As the elements which are inherently polyfunctional and used to construct and mediate addressor- addressee interactions, metadiscourse features have always been an intriguing line of research in spoken and written discourse. Taken this into consideration, this study was an effort to investigate, quantitatively and qualitatively the function (s), underspecification and translation(s) of five most prevalent metadiscourse features in an English-Persian parallel corpus. To this end, a fine-grained parallel corpus of law and political texts was created to analyze the designated metadiscourse features. The analysis of the parallel concordance lines demonstrated that functional translation of the metadiscourse features was the leading translation strategy in Persian language. Apart from that, there were degrees of underspecifications including omission and extension of metadiscourse features. However, the analysis of parallel concordance lines illustrated that the function(s) of metadiscourse features did not change from the source language into the target language, as they were found to be context dependent. The results of this study can have implications for semantics, pragmatics, translation studies and corpus linguistics.