diff --git a/beancount_reds_importers/importers/workday/__init__.py b/beancount_reds_importers/importers/workday/__init__.py
index ff06c3f..e8c4261 100644
--- a/beancount_reds_importers/importers/workday/__init__.py
+++ b/beancount_reds_importers/importers/workday/__init__.py
@@ -50,6 +50,3 @@ def valid_header_label(label):
             for header in table.header():
                 table = table.rename(header, valid_header_label(header))
             self.alltables[section] = table
-
-    def build_metadata(self, file, metatype=None, data={}):
-        return {"filing_account": self.config["main_account"]}
diff --git a/beancount_reds_importers/libtransactionbuilder/banking.py b/beancount_reds_importers/libtransactionbuilder/banking.py
index abddbca..b4816b9 100644
--- a/beancount_reds_importers/libtransactionbuilder/banking.py
+++ b/beancount_reds_importers/libtransactionbuilder/banking.py
@@ -43,12 +43,6 @@ def build_account_map(self):
         # }
         pass
 
-    def build_metadata(self, file, metatype=None, data={}):
-        """This method is for importers to override. The overridden method can
-        look at the metatype ('transaction', 'balance', 'account', 'commodity', etc.)
-        and the data dictionary to return additional metadata"""
-        return {}
-
     def match_account_number(self, file_account, config_account):
         return file_account.endswith(config_account)
 
diff --git a/beancount_reds_importers/libtransactionbuilder/investments.py b/beancount_reds_importers/libtransactionbuilder/investments.py
index 7dca20d..d66d7b5 100644
--- a/beancount_reds_importers/libtransactionbuilder/investments.py
+++ b/beancount_reds_importers/libtransactionbuilder/investments.py
@@ -141,12 +141,6 @@ def build_account_map(self):
             )
             # fmt: on
 
-    def build_metadata(self, file, metatype=None, data={}):
-        """This method is for importers to override. The overridden method can
-        look at the metatype ('transaction', 'balance', 'account', 'commodity', etc.)
-        and the data dictionary to return additional metadata"""
-        return {}
-
     def custom_init(self):
         if not self.custom_init_run:
             self.max_rounding_error = 0.04
diff --git a/beancount_reds_importers/libtransactionbuilder/paycheck.py b/beancount_reds_importers/libtransactionbuilder/paycheck.py
index b487b07..a7f26ea 100644
--- a/beancount_reds_importers/libtransactionbuilder/paycheck.py
+++ b/beancount_reds_importers/libtransactionbuilder/paycheck.py
@@ -131,12 +131,6 @@ def build_postings(self, entry):
         newentry = entry._replace(postings=postings)
         return newentry
 
-    def build_metadata(self, file, metatype=None, data={}):
-        """This method is for importers to override. The overridden method can
-        look at the metatype ('transaction', 'balance', 'account', 'commodity', etc.)
-        and the data dictionary to return additional metadata"""
-        return {}
-
     def extract(self, file, existing_entries=None):
         self.initialize(file)
         config = self.config
diff --git a/beancount_reds_importers/libtransactionbuilder/transactionbuilder.py b/beancount_reds_importers/libtransactionbuilder/transactionbuilder.py
index f789e9b..31579a2 100644
--- a/beancount_reds_importers/libtransactionbuilder/transactionbuilder.py
+++ b/beancount_reds_importers/libtransactionbuilder/transactionbuilder.py
@@ -44,3 +44,14 @@ def set_config_variables(self, substs):
             self.config["filing_account"] = self.remove_empty_subaccounts(
                 filing_account
             )
+
+    def build_metadata(self, file, metatype=None, data={}):
+        """This method is for importers to override. The overridden method can
+        look at the metatype ('transaction', 'balance', 'account', 'commodity', etc.)
+        and the data dictionary to return additional metadata"""
+
+        # This 'filing_account' is read by a patch to bean-extract so it can output transactions to
+        # a file that corresponds with filing_account, when the one-file-per-account feature is
+        # used.
+        acct = self.config.get('filing_account', self.config.get('main_account', None))
+        return {"filing_account": acct}