diff --git a/ihatemoney/tests/budget_test.py b/ihatemoney/tests/budget_test.py
index 093d9d17..e0e56afd 100644
--- a/ihatemoney/tests/budget_test.py
+++ b/ihatemoney/tests/budget_test.py
@@ -870,6 +870,122 @@ class TestBudget(IhatemoneyTestCase):
         balance = self.get_project("raclette").balance
         assert set(balance.values()) == set([6, -6])
 
+    def test_edit_bill_with_deactivated_member(self):
+        """
+        Bills involving deactivated members should not allowed to be edited or deleted.
+        """
+        self.post_project("raclette")
+
+        # add two participants
+        self.client.post("/raclette/members/add", data={"name": "zorglub"})
+        self.client.post("/raclette/members/add", data={"name": "fred"})
+
+        members_ids = [m.id for m in self.get_project("raclette").members]
+
+        # create one bill
+        self.client.post(
+            "/raclette/add",
+            data={
+                "date": "2011-08-10",
+                "what": "fromage à raclette",
+                "payer": members_ids[0],
+                "payed_for": members_ids,
+                "amount": "25",
+            },
+        )
+        bill = models.Bill.query.one()
+        self.assertEqual(bill.amount, 25)
+
+        # deactivate one user
+        self.client.post(
+            "/raclette/members/%s/delete" % self.get_project("raclette").members[-1].id
+        )
+        self.assertEqual(len(self.get_project("raclette").members), 2)
+        self.assertEqual(len(self.get_project("raclette").active_members), 1)
+
+        # editing would fail because the bill involves deactivated user
+        self.client.post(
+            f"/raclette/edit/{bill.id}",
+            data={
+                "date": "2011-08-10",
+                "what": "fromage à raclette",
+                "payer": members_ids[0],
+                "payed_for": members_ids,
+                "amount": "10",
+            },
+        )
+        bill = models.Bill.query.one()
+        self.assertNotEqual(bill.amount, 10, "bill edition")
+
+        # reactivate the user
+        self.client.post(
+            "/raclette/members/%s/reactivate"
+            % self.get_project("raclette").members[-1].id
+        )
+        self.assertEqual(len(self.get_project("raclette").active_members), 2)
+
+        # try to edit the bill again. It should succeed
+        self.client.post(
+            f"/raclette/edit/{bill.id}",
+            data={
+                "date": "2011-08-10",
+                "what": "fromage à raclette",
+                "payer": members_ids[0],
+                "payed_for": members_ids,
+                "amount": "10",
+            },
+        )
+        bill = models.Bill.query.one()
+        self.assertEqual(bill.amount, 10, "bill edition")
+
+    def test_delete_bill_with_deactivated_member(self):
+        """
+        Bills involving deactivated members should not allowed to be edited or deleted.
+        """
+        self.post_project("raclette")
+
+        # add two participants
+        self.client.post("/raclette/members/add", data={"name": "zorglub"})
+        self.client.post("/raclette/members/add", data={"name": "fred"})
+
+        members_ids = [m.id for m in self.get_project("raclette").members]
+
+        # create one bill
+        self.client.post(
+            "/raclette/add",
+            data={
+                "date": "2011-08-10",
+                "what": "fromage à raclette",
+                "payer": members_ids[0],
+                "payed_for": members_ids,
+                "amount": "25",
+            },
+        )
+        bill = models.Bill.query.one()
+        self.assertEqual(bill.amount, 25)
+
+        # deactivate one user
+        self.client.post(
+            "/raclette/members/%s/delete" % self.get_project("raclette").members[-1].id
+        )
+        self.assertEqual(len(self.get_project("raclette").active_members), 1)
+
+        # deleting should fail because the bill involves deactivated user
+        response = self.client.get(f"/raclette/delete/{bill.id}")
+        self.assertEqual(response.status_code, 405)
+        self.assertEqual(1, len(models.Bill.query.all()), "bill deletion")
+
+        # reactivate the user
+        self.client.post(
+            "/raclette/members/%s/reactivate"
+            % self.get_project("raclette").members[-1].id
+        )
+        self.assertEqual(len(self.get_project("raclette").active_members), 2)
+
+        # try to delete the bill again. It should succeed
+        self.client.post(f"/raclette/delete/{bill.id}")
+        self.assertEqual(0, len(models.Bill.query.all()), "bill deletion")
+
     def test_trimmed_members(self):
         self.post_project("raclette")
 
diff --git a/ihatemoney/web.py b/ihatemoney/web.py
index 0d0bdd20..a3f44389 100644
--- a/ihatemoney/web.py
+++ b/ihatemoney/web.py
@@ -800,6 +800,19 @@ def delete_bill(bill_id):
     if not bill:
         return redirect(url_for(".list_bills"))
 
+    # Prevent deleting if the bill involves deactivated user.
+    active_member_id = [m.id for m in g.project.active_members]
+    owers_id = [int(m.id) for m in bill.owers]
+    deactivated_members = set([bill.payer_id] + owers_id).difference(
+        set(active_member_id)
+    )
+    if len(deactivated_members):
+        flash(
+            _("Deactivated users involved. This bill cannot be deleted."),
+            category="warning",
+        )
+        return redirect(url_for(".list_bills"))
+
     db.session.delete(bill)
     db.session.commit()
     flash(_("The bill has been deleted"))
@@ -816,6 +829,19 @@ def edit_bill(bill_id):
 
     form = get_billform_for(g.project, set_default=False)
 
+    # Prevent editing if the bill involves deactivated user.
+    active_member_id = [m.id for m in g.project.active_members]
+    owers_id = [int(m.id) for m in bill.owers]
+    deactivated_members = set([bill.payer_id] + owers_id).difference(
+        set(active_member_id)
+    )
+    if len(deactivated_members):
+        flash(
+            _("Deactivated users involved. This bill cannot be edited."),
+            category="warning",
+        )
+        return redirect(url_for(".list_bills"))
+
     if request.method == "POST" and form.validate():
         form.save(bill, g.project)
         db.session.commit()