diff --git a/toggl2sheets.py b/toggl2sheets.py
index 3d4e2f0..87033e2 100644
--- a/toggl2sheets.py
+++ b/toggl2sheets.py
@@ -70,14 +70,14 @@ today = datetime.datetime.now().date() - datetime.timedelta(days=1)
 
 
 def append_hours(worksheet: Worksheet, data: List[List[str]]):
-    # add a calculated hours * wage cell to all rows
-    # start at number 2 to skip header
-    d = [[*x, f"=C{i}*D{i}"] for i, x in enumerate(data, start=2)]
     column = worksheet.get_col(1)
 
     # get last non-empty row
     last_row = next(filter(lambda x: not x[1], enumerate(column)))[0]
 
+    # add a calculated hours * wage cell to all rows
+    d = [[*x, f"=C{i}*D{i}"] for i, x in enumerate(data, start=last_row + 1)]
+
     worksheet.insert_rows(last_row, len(d), d)
 
     # inserting rows changes the top sums