Abstract: This study aimed at examining the contribution of iTax system as a strategy for revenue collection at Kenya Revenue Authority, Rift Valley Region, Kenya. The study was guided by the following hypothesis: Ha1:There is a contribution of online taxpayer registration on revenue collection at KRA Rift Valley Region ;Ha2: There is a contribution of online tax return processing on revenue collection at KRA Rift Valley Region ; Ha3: There is a contribution of online compliance and monitoring activities on revenue collection at KRA Rift Valley Region.; Ha4: There is a contribution of electronic tax payments on revenue collection at KRA Rift Valley Region.The study was guided by Resource Based Theory. The study employed correlational research design. The target population was the domestic taxes department employees at KRA Rift Valley Region.