diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index f6086a918..98517058e 100644
--- a/app/models/sales_log.rb
+++ b/app/models/sales_log.rb
@@ -279,11 +279,17 @@ class SalesLog < Log
     mortgage_amount + deposit_amount + cashdis_amount
   end
 
+  def value_times_equity
+    return unless value && equity
+
+    value * equity / 100
+  end
+
   def mortgage_deposit_and_discount_error_fields
     [
       "mortgage",
       "deposit",
-      cashdis.present? ? "discount" : nil,
+      cashdis.present? ? "cash discount" : nil,
     ].compact.to_sentence
   end
 
diff --git a/app/models/validations/sales/financial_validations.rb b/app/models/validations/sales/financial_validations.rb
index 410f6d250..59b84f7e3 100644
--- a/app/models/validations/sales/financial_validations.rb
+++ b/app/models/validations/sales/financial_validations.rb
@@ -92,6 +92,23 @@ module Validations::Sales::FinancialValidations
     end
   end
 
+  def validate_shared_ownership_deposit(record)
+    return unless record.saledate && record.form.start_year_after_2024?
+    return unless record.mortgage || record.mortgageused == 2 || record.mortgageused == 3
+    return unless record.cashdis && record.deposit && record.value && record.equity
+
+    mortgage_value = record.mortgage || 0
+
+    if mortgage_value + record.deposit + record.cashdis != record.value * record.equity / 100
+      %i[mortgage value deposit ownershipsch cashdis equity].each do |field|
+        record.errors.add field, I18n.t("validations.financial.shared_ownership_deposit",
+                                        mortgage_deposit_and_discount_error_fields: record.mortgage_deposit_and_discount_error_fields,
+                                        mortgage_deposit_and_discount_total: record.field_formatted_as_currency("mortgage_deposit_and_discount_total"),
+                                        value_times_equity: record.field_formatted_as_currency("value_times_equity"))
+      end
+    end
+  end
+
 private
 
   def is_relationship_child?(relationship)
diff --git a/app/models/validations/sales/soft_validations.rb b/app/models/validations/sales/soft_validations.rb
index d8d957988..fce544754 100644
--- a/app/models/validations/sales/soft_validations.rb
+++ b/app/models/validations/sales/soft_validations.rb
@@ -84,6 +84,7 @@ module Validations::Sales::SoftValidations
   end
 
   def shared_ownership_deposit_invalid?
+    return unless saledate && collection_start_year <= 2023
     return unless mortgage || mortgageused == 2 || mortgageused == 3
     return unless cashdis || !is_type_discount?
     return unless deposit && value && equity
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 8a3e8cd77..2a8d86951 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -433,6 +433,7 @@ en:
         under_min: "The minimum initial equity stake for this type of shared ownership sale is %{min_equity}%"
         over_max: "The maximum initial equity stake is %{max_equity}%"
       mortgage: "Mortgage value cannot be £0 if a mortgage was used for the purchase of this property"
+      shared_ownership_deposit: "The %{mortgage_deposit_and_discount_error_fields} added together is %{mortgage_deposit_and_discount_total}. The value times the equity percentage is %{value_times_equity}. These figures should be the same"
 
