diff --git a/fava_plugins/split_income.py b/fava_plugins/split_income.py
index 2a892d1..d215367 100644
--- a/fava_plugins/split_income.py
+++ b/fava_plugins/split_income.py
@@ -54,6 +54,7 @@
 import copy
 import re
 
+from beancount.core import convert
 from beancount.core import data
 from beancount.core import getters
 from beancount.core.inventory import Inventory
@@ -112,14 +113,15 @@ def split_income(entries, options_map, config_str):
         income = collections.defaultdict(Inventory)
         taxes = collections.defaultdict(Decimal)
         for posting in list(entry.postings):
+            weight = convert.get_weight(posting)
             if posting.account.startswith(config["income"]):
                 new_entry.postings.append(posting)
                 entry.postings.remove(posting)
-                income[posting.account].add_amount(posting.units)
+                income[posting.account].add_amount(weight)
             elif re.match(config["taxes"], posting.account):
                 new_entry.postings.append(posting)
                 entry.postings.remove(posting)
-                taxes[posting.units.currency] += posting.units.number
+                taxes[weight.currency] += weight.number
 
         for account, inv in income.items():
             net_account = account.replace(
diff --git a/tests/test_split_income.py b/tests/test_split_income.py
index 1db9865..93d98cf 100644
--- a/tests/test_split_income.py
+++ b/tests/test_split_income.py
@@ -99,3 +99,77 @@ def test_split_income_config(load_doc):
 
     assert len(entries) == 9
     assert len([e for e in entries if isinstance(e, data.Open)]) == 7
+
+
+def test_split_income_mixed_currency_income(load_doc):
+    """
+    plugin "fava_plugins.split_income" ""
+    plugin "beancount.plugins.auto_accounts"
+
+    2025-01-01 * "Employer" "Income"
+        Income:Work                       -10 USD @@ 9 EUR
+        Expenses:Taxes                      1 EUR
+        Assets:Account                      8 EUR
+    """
+
+    entries, errors, __ = load_doc
+
+    entries_after, _, __ = load_string(
+        """
+    2025-01-01 * "Employer" "Income"
+        Assets:Account                      8 EUR
+        Income:Net:Work                    -8 EUR
+
+    2025-01-01 * "Employer" "Income" #pretax
+        Income:Work                       -10 USD @ 0.9 EUR
+        Expenses:Taxes                     1 EUR
+        Income:Net:Work                    8 EUR
+    """,
+        dedent=True,
+    )
+
+    assert not errors
+    assert "pretax" in entries[5].tags
+
+    _compare_postings(entries[5], entries_after[1])
+    _compare_postings(entries[4], entries_after[0])
+
+    assert len(entries) == 6
+    assert len([e for e in entries if isinstance(e, data.Open)]) == 4
+
+
+def test_split_income_mixed_currency_others(load_doc):
+    """
+    plugin "fava_plugins.split_income" ""
+    plugin "beancount.plugins.auto_accounts"
+
+    2025-01-01 * "Employer" "Income"
+        Income:Work                       -11 USD
+        Expenses:Taxes                      1 EUR @ 1.1 USD
+        Assets:Account                      9 EUR @ 1.1 USD
+    """
+
+    entries, errors, __ = load_doc
+
+    entries_after, _, __ = load_string(
+        """
+    2025-01-01 * "Employer" "Income"
+        Assets:Account                      9 EUR @ 1.1 USD
+        Income:Net:Work                  -9.9 USD
+
+    2025-01-01 * "Employer" "Income" #pretax
+        Income:Work                       -11 USD
+        Expenses:Taxes                     1 EUR @ 1.1 USD
+        Income:Net:Work                    9.9 USD
+    """,
+        dedent=True,
+    )
+
+    assert not errors
+    assert "pretax" in entries[5].tags
+
+    _compare_postings(entries[5], entries_after[1])
+    _compare_postings(entries[4], entries_after[0])
+
+    assert len(entries) == 6
+    assert len([e for e in entries if isinstance(e, data.Open)]) == 4