diff --git a/app/models/case_log.rb b/app/models/case_log.rb
index df91376cf..6796be006 100644
--- a/app/models/case_log.rb
+++ b/app/models/case_log.rb
@@ -191,9 +191,20 @@ class CaseLog < ApplicationRecord
     tshortfall_known == 1
   end
 
+  def is_fixed_term_tenancy?
+    [4, 6].include?(tenancy)
+  end
+
   def is_secure_tenancy?
+    return unless collection_start_year
+
     # 1: Secure (including flexible)
-    tenancy == 1
+    if collection_start_year < 2022
+      tenancy == 1
+    else
+      # 6: Secure - fixed term, 7: Secure - lifetime
+      [6, 7].include?(tenancy)
+    end
   end
 
   def is_assured_shorthold_tenancy?
@@ -461,9 +472,19 @@ private
   end
 
   def dynamically_not_required
-    previous_la_known_field = postcode_known? ? %w[previous_la_known] : []
-    tshortfall_field = tshortfall_unknown? ? %w[tshortfall] : []
-    previous_la_known_field + tshortfall_field
+    not_required = []
+    not_required << "previous_la_known" if postcode_known?
+    not_required << "tshortfall" if tshortfall_unknown?
+    not_required << "tenancylength" if tenancylength_optional?
+
+    not_required
+  end
+
+  def tenancylength_optional?
+    return false unless collection_start_year
+    return true if collection_start_year < 2022
+
+    collection_start_year >= 2022 && !is_fixed_term_tenancy?
   end
 
   def set_derived_fields!
diff --git a/config/forms/2022_2023.json b/config/forms/2022_2023.json
index 7c7c2e66b..c6ed9dcad 100644
--- a/config/forms/2022_2023.json
+++ b/config/forms/2022_2023.json
@@ -994,7 +994,7 @@
                   "hint_text": "",
                   "type": "radio",
                   "answer_options": {
-                    "1": {
+                    "4": {
                       "value": "Assured Shorthold Tenancy (AST) - Fixed term"
                     },
                     "6": {
@@ -1041,7 +1041,7 @@
                   "hint_text": "This is also known as an ‘introductory period’.",
                   "type": "radio",
                   "answer_options": {
-                    "1": {
+                    "4": {
                       "value": "Assured Shorthold Tenancy (AST) - Fixed term"
                     },
                     "6": {
@@ -1095,10 +1095,13 @@
               },
               "depends_on": [
                 {
-                  "tenancy": 1
+                  "tenancy": 4
                 },
                 {
                   "tenancy": 6
+                },
+                {
+                  "tenancy": 3
                 }
               ]
             },
@@ -6297,7 +6300,7 @@
                   "label": true,
                   "i18n_template": "la"
                 },
-                { 
+                {
                   "key": "soft_min_for_period",
                   "label": false,
                   "i18n_template": "soft_min_for_period"
@@ -6336,7 +6339,7 @@
                     "label": true,
                     "i18n_template": "la"
                   },
-                  { 
+                  {
                     "key": "soft_max_for_period",
                     "label": false,
                     "i18n_template": "soft_max_for_period"
diff --git a/spec/models/validations/tenancy_validations_spec.rb b/spec/models/validations/tenancy_validations_spec.rb
index 09b3c5314..9e80fc2d1 100644
--- a/spec/models/validations/tenancy_validations_spec.rb
+++ b/spec/models/validations/tenancy_validations_spec.rb
@@ -4,7 +4,7 @@ RSpec.describe Validations::TenancyValidations do
   subject(:tenancy_validator) { validator_class.new }
 
   let(:validator_class) { Class.new { include Validations::TenancyValidations } }
-  let(:record) { FactoryBot.create(:case_log) }
+  let(:record) { FactoryBot.create(:case_log, startdate: Time.zone.local(2021, 5, 1)) }
 
   describe "fixed term tenancy validations" do
     context "when fixed term tenancy" do
@@ -62,44 +62,134 @@ RSpec.describe Validations::TenancyValidations do
         end
       end
 
-      context "when type of tenancy is secure" do
-        let(:expected_error) { I18n.t("validations.tenancy.length.secure") }
+      context "when the collection start year is before 2022" do
+        context "when type of tenancy is secure" do
+          let(:expected_error) { I18n.t("validations.tenancy.length.secure") }
 
-        before { record.tenancy = 1 }
+          before { record.tenancy = 1 }
 
-        context "when tenancy length is greater than 1" do
-          it "adds an error" do
-            record.tenancylength = 1
-            tenancy_validator.validate_fixed_term_tenancy(record)
-            expect(record.errors["tenancylength"]).to include(match(expected_error))
-            expect(record.errors["tenancy"]).to include(match(expected_error))
+          context "when tenancy length is greater than 1" do
+            it "adds an error" do
+              record.tenancylength = 1
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to include(match(expected_error))
+              expect(record.errors["tenancy"]).to include(match(expected_error))
+            end
           end
-        end
 
