diff --git a/backend/lcfs/tests/compliance_report/conftest.py b/backend/lcfs/tests/compliance_report/conftest.py
index 0699cd20..58fccd34 100644
--- a/backend/lcfs/tests/compliance_report/conftest.py
+++ b/backend/lcfs/tests/compliance_report/conftest.py
@@ -195,6 +195,7 @@ def _create_compliance_report_summary(
         version=1,
         is_locked=False,
         quarter=None,
+        can_sign=False
     ):
 
         return ComplianceReportSummarySchema(
@@ -206,6 +207,7 @@ def _create_compliance_report_summary(
             version=version,
             is_locked=is_locked,
             quarter=quarter,
+            can_sign=can_sign
         )
 
     return _create_compliance_report_summary
diff --git a/backend/lcfs/tests/compliance_report/test_compliance_report_repo.py b/backend/lcfs/tests/compliance_report/test_compliance_report_repo.py
index cf05ce02..7dda1756 100644
--- a/backend/lcfs/tests/compliance_report/test_compliance_report_repo.py
+++ b/backend/lcfs/tests/compliance_report/test_compliance_report_repo.py
@@ -943,7 +943,8 @@ async def test_calculate_fuel_quantities_success_not_fossil_derived(
     )
 
     result = await compliance_report_repo.calculate_fuel_quantities(
-        compliance_report=compliance_reports[0],
+        compliance_report_id=compliance_reports[0].compliance_report_id,
+        effective_fuel_supplies=non_fossil_fuel_supplies,
         fossil_derived=False,
     )
 
@@ -965,7 +966,8 @@ async def test_calculate_fuel_quantities_success_fossil_derived(
     )
 
     result = await compliance_report_repo.calculate_fuel_quantities(
-        compliance_report=compliance_reports[0],
+        compliance_report_id=compliance_reports[0].compliance_report_id,
+        effective_fuel_supplies=fossil_fuel_supplies,
         fossil_derived=True,
     )
 
diff --git a/backend/lcfs/tests/compliance_report/test_compliance_report_views.py b/backend/lcfs/tests/compliance_report/test_compliance_report_views.py
index 54101585..9741e568 100644
--- a/backend/lcfs/tests/compliance_report/test_compliance_report_views.py
+++ b/backend/lcfs/tests/compliance_report/test_compliance_report_views.py
@@ -11,6 +11,7 @@
 from lcfs.web.api.base import FilterModel
 from lcfs.web.api.compliance_report.schema import (
     ComplianceReportUpdateSchema,
+    ComplianceReportSummaryUpdateSchema,
 )
 from lcfs.services.s3.client import DocumentService
 
@@ -329,6 +330,7 @@ async def test_get_compliance_report_summary_success(
         mock_calculate_compliance_report_summary.assert_called_once_with(1)
         mock_validate_organization_access.assert_called_once_with(1)
 
+
 @pytest.mark.anyio
 async def test_get_compliance_report_summary_invalid_payload(
     client: AsyncClient,
@@ -386,6 +388,13 @@ async def test_update_compliance_report_summary_success(
         set_mock_user(fastapi_app, [RoleEnum.SUPPLIER])
 
         mock_compliance_report_summary = compliance_report_summary_schema()
+        request_schema = ComplianceReportSummaryUpdateSchema(
+            compliance_report_id=1,
+            renewable_fuel_target_summary=mock_compliance_report_summary.renewable_fuel_target_summary,
+            low_carbon_fuel_target_summary=mock_compliance_report_summary.low_carbon_fuel_target_summary,
+            non_compliance_penalty_summary=mock_compliance_report_summary.non_compliance_penalty_summary,
+            summary_id=mock_compliance_report_summary.summary_id,
+        )
         mock_validate_organization_access.return_value = None
         mock_update_compliance_report_summary.return_value = (
             mock_compliance_report_summary
@@ -393,7 +402,7 @@ async def test_update_compliance_report_summary_success(
 
         url = fastapi_app.url_path_for("update_compliance_report_summary", report_id=1)
 
-        payload = mock_compliance_report_summary.dict(by_alias=True)
+        payload = request_schema.model_dump(by_alias=True)
 
         response = await client.put(url, json=payload)
 
@@ -404,9 +413,7 @@ async def test_update_compliance_report_summary_success(
         )
 
         assert response.json() == expected_response
-        mock_update_compliance_report_summary.assert_called_once_with(
-            1, mock_compliance_report_summary
-        )
+        mock_update_compliance_report_summary.assert_called_once_with(1, request_schema)
         mock_validate_organization_access.assert_called_once_with(1)
 
