Question Summary:
Is selling on installments permissible?

Question Detail:

Is it permissible to sell by installments when the price of the product is increased?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
It is permissible to sell products on installments on condition the final price of the product is agreed upon at the time of sale. [1]
 
And Allah Ta’āla Knows Best
Abdul Hannan Nizami,
Student Darul Iftaa
Chicago, USA
Checked and Approved by,
Mufti Ebrahim Desai.