Some figures:

Kenya applies the EAC Customs Union’s Common External Tariff (CET), which includes three tariff bands: zero duty for raw materials and inputs; 10 percent for processed or manufactured inputs; and 25 percent for finished products. “Sensitive” products and commodities, comprising 58 tariff lines, have applied ad valorem rates above 25 percent.  This includes a 60 percent rate for most milk products, 50 percent for corn and corn flour, 75 percent for rice, 35 percent for wheat, and 60 percent for wheat flour. For some products and commodities, the tariffs vary across the five EAC member states.

The report touches a number of other issues, including non-tariff barriers, custom procedures at the Port of Mombasa, intellectual property right protection and many other things. An interesting bit on counterfeiting:

According to a survey released by the Kenya Association of Manufacturers (KAM) in April 2012, the Kenyan economy is losing at least $433 million annually due to counterfeiting. The study estimated that the GOK is losing approximately $72 million in potential tax revenue, and that some Kenyan companies could be losing as much as 65 percent to 70 percent of their regional market share due to counterfeiting.

Kenya’s EPZs have served as a conduit for counterfeit and sub-standard goods. These products enter the EPZ ostensibly as sub-assembly or raw materials, but are actually finished products. These counterfeit and sub-standard goods also end up in the Kenyan marketplace without responsible parties paying the necessary taxes. Counterfeit batteries have been particularly problematic.

More here