More than 15,000 teachers are set to be promoted by the Teachers Service Commission(TSC) after students complete their national examinations.
This is after the commission announced the promotion that will cost Kes 1.4 billion.
Further, TSC CEO Nancy Macharia told MPs Tuesday that the compressed school calendar affected the process.
"Immediately after exams come to an end, we shall advertise and start the process of promoting the teachers to different grades," Macharia said.
Macharia clarified that the vacant positions were caused by natural attrition.
The MPs had questioned why most teachers have been in the same job group for more than ten years.
The committee chair Julius Melly inquired how much it would cost TSC to promote teachers.
"There is an outcry that promotion is based on nepotism and other corruption matters. And this seems to be affecting most teachers who have been serving in the same position," Melly said.
Macharia responded by saying the promotions are always based on merit and subject to availability.
