diff --git a/tests/test_reports_period_postings.py b/tests/test_reports_period_postings.py
new file mode 100644
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+++ b/tests/test_reports_period_postings.py
@@ -0,0 +1,71 @@
+"""test_reports_period_postings - Unit tests for PeriodPostings"""
+# Copyright © 2020  Brett Smith
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import datetime
+import operator
+
+from decimal import Decimal
+
+import pytest
+
+from . import testutil
+
+from conservancy_beancount import data
+from conservancy_beancount.reports import core
+
+def check_balance_attrs(balance_postings, start_usd, stop_usd):
+    if start_usd:
+        expected = {'USD': testutil.Amount(start_usd)}
+        assert balance_postings.start_bal == expected
+        assert balance_postings.begin_bal == expected
+    else:
+        assert balance_postings.start_bal.is_zero()
+        assert balance_postings.begin_bal.is_zero()
+    expected = {'USD': testutil.Amount(stop_usd)}
+    assert balance_postings.stop_bal == expected
+    assert balance_postings.end_bal == expected
+    expected = {'USD': testutil.Amount(stop_usd - start_usd)}
+    assert balance_postings.period_bal == expected
+
+@pytest.mark.parametrize('start_date,expect_start_bal', [
+    (datetime.date(2019, 2, 1), 0),
+    (datetime.date(2019, 4, 1), 30),
+    (datetime.date(2019, 6, 1), 120),
+])
+def test_balance_postings_attrs(start_date, expect_start_bal):
+    entries = [testutil.Transaction(date=datetime.date(2019, n, 15), postings=[
+        ('Income:Donations', -n * 10),
+        ('Assets:Cash', n * 10),
+    ]) for n in range(3, 7)]
+    cls = core.PeriodPostings.with_start_date(start_date)
+    actual = dict(cls.group_by_account(data.Posting.from_entries(entries)))
+    assert len(actual) == 2
+    check_balance_attrs(actual['Assets:Cash'], expect_start_bal, 180)
+    check_balance_attrs(actual['Income:Donations'], -expect_start_bal, -180)
+
+@pytest.mark.parametrize('start_date,expect_count', [
+    (datetime.date(2019, 2, 1), 4),
+    (datetime.date(2019, 4, 1), 3),
+    (datetime.date(2019, 6, 1), 1),
+])
+def test_balance_postings_filter(start_date, expect_count):
+    entries = [testutil.Transaction(date=datetime.date(2019, n, 15), postings=[
+        ('Income:Donations', -n * 10),
+        ('Assets:Cash', n * 10),
+    ]) for n in range(3, 7)]
+    cls = core.PeriodPostings.with_start_date(start_date)
+    for _, related in cls.group_by_account(data.Posting.from_entries(entries)):
+        assert len(related) == expect_count