diff --git a/src/registrar/admin.py b/src/registrar/admin.py
index 4a34ac0f8..3ad5e3ea0 100644
--- a/src/registrar/admin.py
+++ b/src/registrar/admin.py
@@ -41,8 +41,6 @@ from django.core.exceptions import ObjectDoesNotExist
 from django.contrib.admin.widgets import FilteredSelectMultiple
 from django.utils.html import format_html
 from django.utils.translation import gettext_lazy as _
-from django.shortcuts import get_object_or_404, render
-from django.urls import path
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/registrar/config/settings.py b/src/registrar/config/settings.py
index d1f8d2384..7965424bc 100644
--- a/src/registrar/config/settings.py
+++ b/src/registrar/config/settings.py
@@ -357,14 +357,18 @@ CSP_FORM_ACTION = allowed_sources
 # and inline with a nonce, as well as allowing connections back to their domain.
 # Note: If needed, we can embed chart.js instead of using the CDN
 CSP_DEFAULT_SRC = ("'self'",)
-CSP_STYLE_SRC = ["'self'", "https://www.ssa.gov/accessibility/andi/andi.css", "https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css"]
+CSP_STYLE_SRC = [
+    "'self'",
+    "https://www.ssa.gov/accessibility/andi/andi.css",
+    "https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css",
+]
 CSP_SCRIPT_SRC_ELEM = [
     "'self'",
     "https://www.googletagmanager.com/",
     "https://cdn.jsdelivr.net/npm/chart.js",
     "https://www.ssa.gov",
     "https://ajax.googleapis.com",
-    "https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"
+    "https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js",
 ]
 CSP_CONNECT_SRC = ["'self'", "https://www.google-analytics.com/", "https://www.ssa.gov/accessibility/andi/andi.js"]
 CSP_INCLUDE_NONCE_IN = ["script-src-elem", "style-src"]
diff --git a/src/registrar/config/urls.py b/src/registrar/config/urls.py
index ee32930f1..0a8e00350 100644
--- a/src/registrar/config/urls.py
+++ b/src/registrar/config/urls.py
@@ -130,7 +130,7 @@ urlpatterns = [
         AnalyticsView.as_view(),
         name="analytics",
     ),
-    path('admin/registrar/user/<int:user_id>/transfer/', TransferUserView.as_view(), name='transfer_user'),
+    path("admin/registrar/user/<int:user_id>/transfer/", TransferUserView.as_view(), name="transfer_user"),
     path(
         "admin/api/get-senior-official-from-federal-agency-json/",
         get_senior_official_from_federal_agency_json,
diff --git a/src/registrar/tests/test_admin.py b/src/registrar/tests/test_admin.py
index 827742ef1..f051325a6 100644
--- a/src/registrar/tests/test_admin.py
+++ b/src/registrar/tests/test_admin.py
@@ -45,6 +45,7 @@ from registrar.models import (
 from registrar.models.portfolio_invitation import PortfolioInvitation
 from registrar.models.senior_official import SeniorOfficial
 from registrar.models.user_domain_role import UserDomainRole
+from registrar.models.utility.portfolio_helper import UserPortfolioPermissionChoices, UserPortfolioRoleChoices
 from registrar.models.verified_by_staff import VerifiedByStaff
 from .common import (
     MockDbForSharedTests,
@@ -60,7 +61,8 @@ from .common import (
 )
 from django.contrib.sessions.backends.db import SessionStore
 from django.contrib.auth import get_user_model
-from unittest.mock import patch, Mock
+from unittest.mock import ANY, patch, Mock
+from django_webtest import WebTest  # type: ignore
 
