diff --git a/tests/test_meta_tax_implication.py b/tests/test_meta_tax_implication.py
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+++ b/tests/test_meta_tax_implication.py
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+"""Test handling of tax-implication metadata"""
+# 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 conservancy_beancount.plugin import meta_tax_implication
+
+VALID_VALUES = {
+    '1099': '1099',
+    'Accountant-Advises-No-1099': 'Accountant-Advises-No-1099',
+    'Bank-Transfer': 'Bank-Transfer',
+    'Foreign-Corporation': 'Foreign-Corporation',
+    'Foreign-Individual-Contractor': 'Foreign-Individual-Contractor',
+    'Fraud': 'Fraud',
+    'HSA-Contribution': 'HSA-Contribution',
+    'Loan': 'Loan',
+    'Payroll': 'Payroll',
+    'Refund': 'Refund',
+    'Reimbursement': 'Reimbursement',
+    'Retirement-Pretax': 'Retirement-Pretax',
+    'Tax-Payment': 'Tax-Payment',
+    'USA-501c3': 'USA-501c3',
+    'USA-Corporation': 'USA-Corporation',
+    'USA-LLC-No-1099': 'USA-LLC-No-1099',
+    'W2': 'W2',
+}
+
+INVALID_VALUES = {
+    '199',
+    'W3',
+    'Payrol',
+    '',
+}
+
+TEST_KEY = 'tax-implication'
+
+@pytest.mark.parametrize('src_value,set_value', VALID_VALUES.items())
+def test_valid_values_on_postings(src_value, set_value):
+    txn = testutil.Transaction(postings=[
+        ('Accrued:AccountsPayable', 25),
+        ('Assets:Cash', -25, {TEST_KEY: src_value}),
+    ])
+    checker = meta_tax_implication.MetaTaxImplication()
+    errors = checker.run(txn, txn.postings[-1], -1)
+    assert not errors
+    assert txn.postings[-1].meta.get(TEST_KEY) == set_value
+
+@pytest.mark.parametrize('src_value', INVALID_VALUES)
+def test_invalid_values_on_postings(src_value):
+    txn = testutil.Transaction(postings=[
+        ('Accrued:AccountsPayable', 25),
+        ('Assets:Cash', -25, {TEST_KEY: src_value}),
+    ])
+    checker = meta_tax_implication.MetaTaxImplication()
+    errors = checker.run(txn, txn.postings[-1], -1)
+    assert errors
+
+@pytest.mark.parametrize('src_value,set_value', VALID_VALUES.items())
+def test_valid_values_on_transactions(src_value, set_value):
+    txn = testutil.Transaction(**{TEST_KEY: src_value}, postings=[
+        ('Accrued:AccountsPayable', 25),
+        ('Assets:Cash', -25),
+    ])
+    checker = meta_tax_implication.MetaTaxImplication()
+    errors = checker.run(txn, txn.postings[-1], -1)
+    assert not errors
+    assert txn.postings[-1].meta.get(TEST_KEY) == set_value
+
+@pytest.mark.parametrize('src_value', INVALID_VALUES)
+def test_invalid_values_on_transactions(src_value):
+    txn = testutil.Transaction(**{TEST_KEY: src_value}, postings=[
+        ('Accrued:AccountsPayable', 25),
+        ('Assets:Cash', -25),
+    ])
+    checker = meta_tax_implication.MetaTaxImplication()
+    errors = checker.run(txn, txn.postings[-1], -1)
+    assert errors
+
+@pytest.mark.parametrize('account', [
+    'Accrued:AccountsPayable',
+    'Expenses:General',
+    'Liabilities:CreditCard',
+])
+def test_non_asset_accounts_skipped(account):
+    txn = testutil.Transaction(postings=[
+        (account, 25),
+        ('Assets:Cash', -25, {TEST_KEY: 'USA-Corporation'}),
+    ])
+    checker = meta_tax_implication.MetaTaxImplication()
+    errors = checker.run(txn, txn.postings[0], 0)
+    assert not errors
+
+def test_asset_credits_skipped():
+    txn = testutil.Transaction(postings=[
+        ('Income:Donations', -25),
+        ('Assets:Cash', 25),
+    ])
+    checker = meta_tax_implication.MetaTaxImplication()
+    errors = checker.run(txn, txn.postings[-1], -1)
+    assert not errors
+    assert not txn.postings[-1].meta
+
+@pytest.mark.parametrize('date,need_value', [
+    (testutil.EXTREME_FUTURE_DATE, False),
+    (testutil.FUTURE_DATE, True),
+    (testutil.FY_START_DATE, True),
+    (testutil.FY_MID_DATE, True),
+    (testutil.PAST_DATE, False),
+])
+def test_default_value_set_in_date_range(date, need_value):
+    txn = testutil.Transaction(date=date, postings=[
+        ('Liabilites:CreditCard', 25),
+        ('Assets:Cash', -25),
+    ])
+    checker = meta_tax_implication.MetaTaxImplication()
+    errors = checker.run(txn, txn.postings[-1], -1)
+    assert bool(errors) == bool(need_value)