diff --git a/core/src/main/java/it/pagopa/selfcare/onboarding/core/InstitutionServiceImpl.java b/core/src/main/java/it/pagopa/selfcare/onboarding/core/InstitutionServiceImpl.java
index b4d42c64..87421cfb 100644
--- a/core/src/main/java/it/pagopa/selfcare/onboarding/core/InstitutionServiceImpl.java
+++ b/core/src/main/java/it/pagopa/selfcare/onboarding/core/InstitutionServiceImpl.java
@@ -11,6 +11,7 @@
 import it.pagopa.selfcare.onboarding.connector.model.InstitutionOnboardingData;
 import it.pagopa.selfcare.onboarding.connector.model.RecipientCodeStatusResult;
 import it.pagopa.selfcare.onboarding.connector.model.institutions.*;
+import it.pagopa.selfcare.onboarding.connector.model.institutions.infocamere.BusinessInfoIC;
 import it.pagopa.selfcare.onboarding.connector.model.institutions.infocamere.InstitutionInfoIC;
 import it.pagopa.selfcare.onboarding.connector.model.onboarding.GeographicTaxonomy;
 import it.pagopa.selfcare.onboarding.connector.model.onboarding.InstitutionLocation;
@@ -70,6 +71,7 @@ class InstitutionServiceImpl implements InstitutionService {
     private static final String REQUIRED_AGGREGATE_INSTITUTIONS = "Aggregate institutions are required if given institution is an Aggregator";
 
     private static final String ONBOARDING_COMPANY_NOT_ALLOWED = "The selected business does not belong to the user";
+    private final static String PROD_PNPG = "prod-pnpg";
     static final String DESCRIPTION_TO_REPLACE_REGEX = " - COMUNE";
     private final OnboardingMsConnector onboardingMsConnector;
     private final PartyConnector partyConnector;
@@ -79,7 +81,6 @@ class InstitutionServiceImpl implements InstitutionService {
     private final OnboardingValidationStrategy onboardingValidationStrategy;
     private final PartyRegistryProxyConnector partyRegistryProxyConnector;
     private final InstitutionInfoMapper institutionMapper;
-
     @Autowired
     InstitutionServiceImpl(OnboardingMsConnector onboardingMsConnector, PartyConnector partyConnector,
                            ProductsConnector productsConnector,
@@ -479,12 +480,49 @@ private void validateOnboarding(String externalInstitutionId, String productId)
     public InstitutionInfoIC getInstitutionsByUser(String fiscalCode) {
         log.trace("getInstitutionsByUserId start");
         log.debug(LogUtils.CONFIDENTIAL_MARKER, "getInstitutionsByUserId user = {}", fiscalCode);
+
         InstitutionInfoIC result = partyRegistryProxyConnector.getInstitutionsByUserFiscalCode(fiscalCode);
+        log.debug("found {} institutions for the user", result.getBusinesses().size());
+
+        List<BusinessInfoIC> institutionsNotOnboardedByUser = result.getBusinesses().stream()
+                .filter(businessInfoIC -> !isOnboardedByUser(businessInfoIC, fiscalCode))
+                .toList();
+
+        result.setBusinesses(institutionsNotOnboardedByUser);
         log.debug(LogUtils.CONFIDENTIAL_MARKER, "getInstitutionsByUserId result = {}", result);
         log.trace("getInstitutionsByUserId end");
         return result;
     }
 