 import logging
 
@@ -2121,3 +2123,224 @@ class TestPortfolioAdmin(TestCase):
         self.assertIn("request1.gov", domain_requests)
         self.assertIn("request2.gov", domain_requests)
         self.assertIn('<ul class="add-list-reset">', domain_requests)
+
+
+class TestTransferUser(WebTest):
+    """User transfer custom admin page"""
+
+    # csrf checks do not work well with WebTest.
+    # We disable them here.
+    csrf_checks = False
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.site = AdminSite()
+        cls.superuser = create_superuser()
+        cls.admin = PortfolioAdmin(model=Portfolio, admin_site=cls.site)
+        cls.factory = RequestFactory()
+
+    def setUp(self):
+        self.app.set_user(self.superuser)
+        self.user1, _ = User.objects.get_or_create(
+            username="madmax", first_name="Max", last_name="Rokatanski", title="Road warrior"
+        )
+        self.user2, _ = User.objects.get_or_create(
+            username="furiosa", first_name="Furiosa", last_name="Jabassa", title="Imperator"
+        )
+
+    def tearDown(self):
+        Suborganization.objects.all().delete()
+        DomainInformation.objects.all().delete()
+        DomainRequest.objects.all().delete()
+        Domain.objects.all().delete()
+        Portfolio.objects.all().delete()
+        UserDomainRole.objects.all().delete()
+
+    @less_console_noise_decorator
+    def test_transfer_user_shows_current_and_selected_user_information(self):
+        """Assert we pull the current user info and display it on the transfer page"""
+        completed_domain_request(user=self.user1, name="wasteland.gov")
+        domain_request = completed_domain_request(
+            user=self.user1, name="citadel.gov", status=DomainRequest.DomainRequestStatus.SUBMITTED
+        )
+        domain_request.status = DomainRequest.DomainRequestStatus.APPROVED
+        domain_request.save()
+
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+
+        self.assertContains(user_transfer_page, "madmax")
+        self.assertContains(user_transfer_page, "Max")
+        self.assertContains(user_transfer_page, "Rokatanski")
+        self.assertContains(user_transfer_page, "Road warrior")
+        self.assertContains(user_transfer_page, "wasteland.gov")
+        self.assertContains(user_transfer_page, "citadel.gov")
+
+        select_form = user_transfer_page.forms[0]
+        select_form["selected_user"] = str(self.user2.id)
+        preview_result = select_form.submit()
+
+        self.assertContains(preview_result, "furiosa")
+        self.assertContains(preview_result, "Furiosa")
+        self.assertContains(preview_result, "Jabassa")
+        self.assertContains(preview_result, "Imperator")
+
+    @less_console_noise_decorator
+    def test_transfer_user_transfers_portfolio_roles_and_permissions_and_portfolio_creator(self):
+        """Assert that a portfolio gets copied over
+        NOTE: Should be revised for #2644"""
+        portfolio = Portfolio.objects.create(organization_name="Citadel", creator=self.user2)
+        self.user2.portfolio = portfolio
+        self.user2.portfolio_roles = [UserPortfolioRoleChoices.ORGANIZATION_ADMIN]
+        self.user2.portfolio_additional_permissions = [
+            UserPortfolioPermissionChoices.VIEW_PORTFOLIO,
+            UserPortfolioPermissionChoices.EDIT_PORTFOLIO,
+        ]
+        self.user2.save()
+
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+
+        submit_form = user_transfer_page.forms[1]
+        submit_form["selected_user"] = self.user2.pk
+        submit_form.submit()
+
+        self.user1.refresh_from_db()
+        portfolio.refresh_from_db()
+
+        self.assertEquals(portfolio.creator, self.user1)
+        self.assertEquals(self.user1.portfolio, portfolio)
+        self.assertEquals(self.user1.portfolio_roles, [UserPortfolioRoleChoices.ORGANIZATION_ADMIN])
+        self.assertEquals(
+            self.user1.portfolio_additional_permissions,
+            [UserPortfolioPermissionChoices.VIEW_PORTFOLIO, UserPortfolioPermissionChoices.EDIT_PORTFOLIO],
+        )
+
+    @less_console_noise_decorator
+    def test_transfer_user_transfers_domain_request_creator_and_investigator(self):
+        """Assert that domain request fields get transferred"""
+        domain_request = completed_domain_request(user=self.user2, name="wasteland.gov", investigator=self.user2)
+
+        self.assertEquals(domain_request.creator, self.user2)
+        self.assertEquals(domain_request.investigator, self.user2)
+
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+        submit_form = user_transfer_page.forms[1]
+        submit_form["selected_user"] = self.user2.pk
+        submit_form.submit()
+        domain_request.refresh_from_db()
+
+        self.assertEquals(domain_request.creator, self.user1)
+        self.assertEquals(domain_request.investigator, self.user1)
+
+    @less_console_noise_decorator
+    def test_transfer_user_transfers_domain_information_creator(self):
+        """Assert that domain fields get transferred"""
+        domain_information, _ = DomainInformation.objects.get_or_create(creator=self.user2)
+
+        self.assertEquals(domain_information.creator, self.user2)
+
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+        submit_form = user_transfer_page.forms[1]
+        submit_form["selected_user"] = self.user2.pk
+        submit_form.submit()
+        domain_information.refresh_from_db()
