How the individual differences prime different learning process is well addressed in literature. But, what is missing from these analyses is how learners with different identity styles approach reading and writing skills and if different identity styles can predict differentiated language performance. The present study aims at investigating the relationship between identity styles, and reading/writing skills of Iranian intermediate female EFL learners. One the basis of the results of Nelson language proficiency test, 120 participants were selected to participate in this research. Participants' answers to Berzonsky's Identity Style Inventory (ISI3) and reading and writing parts of Preliminary English Test were analyzed. The results indicated that informational and normative identity styles were found to be positively correlated and diffuse-avoidant style was negatively correlated with reading and writing abilities whereas commitment identity didn't bear any significant relationships. The findings also indicated that informational style acted as the best predictor of these skills. Implications for language teachers are suggested.