 
@@ -507,6 +514,7 @@ async def test_update_compliance_report_success(
         )
         mock_validate_organization_access.assert_called_once_with(1)
 
+
 @pytest.mark.anyio
 async def test_update_compliance_report_forbidden(
     client: AsyncClient,
diff --git a/backend/lcfs/tests/compliance_report/test_summary_service.py b/backend/lcfs/tests/compliance_report/test_summary_service.py
index e64e0022..fd61bf89 100644
--- a/backend/lcfs/tests/compliance_report/test_summary_service.py
+++ b/backend/lcfs/tests/compliance_report/test_summary_service.py
@@ -4,7 +4,9 @@
 import pytest
 
 from lcfs.db.models.compliance.ComplianceReportSummary import ComplianceReportSummary
-from lcfs.web.api.compliance_report.schema import ComplianceReportSummaryRowSchema
+from lcfs.web.api.compliance_report.schema import (
+    ComplianceReportSummaryRowSchema,
+)
 
 
 @pytest.mark.anyio
@@ -670,3 +672,94 @@ async def test_calculate_renewable_fuel_target_summary_no_copy_lines_6_and_8(
     assert result[7].gasoline == 0  # Line 8 should not be copied
     assert result[7].diesel == 0
     assert result[7].jet_fuel == 0
+
+
+@pytest.mark.anyio
+async def test_can_sign_flag_logic(
+    compliance_report_summary_service, mock_repo, mock_trxn_repo
+):
+    # Scenario 1: All conditions met
+    mock_effective_fuel_supplies = [MagicMock()]
+    mock_notional_transfers = MagicMock(notional_transfers=[MagicMock()])
+    mock_fuel_exports = [MagicMock()]
+    mock_allocation_agreements = [MagicMock()]
+    mock_compliance_report = MagicMock(
+        compliance_report_group_uuid="mock-group-uuid",
+        compliance_period=MagicMock(effective_date=MagicMock(year=2024)),
+        organization_id=1,
+        compliance_report_id=1,
+        summary=MagicMock(is_locked=False),
+    )
+
+    mock_trxn_repo.calculate_available_balance_for_period.return_value = 1000
+
+    # Mock previous retained and obligation dictionaries
+    previous_retained = {"gasoline": 10, "diesel": 20, "jet_fuel": 30}
+    previous_obligation = {"gasoline": 5, "diesel": 10, "jet_fuel": 15}
+
+    # Mock repository methods
+    mock_repo.get_compliance_report_by_id = AsyncMock(
+        return_value=mock_compliance_report
+    )
+    mock_repo.calculate_fuel_quantities = AsyncMock(
+        return_value={
+            "gasoline": 100,
+            "diesel": 50,
+            "jet_fuel": 25,
+        }
+    )
+    mock_repo.get_assessed_compliance_report_by_period = AsyncMock(
+        return_value=MagicMock(
+            summary=MagicMock(
+                line_6_renewable_fuel_retained_gasoline=previous_retained["gasoline"],
+                line_6_renewable_fuel_retained_diesel=previous_retained["diesel"],
+                line_6_renewable_fuel_retained_jet_fuel=previous_retained["jet_fuel"],
+                line_8_obligation_deferred_gasoline=previous_obligation["gasoline"],
+                line_8_obligation_deferred_diesel=previous_obligation["diesel"],
+                line_8_obligation_deferred_jet_fuel=previous_obligation["jet_fuel"],
+            )
+        )
+    )
+
+    compliance_report_summary_service.fuel_supply_repo.get_effective_fuel_supplies = (
+        AsyncMock(return_value=mock_effective_fuel_supplies)
+    )
+    compliance_report_summary_service.notional_transfer_service.calculate_notional_transfers = AsyncMock(
+        return_value=mock_notional_transfers
+    )
+    compliance_report_summary_service.fuel_export_repo.get_effective_fuel_exports = (
+        AsyncMock(return_value=mock_fuel_exports)
+    )
+    compliance_report_summary_service.allocation_agreement_repo.get_allocation_agreements = AsyncMock(
+        return_value=mock_allocation_agreements
+    )
+
+    # Call the method
+    result = (
+        await compliance_report_summary_service.calculate_compliance_report_summary(1)
+    )
+
+    # Assert that `can_sign` is True
+    assert result.can_sign is True
+
+    # Scenario 2: No conditions met
+    compliance_report_summary_service.fuel_supply_repo.get_effective_fuel_supplies = (
+        AsyncMock(return_value=[])
+    )
+    compliance_report_summary_service.notional_transfer_service.calculate_notional_transfers = AsyncMock(
+        return_value=MagicMock(notional_transfers=[])
+    )
+    compliance_report_summary_service.fuel_export_repo.get_effective_fuel_exports = (
+        AsyncMock(return_value=[])
+    )
+    compliance_report_summary_service.allocation_agreement_repo.get_allocation_agreements = AsyncMock(
+        return_value=[]
+    )
+
+    # Call the method again
+    result = (
+        await compliance_report_summary_service.calculate_compliance_report_summary(1)
+    )
+
+    # Assert that `can_sign` is False
+    assert result.can_sign is False
diff --git a/backend/lcfs/tests/compliance_report/test_update_service.py b/backend/lcfs/tests/compliance_report/test_update_service.py
index 077d560b..07285f21 100644
--- a/backend/lcfs/tests/compliance_report/test_update_service.py
+++ b/backend/lcfs/tests/compliance_report/test_update_service.py
@@ -14,14 +14,16 @@
     ComplianceReportSummaryRowSchema,
     ComplianceReportSummarySchema,
 )
-from lcfs.web.exception.exceptions import DataNotFoundException
+from lcfs.web.exception.exceptions import DataNotFoundException, ServiceException
+
 