+
+        self.assertEquals(domain_information.creator, self.user1)
+
+    @less_console_noise_decorator
+    def test_transfer_user_transfers_domain_role(self):
+        """Assert that user domain role get transferred"""
+        domain_1, _ = Domain.objects.get_or_create(name="chrome.gov", state=Domain.State.READY)
+        domain_2, _ = Domain.objects.get_or_create(name="v8.gov", state=Domain.State.READY)
+        user_domain_role1, _ = UserDomainRole.objects.get_or_create(
+            user=self.user2, domain=domain_1, role=UserDomainRole.Roles.MANAGER
+        )
+        user_domain_role2, _ = UserDomainRole.objects.get_or_create(
+            user=self.user2, domain=domain_2, role=UserDomainRole.Roles.MANAGER
+        )
+
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+        submit_form = user_transfer_page.forms[1]
+        submit_form["selected_user"] = self.user2.pk
+        submit_form.submit()
+        user_domain_role1.refresh_from_db()
+        user_domain_role2.refresh_from_db()
+
+        self.assertEquals(user_domain_role1.user, self.user1)
+        self.assertEquals(user_domain_role2.user, self.user1)
+
+    @less_console_noise_decorator
+    def test_transfer_user_transfers_verified_by_staff_requestor(self):
+        """Assert that verified by staff creator gets transferred"""
+        vip, _ = VerifiedByStaff.objects.get_or_create(requestor=self.user2, email="immortan.joe@citadel.com")
+
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+        submit_form = user_transfer_page.forms[1]
+        submit_form["selected_user"] = self.user2.pk
+        submit_form.submit()
+        vip.refresh_from_db()
+
+        self.assertEquals(vip.requestor, self.user1)
+
+    @less_console_noise_decorator
+    def test_transfer_user_deletes_old_user(self):
+        """Assert that the slected user gets deleted"""
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+        submit_form = user_transfer_page.forms[1]
+        submit_form["selected_user"] = self.user2.pk
+        submit_form.submit()
+        # Refresh user2 from the database and check if it still exists
+        with self.assertRaises(User.DoesNotExist):
+            self.user2.refresh_from_db()
+
+    @less_console_noise_decorator
+    def test_transfer_user_throws_transfer_and_delete_success_messages(self):
+        """Test that success messages for data transfer and user deletion are displayed."""
+        # Ensure the setup for VerifiedByStaff
+        VerifiedByStaff.objects.get_or_create(requestor=self.user2, email="immortan.joe@citadel.com")
+
+        # Access the transfer user page
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+
+        with patch("django.contrib.messages.success") as mock_success_message:
+
+            # Fill the form with the selected user and submit
+            submit_form = user_transfer_page.forms[1]
+            submit_form["selected_user"] = self.user2.pk
+            after_submit = submit_form.submit().follow()
+
+            self.assertContains(after_submit, "<h1>Change user</h1>")
+
+            mock_success_message.assert_any_call(
+                ANY,
+                (
+                    "Data transferred successfully for the following objects: ['Changed requestor "
+                    + 'from "Furiosa Jabassa " to "Max Rokatanski " on immortan.joe@citadel.com\']'
+                ),
+            )
+
+            mock_success_message.assert_any_call(ANY, f"Deleted {self.user2} {self.user2.username}")
+
+    @less_console_noise_decorator
+    def test_transfer_user_throws_error_message(self):
+        """Test that an error message is thrown if the transfer fails."""
+        with patch(
+            "registrar.views.TransferUserView.transfer_user_fields_and_log", side_effect=Exception("Simulated Error")
+        ):
+            with patch("django.contrib.messages.error") as mock_error:
+                # Access the transfer user page
+                user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+
+                # Fill the form with the selected user and submit
+                submit_form = user_transfer_page.forms[1]
+                submit_form["selected_user"] = self.user2.pk
+                submit_form.submit().follow()
+
+                # Assert that the error message was called with the correct argument
+                mock_error.assert_called_once_with(ANY, "An error occurred during the transfer: Simulated Error")
+
+    @less_console_noise_decorator
+    def test_transfer_user_modal(self):
+        """Assert modal on page"""
+        user_transfer_page = self.app.get(reverse("transfer_user", args=[self.user1.pk]))
+        self.assertContains(user_transfer_page, "But you know what you're doing, right?")
diff --git a/src/registrar/views/__init__.py b/src/registrar/views/__init__.py
index f6e87dd07..2b830d958 100644
--- a/src/registrar/views/__init__.py
+++ b/src/registrar/views/__init__.py
@@ -19,3 +19,4 @@ from .user_profile import UserProfileView, FinishProfileSetupView
 from .health import *
 from .index import *
 from .portfolios import *
+from .transfer_user import TransferUserView
diff --git a/src/registrar/views/transfer_user.py b/src/registrar/views/transfer_user.py
index 5e367f04d..cc901d5ab 100644
--- a/src/registrar/views/transfer_user.py
+++ b/src/registrar/views/transfer_user.py
@@ -15,57 +15,60 @@ from registrar.models.verified_by_staff import VerifiedByStaff
 
