diff --git a/atst/forms/forms.py b/atst/forms/forms.py
index bb0d086f..4287c81c 100644
--- a/atst/forms/forms.py
+++ b/atst/forms/forms.py
@@ -30,9 +30,9 @@ class BaseForm(FlaskForm):
                     _data[field] = None
         return _data
 
-    def validate(self, *args, **kwargs):
+    def validate(self, *args, flash_invalid=True, **kwargs):
         valid = super().validate(*args, **kwargs)
-        if not valid:
+        if not valid and flash_invalid:
             flash("form_errors")
         return valid
 
diff --git a/atst/forms/task_order.py b/atst/forms/task_order.py
index fca7bcfd..80a31085 100644
--- a/atst/forms/task_order.py
+++ b/atst/forms/task_order.py
@@ -53,7 +53,11 @@ class CLINForm(FlaskForm):
 
     def validate(self, *args, **kwargs):
         valid = super().validate(*args, **kwargs)
-        if self.start_date.data > self.end_date.data:
+        if (
+            self.start_date.data
+            and self.end_date.data
+            and self.start_date.data > self.end_date.data
+        ):
             self.start_date.errors.append(
                 translate("forms.task_order.start_date_error")
             )
diff --git a/atst/routes/task_orders/new.py b/atst/routes/task_orders/new.py
index 43736e1a..9e88f8d4 100644
--- a/atst/routes/task_orders/new.py
+++ b/atst/routes/task_orders/new.py
@@ -21,8 +21,16 @@ def render_task_orders_edit(template, portfolio_id=None, task_order_id=None, for
     else:
         render_args["form"] = form or TaskOrderForm()
 
-    render_args["cancel_url"] = url_for(
-        "task_orders.portfolio_funding", portfolio_id=portfolio_id
+    render_args["cancel_save_url"] = url_for(
+        "task_orders.cancel_edit",
+        task_order_id=task_order_id,
+        portfolio_id=portfolio_id,
+        save=True,
+    )
+    render_args["cancel_discard_url"] = url_for(
+        "task_orders.cancel_edit",
+        task_order_id=task_order_id,
+        portfolio_id=portfolio_id,
     )
 
     return render_template(template, **render_args)
@@ -115,6 +123,36 @@ def submit_form_step_one_add_pdf(portfolio_id=None, task_order_id=None):
     )
 
 
+@task_orders_bp.route(
+    "/portfolios/<portfolio_id>/task_orders/form/cancel", methods=["POST"]
+)
+@task_orders_bp.route("/task_orders/<task_order_id>/form/cancel", methods=["POST"])
+@user_can(Permissions.CREATE_TASK_ORDER, message="cancel task order form")
+def cancel_edit(task_order_id=None, portfolio_id=None):
+    save = http_request.args.get("save", False)
+    if save:
+        form_data = {**http_request.form}
+        form = None
+        if task_order_id:
+            task_order = TaskOrders.get(task_order_id)
+            form = TaskOrderForm(form_data, obj=task_order)
+        else:
+            form = TaskOrderForm(form_data)
+
+        if form.validate(flash_invalid=False):
+            task_order = None
+            if task_order_id:
+                task_order = TaskOrders.update(task_order_id, **form.data)
+            else:
+                task_order = TaskOrders.create(
+                    g.current_user, portfolio_id, **form.data
+                )
+
+    return redirect(
+        url_for("task_orders.portfolio_funding", portfolio_id=g.portfolio.id)
+    )
+
+
 @task_orders_bp.route("/task_orders/<task_order_id>/form/step_2")
 @user_can(Permissions.CREATE_TASK_ORDER, message="view task order form")
 def form_step_two_add_number(task_order_id):
diff --git a/styles/sections/_task_order.scss b/styles/sections/_task_order.scss
index f9604e17..eb801826 100644
--- a/styles/sections/_task_order.scss
+++ b/styles/sections/_task_order.scss
@@ -249,3 +249,12 @@
     }
   }
 }
+
+.task-order__modal-cancel {
+  text-align: center;
+}
+
+.task-order__modal-cancel_buttons {
+  display: flex;
+  justify-content: center;
+}
diff --git a/templates/task_orders/builder_base.html b/templates/task_orders/builder_base.html
index 3b571459..0f4848f2 100644
--- a/templates/task_orders/builder_base.html
+++ b/templates/task_orders/builder_base.html
@@ -1,6 +1,7 @@
 {% extends "portfolios/base.html" %}
 
 {% from "components/sticky_cta.html" import StickyCTA %}
+{% from "components/modal.html" import Modal %}
 
 {% block portfolio_content %}
   <base-form inline-template>
@@ -26,13 +27,23 @@
           {% endif %}
 
           <a
-            href="{{ cancel_url }}"
+            v-on:click="openModal('cancel')"
             class="action-group__action icon-link">
             {{ "common.cancel" | translate }}
           </a>
         </span>
       {% endcall %}
 
