diff --git a/taxcalc/records.py b/taxcalc/records.py
index 4da7ef623..a5b80ef08 100644
--- a/taxcalc/records.py
+++ b/taxcalc/records.py
@@ -350,7 +350,7 @@ def _adjust(self, year):
         # pylint: disable=no-member
         if self.ADJ.size > 0:
             # Interest income
-            self.e00300 *= self.ADJ['INT{}'.format(year)][self.agi_bin].values
+            self.e00300 *= self.ADJ[f'INT{year}'].iloc[self.agi_bin].values
 
     def _read_ratios(self, ratios):
         """