diff --git a/app/models/validations/shared_validations.rb b/app/models/validations/shared_validations.rb
index 79fc95158..f3b0a9c34 100644
--- a/app/models/validations/shared_validations.rb
+++ b/app/models/validations/shared_validations.rb
@@ -16,6 +16,16 @@ module Validations::SharedValidations
     end
   end
 
+  def validate_numeric_input(record)
+    record.form.numeric_questions.each do |question|
+      next unless record[question.id] && question.page.routed_to?(record, nil)
+      next if record.send("#{question.id}_before_type_cast").to_s.match?(/\A\d+(\.\d+)?\z/)
+
+      field = question.check_answer_label || question.id
+      record.errors.add question.id.to_sym, I18n.t("validations.numeric.format", field:)
+    end
+  end
+
   def validate_numeric_min_max(record)
     record.form.numeric_questions.each do |question|
       next unless question.min || question.max
diff --git a/app/views/form/_numeric_question.html.erb b/app/views/form/_numeric_question.html.erb
index aafa68d93..aa147767b 100644
--- a/app/views/form/_numeric_question.html.erb
+++ b/app/views/form/_numeric_question.html.erb
@@ -1,6 +1,6 @@
 <%= render partial: "form/guidance/#{question.top_guidance_partial}" if question.top_guidance? %>
 
-<%= f.govuk_number_field(
+<%= f.govuk_text_field(
   question.id.to_sym,
   caption: caption(caption_text, page_header, conditional),
   label: legend(question, page_header, conditional),
@@ -13,6 +13,8 @@
   prefix_text: question.prefix.to_s,
   suffix_text: question.suffix_label(@log),
   value: format_money_input(log: @log, question:),
+  inputmode: "numeric",
+  pattern: "\d*\.?\d*",
   **stimulus_html_attributes(question),
 ) %>
 
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 51ddfdc36..35e2fcd96 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -231,6 +231,7 @@ en:
       nearest_ten: "%{field} must be given to the nearest ten"
       nearest_hundredth: "%{field} must be given to the nearest hundredth"
       normal_format: "Enter a number"
+      format: "%{field} must be a number"
 
     date:
       invalid_date: "Enter a date in the correct format, for example 31 1 2022"
diff --git a/spec/models/validations/shared_validations_spec.rb b/spec/models/validations/shared_validations_spec.rb
index 97cb621cb..fb389d175 100644
--- a/spec/models/validations/shared_validations_spec.rb
+++ b/spec/models/validations/shared_validations_spec.rb
@@ -215,4 +215,36 @@ RSpec.describe Validations::SharedValidations do
       end
     end
   end
+
+  describe "validate numeric question input" do
+    it "does not allow letters" do
+      sales_log.income1 = "abc"
+      shared_validator.validate_numeric_input(sales_log)
+      expect(sales_log.errors[:income1]).to include I18n.t("validations.numeric.format", field: "Buyer 1’s gross annual income")
+    end
+
+    it "does not allow special characters" do
+      sales_log.income1 = "3%5"
+      shared_validator.validate_numeric_input(sales_log)
+      expect(sales_log.errors[:income1]).to include I18n.t("validations.numeric.format", field: "Buyer 1’s gross annual income")
+    end
+
+    it "allows a digit" do
+      sales_log.income1 = "300"
+      shared_validator.validate_numeric_input(sales_log)
+      expect(sales_log.errors[:income1]).to be_empty
+    end
+
+    it "allows a decimal point" do
+      sales_log.income1 = "300.78"
+      shared_validator.validate_numeric_input(sales_log)
+      expect(sales_log.errors[:income1]).to be_empty
+    end
+
+    it "does not allow decimal point in a wrong format" do
+      sales_log.income1 = "300.09.78"
+      shared_validator.validate_numeric_input(sales_log)
+      expect(sales_log.errors[:income1]).to include I18n.t("validations.numeric.format", field: "Buyer 1’s gross annual income")
+    end
+  end
 end