diff --git a/apps/reports/services/exporters.py b/apps/reports/services/exporters.py
index 0bf5c8a..3d0fd86 100644
--- a/apps/reports/services/exporters.py
+++ b/apps/reports/services/exporters.py
@@ -225,6 +225,41 @@ def _percentage_display(locale: ExportLocale, rows: list[dict], row_data: dict,
     return "-"
 
 
+def _percentage_number(rows: list[dict] | None, row_data: dict) -> float:
+    row_id = str(row_data.get("id")) if row_data.get("id") is not None else None
+    row_name = row_data.get("name")
+    for row in rows or []:
+        if row_id is not None and str(row.get("id")) == row_id:
+            try:
+                return float(row.get("percentage") or 0)
+            except (TypeError, ValueError):
+                return 0.0
+        if row_name and row.get("name") == row_name:
+            try:
+                return float(row.get("percentage") or 0)
+            except (TypeError, ValueError):
+                return 0.0
+    return 0.0
+
+
+def _percentage_sort_value(row: dict) -> float:
+    try:
+        return float(row.get("percentage") or 0)
+    except (TypeError, ValueError):
+        return 0.0
+
+
+def _sort_breakdown_rows(rows: list[dict], hour_percentages: list[dict] | None) -> list[dict]:
+    return sorted(
+        rows,
+        key=lambda row: (
+            -_percentage_number(hour_percentages, row),
+            -(row.get("billable_seconds") or 0),
+            row.get("name") or "",
+        ),
+    )
+
+
 def _percentage_value(locale: ExportLocale, percentage: str, *, ascii_digits: bool = False) -> str:
     value = f"{locale.format_amount(percentage, ascii_digits=ascii_digits)}%"
     return f"\u202B{value}\u202C" if locale.is_rtl and ascii_digits else value  # Unicode bidi control characters
@@ -244,7 +279,7 @@ def _summary_breakdown_rows(
             _percentage_value(locale, row["percentage"], ascii_digits=True),
             _percentage_display(locale, income_rows, row, ascii_digits=True),
         ]
-        for row in hour_rows
+        for row in sorted(hour_rows, key=lambda row: (-_percentage_sort_value(row), row.get("name") or ""))
     ]
 
 
@@ -508,7 +543,7 @@ def _append_breakdown_table(
         _apply_cell_style(worksheet.cell(row=worksheet.max_row, column=1), rtl=locale.is_rtl)
         return
 
-    for row in rows:
+    for row in _sort_breakdown_rows(rows, hour_percentages):
         values = [
             row["name"],
             locale.format_duration(row["billable_duration"], ascii_digits=True),
@@ -808,8 +843,9 @@ def _render_all_users_overall_excel_sheet(
             fill=HEADER_FILL,
         )
         current_row += 1
-        if rows:
-            for row in rows:
+        sorted_rows = _sort_breakdown_rows(rows, hour_percentages)
+        if sorted_rows:
+            for row in sorted_rows:
                 _write_table_row(
                     worksheet,
                     row=current_row,
@@ -1172,7 +1208,8 @@ def _append_pdf_report_sections(
             hour_percentage_rows = user_summary[f"{prefix}_percentages"]
             income_percentage_rows = user_summary[f"{prefix}_income_percentages"]
         header = _rtl_row(locale, header_values)
-        body_rows = _report_table_rows(locale, rows, is_daily=is_daily)
+        sorted_rows = rows if is_daily else _sort_breakdown_rows(rows, hour_percentage_rows)
+        body_rows = _report_table_rows(locale, sorted_rows, is_daily=is_daily)
         if hour_percentage_rows is not None:
             body_rows = [
                 _rtl_row(
@@ -1193,7 +1230,7 @@ def _append_pdf_report_sections(
                         _percentage_display(locale, income_percentage_rows or [], row),
                     ],
                 )
-                for row in rows
+                for row in sorted_rows
             ] or [
                 _rtl_row(
                     locale,
diff --git a/apps/reports/tests/test_exporters.py b/apps/reports/tests/test_exporters.py
index 1b65f2e..a717fa8 100644
--- a/apps/reports/tests/test_exporters.py
+++ b/apps/reports/tests/test_exporters.py
@@ -7,6 +7,7 @@ from apps.reports.services.export_i18n import build_export_locale
 from apps.reports.services.exporters import (
     _pdf_summary_rate_label,
     _rate_label,
+    _sort_breakdown_rows,
     build_excel_report,
     build_pdf_report,
 )
@@ -133,6 +134,23 @@ class ReportExporterTests(TestCase):
             "Variable rate",
         )
 
+    def test_breakdown_rows_are_sorted_by_hour_percentage(self):
+        rows = [
+            {"id": "low", "name": "Low", "billable_seconds": 7200},
+            {"id": "high", "name": "High", "billable_seconds": 3600},
+            {"id": "tie", "name": "Tie", "billable_seconds": 10800},
+        ]
+        percentages = [
+            {"id": "low", "name": "Low", "percentage": "20"},
+            {"id": "high", "name": "High", "percentage": "70"},
+            {"id": "tie", "name": "Tie", "percentage": "20"},
+        ]
+
+        self.assertEqual(
+            [row["name"] for row in _sort_breakdown_rows(rows, percentages)],
+            ["High", "Tie", "Low"],
+        )
+
     def test_excel_export_adds_per_user_sheets_and_daily_rate_column(self):
         locale = build_export_locale("en")
         report_data = make_report_data(