diff --git a/CHANGELOG.md b/CHANGELOG.md
index 803a916f..2d3feded 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -308,6 +308,11 @@ per-file diff commands.
   now a date pair; `1500–2000` and `2000–5000` stay quantities. Two new `test_verify_pdf.py`
   cases; the date-pair one fails on master.
 
+- **Excel logical cells no longer become salary numbers** (#664, `tools/convert_salary_excel.py`) -
+  `TRUE` and `FALSE` cells are skipped as non-numeric instead of turning into counts or
+  salary indices of 1 and 0. Numeric 0 and 1 remain valid, and a count/index pair retains
+  its numeric half when the other cell is logical.
+
 ### Security
 
 - **CI no longer leaves the job token in `.git/config` or expands a PR-controlled name into a
diff --git a/tests/test_convert_salary_excel.py b/tests/test_convert_salary_excel.py
index 5518e541..8096a4f3 100644
--- a/tests/test_convert_salary_excel.py
+++ b/tests/test_convert_salary_excel.py
@@ -1,8 +1,18 @@
 import io
+import json
+from pathlib import Path
+import subprocess
+import sys
+import tempfile
 import unittest
 from contextlib import redirect_stderr
 from types import SimpleNamespace
 
+try:
+    import openpyxl
+except ImportError:
+    openpyxl = None
+
 from salary_lookup import format_entry
 from tools.convert_salary_excel import (
     INDEX_PATTERNS,
@@ -32,6 +42,51 @@ class FakeWorksheet:
         return [SimpleNamespace(value=value) for value in self.rows[row_number - 1]]
 
 
+@unittest.skipUnless(openpyxl is not None, "openpyxl is not installed")
+class BooleanCellCliTests(unittest.TestCase):
+    def test_excel_logical_cells_are_not_salary_numbers(self):
+        # Exercise the documented converter CLI with actual Excel boolean cells,
+        # including partial pairs and numeric 0/1 controls.
+        with tempfile.TemporaryDirectory() as tmp:
+            source = Path(tmp) / "salary.xlsx"
+            target = Path(tmp) / "salary.json"
+            workbook = openpyxl.Workbook()
+            sheet = workbook.active
+            sheet.append(["Company", "City", "Count", "Index", "Verified"])
+            sheet.append(["Logical Pair", "Berlin", True, False, True])
+            sheet.append(["Logical Count", "Berlin", False, 108.5, False])
+            sheet.append(["Logical Index", "Berlin", 12, True, None])
+            sheet.append(["Numeric Values", "Berlin", 0, 1, 0])
+            sheet.append(["Numeric Count", "Berlin", 1, 0, 1])
+            workbook.save(source)
+            workbook.close()
+
+            result = subprocess.run(
+                [sys.executable, str(Path(__file__).resolve().parents[1] /
+                                     "tools/convert_salary_excel.py"),
+                 str(source), "--output", str(target)],
+                capture_output=True, text=True,
+            )
+            self.assertEqual(result.returncode, 0, result.stdout + result.stderr)
+            companies = json.loads(target.read_text(encoding="utf-8"))["companies"]
+
+        self.assertEqual(companies[0]["categories"], {})
+        self.assertEqual(companies[1]["categories"], {
+            "all_employees": {"count": None, "index": 108.5},
+        })
+        self.assertEqual(companies[2]["categories"], {
+            "all_employees": {"count": 12, "index": None},
+        })
+        self.assertEqual(companies[3]["categories"], {
+            "all_employees": {"count": 0, "index": 1.0},
+            "verified": {"index": 0.0},
+        })
+        self.assertEqual(companies[4]["categories"], {
+            "all_employees": {"count": 1, "index": 0.0},
+            "verified": {"index": 1.0},
+        })
+
+
 class DetectColumnTypeTests(unittest.TestCase):
     def test_index_headers_are_not_misclassified_as_count(self):
         for header in ("Index", "Salary Index", "Engineering Index", "Median salary"):
diff --git a/tools/convert_salary_excel.py b/tools/convert_salary_excel.py
index f844552e..728f427c 100644
--- a/tools/convert_salary_excel.py
+++ b/tools/convert_salary_excel.py
@@ -68,6 +68,8 @@ def _finite_float(value):
 
 def parse_numeric_cell(value):
     """Parse numeric Excel values, including localized string cells."""
+    if isinstance(value, bool):
+        raise ValueError("not numeric")
     if isinstance(value, (int, float)):
         return _finite_float(value)
     if not isinstance(value, str):