diff --git a/tests/test_data_posting.py b/tests/test_data_posting.py
new file mode 100644
index 0000000000000000000000000000000000000000..b9ee686cf755e80fed4dd72d0ce161ac316428ac
--- /dev/null
+++ b/tests/test_data_posting.py
@@ -0,0 +1,94 @@
+"""Test Posting class"""
+# 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 pytest
+
+from . import testutil
+
+from decimal import Decimal
+
+import beancount.core.amount as bc_amount
+
+from conservancy_beancount import data
+
+PAYMENT_ACCOUNTS = {
+    'Assets:Cash',
+    'Assets:Checking',
+}
+
+NON_PAYMENT_ACCOUNTS = {
+    'Accrued:AccountsReceivable',
+    'Assets:PrepaidExpenses',
+    'Assets:PrepaidVacation',
+    'Expenses:Other',
+    'Income:Other',
+    'Liabilities:CreditCard',
+    'UnearnedIncome:MatchPledges',
+}
+
+def Posting(account, number,
+            currency='USD', cost=None, price=None, flag=None,
+            **meta):
+    if not meta:
+        meta = None
+    return data.Posting(
+        data.Account(account),
+        bc_amount.Amount(Decimal(number), currency),
+        cost,
+        price,
+        flag,
+        meta,
+    )
+
+def check_all_thresholds(post, threshold, expected):
+    assert post.is_payment(threshold) is expected
+    assert post.is_payment(-threshold) is expected
+    assert post.is_payment(Decimal(threshold)) is expected
+    assert post.is_payment(Decimal(-threshold)) is expected
+
+@pytest.mark.parametrize('acct', PAYMENT_ACCOUNTS)
+def test_is_payment(acct):
+    assert Posting(acct, -500).is_payment()
+
+@pytest.mark.parametrize('acct,amount,threshold', testutil.combine_values(
+    NON_PAYMENT_ACCOUNTS,
+    range(5, 20, 5),
+    range(0, 30, 10),
+))
+def test_is_not_payment_account(acct, amount, threshold):
+    post = Posting(acct, -amount)
+    assert not post.is_payment()
+    check_all_thresholds(post, threshold, False)
+
+@pytest.mark.parametrize('acct', PAYMENT_ACCOUNTS)
+def test_is_payment_with_threshold(acct):
+    threshold = len(acct) * 10
+    post = Posting(acct, -500)
+    check_all_thresholds(post, threshold, True)
+
+@pytest.mark.parametrize('acct', PAYMENT_ACCOUNTS)
+def test_is_not_payment_by_threshold(acct):
+    threshold = len(acct) * 10
+    post = Posting(acct, -9)
+    check_all_thresholds(post, threshold, False)
+
+@pytest.mark.parametrize('acct', PAYMENT_ACCOUNTS)
+def test_is_not_payment_but_credit(acct):
+    post = Posting(acct, 9)
+    assert not post.is_payment()
+    check_all_thresholds(post, 0, False)
+    check_all_thresholds(post, 5, False)
+    check_all_thresholds(post, 10, False)