This research aimed at analysing the errors commonly made by the students at English Education Department of UMY batch 2012 in the use of passive voice. Quantitative approach was applied in conducting the research. The researcher carried out the survey research design in conducting this research. The samples of the research were 20% of 100 total students or 20 students. The descriptive analysis method was used in this research to portray the errors of the students and to analyse the data by utilizing the formula P =𝐹 𝑁 x 100%. The instrument of the research was test related to passive voice which focused on several tenses; such as simple present, present continuous, present perfect, simple past, past continuous, past perfect, simple future (including ‘be going to’ form), and modals. All of these tenses were used in the affirmative sentence only. The researcher only emphasized on the misformation which categorizing the wrong form of the structure or morpheme used. The finding showed that there were 667 errors with the highest error was ‘Be’ (182 errors or 27.29%). There were 5 out of 8 tenses which have the same highest error, they were ‘Be’ which belonged to present continuous, present perfect, simple past, past continuous, and past perfect. Eventually, tense with the highest total error belonged to simple past tense