The Tax Structure of the Islamic State

The key revenue sources that we see in Islam are Zakat, Kharaj and Ushah. In the time of Omar Benel Khattab, he used to levy the wealthy in the society for denars of gold - a denar is 4.25 grams of gold,. And today that would be worth about 870 pounds. The non-Muslim Ahalbimma had a very good deal in the Islamic State when you consider they weren't paying 2.5% of their wealth over the Nisab value. They were paying a jizya. There's incentive for the farmers to do well because they obviously had to pay a Kharaj on the land but