diff --git a/admin/app/components/solidus_admin/adjustment_reasons/index/component.rb b/admin/app/components/solidus_admin/adjustment_reasons/index/component.rb
index e6d297e9904..8017a880cf1 100644
--- a/admin/app/components/solidus_admin/adjustment_reasons/index/component.rb
+++ b/admin/app/components/solidus_admin/adjustment_reasons/index/component.rb
@@ -13,6 +13,20 @@ def search_key
     :name_or_code_cont
   end
 
+  def page_actions
+    render component("ui/button").new(
+      tag: :a,
+      text: t('.add'),
+      href: solidus_admin.new_adjustment_reason_path, data: { turbo_frame: :new_adjustment_reason_modal },
+      icon: "add-line",
+      class: "align-self-end w-full",
+    )
+  end
+
+  def turbo_frames
+    %w[new_adjustment_reason_modal]
+  end
+
   def row_url(adjustment_reason)
     spree.edit_admin_adjustment_reason_path(adjustment_reason)
   end
diff --git a/admin/app/components/solidus_admin/adjustment_reasons/new/component.html.erb b/admin/app/components/solidus_admin/adjustment_reasons/new/component.html.erb
new file mode 100644
index 00000000000..1a3e58fda9b
--- /dev/null
+++ b/admin/app/components/solidus_admin/adjustment_reasons/new/component.html.erb
@@ -0,0 +1,27 @@
+<%= turbo_frame_tag :new_adjustment_reason_modal do %>
+  <%= render component("ui/modal").new(title: t(".title")) do |modal| %>
+    <%= form_for @adjustment_reason, url: solidus_admin.adjustment_reasons_path, html: { id: form_id } do |f| %>
+      <div class="flex flex-col gap-6 pb-4">
+        <%= render component("ui/forms/field").text_field(f, :name, class: "required") %>
+        <%= render component("ui/forms/field").text_field(f, :code, class: "required") %>
+        <label class="flex gap-2 items-center">
+          <%= render component("ui/forms/checkbox").new(
+            name: "#{f.object_name}[active]",
+            value: "1",
+            checked: f.object.active
+          ) %>
+          <span class="font-semibold text-xs ml-2"><%= Spree::TaxCategory.human_attribute_name :active %></span>
+          <%= render component("ui/toggletip").new(text: t(".hints.active")) %>
+        </label>
+      </div>
+      <% modal.with_actions do %>
+        <form method="dialog">
+          <%= render component("ui/button").new(scheme: :secondary, text: t('.cancel')) %>
+        </form>
+        <%= render component("ui/button").new(form: form_id, type: :submit, text: t('.submit')) %>
+      <% end %>
+    <% end %>
+  <% end %>
+<% end %>
+
+<%= render component("adjustment_reasons/index").new(page: @page) %>
diff --git a/admin/app/components/solidus_admin/adjustment_reasons/new/component.rb b/admin/app/components/solidus_admin/adjustment_reasons/new/component.rb
new file mode 100644
index 00000000000..dddf9ddb8a0
--- /dev/null
+++ b/admin/app/components/solidus_admin/adjustment_reasons/new/component.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class SolidusAdmin::AdjustmentReasons::New::Component < SolidusAdmin::BaseComponent
+  def initialize(page:, adjustment_reason:)
+    @page = page
+    @adjustment_reason = adjustment_reason
+  end
+
+  def form_id
+    dom_id(@adjustment_reason, "#{stimulus_id}_new_adjustment_reason_form")
+  end
+end
diff --git a/admin/app/components/solidus_admin/adjustment_reasons/new/component.yml b/admin/app/components/solidus_admin/adjustment_reasons/new/component.yml
new file mode 100644
index 00000000000..6b4b6f08c44
--- /dev/null
+++ b/admin/app/components/solidus_admin/adjustment_reasons/new/component.yml
@@ -0,0 +1,8 @@
+# Add your component translations here.
+# Use the translation in the example in your template with `t(".hello")`.
+en:
+  title: "New Adjustment Reason"
+  cancel: "Cancel"
+  submit: "Add Adjustment Reason"
+  hints:
+    active: "When checked, this adjustment reason will be available for selection when adding adjustments to orders."
diff --git a/admin/app/controllers/solidus_admin/adjustment_reasons_controller.rb b/admin/app/controllers/solidus_admin/adjustment_reasons_controller.rb
index 6957634863d..ff548569c12 100644
--- a/admin/app/controllers/solidus_admin/adjustment_reasons_controller.rb
+++ b/admin/app/controllers/solidus_admin/adjustment_reasons_controller.rb
@@ -5,18 +5,50 @@ class AdjustmentReasonsController < SolidusAdmin::BaseController
     include SolidusAdmin::ControllerHelpers::Search
 
     def index
-      adjustment_reasons = apply_search_to(
-        Spree::AdjustmentReason.order(id: :desc),
-        param: :q,
-      )
-
-      set_page_and_extract_portion_from(adjustment_reasons)
+      set_index_page
 
       respond_to do |format|
         format.html { render component('adjustment_reasons/index').new(page: @page) }
       end
     end
 
