diff --git a/app/models/validations/financial_validations.rb b/app/models/validations/financial_validations.rb
index 7396465e7..defc4eedf 100644
--- a/app/models/validations/financial_validations.rb
+++ b/app/models/validations/financial_validations.rb
@@ -41,6 +41,15 @@ module Validations::FinancialValidations
             message: I18n.t("validations.financial.ecstat.over_hard_max", earnings: format_as_currency(record.earnings), frequency:),
           )
         end
+        (2..8).each do |n|
+          next unless record["ecstat#{n}"] == 9
+
+          record.errors.add(
+            "age#{n}",
+            :over_hard_max,
+            message: I18n.t("validations.financial.ecstat.inferred_child.over_hard_max", earnings: format_as_currency(record.earnings), frequency:),
+          )
+        end
       end
 
       if record.weekly_net_income < record.applicable_income_range.hard_min
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 24e3d8f7f..5b35aaae8 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -377,6 +377,8 @@ en:
         out_of_range: "Enter a value for the %{charge_name} between £0 and %{maximum_per_period} paid %{frequency}. %{maximum_per_period} is the max limit for rent and charges paid %{frequency} for %{letting_type} lettings owned by a %{provider_type}."
       ecstat:
         over_hard_max: "The household's income of %{earnings} %{frequency} is too high given the household’s working situation"
+        inferred_child:
+          over_hard_max: "The household's income of %{earnings} %{frequency} is too high given the household’s characteristics and working situation"
       brent:
         below_hard_min: "Rent is below the absolute minimum expected for a property of this type. Please check the rent, rent period, local authority and (if general needs) number of bedrooms"
         above_hard_max: "Rent is higher than the absolute maximum expected for a property of this type. Please check the rent, rent period, local authority and (if general needs) number of bedrooms"
diff --git a/spec/models/validations/financial_validations_spec.rb b/spec/models/validations/financial_validations_spec.rb
index f3265e830..38d0b4138 100644
--- a/spec/models/validations/financial_validations_spec.rb
+++ b/spec/models/validations/financial_validations_spec.rb
@@ -244,18 +244,23 @@ RSpec.describe Validations::FinancialValidations do
           .to eq(["The household's income cannot be less than £150.00 per week given the household’s working situation"])
       end
 
-      it "adds errors to all tenant ecstat fields when income is too high" do
+      it "adds errors to relevant fields for each tenant when income is too high" do
         record.earnings = 5000
         record.incfreq = 1
         record.hhmemb = 3
         record.ecstat1 = 1
         record.ecstat2 = 2
+        record.age3 = 12
         record.ecstat3 = 9
         financial_validator.validate_net_income(record)
-        (1..8).each do |n|
+        (1..record.hhmemb).each do |n|
           expect(record.errors["ecstat#{n}"])
             .to eq(["The household's income of £5,000.00 weekly is too high given the household’s working situation"])
         end
+        expect(record.errors["age1"]).to be_empty
+        expect(record.errors["age2"]).to be_empty
+        expect(record.errors["age3"])
+          .to eq(["The household's income of £5,000.00 weekly is too high given the household’s characteristics and working situation"])
       end
     end
   end