The Metro Daily report in 2017 shows that most of the teachers who are the among the biggest number of professionals in Malaysia, do not pay zakat on their income, especially in the state of Kedah, as there are Islamic education options claimed for certain reasons. Based on this problem, this study was conducted to see the extent of understanding of zakat on income among Islamic Education teachers in the state of Kedah in order to determine whether they truly understand the matter or otherwise.The design of this study is based on quantitative approach using survey method (questionnaire form) with a sample of 141 respondents consisting of Islamic Education teachers in Kedah as well as interviews with the Deputy Chief Executive Officer, Dakwah and LZNK Collection Department. The results show that the level of understanding about zakat on income among Islamic education teachers where they understand about zakat on income but there are still a few of the respondents show a moderate and low level of understanding which means they have little or no understanding about zakat on income.