 # Mock for user_has_roles function
 @pytest.fixture
 def mock_user_has_roles():
-    with patch('lcfs.web.api.compliance_report.update_service.user_has_roles') as mock:
+    with patch("lcfs.web.api.compliance_report.update_service.user_has_roles") as mock:
         yield mock
 
+
 # Mock for adjust_balance method within the OrganizationsService
 @pytest.fixture
 def mock_org_service():
@@ -29,6 +31,7 @@ def mock_org_service():
     mock_org_service.adjust_balance = AsyncMock()  # Mock the adjust_balance method
     return mock_org_service
 
+
 # update_compliance_report
 @pytest.mark.anyio
 async def test_update_compliance_report_status_change(
@@ -61,7 +64,9 @@ async def test_update_compliance_report_status_change(
 
     # Assertions
     assert updated_report == mock_report
-    mock_repo.get_compliance_report_by_id.assert_called_once_with(report_id, is_model=True)
+    mock_repo.get_compliance_report_by_id.assert_called_once_with(
+        report_id, is_model=True
+    )
     mock_repo.get_compliance_report_status_by_desc.assert_called_once_with(
         report_data.status
     )
@@ -109,7 +114,9 @@ async def test_update_compliance_report_no_status_change(
 
     # Assertions
     assert updated_report == mock_report
-    mock_repo.get_compliance_report_by_id.assert_called_once_with(report_id, is_model=True)
+    mock_repo.get_compliance_report_by_id.assert_called_once_with(
+        report_id, is_model=True
+    )
     mock_repo.get_compliance_report_status_by_desc.assert_called_once_with(
         report_data.status
     )
@@ -140,7 +147,10 @@ async def test_update_compliance_report_not_found(
             report_id, report_data
         )
 
-    mock_repo.get_compliance_report_by_id.assert_called_once_with(report_id, is_model=True)
+    mock_repo.get_compliance_report_by_id.assert_called_once_with(
+        report_id, is_model=True
+    )
+
 
 @pytest.mark.anyio
 async def test_handle_submitted_status_insufficient_permissions(
@@ -161,12 +171,17 @@ async def test_handle_submitted_status_insufficient_permissions(
     assert exc_info.value.status_code == 403
     assert exc_info.value.detail == "Forbidden."
 
+
 # SUBMIT STATUS TESTS
 
 
 @pytest.mark.anyio
 async def test_handle_submitted_status_with_existing_summary(
-    compliance_report_update_service, mock_repo, mock_user_has_roles, mock_org_service, compliance_report_summary_service
+    compliance_report_update_service,
+    mock_repo,
+    mock_user_has_roles,
+    mock_org_service,
+    compliance_report_summary_service,
 ):
     # Mock data
     report_id = 1
@@ -216,6 +231,7 @@ async def test_handle_submitted_status_with_existing_summary(
                 line="21", field="non_compliance_penalty_payable", value=0
             ),
         ],
+        can_sign=True,
     )
 
     # Set up mocks
@@ -236,7 +252,7 @@ async def test_handle_submitted_status_with_existing_summary(
     # Assertions
     mock_user_has_roles.assert_called_once_with(
         compliance_report_update_service.request.user,
-        [RoleEnum.SUPPLIER, RoleEnum.SIGNING_AUTHORITY]
+        [RoleEnum.SUPPLIER, RoleEnum.SIGNING_AUTHORITY],
     )
     mock_repo.get_summary_by_report_id.assert_called_once_with(report_id)
     compliance_report_summary_service.calculate_compliance_report_summary.assert_called_once_with(
@@ -260,7 +276,11 @@ async def test_handle_submitted_status_with_existing_summary(
 
