diff --git a/input/demo-periods/Ф-1_2026-07.xlsx b/input/demo-periods/Ф-1_2026-07.xlsx
new file mode 100644
index 0000000..e78007c
Binary files /dev/null and b/input/demo-periods/Ф-1_2026-07.xlsx differ
diff --git a/input/demo-periods/Ф-3_2026.xlsx b/input/demo-periods/Ф-3_2026.xlsx
index b4489d1..856d961 100644
Binary files a/input/demo-periods/Ф-3_2026.xlsx and b/input/demo-periods/Ф-3_2026.xlsx differ
diff --git a/tests/apps/core/test_demo_period_workbooks.py b/tests/apps/core/test_demo_period_workbooks.py
index 7e78da0..b0c90ef 100644
--- a/tests/apps/core/test_demo_period_workbooks.py
+++ b/tests/apps/core/test_demo_period_workbooks.py
@@ -3,6 +3,9 @@
 import re
 from pathlib import Path
 
+from apps.form_1.models import FormF1Record
+from apps.form_1.services import FormF1Parser
+from apps.form_3.models import FormF3Record
 from apps.form_3.services import FormF3Parser
 from apps.form_4.services import FormF4Parser
 from apps.form_6.services import FormF6Parser
@@ -15,10 +18,51 @@ class DemoPeriodWorkbooksTest(TestCase):
     def test_form_f3_workbooks_match_current_schema(self):
         for path in sorted(DEMO_DIR.glob("Ф-3_*.xlsx")):
             year = int(re.search(r"_(\d{4})", path.name).group(1))
-            with self.subTest(path=path.name), path.open("rb") as file:
-                result = FormF3Parser(report_year=year).parse(file)
-                self.assertEqual(result.loaded_count, 20)
-                self.assertEqual(result.skipped_count, 0)
+            f1_path = max(
+                DEMO_DIR.glob(f"Ф-1_{year}-*.xlsx"),
+                key=lambda item: int(re.search(r"-(\d{2})", item.name).group(1)),
+            )
+            report_month = int(re.search(r"-(\d{2})", f1_path.name).group(1))
+            with (
+                self.subTest(path=path.name),
+                f1_path.open("rb") as f1_file,
+                path.open("rb") as f3_file,
+            ):
+                f1_result = FormF1Parser(
+                    report_year=year,
+                    report_month=report_month,
+                ).parse(f1_file)
+                f3_result = FormF3Parser(report_year=year).parse(f3_file)
+                self.assertEqual(f1_result.loaded_count, 20)
+                self.assertEqual(f1_result.skipped_count, 0)
+                self.assertEqual(f3_result.loaded_count, 20)
+                self.assertEqual(f3_result.skipped_count, 0)
+
+                for f3_record in FormF3Record.objects.filter(
+                    load_batch=f3_result.batch_id
+                ).select_related("organization"):
+                    f1_record = FormF1Record.objects.get(
+                        organization=f3_record.organization,
+                        load_batch=f1_result.batch_id,
+                    )
+                    age_group_total = sum(
+                        (
+                            f3_record.employees_under_20,
+                            f3_record.employees_20_29,
+                            f3_record.employees_30_39,
+                            f3_record.employees_40_49,
+                            f3_record.employees_50_59,
+                            f3_record.employees_over_60,
+                        )
+                    )
+                    self.assertEqual(
+                        age_group_total,
+                        int(f1_record.avg_employees),
+                        msg=(
+                            f"{path.name}: возрастные группы не совпадают "
+                            f"с {f1_path.name} для ИНН {f3_record.organization.inn}"
+                        ),
+                    )
 
     def test_form_f4_workbooks_match_current_schema(self):
         for path in sorted(DEMO_DIR.glob("Ф-4_*.xlsx")):