diff --git a/atst/routes/portfolios/task_orders.py b/atst/routes/portfolios/task_orders.py
index a0b539b4..4efac824 100644
--- a/atst/routes/portfolios/task_orders.py
+++ b/atst/routes/portfolios/task_orders.py
@@ -85,12 +85,15 @@ def ko_review(portfolio_id, task_order_id):
 
     Authorization.check_is_ko_or_cor(g.current_user, task_order)
 
-    return render_template(
-        "/portfolios/task_orders/review.html",
-        portfolio=portfolio,
-        task_order=task_order,
-        form=KOReviewForm(obj=task_order),
-    )
+    if TaskOrders.all_sections_complete(task_order):
+        return render_template(
+            "/portfolios/task_orders/review.html",
+            portfolio=portfolio,
+            task_order=task_order,
+            form=KOReviewForm(obj=task_order),
+        )
+    else:
+        raise NotFoundError("task_order")
 
 
 @portfolios_bp.route(
diff --git a/templates/portfolios/task_orders/show.html b/templates/portfolios/task_orders/show.html
index c5468a24..0aaa4cd4 100644
--- a/templates/portfolios/task_orders/show.html
+++ b/templates/portfolios/task_orders/show.html
@@ -32,7 +32,7 @@
         </div>
       </div>
       <div class="task-order-next-steps__action col">
-        {% if not task_order.is_active and button_text and button_url %}
+        {% if not task_order.is_active and complete and button_text and button_url %}
           <a
             href="{{ button_url }}"
             class="usa-button usa-button-primary">
diff --git a/tests/routes/portfolios/test_task_orders.py b/tests/routes/portfolios/test_task_orders.py
index 0636df2e..73430512 100644
--- a/tests/routes/portfolios/test_task_orders.py
+++ b/tests/routes/portfolios/test_task_orders.py
@@ -308,6 +308,22 @@ def test_ko_can_view_ko_review_page(client, user_session):
     assert response.status_code == 404
 
 
+def test_cor_cant_view_review_until_to_completed(client, user_session):
+    portfolio = PortfolioFactory.create()
+    user_session(portfolio.owner)
+    task_order = TaskOrderFactory.create(
+        portfolio=portfolio, clin_01=None, cor_dod_id=portfolio.owner.dod_id
+    )
+    response = client.get(
+        url_for(
+            "portfolios.ko_review",
+            portfolio_id=portfolio.id,
+            task_order_id=task_order.id,
+        )
+    )
+    assert response.status_code == 404
+
+
 def test_mo_redirected_to_build_page(client, user_session):
     portfolio = PortfolioFactory.create()
     user_session(portfolio.owner)