diff --git a/app/models/validations/sales/sale_information_validations.rb b/app/models/validations/sales/sale_information_validations.rb
index 81054e830..024272ac3 100644
--- a/app/models/validations/sales/sale_information_validations.rb
+++ b/app/models/validations/sales/sale_information_validations.rb
@@ -47,7 +47,7 @@ module Validations::Sales::SaleInformationValidations
     return unless record.mortgage || record.mortgageused == 2 || record.mortgageused == 3
     return unless record.discount || record.grant || record.type == 29
 
-    if record.mortgage_deposit_and_grant_total != record.value_with_discount && record.discounted_ownership_sale?
+    if over_tolerance?(record.mortgage_deposit_and_grant_total, record.value_with_discount, 1) && record.discounted_ownership_sale?
       %i[mortgageused mortgage value deposit ownershipsch discount grant].each do |field|
         record.errors.add field, I18n.t("validations.sale_information.discounted_ownership_value", mortgage_deposit_and_grant_total: record.field_formatted_as_currency("mortgage_deposit_and_grant_total"), value_with_discount: record.field_formatted_as_currency("value_with_discount"))
       end
diff --git a/spec/models/validations/sales/sale_information_validations_spec.rb b/spec/models/validations/sales/sale_information_validations_spec.rb
index 4da297f53..4859aca2d 100644
--- a/spec/models/validations/sales/sale_information_validations_spec.rb
+++ b/spec/models/validations/sales/sale_information_validations_spec.rb
@@ -235,21 +235,83 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
         end
 
         context "and is provided" do
-          it "returns true if mortgage, deposit and grant total does not equal market value" do
-            record.grant = 3_000
+          it "adds an error if mortgage, deposit and grant at least 1 greater than discounted value" do
+            record.mortgage = 30_000
+            record.deposit = 5_000
+            record.grant = 15_000
+            record.value = 99_998
+            record.discount = 50
+            sale_information_validator.validate_discounted_ownership_value(record)
+            expect(record.errors["mortgageused"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £49,999.00. These figures should be the same")
+            expect(record.errors["mortgage"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £49,999.00. These figures should be the same")
+            expect(record.errors["value"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £49,999.00. These figures should be the same")
+            expect(record.errors["deposit"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £49,999.00. These figures should be the same")
+            expect(record.errors["ownershipsch"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £49,999.00. These figures should be the same")
+            expect(record.errors["discount"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £49,999.00. These figures should be the same")
+            expect(record.errors["grant"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £49,999.00. These figures should be the same")
+          end
+
+          it "adds an error if mortgage, deposit and grant at least 1 less than discounted value" do
+            record.mortgage = 30_000
+            record.deposit = 5_000
+            record.grant = 15_000
+            record.value = 100_002
+            record.discount = 50
+            sale_information_validator.validate_discounted_ownership_value(record)
+            expect(record.errors["mortgageused"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £50,001.00. These figures should be the same")
+            expect(record.errors["mortgage"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £50,001.00. These figures should be the same")
+            expect(record.errors["value"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £50,001.00. These figures should be the same")
+            expect(record.errors["deposit"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £50,001.00. These figures should be the same")
+            expect(record.errors["ownershipsch"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £50,001.00. These figures should be the same")
+            expect(record.errors["discount"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £50,001.00. These figures should be the same")
+            expect(record.errors["grant"]).to include("The mortgage, deposit, and grant when added together is £50,000.00, and the purchase purchase price times by the discount is £50,001.00. These figures should be the same")
+          end
+
+          it "does not add an error if mortgage, deposit and grant less than 1 greater than discounted value" do
+            record.mortgage = 30_000
+            record.deposit = 5_000
+            record.grant = 15_000
+            record.value = 99_999
+            record.discount = 50
+
+            sale_information_validator.validate_discounted_ownership_value(record)
+
+            expect(record.errors["mortgageused"]).to be_empty
+            expect(record.errors["mortgage"]).to be_empty
+            expect(record.errors["value"]).to be_empty
+            expect(record.errors["deposit"]).to be_empty
+            expect(record.errors["ownershipsch"]).to be_empty
+            expect(record.errors["discount"]).to be_empty
+            expect(record.errors["grant"]).to be_empty
+          end
+
+          it "does not add an error if mortgage, deposit and grant less than 1 less than discounted value" do
+            record.mortgage = 30_000
+            record.deposit = 5_000
+            record.grant = 15_000
+            record.value = 100_001
+            record.discount = 50
+
             sale_information_validator.validate_discounted_ownership_value(record)
-            expect(record.errors["mortgageused"]).to include("The mortgage, deposit, and grant when added together is £18,000.00, and the purchase purchase price times by the discount is £30,000.00. These figures should be the same")
-            expect(record.errors["mortgage"]).to include("The mortgage, deposit, and grant when added together is £18,000.00, and the purchase purchase price times by the discount is £30,000.00. These figures should be the same")
-            expect(record.errors["value"]).to include("The mortgage, deposit, and grant when added together is £18,000.00, and the purchase purchase price times by the discount is £30,000.00. These figures should be the same")
-            expect(record.errors["deposit"]).to include("The mortgage, deposit, and grant when added together is £18,000.00, and the purchase purchase price times by the discount is £30,000.00. These figures should be the same")
-            expect(record.errors["ownershipsch"]).to include("The mortgage, deposit, and grant when added together is £18,000.00, and the purchase purchase price times by the discount is £30,000.00. These figures should be the same")
-            expect(record.errors["discount"]).to include("The mortgage, deposit, and grant when added together is £18,000.00, and the purchase purchase price times by the discount is £30,000.00. These figures should be the same")
-            expect(record.errors["grant"]).to include("The mortgage, deposit, and grant when added together is £18,000.00, and the purchase purchase price times by the discount is £30,000.00. These figures should be the same")
+
+            expect(record.errors["mortgageused"]).to be_empty
+            expect(record.errors["mortgage"]).to be_empty
+            expect(record.errors["value"]).to be_empty
+            expect(record.errors["deposit"]).to be_empty
+            expect(record.errors["ownershipsch"]).to be_empty
+            expect(record.errors["discount"]).to be_empty
+            expect(record.errors["grant"]).to be_empty
           end
 
-          it "returns false if mortgage, deposit and grant total equals market value" do
+          it "does not add an error if mortgage, deposit and grant total equals discounted value" do
+            record.mortgage = 30_000
+            record.deposit = 5_000
             record.grant = 15_000
+            record.value = 100_000
+            record.discount = 50
+
             sale_information_validator.validate_discounted_ownership_value(record)
+
             expect(record.errors["mortgageused"]).to be_empty
             expect(record.errors["mortgage"]).to be_empty
             expect(record.errors["value"]).to be_empty