This study was aimed to investigate the compatibility and the extent of materials in the developed English textbook “My Next Word” for Elementary School 5 based on Kurikulum Merdeka with Tomlinson's (2011) sixteen suggested criteria for developing coursebook material. This research uses a qualitative approach and conducted by using a content analysis design. The data is collected from an English textbook entitled “My Next Word” for Elementary School 5 Published in 2021 by Indonesian Ministry of Education and Culture. The writer uses all available chapters provided by the textbook. The result of this research shows that the English textbook “My Next Word” for Elementary School 5 fulfill all of the sixteen criteria and 93,8% of the content is compatible with Tomlinson’s 2011 criteria. Teachers may consider the results of the research for using “My Next Word” for Elementary School 5 as learning materials but it does not rule out the possibility of the use of other textbook for additional supporting material.