+    private boolean isOnboardedByUser(BusinessInfoIC businessInfoIC, String fiscalCode) {
+        log.debug(LogUtils.CONFIDENTIAL_MARKER, "Checking if business with tax code {} is onboarded by user with fiscal code {}",
+                businessInfoIC.getBusinessTaxId(), fiscalCode);
+        try {
+            onboardingMsConnector.verifyOnboarding(PROD_PNPG, businessInfoIC.getBusinessTaxId(), null, null, null);
+            log.debug("Business with tax code {} is already onboarded, checking if user with fiscal code {} is manager",
+                    businessInfoIC.getBusinessTaxId(), fiscalCode);
+
+            boolean isManager = onboardingMsConnector.checkManager(getOnboardingData(fiscalCode, businessInfoIC));
+            log.debug(LogUtils.CONFIDENTIAL_MARKER, "User with fiscal code {} is manager of business with tax code {}",
+                    fiscalCode, businessInfoIC.getBusinessTaxId());
+            return isManager;
+        } catch (ResourceNotFoundException e) {
+            log.debug("Business with tax code {} is not onboarded", businessInfoIC.getBusinessTaxId());
+            return false;
+        }
+    }
+
+    private OnboardingData getOnboardingData(String fiscalCode, BusinessInfoIC businessInfoIC) {
+        OnboardingData onboardingData = new OnboardingData();
+        User user = new User();
+        user.setTaxCode(fiscalCode);
+        user.setRole(PartyRole.MANAGER);
+        onboardingData.setUsers(List.of(user));
+        onboardingData.setTaxCode(businessInfoIC.getBusinessTaxId());
+        onboardingData.setProductId(PROD_PNPG);
+        return onboardingData;
+    }
+
     @Override
     public List<Institution> getByFilters(String productId, String taxCode, String origin, String originId, String subunitCode) {
         log.trace("getByFilters start");
diff --git a/core/src/test/java/it/pagopa/selfcare/onboarding/core/InstitutionServiceImplTest.java b/core/src/test/java/it/pagopa/selfcare/onboarding/core/InstitutionServiceImplTest.java
index 672b3a88..930b4999 100644
--- a/core/src/test/java/it/pagopa/selfcare/onboarding/core/InstitutionServiceImplTest.java
+++ b/core/src/test/java/it/pagopa/selfcare/onboarding/core/InstitutionServiceImplTest.java
@@ -1276,7 +1276,7 @@ void verifyOnboardingInfo_allowed() {
     }
 
     @Test
-    void getInstitutionsByUser_default() {
+    void getInstitutionsByUser_default_notOnboarded() {
         //given
         String taxCode = "setTaxCode";
         SaveUserDto saveUserDto = mockInstance(new SaveUserDto(), "setFiscalCode");
@@ -1289,6 +1289,38 @@ void getInstitutionsByUser_default() {
         institutionInfoICmock.setBusinesses(businessInfoICSmock);
         when(partyRegistryProxyConnectorMock.getInstitutionsByUserFiscalCode(anyString()))
                 .thenReturn(institutionInfoICmock);
+        doThrow(new ResourceNotFoundException()).when(onboardingMsConnector)
+                .verifyOnboarding(any(), any(), any(), any(), any());
+        //when
+        InstitutionInfoIC result = institutionService.getInstitutionsByUser(user.getTaxCode());
+        //then
+        assertNotNull(result);
+        assertEquals(institutionInfoICmock.getBusinesses().get(0).getBusinessName(), result.getBusinesses().get(0).getBusinessName());
+        assertEquals(institutionInfoICmock.getBusinesses().get(0).getBusinessTaxId(), result.getBusinesses().get(0).getBusinessTaxId());
+        assertEquals(institutionInfoICmock.getLegalTaxId(), result.getLegalTaxId());
+        assertEquals(institutionInfoICmock.getRequestDateTime(), result.getRequestDateTime());
+        verify(partyRegistryProxyConnectorMock, times(1))
+                .getInstitutionsByUserFiscalCode(taxCode);
+        verifyNoMoreInteractions(partyRegistryProxyConnectorMock);
+        verifyNoMoreInteractions(userConnectorMock);
+    }
+
+    @Test
+    void getInstitutionsByUser_default_onboarded() {
+        //given
+        String taxCode = "setTaxCode";
+        SaveUserDto saveUserDto = mockInstance(new SaveUserDto(), "setFiscalCode");
+        saveUserDto.setFiscalCode(taxCode);
+        UserId userId = mockInstance(new UserId());
+        User user = mockInstance(new User(), "setId");
+        user.setId(userId.toString());
+        List<BusinessInfoIC> businessInfoICSmock = List.of(mockInstance(new BusinessInfoIC()));
+        InstitutionInfoIC institutionInfoICmock = mockInstance(new InstitutionInfoIC(), "setBusinesses");
+        institutionInfoICmock.setBusinesses(businessInfoICSmock);
+        when(partyRegistryProxyConnectorMock.getInstitutionsByUserFiscalCode(anyString()))
+                .thenReturn(institutionInfoICmock);
+        doNothing().when(onboardingMsConnector).verifyOnboarding(any(), any(), any(), any(), any());
+        when(onboardingMsConnector.checkManager(any())).thenReturn(false);
         //when
         InstitutionInfoIC result = institutionService.getInstitutionsByUser(user.getTaxCode());
         //then