The Wazir was the head of the Diwan-i-Wazarat and was responsible for the financial administration of the Delhi Sultanate.

The Diwan-i-Wazarat was responsible for the collection of taxes, disbursement of salaries, maintenance of accounts, and other financial matters of the Delhi Sultanate.

The Diwan-i-Wazarat collected various types of taxes, including land tax, trade tax, jizya (tax on non-Muslims), and other miscellaneous taxes.

Taxes were collected by the Diwan-i-Wazarat both directly from the taxpayers and through intermediaries, such as tax farmers.

Tax farming was a system in which the government granted the right to collect taxes to private individuals or companies, who were responsible for collecting the taxes and remitting them to the government.

The tax farming system had several advantages, including increased efficiency in tax collection, reduced cost of tax collection, and increased revenue for the government.

The tax farming system also had several disadvantages, including corruption and abuse of power by tax farmers, higher taxes for the taxpayers, and discouragement of investment and economic growth.

The Diwan-i-Wazarat disbursed salaries to government officials both directly from the treasury and through intermediaries, such as provincial governors.

The iqta system was a system of land grants made by the Sultan to his military commanders and other officials in lieu of salaries.

The iqta system had several benefits, including providing a source of income for military commanders and other officials, helping to maintain a loyal and efficient military force, and encouraging the development of agriculture and trade.

The iqta system also had several disadvantages, including the growth of a powerful and independent aristocracy, the exploitation of peasants, and the weakening of the central authority of the Sultan.

The Diwan-i-Wazarat maintained accounts through a system of written records, which included detailed records of revenue and expenditure.

The main sources of revenue for the Delhi Sultanate were land tax, trade tax, jizya, and other miscellaneous taxes.

The main items of expenditure for the Delhi Sultanate were salaries of government officials, military expenses, construction and maintenance of public works, and other miscellaneous expenses.

The Diwan-i-Wazarat played a vital role in the overall administration of the Delhi Sultanate by ensuring the smooth functioning of the financial system, providing financial support for the military and other government departments, and helping to maintain law and order.