diff --git a/Code/convert_bis_pos_tag_to_ilmt.py b/Code/convert_bis_pos_tag_to_ilmt.py
new file mode 100644
index 0000000000000000000000000000000000000000..9de0233ceaeb9276e949fab99f98a674bfb1ac52
--- /dev/null
+++ b/Code/convert_bis_pos_tag_to_ilmt.py
@@ -0,0 +1,97 @@
+from re import search
+from sys import argv
+
+
+def bis_to_ilmt_conversion(bis_pos_tag):
+    """Convert a BIS pos tag to ILMT pos tag."""
+    ilmt_tag = ''
+    bis_pos_tag = bis_pos_tag.replace('__', '_')
+    if bis_pos_tag == 'N_NNV':
+        ilmt_tag = 'VM'
+    elif search('N_(N.*)', bis_pos_tag):
+        print(search('N_(N.*)', bis_pos_tag))
+        ilmt_tag = search('N_(N.*)', bis_pos_tag).group(1)
+    elif bis_pos_tag == 'PR_PRQ':
+        ilmt_tag = 'WQ'
+    elif search('PR_PR.*', bis_pos_tag):
+        ilmt_tag = 'PRP'
+    elif search('DM_.*', bis_pos_tag):
+        ilmt_tag = 'DEM'
+    elif search('V_VM.*', bis_pos_tag):
+        ilmt_tag = 'VM'
+    elif bis_pos_tag == 'JJ':
+        ilmt_tag = 'JJ'
+    elif bis_pos_tag == 'RB':
+        ilmt_tag = 'RB'
+    elif bis_pos_tag == 'PSP':
+        ilmt_tag = 'PSP'
+    elif search('V_VAUX', bis_pos_tag):
+        ilmt_tag = 'VAUX'
+    elif bis_pos_tag == 'CC_CCS_UT':
+        ilmt_tag = 'UT'
+    elif search('CC.*', bis_pos_tag):
+        ilmt_tag = 'CC'
+    elif bis_pos_tag == 'RP_RPD':
+        ilmt_tag = 'RP'
+    elif search('RP_(.+)', bis_pos_tag):
+        ilmt_tag = search('RP_(.+)', bis_pos_tag).group(1)
+    elif search('QT.*', bis_pos_tag):
+        if bis_pos_tag[-1] == 'F':
+            ilmt_tag = 'QF'
+        elif bis_pos_tag[-1] == 'C':
+            ilmt_tag = 'QC'
+        elif bis_pos_tag[-1] == 'O':
+            ilmt_tag = 'QO'
+    elif bis_pos_tag in ['RD_PUNC', 'RD_SYM']:
+        ilmt_tag = 'SYM'
+    elif bis_pos_tag == 'RD_ECH':
+        ilmt_tag = 'ECH'
+    elif bis_pos_tag == 'RD_RDF':
+        ilmt_tag = 'FW'
+    elif bis_pos_tag == 'RD_UNK':
+        ilmt_tag = 'UNK'
+    if not ilmt_tag:
+        print('BLANK')
+        ilmt_tag = 'NN'
+    return ilmt_tag
+
+
+def read_lines_from_file(file_path):
+    """Read lines from a file."""
+    with open(file_path, 'r', encoding='utf-8') as file_read:
+        return file_read.readlines()
+
+
+def write_lines_into_file(lines, file_path):
+    """Write lines into a file."""
+    with open(file_path, 'w', encoding='utf-8') as file_write:
+        file_write.write('\n'.join(lines))
+
+
+def convert_pos_tags_from_bis_to_ilmt(lines):
+    """Convert BIS pos tags into ILMT tags."""
+    converted_lines = list()
+    for line in lines:
+        if line.strip():
+            line_split = line.strip().split('\t')
+            ilmt_tag = bis_to_ilmt_conversion(line_split[1])
+            if len(line_split) == 2:
+                converted_lines.append('\t'.join([line_split[0], ilmt_tag]))
+            else:
+                converted_lines.append('\t'.join([line_split[0], ilmt_tag, line_split[2]]))
+        else:
+            converted_lines.append(line.strip())
+    return converted_lines
+
+
+def main():
+    """Pass arguments and call functions here."""
+    input_file = argv[1]
+    output_file = argv[2]
+    input_lines = read_lines_from_file(input_file)
+    converted_lines = convert_pos_tags_from_bis_to_ilmt(input_lines)
+    write_lines_into_file(converted_lines, output_file)
+
+
+if __name__ == '__main__':
+    main()