not value.
And Allah knows best!
Reviewed on 29/11/2021