+    def new
+      @adjustment_reason = Spree::AdjustmentReason.new
+
+      set_index_page
+
+      respond_to do |format|
+        format.html { render component('adjustment_reasons/new').new(page: @page, adjustment_reason: @adjustment_reason) }
+      end
+    end
+
+    def create
+      @adjustment_reason = Spree::AdjustmentReason.new(adjustment_reason_params)
+
+      if @adjustment_reason.save
+        respond_to do |format|
+          flash[:notice] = t('.success')
+
+          format.html do
+            redirect_to solidus_admin.adjustment_reasons_path, status: :see_other
+          end
+
+          format.turbo_stream do
+            render turbo_stream: '<turbo-stream action="refresh" />'
+          end
+        end
+      else
+        set_index_page
+
+        respond_to do |format|
+          format.html do
+            page_component = component('adjustment_reasons/new').new(page: @page, adjustment_reason: @adjustment_reason)
+            render page_component, status: :unprocessable_entity
+          end
+        end
+      end
+    end
+
     def destroy
       @adjustment_reason = Spree::AdjustmentReason.find_by!(id: params[:id])
 
@@ -34,7 +66,16 @@ def load_adjustment_reason
     end
 
     def adjustment_reason_params
-      params.require(:adjustment_reason).permit(:adjustment_reason_id, permitted_adjustment_reason_attributes)
+      params.require(:adjustment_reason).permit(:name, :code, :active)
+    end
+
+    def set_index_page
+      adjustment_reasons = apply_search_to(
+        Spree::AdjustmentReason.order(id: :desc),
+        param: :q,
+      )
+
+      set_page_and_extract_portion_from(adjustment_reasons)
     end
   end
 end
diff --git a/admin/config/locales/adjustment_reasons.en.yml b/admin/config/locales/adjustment_reasons.en.yml
index 90b05a067ce..e812cfa42e3 100644
--- a/admin/config/locales/adjustment_reasons.en.yml
+++ b/admin/config/locales/adjustment_reasons.en.yml
@@ -4,3 +4,5 @@ en:
       title: "Adjustment Reasons"
       destroy:
         success: "Adjustment Reasons were successfully removed."
+      create:
+        success: "Adjustment reason was successfully created."
diff --git a/admin/config/routes.rb b/admin/config/routes.rb
index e4cc29b6711..737fc602c2d 100644
--- a/admin/config/routes.rb
+++ b/admin/config/routes.rb
@@ -63,6 +63,6 @@
   admin_resources :refund_reasons, only: [:index, :new, :create, :destroy]
   admin_resources :reimbursement_types, only: [:index]
   admin_resources :return_reasons, only: [:index, :destroy]
-  admin_resources :adjustment_reasons, only: [:index, :destroy]
+  admin_resources :adjustment_reasons, only: [:index, :new, :create, :destroy]
   admin_resources :store_credit_reasons, only: [:index, :destroy]
 end
diff --git a/admin/spec/features/adjustment_reasons_spec.rb b/admin/spec/features/adjustment_reasons_spec.rb
index 4f0dc85a3fb..9b8452d9693 100644
--- a/admin/spec/features/adjustment_reasons_spec.rb
+++ b/admin/spec/features/adjustment_reasons_spec.rb
@@ -19,4 +19,44 @@
     expect(Spree::AdjustmentReason.count).to eq(0)
     expect(page).to be_axe_clean
   end
+
+  context "when creating a new adjustment reason" do
+    let(:query) { "?page=1&q%5Bname_or_code_cont%5D=new" }
+
+    before do
+      visit "/admin/adjustment_reasons#{query}"
+      click_on "Add new"
+      expect(page).to have_content("New Adjustment Reason")
+      expect(page).to be_axe_clean
+    end
+
+    it "opens a modal" do
+      expect(page).to have_selector("dialog")
+      within("dialog") { click_on "Cancel" }
+      expect(page).not_to have_selector("dialog")
+      expect(page.current_url).to include(query)
+    end
+
+    context "with valid data" do
+      it "successfully creates a new adjustment reason, keeping page and q params" do
+        fill_in "Name", with: "New Reason"
+        fill_in "Code", with: "1234"
+
+        click_on "Add Adjustment Reason"
+
+        expect(page).to have_content("Adjustment reason was successfully created.")
+        expect(Spree::AdjustmentReason.find_by(name: "New Reason")).to be_present
+        expect(page.current_url).to include(query)
+      end
+    end
+
+    context "with invalid data" do
+      it "fails to create a new adjustment reason, keeping page and q params" do
+        click_on "Add Adjustment Reason"
+
+        expect(page).to have_content("can't be blank").twice
+        expect(page.current_url).to include(query)
+      end
+    end
+  end
 end