 logger = logging.getLogger(__name__)
 
+
 class TransferUserView(View):
     """Transfer user methods that set up the transfer_user template and handle the forms on it."""
 
     JOINS = [
-        (DomainRequest, 'creator'),
-        (DomainInformation, 'creator'),
-        (Portfolio, 'creator'),
-        (DomainRequest, 'investigator'),
-        (UserDomainRole, 'user'),
-        (VerifiedByStaff, 'requestor'),
+        (DomainRequest, "creator"),
+        (DomainInformation, "creator"),
+        (Portfolio, "creator"),
+        (DomainRequest, "investigator"),
+        (UserDomainRole, "user"),
+        (VerifiedByStaff, "requestor"),
     ]
 
-    USER_FIELDS = ['portfolio', 'portfolio_roles', 'portfolio_additional_permissions']
+    USER_FIELDS = ["portfolio", "portfolio_roles", "portfolio_additional_permissions"]
 
     def get(self, request, user_id):
         """current_user referes to the 'source' user where the button that redirects to this view was clicked.
         other_users exclude current_user and populate a dropdown, selected_user is the selection in the dropdown.
-        
+
         This also querries the relevant domains and domain requests, and the admin context needed for the sidenav."""
 
         current_user = get_object_or_404(User, pk=user_id)
-        other_users = User.objects.exclude(pk=user_id).order_by('first_name', 'last_name')  # Exclude the current user from the dropdown
+        other_users = User.objects.exclude(pk=user_id).order_by(
+            "first_name", "last_name"
+        )  # Exclude the current user from the dropdown
 
         # Get the default admin site context, needed for the sidenav
         admin_context = site.each_context(request)
 
         context = {
-            'current_user': current_user,
-            'other_users': other_users,
-            'logged_in_user': request.user,
+            "current_user": current_user,
+            "other_users": other_users,
+            "logged_in_user": request.user,
             **admin_context,  # Include the admin context
-            'current_user_domains': self.get_domains(current_user),
-            'current_user_domain_requests': self.get_domain_requests(current_user)
+            "current_user_domains": self.get_domains(current_user),
+            "current_user_domain_requests": self.get_domain_requests(current_user),
         }
 