 @pytest.mark.anyio
 async def test_handle_submitted_status_without_existing_summary(
-    compliance_report_update_service, mock_repo, mock_user_has_roles, mock_org_service, compliance_report_summary_service
+    compliance_report_update_service,
+    mock_repo,
+    mock_user_has_roles,
+    mock_org_service,
+    compliance_report_summary_service,
 ):
     # Mock data
     report_id = 1
@@ -307,6 +327,7 @@ async def test_handle_submitted_status_without_existing_summary(
                 line="21", field="non_compliance_penalty_payable", value=0
             ),
         ],
+        can_sign=True,
     )
 
     # Set up mocks
@@ -346,7 +367,11 @@ async def test_handle_submitted_status_without_existing_summary(
 
 @pytest.mark.anyio
 async def test_handle_submitted_status_partial_existing_values(
-    compliance_report_update_service, mock_repo, mock_user_has_roles, mock_org_service, compliance_report_summary_service
+    compliance_report_update_service,
+    mock_repo,
+    mock_user_has_roles,
+    mock_org_service,
+    compliance_report_summary_service,
 ):
     # Mock data
     report_id = 1
@@ -397,6 +422,7 @@ async def test_handle_submitted_status_partial_existing_values(
                 line="21", field="non_compliance_penalty_payable", value=0
             ),
         ],
+        can_sign=True,
     )
 
     # Set up mocks
@@ -427,7 +453,11 @@ async def test_handle_submitted_status_partial_existing_values(
 
 @pytest.mark.anyio
 async def test_handle_submitted_status_no_user_edits(
-    compliance_report_update_service, mock_repo, mock_user_has_roles, mock_org_service, compliance_report_summary_service
+    compliance_report_update_service,
+    mock_repo,
+    mock_user_has_roles,
+    mock_org_service,
+    compliance_report_summary_service,
 ):
     # Mock data
     report_id = 1
@@ -482,6 +512,7 @@ async def test_handle_submitted_status_no_user_edits(
                 line="21", field="non_compliance_penalty_payable", value=0
             ),
         ],
+        can_sign=True,
     )
 
     # Set up mocks
@@ -508,3 +539,46 @@ async def test_handle_submitted_status_no_user_edits(
     assert (
         saved_summary.renewable_fuel_target_summary[2].jet_fuel == 900
     )  # Used calculated value
+
+
+@pytest.mark.anyio
+async def test_handle_submitted_no_sign(
+    compliance_report_update_service,
+    mock_repo,
+    mock_user_has_roles,
+    mock_org_service,
+    compliance_report_summary_service,
+):
+    # Mock data
+    report_id = 1
+    mock_report = MagicMock(spec=ComplianceReport)
+    mock_report.compliance_report_id = report_id
+    mock_report.summary = MagicMock(spec=ComplianceReportSummary)
+    mock_report.summary.summary_id = 100
+    # Mock user roles (user has required roles)
+    mock_user_has_roles.return_value = True
+    compliance_report_update_service.request = MagicMock()
+    compliance_report_update_service.request.user = MagicMock()
+    # Mock existing summary with no user-edited values
+    existing_summary = MagicMock(spec=ComplianceReportSummary)
+
+    # Mock calculated summary
+    calculated_summary = ComplianceReportSummarySchema(
+        summary_id=100,
+        compliance_report_id=report_id,
+        renewable_fuel_target_summary=[],
+        low_carbon_fuel_target_summary=[],
+        non_compliance_penalty_summary=[],
+        can_sign=False,
+    )
+
+    # Set up mocks
+    mock_repo.get_summary_by_report_id.return_value = existing_summary
+    compliance_report_summary_service.calculate_compliance_report_summary = AsyncMock(
+        return_value=calculated_summary
+    )
+    # Inject the mocked org_service into the service being tested
+    compliance_report_update_service.org_service = mock_org_service
+
+    with pytest.raises(ServiceException):
+        await compliance_report_update_service.handle_submitted_status(mock_report)
diff --git a/backend/lcfs/web/api/compliance_report/repo.py b/backend/lcfs/web/api/compliance_report/repo.py
index f0429c58..8211b53c 100644
--- a/backend/lcfs/web/api/compliance_report/repo.py
+++ b/backend/lcfs/web/api/compliance_report/repo.py
@@ -30,6 +30,7 @@
 from lcfs.web.api.compliance_report.schema import (
     ComplianceReportBaseSchema,
     ComplianceReportSummarySchema,
+    ComplianceReportSummaryUpdateSchema,
 )
 from lcfs.db.models.compliance.ComplianceReportHistory import ComplianceReportHistory
 from lcfs.web.core.decorators import repo_handler
@@ -532,7 +533,7 @@ async def add_compliance_report_summary(
 
