diff --git a/conservancy_beancount/reports/core.py b/conservancy_beancount/reports/core.py
index 1d271a7..3a0fbbe 100644
--- a/conservancy_beancount/reports/core.py
+++ b/conservancy_beancount/reports/core.py
@@ -126,6 +126,9 @@ class RelatedPostings(Sequence[data.Posting]):
     def add(self, post: data.Posting) -> None:
         self._postings.append(post)
 
+    def clear(self) -> None:
+        self._postings.clear()
+
     def iter_with_balance(self) -> Iterable[Tuple[data.Posting, Balance]]:
         balance = MutableBalance()
         for post in self:
diff --git a/tests/test_reports_related_postings.py b/tests/test_reports_related_postings.py
index f0bb60b..1848c0f 100644
--- a/tests/test_reports_related_postings.py
+++ b/tests/test_reports_related_postings.py
@@ -78,6 +78,13 @@ def test_balance_credit_card(credit_card_cycle):
         assert related.balance() == testutil.balance_map(USD=expected)
     assert expected == 0
 
+def test_clear():
+    related = core.RelatedPostings()
+    related.add(testutil.Posting('Income:Donations', -10))
+    assert related.balance()
+    related.clear()
+    assert not related.balance()
+
 def check_iter_with_balance(entries):
     expect_posts = [txn.postings[0] for txn in entries]
     expect_balances = []