diff --git a/app/models/form/sales/questions/mortgage_amount.rb b/app/models/form/sales/questions/mortgage_amount.rb
index 81549c011..b0faf22cf 100644
--- a/app/models/form/sales/questions/mortgage_amount.rb
+++ b/app/models/form/sales/questions/mortgage_amount.rb
@@ -4,6 +4,7 @@ class Form::Sales::Questions::MortgageAmount < ::Form::Question
     @id = "mortgage"
     @type = "numeric"
     @min = 1
+    @max = form.start_year_2026_or_later? ? 999_999 : nil
     @step = 1
     @width = 5
     @prefix = "£"
diff --git a/app/models/form/sales/questions/purchase_price.rb b/app/models/form/sales/questions/purchase_price.rb
index 24aecd7ec..3d559a3bb 100644
--- a/app/models/form/sales/questions/purchase_price.rb
+++ b/app/models/form/sales/questions/purchase_price.rb
@@ -4,6 +4,7 @@ class Form::Sales::Questions::PurchasePrice < ::Form::Question
     @id = "value"
     @type = "numeric"
     @min = form.start_year_2026_or_later? ? 15_000 : 0
+    @max = form.start_year_2026_or_later? ? 999_999 : nil
     @step = 0.01
     @width = 5
     @prefix = "£"
diff --git a/app/models/form/sales/questions/value.rb b/app/models/form/sales/questions/value.rb
index 0884a3fb6..9e6a6dec7 100644
--- a/app/models/form/sales/questions/value.rb
+++ b/app/models/form/sales/questions/value.rb
@@ -5,6 +5,7 @@ class Form::Sales::Questions::Value < ::Form::Question
     @copy_key = form.start_year_2025_or_later? ? "sales.sale_information.value.#{page.id}" : "sales.sale_information.value"
     @type = "numeric"
     @min = form.start_year_2026_or_later? ? 15_000 : 0
+    @max = form.start_year_2026_or_later? ? 999_999 : nil
     @step = 1
     @width = 10
     @prefix = "£"
diff --git a/spec/models/form/sales/questions/mortgage_amount_spec.rb b/spec/models/form/sales/questions/mortgage_amount_spec.rb
index 12da4bc1f..d6ed4d740 100644
--- a/spec/models/form/sales/questions/mortgage_amount_spec.rb
+++ b/spec/models/form/sales/questions/mortgage_amount_spec.rb
@@ -5,7 +5,8 @@ RSpec.describe Form::Sales::Questions::MortgageAmount, type: :model do
 
   let(:question_id) { nil }
   let(:question_definition) { nil }
-  let(:page) { instance_double(Form::Page, subsection: instance_double(Form::Subsection, id: "shared_ownership_initial_purchase", form: instance_double(Form, start_date: Time.zone.local(2023, 4, 1), start_year_2026_or_later?: false))) }
+  let(:start_year_2026_or_later?) { false }
+  let(:page) { instance_double(Form::Page, subsection: instance_double(Form::Subsection, id: "shared_ownership_initial_purchase", form: instance_double(Form, start_date: Time.zone.local(2023, 4, 1), start_year_2026_or_later?: start_year_2026_or_later?))) }
 
   it "has correct page" do
     expect(question.page).to be(page)
@@ -50,4 +51,28 @@ RSpec.describe Form::Sales::Questions::MortgageAmount, type: :model do
       expect(question).not_to be_derived(log)
     end
   end
+
+  context "with year 2025", metadata: { year: 25 } do
+    let(:start_year_2026_or_later?) { false }
+
+    it "has correct min" do
+      expect(question.min).to eq(1)
+    end
+
+    it "has correct max" do
+      expect(question.max).to be_nil
+    end
+  end
+
+  context "with year 2026", metadata: { year: 26 } do
+    let(:start_year_2026_or_later?) { true }
+
+    it "has correct min" do
+      expect(question.min).to eq(1)
+    end
+
+    it "has correct max" do
+      expect(question.max).to eq(999_999)
+    end
+  end
 end
diff --git a/spec/models/form/sales/questions/purchase_price_spec.rb b/spec/models/form/sales/questions/purchase_price_spec.rb
index 47081edb4..ac50668aa 100644
--- a/spec/models/form/sales/questions/purchase_price_spec.rb
+++ b/spec/models/form/sales/questions/purchase_price_spec.rb
@@ -65,6 +65,10 @@ RSpec.describe Form::Sales::Questions::PurchasePrice, type: :model do
     it "has correct min" do
       expect(question.min).to eq(0)
     end
+
+    it "has correct max" do
+      expect(question.max).to be_nil
+    end
   end
 
   context "with year 2026", metadata: { year: 26 } do
@@ -74,5 +78,9 @@ RSpec.describe Form::Sales::Questions::PurchasePrice, type: :model do
     it "has correct min" do
       expect(question.min).to eq(15_000)
     end
+
+    it "has correct max" do
+      expect(question.max).to eq(999_999)
+    end
   end
 end
diff --git a/spec/models/form/sales/questions/value_spec.rb b/spec/models/form/sales/questions/value_spec.rb
index 952b02e7c..057762833 100644
--- a/spec/models/form/sales/questions/value_spec.rb
+++ b/spec/models/form/sales/questions/value_spec.rb
@@ -45,6 +45,10 @@ RSpec.describe Form::Sales::Questions::Value, type: :model do
     it "has correct min" do
       expect(question.min).to eq(0)
     end
+
+    it "has correct max" do
+      expect(question.max).to be_nil
+    end
   end
 
   context "with year 2026", metadata: { year: 26 } do
@@ -54,5 +58,9 @@ RSpec.describe Form::Sales::Questions::Value, type: :model do
     it "has correct min" do
       expect(question.min).to eq(15_000)
     end
+
+    it "has correct max" do
+      expect(question.max).to eq(999_999)
+    end
   end
 end