diff --git a/conservancy_beancount/filters.py b/conservancy_beancount/filters.py
index 7c4bf3752f83402bca64dc3a913d84df59dbed23..8fbfec640bf0545020713c6eca4fa859f0d341f7 100644
--- a/conservancy_beancount/filters.py
+++ b/conservancy_beancount/filters.py
@@ -44,7 +44,7 @@ def audit_date(entries: Entries) -> Optional[datetime.date]:
             return entry.date
     return None
 
-def filter_meta_equal(postings: Postings, key: MetaKey, value: MetaValue) -> Postings:
+def filter_meta_equal(postings: Postings, key: MetaKey, value: MetaValue) -> Iterator[data.Posting]:
     for post in postings:
         try:
             if post.meta[key] == value:
@@ -52,7 +52,7 @@ def filter_meta_equal(postings: Postings, key: MetaKey, value: MetaValue) -> Pos
         except KeyError:
             pass
 
-def filter_meta_match(postings: Postings, key: MetaKey, regexp: Regexp) -> Postings:
+def filter_meta_match(postings: Postings, key: MetaKey, regexp: Regexp) -> Iterator[data.Posting]:
     for post in postings:
         try:
             if re.search(regexp, post.meta[key]):
@@ -60,7 +60,7 @@ def filter_meta_match(postings: Postings, key: MetaKey, regexp: Regexp) -> Posti
         except (KeyError, TypeError):
             pass
 
-def filter_for_rt_id(postings: Postings, ticket_id: Union[int, str]) -> Postings:
+def filter_for_rt_id(postings: Postings, ticket_id: Union[int, str]) -> Iterator[data.Posting]:
     """Filter postings with a primary RT ticket
 
     This functions yields postings where the *first* rt-id matches the given