Several factors were responsible for the decline of the Mughal empire. In this context

(a). There were four groups of nobles in the Mughal court- Iranis, Turanis, Afghans and Hindustanis. The Iranis hailed from Persia, the Turanis hailed from Transoxiana, and the Afghans came from the mountainous border regions across the river Indus. The Mughal court was a house sharply divided from within. This resulted in a constant struggle for power among these groups. Their mutual jealousies and rivalries caused great harm to the Mughal administration and undermined the prestige and authority of the Mughal emperor. 

(b) The Mughal officers were given jagirs as payment for their services. Towards the end of the 17th century, there were very few jagirs left. To satisfy the demands of the newly recruited officers, crown lands were converted to jagir lands and given to the nobles. This led to a loss of revenue for the royal treasury and a further decline in the power of the emperor. 

(c) After the death of a Mughal ruler, generally there were wars of succession among rival claimants to the throne. These wars proved very costly and destructive. They drained the resources of the empire and made it instable and weak.