-        context "when tenancy length is less than 100" do
-          it "adds an error" do
-            record.tenancylength = 100
-            tenancy_validator.validate_fixed_term_tenancy(record)
-            expect(record.errors["tenancylength"]).to include(match(expected_error))
-            expect(record.errors["tenancy"]).to include(match(expected_error))
+          context "when tenancy length is less than 100" do
+            it "adds an error" do
+              record.tenancylength = 100
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to include(match(expected_error))
+              expect(record.errors["tenancy"]).to include(match(expected_error))
+            end
+          end
+
+          context "when tenancy length is between 2-99" do
+            it "does not add an error" do
+              record.tenancylength = 3
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to be_empty
+              expect(record.errors["tenancy"]).to be_empty
+            end
+          end
+
+          context "when tenancy length has not been answered" do
+            it "does not add an error" do
+              record.tenancylength = nil
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to be_empty
+              expect(record.errors["tenancy"]).to be_empty
+            end
           end
         end
+      end
 
-        context "when tenancy length is between 2-99" do
-          it "does not add an error" do
-            record.tenancylength = 3
-            tenancy_validator.validate_fixed_term_tenancy(record)
-            expect(record.errors["tenancylength"]).to be_empty
-            expect(record.errors["tenancy"]).to be_empty
+      context "when the collection start year is 2022 or later" do
+        let(:record) { FactoryBot.create(:case_log, startdate: Time.zone.local(2022, 5, 1)) }
+
+        context "when type of tenancy is Secure - fixed term" do
+          let(:expected_error) { I18n.t("validations.tenancy.length.secure") }
+
+          before { record.tenancy = 6 }
+
+          context "when tenancy length is greater than 1" do
+            it "adds an error" do
+              record.tenancylength = 1
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to include(match(expected_error))
+              expect(record.errors["tenancy"]).to include(match(expected_error))
+            end
+          end
+
+          context "when tenancy length is less than 100" do
+            it "adds an error" do
+              record.tenancylength = 100
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to include(match(expected_error))
+              expect(record.errors["tenancy"]).to include(match(expected_error))
+            end
+          end
+
+          context "when tenancy length is between 2-99" do
+            it "does not add an error" do
+              record.tenancylength = 3
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to be_empty
+              expect(record.errors["tenancy"]).to be_empty
+            end
+          end
+
+          context "when tenancy length has not been answered" do
+            it "does not add an error" do
+              record.tenancylength = nil
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to be_empty
+              expect(record.errors["tenancy"]).to be_empty
+            end
           end
         end
 
-        context "when tenancy length has not been answered" do
-          it "does not add an error" do
-            record.tenancylength = nil
-            tenancy_validator.validate_fixed_term_tenancy(record)
-            expect(record.errors["tenancylength"]).to be_empty
-            expect(record.errors["tenancy"]).to be_empty
+        context "when type of tenancy is Secure - lifetime" do
+          let(:expected_error) { I18n.t("validations.tenancy.length.secure") }
+
+          before { record.tenancy = 7 }
+
+          context "when tenancy length is greater than 1" do
+            it "adds an error" do
+              record.tenancylength = 1
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to include(match(expected_error))
+              expect(record.errors["tenancy"]).to include(match(expected_error))
+            end
+          end
+
+          context "when tenancy length is less than 100" do
+            it "adds an error" do
+              record.tenancylength = 100
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to include(match(expected_error))
+              expect(record.errors["tenancy"]).to include(match(expected_error))
+            end
+          end
+
+          context "when tenancy length is between 2-99" do
+            it "does not add an error" do
+              record.tenancylength = 3
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to be_empty
+              expect(record.errors["tenancy"]).to be_empty
+            end
+          end
+
+          context "when tenancy length has not been answered" do
+            it "does not add an error" do
+              record.tenancylength = nil
+              tenancy_validator.validate_fixed_term_tenancy(record)
+              expect(record.errors["tenancylength"]).to be_empty
+              expect(record.errors["tenancy"]).to be_empty
+            end
           end
         end
       end
diff --git a/spec/requests/case_logs_controller_spec.rb b/spec/requests/case_logs_controller_spec.rb
index 293a3997d..3c91db3e4 100644
--- a/spec/requests/case_logs_controller_spec.rb
+++ b/spec/requests/case_logs_controller_spec.rb
@@ -239,6 +239,7 @@ RSpec.describe CaseLogsController, type: :request do
                                 owning_organisation: organisation,
                                 mrcdate: Time.zone.local(2022, 2, 1),
                                 startdate: Time.zone.local(2022, 12, 1),
+                                tenancy: 6,
                                 managing_organisation: organisation)
             end
 
@@ -267,6 +268,7 @@ RSpec.describe CaseLogsController, type: :request do
                                 owning_organisation: organisation,
                                 mrcdate: Time.zone.local(2022, 2, 1),
                                 startdate: Time.zone.local(2022, 12, 1),
+                                tenancy: 6,
                                 managing_organisation: organisation)
             end
             let!(:case_log_2022_in_progress) do
@@ -274,6 +276,7 @@ RSpec.describe CaseLogsController, type: :request do
                                 owning_organisation: organisation,
                                 mrcdate: Time.zone.local(2022, 2, 1),
                                 startdate: Time.zone.local(2022, 12, 1),
+                                tenancy: 6,
                                 managing_organisation: organisation)
             end