Writing is a way of communicating with one another, it is essential that students should be competent in sentence structure, vocabulary, grammar, and correct usage in able to successful in communication. If someone failed to do so, then he will likely make a wrong impression. Thus, it is important for teachers to create innovative tasks that include the students’ interest to improve their writing competence. The purpose of this study is to carry out a comprehensive study in order to assess the effectiveness of utilization of task-based learning in teaching and the writing skills of Senior High School students at Tanauan Institute Inc. The respondents were chosen in a non-random way, assigning forty (40) Grade 11 students at Tanauan Institute, Inc. who are taking Creative Non-Fiction subject during the academic year 2023-2024. The researcher utilized the one group pre-test post-test research design in order to determine the respondents’ writing competence in terms of sentence structure, vocabulary, grammar and correct usage. The pre-test was conducted before accomplishing the blogging task while the post-test was done after the intervention was exposed to the respondents. The study revealed that there is a significant difference between the mean pre-test and post-test scores of the respondents in terms of vocabulary and correct usage which imply that the task-based activity can improve the respondents’ writing competence.