     @repo_handler
     async def save_compliance_report_summary(
-        self, summary: ComplianceReportSummarySchema
+        self, summary: ComplianceReportSummaryUpdateSchema
     ):
         """
         Save the compliance report summary to the database.
@@ -667,18 +668,16 @@ async def get_issued_compliance_units(
 
     @repo_handler
     async def calculate_fuel_quantities(
-        self, compliance_report: ComplianceReport, fossil_derived: bool
+        self,
+        compliance_report_id: int,
+        effective_fuel_supplies: List[FuelSupply],
+        fossil_derived: bool,
     ) -> Dict[str, float]:
         """
         Calculate the total quantities of fuels, separated by fuel category and fossil_derived flag.
         """
         fuel_quantities = defaultdict(float)
 
-        # Get effective fuel supplies using the updated logic
-        effective_fuel_supplies = await self.fuel_supply_repo.get_effective_fuel_supplies(
-            compliance_report_group_uuid=compliance_report.compliance_report_group_uuid
-        )
-
         # Filter fuel supplies based on fossil_derived flag
         filtered_fuel_supplies = [
             fs
@@ -706,8 +705,7 @@ async def calculate_fuel_quantities(
                 OtherUses.fuel_category_id == FuelCategory.fuel_category_id,
             )
             .where(
-                OtherUses.compliance_report_id
-                == compliance_report.compliance_report_id,
+                OtherUses.compliance_report_id == compliance_report_id,
                 FuelType.fossil_derived.is_(fossil_derived),
                 FuelType.other_uses_fossil_derived.is_(fossil_derived),
             )
@@ -738,8 +736,7 @@ async def calculate_fuel_quantities(
                     == FuelCategory.fuel_category_id,
                 )
                 .where(
-                    AllocationAgreement.compliance_report_id
-                    == compliance_report.compliance_report_id,
+                    AllocationAgreement.compliance_report_id == compliance_report_id,
                     FuelType.fossil_derived.is_(False),
                     FuelType.other_uses_fossil_derived.is_(False),
                 )
diff --git a/backend/lcfs/web/api/compliance_report/schema.py b/backend/lcfs/web/api/compliance_report/schema.py
index ee66da92..d427ee7d 100644
--- a/backend/lcfs/web/api/compliance_report/schema.py
+++ b/backend/lcfs/web/api/compliance_report/schema.py
@@ -2,7 +2,7 @@
 from typing import ClassVar, Optional, List, Union
 from datetime import datetime, date
 from enum import Enum
-from lcfs.web.api.fuel_code.schema import EndUseTypeSchema,EndUserTypeSchema
+from lcfs.web.api.fuel_code.schema import EndUseTypeSchema, EndUserTypeSchema
 
 from lcfs.web.api.base import BaseSchema, FilterModel, SortOrder
 from lcfs.web.api.base import PaginationResponseSchema
@@ -26,10 +26,12 @@ class ReportingFrequency(str, Enum):
     ANNUAL = "Annual"
     QUARTERLY = "Quarterly"
 
+
 class PortsEnum(str, Enum):
     SINGLE = "Single port"
     DUAL = "Dual port"
 
+
 class CompliancePeriodSchema(BaseSchema):
     compliance_period_id: int
     description: str
@@ -185,6 +187,7 @@ class ComplianceReportSummarySchema(BaseSchema):
     renewable_fuel_target_summary: List[ComplianceReportSummaryRowSchema]
     low_carbon_fuel_target_summary: List[ComplianceReportSummaryRowSchema]
     non_compliance_penalty_summary: List[ComplianceReportSummaryRowSchema]
+    can_sign: bool = False
     summary_id: Optional[int] = None
     compliance_report_id: Optional[int] = None
     version: Optional[int] = None
@@ -192,6 +195,14 @@ class ComplianceReportSummarySchema(BaseSchema):
     quarter: Optional[int] = None
 