+      {% call Modal(name='cancel', dismissable=True) %}
+        <div class="task-order__modal-cancel">
+          <h1>Do you want to save this draft?</h1>
+          <div class="task-order__modal-cancel_buttons">
+            <button formaction="{{ cancel_discard_url }}" class="usa-button usa-button-primary" type="submit">No, delete it</button>
+            <button formaction="{{ cancel_save_url }}" class="usa-button usa-button-primary" type="submit">Yes, save for later</button>
+          </div>
+        </div>
+      {% endcall %}
+
       {% include "fragments/flash.html" %}
 
       <div class="task-order">
diff --git a/templates/task_orders/step_1.html b/templates/task_orders/step_1.html
index 21b38aac..e81ad47c 100644
--- a/templates/task_orders/step_1.html
+++ b/templates/task_orders/step_1.html
@@ -12,7 +12,6 @@
 {% endif %}
 
 {% set next_button_text = "Next: Add TO Number" %}
-{% set previous_button_link = cancel_url %}
 {% set step = "1" %}
 
 
diff --git a/tests/routes/task_orders/test_new.py b/tests/routes/task_orders/test_new.py
index b88bbf7b..0ab8a2bc 100644
--- a/tests/routes/task_orders/test_new.py
+++ b/tests/routes/task_orders/test_new.py
@@ -1,20 +1,12 @@
 import pytest
-from flask import url_for
+from flask import url_for, get_flashed_messages
 from datetime import timedelta, date
 
-from atst.domain.permission_sets import PermissionSets
 from atst.domain.task_orders import TaskOrders
 from atst.models.task_order import Status as TaskOrderStatus
-from atst.models import Attachment, TaskOrder
-from atst.utils.localization import translate
+from atst.models import TaskOrder
 
-from tests.factories import (
-    CLINFactory,
-    PortfolioFactory,
-    PortfolioRoleFactory,
-    TaskOrderFactory,
-    UserFactory,
-)
+from tests.factories import CLINFactory, PortfolioFactory, TaskOrderFactory, UserFactory
 
 
 @pytest.fixture
@@ -326,6 +318,72 @@ def test_task_orders_edit_redirects_to_latest_incomplete_step(
     assert expected_step in response.location
 
 
+def test_can_cancel_edit_and_save_task_order(client, user_session, task_order, session):
+    user_session(task_order.portfolio.owner)
+    response = client.post(
+        url_for("task_orders.cancel_edit", task_order_id=task_order.id, save=True),
+        data={"number": "7896564324567"},
+    )
+    assert response.status_code == 302
+
+    updated_task_order = session.query(TaskOrder).get(task_order.id)
+    assert updated_task_order.number == "7896564324567"
+
+
+def test_cancel_can_create_new_to(client, user_session, portfolio):
+    user_session(portfolio.owner)
+    response = client.post(
+        url_for("task_orders.cancel_edit", portfolio_id=portfolio.id),
+        data={"number": "7643906432984"},
+    )
+    assert response.status_code == 302
+
+
+def test_cancel_edit_does_not_save_invalid_form_input(client, user_session, session):
+    task_order = TaskOrderFactory.create()
+    user_session(task_order.portfolio.owner)
+    bad_data = {"clins-0-jedi_clin_type": "foo"}
+    response = client.post(
+        url_for("task_orders.cancel_edit", task_order_id=task_order.id, save=True),
+        data=bad_data,
+    )
+    assert response.status_code == 302
+
+    # CLINs should be unchanged
+    updated_task_order = session.query(TaskOrder).get(task_order.id)
+    assert updated_task_order.clins == task_order.clins
+
+
+def test_cancel_edit_on_invalid_input_does_not_flash(
+    app, client, user_session, session
+):
+    task_order = TaskOrderFactory.create()
+    user_session(task_order.portfolio.owner)
+
+    bad_data = {"clins-0-jedi_clin_type": "foo"}
+
+    response = client.post(
+        url_for("task_orders.cancel_edit", task_order_id=task_order.id, save=True),
+        data=bad_data,
+    )
+
+    assert len(get_flashed_messages()) == 0
+
+
+def test_cancel_edit_without_saving(client, user_session, session):
+    task_order = TaskOrderFactory.create(number=None)
+    user_session(task_order.portfolio.owner)
+    response = client.post(
+        url_for("task_orders.cancel_edit", task_order_id=task_order.id),
+        data={"number": "7643906432984"},
+    )
+    assert response.status_code == 302
+
+    # TO number should be unchanged
+    updated_task_order = session.query(TaskOrder).get(task_order.id)
+    assert updated_task_order.number is None
+
+
 @pytest.mark.skip(reason="Reevaluate how form handles invalid data")
 def test_task_orders_update_invalid_data(client, user_session, portfolio):
     user_session(portfolio.owner)