-        selected_user_id = request.GET.get('selected_user')
+        selected_user_id = request.GET.get("selected_user")
         if selected_user_id:
             selected_user = get_object_or_404(User, pk=selected_user_id)
-            context['selected_user'] = selected_user
-            context['selected_user_domains'] = self.get_domains(selected_user)
-            context['selected_user_domain_requests'] = self.get_domain_requests(selected_user)
+            context["selected_user"] = selected_user
+            context["selected_user_domains"] = self.get_domains(selected_user)
+            context["selected_user_domain_requests"] = self.get_domain_requests(selected_user)
 
-        return render(request, 'admin/transfer_user.html', context)
+        return render(request, "admin/transfer_user.html", context)
 
     def post(self, request, user_id):
         """This handles the transfer from selected_user to current_user then deletes selected_user.
-        
+
         NOTE: We have a ticket to refactor this into a more solid lookup for related fields in #2645"""
 
         current_user = get_object_or_404(User, pk=user_id)
-        selected_user_id = request.POST.get('selected_user')
+        selected_user_id = request.POST.get("selected_user")
         selected_user = get_object_or_404(User, pk=selected_user_id)
 
         try:
@@ -89,53 +92,52 @@ class TransferUserView(View):
         except Exception as e:
             messages.error(request, f"An error occurred during the transfer: {e}")
 
-        return redirect('admin:registrar_user_change', object_id=user_id)
+        return redirect("admin:registrar_user_change", object_id=user_id)
 
     @classmethod
-    def update_joins_and_log(cls, model_class, field_name, old_user, new_user, change_logs):
+    def update_joins_and_log(cls, model_class, field_name, selected_user, current_user, change_logs):
         """
         Helper function to update the user join fields for a given model and log the changes.
         """
 
-        filter_kwargs = {field_name: old_user}
+        filter_kwargs = {field_name: selected_user}
         updated_objects = model_class.objects.filter(**filter_kwargs)
 
         for obj in updated_objects:
             # Check for duplicate UserDomainRole before updating
             if model_class == UserDomainRole:
-                if model_class.objects.filter(user=new_user, domain=obj.domain).exists():
+                if model_class.objects.filter(user=current_user, domain=obj.domain).exists():
                     continue  # Skip the update to avoid a duplicate
 
             # Update the field on the object and save it
-            setattr(obj, field_name, new_user)
+            setattr(obj, field_name, current_user)
             obj.save()
 
             # Log the change
-            cls.log_change(obj, field_name, old_user, new_user, change_logs)
+            cls.log_change(obj, field_name, selected_user, current_user, change_logs)
 
     @classmethod
-    def transfer_user_fields_and_log(cls, old_user, new_user, change_logs):
+    def transfer_user_fields_and_log(cls, selected_user, current_user, change_logs):
         """
-        Transfers portfolio fields from the old_user to the new_user.
+        Transfers portfolio fields from the selected_user to the current_user.
         Logs the changes for each transferred field.
 
         NOTE: This will be refactored in #2644
         """
-
         for field in cls.USER_FIELDS:
-            old_value = getattr(old_user, field, None)
+            field_value = getattr(selected_user, field, None)
 
-            if old_value:
-                setattr(new_user, field, old_value)
-                cls.log_change(new_user, field, old_value, old_value, change_logs)
+            if field_value:
+                setattr(current_user, field, field_value)
+                cls.log_change(current_user, field, field_value, field_value, change_logs)
 
-        new_user.save()
+        current_user.save()
 
     @classmethod
-    def log_change(cls, obj, field_name, old_value, new_value, change_logs):
+    def log_change(cls, obj, field_name, field_value, new_value, change_logs):
         """Logs the change for a specific field on an object"""
-        log_entry = f'Changed {field_name} from "{old_value}" to "{new_value}" on {obj}'
-        
+        log_entry = f'Changed {field_name} from "{field_value}" to "{new_value}" on {obj}'
+
         logger.info(log_entry)
 
         # Collect the related object for the success message
@@ -149,10 +151,10 @@ class TransferUserView(View):
         domains = Domain.objects.filter(id__in=domain_ids)
 
         return domains
-    
+
     @classmethod
     def get_domain_requests(cls, user):
         """A simplified version of domain_requests_json"""
         domain_requests = DomainRequest.objects.filter(creator=user)
 
-        return domain_requests
\ No newline at end of file
+        return domain_requests