 
+class ComplianceReportSummaryUpdateSchema(BaseSchema):
+    compliance_report_id: int
+    renewable_fuel_target_summary: List[ComplianceReportSummaryRowSchema]
+    low_carbon_fuel_target_summary: List[ComplianceReportSummaryRowSchema]
+    non_compliance_penalty_summary: List[ComplianceReportSummaryRowSchema]
+    summary_id: int
+
+
 class CommonPaginatedReportRequestSchema(BaseSchema):
     compliance_report_id: int = Field(..., alias="complianceReportId")
     filters: Optional[List[FilterModel]] = None
diff --git a/backend/lcfs/web/api/compliance_report/summary_service.py b/backend/lcfs/web/api/compliance_report/summary_service.py
index a5f03a00..4d952153 100644
--- a/backend/lcfs/web/api/compliance_report/summary_service.py
+++ b/backend/lcfs/web/api/compliance_report/summary_service.py
@@ -9,6 +9,7 @@
 
 from lcfs.db.models.compliance.ComplianceReport import ComplianceReport
 from lcfs.db.models.compliance.ComplianceReportSummary import ComplianceReportSummary
+from lcfs.web.api.allocation_agreement.repo import AllocationAgreementRepository
 from lcfs.web.api.compliance_report.constants import (
     RENEWABLE_FUEL_TARGET_DESCRIPTIONS,
     LOW_CARBON_FUEL_TARGET_DESCRIPTIONS,
@@ -20,6 +21,7 @@
 from lcfs.web.api.compliance_report.schema import (
     ComplianceReportSummaryRowSchema,
     ComplianceReportSummarySchema,
+    ComplianceReportSummaryUpdateSchema,
 )
 from lcfs.web.api.fuel_export.repo import FuelExportRepository
 from lcfs.web.api.fuel_supply.repo import FuelSupplyRepository
@@ -42,12 +44,16 @@ def __init__(
         ),
         fuel_supply_repo: FuelSupplyRepository = Depends(FuelSupplyRepository),
         fuel_export_repo: FuelExportRepository = Depends(FuelExportRepository),
+        allocation_agreement_repo: AllocationAgreementRepository = Depends(
+            AllocationAgreementRepository
+        ),
     ):
         self.repo = repo
         self.notional_transfer_service = notional_transfer_service
         self.trxn_repo = trxn_repo
         self.fuel_supply_repo = fuel_supply_repo
         self.fuel_export_repo = fuel_export_repo
+        self.allocation_agreement_repo = allocation_agreement_repo
 
     def convert_summary_to_dict(
         self, summary_obj: ComplianceReportSummary
@@ -65,6 +71,7 @@ def convert_summary_to_dict(
             renewable_fuel_target_summary=[],
             low_carbon_fuel_target_summary=[],
             non_compliance_penalty_summary=[],
+            can_sign=False,
         )
         for column in inspector.mapper.column_attrs:
             match = re.search(r"line_(\d+)_", column.key)
@@ -218,7 +225,7 @@ def convert_summary_to_dict(
     async def update_compliance_report_summary(
         self,
         report_id: int,
-        summary_data: ComplianceReportSummarySchema,
+        summary_data: ComplianceReportSummaryUpdateSchema,
     ) -> ComplianceReportSummarySchema:
         """
         Autosave compliance report summary details for a specific summary by ID.
@@ -255,6 +262,7 @@ async def calculate_compliance_report_summary(
         # After the report has been submitted, the summary becomes locked
         # so we can return the existing summary rather than re-calculating
         if summary_model.is_locked:
+            print("LOCKED")
             return self.convert_summary_to_dict(compliance_report.summary)
 
         compliance_period_start = compliance_report.compliance_period.effective_date
@@ -307,12 +315,21 @@ async def calculate_compliance_report_summary(
             elif transfer.received_or_transferred.lower() == "transferred":
                 notional_transfers_sums[normalized_category] -= transfer.quantity
 
+        # Get effective fuel supplies using the updated logic
+        effective_fuel_supplies = await self.fuel_supply_repo.get_effective_fuel_supplies(
+            compliance_report_group_uuid=compliance_report.compliance_report_group_uuid
+        )
+
         # Fetch fuel quantities
         fossil_quantities = await self.repo.calculate_fuel_quantities(
-            compliance_report, fossil_derived=True
+            compliance_report.compliance_report_id,
+            effective_fuel_supplies,
+            fossil_derived=True,
         )
         renewable_quantities = await self.repo.calculate_fuel_quantities(
-            compliance_report, fossil_derived=False
+            compliance_report.compliance_report_id,
+            effective_fuel_supplies,
+            fossil_derived=False,
         )
 
         renewable_fuel_target_summary = self.calculate_renewable_fuel_target_summary(
@@ -338,12 +355,30 @@ async def calculate_compliance_report_summary(
 
         existing_summary = self.convert_summary_to_dict(summary_model)
 
