Must I Pay an Additional Cost After a Business Transaction Has Been Completed?

Answered by Shaykh Yusuf Weltch

Question

I negotiated a drink price with a vendor for 50 INR, but after I drank it, he asked for an additional 10 INR, saying I could pay it later. Do I owe him the 10 INR?

Answer

In the Name of Allah, the Most Merciful and Compassionate

Once a business transaction has been completed via the transferal of the price and the item of sale is taken possession of, such a transaction cannot be added to by either party.

This is because when the conditions of the sale are met, ownership of the item of sale and the right to the price transfer to the other party. [Maydani, al-Lubab fi Sharh al-Kitab]

That said, it is not rightful for him to ask you for additional money. Forcing you to give that money is sinful as it is misappropriating wealth (ghasb).

Hope this helps
Allah knows best
[Shaykh] Yusuf Weltch
Checked and Approved by Shaykh Faraz Rabbani

Shaykh Yusuf Weltch teaches Arabic, Islamic law, and spirituality. After accepting Islam in 2008, he completed four years at the Darul Uloom Seminary in New York, where he studied Arabic and the traditional sciences.

He then traveled to Tarim, Yemen, where he studied for three years in Dar al-Mustafa under some of the most outstanding scholars of our time, including Habib Umar Bin Hafiz, Habib Kadhim al-Saqqaf, and Shaykh Umar al-Khatib.

In Tarim, Shaykh Yusuf completed the memorization of the Quran and studied beliefs, legal methodology, hadith methodology, Quranic exegesis, Islamic history, and several texts on spirituality. He joined the SeekersGuidance faculty in the summer of 2019.