     household:
       reasonable_preference_reason:
diff --git a/spec/models/validations/sales/financial_validations_spec.rb b/spec/models/validations/sales/financial_validations_spec.rb
index 68cf19a14..295b11c2c 100644
--- a/spec/models/validations/sales/financial_validations_spec.rb
+++ b/spec/models/validations/sales/financial_validations_spec.rb
@@ -339,4 +339,179 @@ RSpec.describe Validations::Sales::FinancialValidations do
       end
     end
   end
+
+  describe "#validate_shared_ownership_deposit" do
+    let(:record) { FactoryBot.create(:sales_log, saledate: now) }
+
+    around do |example|
+      Timecop.freeze(now) do
+        Singleton.__init__(FormHandler)
+        example.run
+      end
+      Timecop.return
+    end
+
+    context "with a log in the 24/25 collection year" do
+      let(:now) { Time.zone.local(2024, 4, 2) }
+
+      it "does not add an error if MORTGAGE + DEPOSIT + CASHDIS are equal VALUE * EQUITY/100" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to be_empty
+        expect(record.errors["deposit"]).to be_empty
+        expect(record.errors["cashdis"]).to be_empty
+        expect(record.errors["value"]).to be_empty
+        expect(record.errors["equity"]).to be_empty
+      end
+
+      it "does not add an error if mortgage is used and no mortgage is given" do
+        record.mortgage = nil
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to be_empty
+        expect(record.errors["deposit"]).to be_empty
+        expect(record.errors["cashdis"]).to be_empty
+        expect(record.errors["value"]).to be_empty
+        expect(record.errors["equity"]).to be_empty
+      end
+
+      it "adds an error if mortgage is not used and no mortgage is given" do
+        record.mortgage = nil
+        record.mortgageused = 2
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to include("The mortgage, deposit, and cash discount added together is £2,000.00. The value times the equity percentage is £3,000.00. These figures should be the same")
+        expect(record.errors["deposit"]).to include("The mortgage, deposit, and cash discount added together is £2,000.00. The value times the equity percentage is £3,000.00. These figures should be the same")
+        expect(record.errors["cashdis"]).to include("The mortgage, deposit, and cash discount added together is £2,000.00. The value times the equity percentage is £3,000.00. These figures should be the same")
+        expect(record.errors["value"]).to include("The mortgage, deposit, and cash discount added together is £2,000.00. The value times the equity percentage is £3,000.00. These figures should be the same")
+        expect(record.errors["equity"]).to include("The mortgage, deposit, and cash discount added together is £2,000.00. The value times the equity percentage is £3,000.00. These figures should be the same")
+      end
+
+      it "does not add an error if no deposit is given" do
+        record.mortgage = 1000
+        record.deposit = nil
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to be_empty
+        expect(record.errors["deposit"]).to be_empty
+        expect(record.errors["cashdis"]).to be_empty
+        expect(record.errors["value"]).to be_empty
+        expect(record.errors["equity"]).to be_empty
+      end
+
+      it "does not add an error if no cashdis is given and cashdis is routed to" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.type = 18
+        record.cashdis = nil
+        record.value = 3000
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to be_empty
+        expect(record.errors["deposit"]).to be_empty
+        expect(record.errors["cashdis"]).to be_empty
+        expect(record.errors["value"]).to be_empty
+        expect(record.errors["equity"]).to be_empty
+      end
+
+      it "does not add an error if no cashdis is given and cashdis is not routed to" do
+        record.mortgageused = 1
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.type = 2
+        record.cashdis = nil
+        record.value = 3000
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to be_empty
+        expect(record.errors["deposit"]).to be_empty
+        expect(record.errors["cashdis"]).to be_empty
+        expect(record.errors["value"]).to be_empty
+        expect(record.errors["equity"]).to be_empty
+      end
+
+      it "does not add an error if no value is given" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = nil
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to be_empty
+        expect(record.errors["deposit"]).to be_empty
+        expect(record.errors["cashdis"]).to be_empty
+        expect(record.errors["value"]).to be_empty
+        expect(record.errors["equity"]).to be_empty
+      end
+
+      it "does not add an error if no equity is given" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = nil
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to be_empty
+        expect(record.errors["deposit"]).to be_empty
+        expect(record.errors["cashdis"]).to be_empty
+        expect(record.errors["value"]).to be_empty
+        expect(record.errors["equity"]).to be_empty
+      end
+
+      it "adds an error if MORTGAGE + DEPOSIT + CASHDIS are not equal VALUE * EQUITY/100" do
+        record.mortgageused = 1
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 4323
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to include("The mortgage, deposit, and cash discount added together is £3,000.00. The value times the equity percentage is £4,323.00. These figures should be the same")
+        expect(record.errors["deposit"]).to include("The mortgage, deposit, and cash discount added together is £3,000.00. The value times the equity percentage is £4,323.00. These figures should be the same")
+        expect(record.errors["cashdis"]).to include("The mortgage, deposit, and cash discount added together is £3,000.00. The value times the equity percentage is £4,323.00. These figures should be the same")
+        expect(record.errors["value"]).to include("The mortgage, deposit, and cash discount added together is £3,000.00. The value times the equity percentage is £4,323.00. These figures should be the same")
+        expect(record.errors["equity"]).to include("The mortgage, deposit, and cash discount added together is £3,000.00. The value times the equity percentage is £4,323.00. These figures should be the same")
+      end
+    end
+
+    context "with a log in 23/24 collection year" do
+      let(:now) { Time.zone.local(2024, 1, 1) }
+
+      it "does not add an error if MORTGAGE + DEPOSIT + CASHDIS are not equal VALUE * EQUITY/100" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 4323
+        record.equity = 100
+
+        financial_validator.validate_shared_ownership_deposit(record)
+        expect(record.errors["mortgage"]).to be_empty
+        expect(record.errors["deposit"]).to be_empty
+        expect(record.errors["cashdis"]).to be_empty
+        expect(record.errors["value"]).to be_empty
+        expect(record.errors["equity"]).to be_empty
+      end
+    end
+  end
 end
diff --git a/spec/models/validations/sales/soft_validations_spec.rb b/spec/models/validations/sales/soft_validations_spec.rb
index 4d0c1024a..6b9817277 100644
--- a/spec/models/validations/sales/soft_validations_spec.rb
+++ b/spec/models/validations/sales/soft_validations_spec.rb
@@ -400,6 +400,10 @@ RSpec.describe Validations::Sales::SoftValidations do
     end
 
     context "when validating shared ownership deposit" do
+      before do
+        record.saledate = Time.zone.local(2023, 4, 3)
+      end
+
       it "returns false if MORTGAGE + DEPOSIT + CASHDIS are equal VALUE * EQUITY/100" do
         record.mortgage = 1000
         record.deposit = 1000
@@ -501,6 +505,18 @@ RSpec.describe Validations::Sales::SoftValidations do
         expect(record)
           .to be_shared_ownership_deposit_invalid
       end
+
+      it "returns false if startyear is after 2024" do
+        record.saledate = Time.zone.local(2025, 1, 1)
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 4323
+        record.equity = 100
+
+        expect(record)
+          .not_to be_shared_ownership_deposit_invalid
+      end
     end
   end
 
diff --git a/spec/services/bulk_upload/sales/year2024/row_parser_spec.rb b/spec/services/bulk_upload/sales/year2024/row_parser_spec.rb
index 9ecf31d21..5280c5be2 100644
--- a/spec/services/bulk_upload/sales/year2024/row_parser_spec.rb
+++ b/spec/services/bulk_upload/sales/year2024/row_parser_spec.rb
@@ -989,18 +989,6 @@ RSpec.describe BulkUpload::Sales::Year2024::RowParser do
           expect(parser.errors.where(:field_31, category: :soft_validation).first.message).to eql("You told us this person is aged 22 years and retired.")
         end
       end
-
-      context "when a soft validation is triggered that relates both to fields that are and are not routed to" do
-        let(:attributes) { valid_attributes.merge({ field_101: "300000" }) }
-
-        it "adds errors to fields that are routed to" do
-          expect(parser.errors.where(:field_101, category: :soft_validation)).to be_present
-        end
-
-        it "does not add errors to fields that are not routed to" do
-          expect(parser.errors.where(:field_112, category: :soft_validation)).not_to be_present
-        end
-      end
     end
   end