+        fuel_export_records = await self.fuel_export_repo.get_effective_fuel_exports(
+            compliance_report.compliance_report_group_uuid
+        )
+
+        allocation_agreements = (
+            await self.allocation_agreement_repo.get_allocation_agreements(
+                compliance_report_id=compliance_report.compliance_report_id
+            )
+        )
+
+        can_sign = (
+            len(effective_fuel_supplies) > 0
+            or len(notional_transfers.notional_transfers) > 0
+            or len(fuel_export_records) > 0
+            or len(allocation_agreements) > 0
+        )
+
         summary = self.map_to_schema(
             compliance_report,
             renewable_fuel_target_summary,
             low_carbon_fuel_target_summary,
             non_compliance_penalty_summary,
             summary_model,
+            can_sign,
         )
 
         # Only save if summary has changed
@@ -361,6 +396,7 @@ def map_to_schema(
         low_carbon_fuel_target_summary,
         non_compliance_penalty_summary,
         summary_model,
+        can_sign,
     ):
         summary = ComplianceReportSummarySchema(
             summary_id=summary_model.summary_id,
@@ -371,6 +407,7 @@ def map_to_schema(
             renewable_fuel_target_summary=renewable_fuel_target_summary,
             low_carbon_fuel_target_summary=low_carbon_fuel_target_summary,
             non_compliance_penalty_summary=non_compliance_penalty_summary,
+            can_sign=can_sign,
         )
         return summary
 
diff --git a/backend/lcfs/web/api/compliance_report/update_service.py b/backend/lcfs/web/api/compliance_report/update_service.py
index 4754ba34..dd79fc6a 100644
--- a/backend/lcfs/web/api/compliance_report/update_service.py
+++ b/backend/lcfs/web/api/compliance_report/update_service.py
@@ -1,4 +1,5 @@
 from fastapi import Depends, HTTPException, Request
+from sqlalchemy.exc import InvalidRequestError
 
 from lcfs.db.models.compliance.ComplianceReport import ComplianceReport
 from lcfs.db.models.compliance.ComplianceReportStatus import ComplianceReportStatusEnum
@@ -117,6 +118,9 @@ async def handle_submitted_status(self, report: ComplianceReport):
             )
         )
 
+        if not calculated_summary.can_sign:
+            raise ServiceException("ComplianceReportSummary is not able to be signed")
+
         # If there's an existing summary, preserve user-edited values
         if existing_summary:
             for row in calculated_summary.renewable_fuel_target_summary:
@@ -177,12 +181,15 @@ async def handle_submitted_status(self, report: ComplianceReport):
             )
             # Update the report with the new summary
             report.summary = new_summary
-        # Create a new reserved transaction for receiving organization
-        report.transaction = await self.org_service.adjust_balance(
-            transaction_action=TransactionActionEnum.Reserved,
-            compliance_units=report.summary.line_20_surplus_deficit_units,
-            organization_id=report.organization_id,
-        )
+
+
+        if report.summary.line_20_surplus_deficit_units != 0:
+            # Create a new reserved transaction for receiving organization
+            report.transaction = await self.org_service.adjust_balance(
+                transaction_action=TransactionActionEnum.Reserved,
+                compliance_units=report.summary.line_20_surplus_deficit_units,
+                organization_id=report.organization_id,
+            )
         await self.repo.update_compliance_report(report)
 
         return calculated_summary
@@ -213,9 +220,11 @@ async def handle_assessed_status(self, report: ComplianceReport):
         )
         if not has_director_role:
             raise HTTPException(status_code=403, detail="Forbidden.")
-        # Update the transaction to assessed
-        report.transaction.transaction_action = TransactionActionEnum.Adjustment
-        report.transaction.update_user = user.keycloak_username
+
+        if report.transaction:
+            # Update the transaction to assessed
+            report.transaction.transaction_action = TransactionActionEnum.Adjustment
+            report.transaction.update_user = user.keycloak_username
         await self.repo.update_compliance_report(report)
 
