diff --git a/conservancy_beancount/plugin/meta_income_type.py b/conservancy_beancount/plugin/meta_income_type.py
new file mode 100644
index 0000000..7671d72
--- /dev/null
+++ b/conservancy_beancount/plugin/meta_income_type.py
@@ -0,0 +1,52 @@
+"""meta_income_type - Validate income-type 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/>.
+
+from . import core
+from .. import data
+from .. import errors as errormod
+from ..beancount_types import (
+    MetaValueEnum,
+    Transaction,
+)
+
+class MetaIncomeType(core._NormalizePostingMetadataHook):
+    VALUES_ENUM = core.MetadataEnum('income-type', {
+        'Donations',
+        'Payable-Derecognition',
+        'RBI',
+        'UBTI',
+    })
+    DEFAULT_VALUES = {
+        'Income:Donations': 'Donations',
+        'Income:Honoraria': 'RBI',
+        'Income:Interest': 'RBI',
+        'Income:Interest:Dividend': 'RBI',
+        'Income:Royalties': 'RBI',
+        'Income:Sales': 'RBI',
+        'Income:SoftwareDevelopment': 'RBI',
+        'Income:TrademarkLicensing': 'RBI',
+        'UnearnedIncome:Conferences:Registrations': 'RBI',
+        'UnearnedIncome:MatchPledges': 'Donations',
+    }
+
+    def _run_on_post(self, txn: Transaction, post: data.Posting) -> bool:
+        return post.account.is_under('Income:', 'UnearnedIncome:') is not None
+
+    def _default_value(self, txn: Transaction, post: data.Posting) -> MetaValueEnum:
+        try:
+            return self.DEFAULT_VALUES[post.account]
+        except KeyError:
+            raise errormod.InvalidMetadataError(txn, post, self.METADATA_KEY) from None
diff --git a/tests/test_meta_income_type.py b/tests/test_meta_income_type.py
new file mode 100644
index 0000000..dc31011
--- /dev/null
+++ b/tests/test_meta_income_type.py
@@ -0,0 +1,152 @@
+"""Test handling of income-type 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_income_type
+
+VALID_VALUES = {
+    'Donations': 'Donations',
+    'Payable-Derecognition': 'Payable-Derecognition',
+    'RBI': 'RBI',
+    'UBTI': 'UBTI',
+}
+
+INVALID_VALUES = {
+    'Dontion',
+    'Payble-Derecognitoin',
+    'RIB',
+    'UTBI',
+    '',
+}
+
+TEST_KEY = 'income-type'
+
+@pytest.mark.parametrize('src_value,set_value', VALID_VALUES.items())
+def test_valid_values_on_postings(src_value, set_value):
+    txn = testutil.Transaction(postings=[
+        ('Assets:Cash', 25),
+        ('Income:Other', -25, {TEST_KEY: src_value}),
+    ])
+    checker = meta_income_type.MetaIncomeType()
+    errors = list(checker.run(txn))
+    assert not errors
+    testutil.check_post_meta(txn, None, {TEST_KEY: set_value})
+
+@pytest.mark.parametrize('src_value', INVALID_VALUES)
+def test_invalid_values_on_postings(src_value):
+    txn = testutil.Transaction(postings=[
+        ('Assets:Cash', 25),
+        ('Income:Other', -25, {TEST_KEY: src_value}),
+    ])
+    checker = meta_income_type.MetaIncomeType()
+    errors = list(checker.run(txn))
+    assert errors
+    testutil.check_post_meta(txn, None, {TEST_KEY: src_value})
+
+@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=[
+        ('Assets:Cash', 25),
+        ('Income:Other', -25),
+    ])
+    checker = meta_income_type.MetaIncomeType()
+    errors = list(checker.run(txn))
+    assert not errors
+    testutil.check_post_meta(txn, None, {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=[
+        ('Assets:Cash', 25),
+        ('Income:Other', -25),
+    ])
+    checker = meta_income_type.MetaIncomeType()
+    errors = list(checker.run(txn))
+    assert errors
+    testutil.check_post_meta(txn, None, None)
+
+@pytest.mark.parametrize('account', [
+    'Accrued:AccountsReceivable',
+    'Assets:Cash',
+    'Expenses:General',
+    'Liabilities:CreditCard',
+])
+def test_non_income_accounts_skipped(account):
+    meta = {TEST_KEY: 'RBI'}
+    txn = testutil.Transaction(postings=[
+        (account, 25),
+        ('Income:Other', -25, meta.copy()),
+    ])
+    checker = meta_income_type.MetaIncomeType()
+    errors = list(checker.run(txn))
+    assert not errors
+    testutil.check_post_meta(txn, None, meta)
+
+@pytest.mark.parametrize('account,set_value', [
+    ('Income:Donations', 'Donations'),
+    ('Income:Honoraria', 'RBI'),
+    ('Income:Interest', 'RBI'),
+    ('Income:Interest:Dividend', 'RBI'),
+    ('Income:Royalties', 'RBI'),
+    ('Income:Sales', 'RBI'),
+    ('Income:SoftwareDevelopment', 'RBI'),
+    ('Income:TrademarkLicensing', 'RBI'),
+    ('UnearnedIncome:Conferences:Registrations', 'RBI'),
+    ('UnearnedIncome:MatchPledges', 'Donations'),
+])
+def test_default_values(account, set_value):
+    txn = testutil.Transaction(postings=[
+        ('Assets:Cash', 25),
+        (account, -25),
+    ])
+    checker = meta_income_type.MetaIncomeType()
+    errors = list(checker.run(txn))
+    assert not errors
+    testutil.check_post_meta(txn, None, {TEST_KEY: set_value})
+
+@pytest.mark.parametrize('account', [
+    'Income:Other',
+])
+def test_no_default_value(account):
+    txn = testutil.Transaction(postings=[
+        ('Assets:Cash', 25),
+        (account, -25),
+    ])
+    checker = meta_income_type.MetaIncomeType()
+    errors = list(checker.run(txn))
+    assert errors
+    testutil.check_post_meta(txn, None, None)
+
+@pytest.mark.parametrize('date,set_value', [
+    (testutil.EXTREME_FUTURE_DATE, None),
+    (testutil.FUTURE_DATE, 'Donations'),
+    (testutil.FY_START_DATE, 'Donations'),
+    (testutil.FY_MID_DATE, 'Donations'),
+    (testutil.PAST_DATE, None),
+])
+def test_default_value_set_in_date_range(date, set_value):
+    txn = testutil.Transaction(date=date, postings=[
+        ('Assets:Cash', 25),
+        ('Income:Donations', -25),
+    ])
+    checker = meta_income_type.MetaIncomeType()
+    errors = list(checker.run(txn))
+    assert not errors
+    expect_meta = None if set_value is None else {TEST_KEY: set_value}
+    testutil.check_post_meta(txn, None, expect_meta)