Abstrak
This study aims to find the types of grammatical errors that students make in writing recount text, the types of errors that students make most often, and the sources of these errors. The researcher used a qualitative-descriptive design. The research subjects were 21 students of class IX-1 at SMP Negeri 10 Tarakan. The researcher used writing tests and interviews to collect data. The results showed that students made grammatical errors in all categories based on Surface Strategy Taxonomy (Dulay, 1982). The first category was formation error which is the highest type of error made by students with 65 errors or (82%). The second category was omission which consisted of 7 errors (9%). The third type of errors was arrangement errors with 6 errors (8%). Addition is the lowest error type with only 1 error (1%). The sources of errors that affect students in making errors were interlingual transfer and intralingual transfer. The intralingual transfer was the highest frequency, with 66 errors (84%). Interlingual transfer was the second source of errors with 3 errors (16%).