     async def handle_reassessed_status(self, report: ComplianceReport):
diff --git a/backend/lcfs/web/api/compliance_report/views.py b/backend/lcfs/web/api/compliance_report/views.py
index 07875423..688f1788 100644
--- a/backend/lcfs/web/api/compliance_report/views.py
+++ b/backend/lcfs/web/api/compliance_report/views.py
@@ -25,7 +25,7 @@
     ComplianceReportBaseSchema,
     ComplianceReportListSchema,
     ComplianceReportSummarySchema,
-    ComplianceReportUpdateSchema,
+    ComplianceReportUpdateSchema, ComplianceReportSummaryUpdateSchema,
 )
 from lcfs.web.api.compliance_report.services import ComplianceReportServices
 from lcfs.web.api.compliance_report.summary_service import (
@@ -120,7 +120,7 @@ async def get_compliance_report_summary(
 async def update_compliance_report_summary(
     request: Request,
     report_id: int,
-    summary_data: ComplianceReportSummarySchema,
+    summary_data: ComplianceReportSummaryUpdateSchema,
     summary_service: ComplianceReportSummaryService = Depends(),
     validate: ComplianceReportValidation = Depends(),
 ) -> ComplianceReportSummarySchema:
diff --git a/frontend/src/assets/locales/en/reports.json b/frontend/src/assets/locales/en/reports.json
index ead17a17..572809e7 100644
--- a/frontend/src/assets/locales/en/reports.json
+++ b/frontend/src/assets/locales/en/reports.json
@@ -126,6 +126,7 @@
   "compareReports": "Compare summary data between the following 2 report versions",
   "fuelType": "Fuel Type",
   "signingAuthorityDeclaration": "Signing authority declaration",
+  "cannotSubmit": "You must report fuel activity information to sign and submit a report (FSE data alone is not sufficient)",
   "declarationText": "I certify that the information in this report is true and complete to the best of my knowledge and I understand that I may be required to provide to the Director records evidencing the truth of that information.",
   "submitReport": "Submit Report",
   "pleaseCheckDeclaration": "Please certify the information before submitting",
diff --git a/frontend/src/views/ComplianceReports/components/ComplianceReportSummary.jsx b/frontend/src/views/ComplianceReports/components/ComplianceReportSummary.jsx
index a752d983..76909078 100644
--- a/frontend/src/views/ComplianceReports/components/ComplianceReportSummary.jsx
+++ b/frontend/src/views/ComplianceReports/components/ComplianceReportSummary.jsx
@@ -36,6 +36,7 @@ const ComplianceReportSummary = ({
   alertRef
 }) => {
   const [summaryData, setSummaryData] = useState(null)
+  const [canSign, setCanSign] = useState(false)
   const { t } = useTranslation(['report'])
 
   const { data, isLoading, isError, error } =
@@ -63,9 +64,13 @@ const ComplianceReportSummary = ({
         data?.nonCompliancePenaltySummary[0]?.totalValue <= 0 ||
           data?.nonCompliancePenaltySummary[1].totalValue <= 0
       )
+      setCanSign(data && data.canSign)
     }
     if (isError) {
-      alertRef.current?.triggerAlert({ message: error?.response?.data?.detail || error.message, severity: 'error' })
+      alertRef.current?.triggerAlert({
+        message: error?.response?.data?.detail || error.message,
+        severity: 'error'
+      })
     }
   }, [alertRef, data, error, isError, setHasMet])
 
@@ -133,6 +138,7 @@ const ComplianceReportSummary = ({
           {currentStatus === COMPLIANCE_REPORT_STATUSES.DRAFT && (
             <>
               <SigningAuthorityDeclaration
+                disabled={!canSign}
                 onChange={setIsSigningAuthorityDeclared}
               />
               <Stack direction="row" justifyContent="flex-end" mt={2} gap={2}>
diff --git a/frontend/src/views/ComplianceReports/components/SigningAuthorityDeclaration.jsx b/frontend/src/views/ComplianceReports/components/SigningAuthorityDeclaration.jsx
index 8375a413..b285ac0a 100644
--- a/frontend/src/views/ComplianceReports/components/SigningAuthorityDeclaration.jsx
+++ b/frontend/src/views/ComplianceReports/components/SigningAuthorityDeclaration.jsx
@@ -2,8 +2,10 @@ import { useState, useEffect } from 'react'
 import { useTranslation } from 'react-i18next'
 import { Checkbox, FormControlLabel, Paper } from '@mui/material'
 import BCTypography from '@/components/BCTypography'
+import BCAlert from '@/components/BCAlert'
+import Box from '@mui/material/Box'
 
-const SigningAuthorityDeclaration = ({ onChange }) => {
+const SigningAuthorityDeclaration = ({ onChange, disabled }) => {
   const { t } = useTranslation(['report'])
   const [checked, setChecked] = useState(false)
 
@@ -28,9 +30,17 @@ const SigningAuthorityDeclaration = ({ onChange }) => {
       <BCTypography color="primary" variant="h6">
         {t('report:signingAuthorityDeclaration')}
       </BCTypography>
+      {disabled && (
+        <Box sx={{ mt: '8px' }}>
+          <BCAlert data-test="alert-box" severity="warning" noFade={true}>
+            {t('report:cannotSubmit')}
+          </BCAlert>
+        </Box>
+      )}
       <FormControlLabel
         control={
           <Checkbox
+            disabled={disabled}
             checked={checked}
             onChange={handleChange}
             id="signing-authority-declaration"