diff --git a/erpnext/hooks.py b/erpnext/hooks.py
index 1806aaa9c0a..bbfe563ed5e 100644
--- a/erpnext/hooks.py
+++ b/erpnext/hooks.py
@@ -38,6 +38,7 @@ web_include_icons = [
 
 doctype_js = {
 	"Address": "public/js/address.js",
+	"Sales Order": "public/js/sales_order_proforma.js",
 	"Communication": "public/js/communication.js",
 	"Event": "public/js/event.js",
 	"Newsletter": "public/js/newsletter.js",
diff --git a/erpnext/public/js/sales_order_proforma.js b/erpnext/public/js/sales_order_proforma.js
new file mode 100644
index 00000000000..1a9698a82c7
--- /dev/null
+++ b/erpnext/public/js/sales_order_proforma.js
@@ -0,0 +1,248 @@
+// Copyright (c) 2026, Frappe Technologies Pvt. Ltd. and Contributors
+// License: GNU General Public License v3. See license.txt
+
+frappe.ui.form.on("Sales Order", {
+	refresh(frm) {
+		erpnext.proforma.toggle_tab(frm, false);
+		if (frm.doc.docstatus !== 1) return;
+
+		frappe.db.get_single_value("Selling Settings", "enable_proforma_invoice").then((enabled) => {
+			if (!enabled) return;
+
+			frm.add_custom_button(
+				__("Proforma Invoice"),
+				() => erpnext.proforma.open_dialog(frm),
+				__("Create")
+			);
+			erpnext.proforma.render_list(frm);
+		});
+	},
+});
+
+frappe.provide("erpnext.proforma");
+
+Object.assign(erpnext.proforma, {
+	toggle_tab(frm, show) {
+		// Toggle the Tab Break itself: set_df_property refreshes the field control but not the
+		// tab link, so drive the Tab object directly to actually show/hide the tab.
+		const tab = frm.get_field("proforma_html")?.tab;
+		if (tab) {
+			tab.df.hidden = show ? 0 : 1;
+			tab.toggle(show);
+		} else {
+			frm.set_df_property("proforma_tab", "hidden", show ? 0 : 1);
+		}
+	},
+
+	open_dialog(frm) {
+		frappe.call({
+			method: "erpnext.selling.doctype.proforma_invoice.proforma_invoice.get_pending_proforma_qty",
+			args: { sales_order: frm.doc.name },
+			callback: (r) => this.show_dialog(frm, r.message || []),
+		});
+	},
+
+	show_dialog(frm, pending) {
+		frappe.model.with_doctype("Proforma Invoice", () => {
+			const series = frappe.meta.get_docfield("Proforma Invoice", "naming_series");
+			frappe.db
+				.get_single_value("Selling Settings", "default_proforma_print_format")
+				.then((default_print_format) => {
+					this.build_dialog(frm, pending, series ? series.options : "", default_print_format);
+				});
+		});
+	},
+
+	build_dialog(frm, pending, series_options, default_print_format) {
+		const dialog = new frappe.ui.Dialog({
+			title: __("Create Proforma Invoice"),
+			size: "large",
+			fields: [
+				{
+					fieldname: "naming_series",
+					fieldtype: "Select",
+					label: __("Series"),
+					options: series_options,
+					default: (series_options || "").split("\n")[0],
+					reqd: 1,
+				},
+				{ fieldname: "cb_series", fieldtype: "Column Break" },
+				{
+					fieldname: "print_format",
+					fieldtype: "Link",
+					label: __("Print Format"),
+					options: "Print Format",
+					default: default_print_format,
+					get_query: () => ({ filters: { doc_type: "Sales Order" } }),
+				},
+				{
+					fieldname: "letter_head",
+					fieldtype: "Link",
+					label: __("Letter Head"),
+					options: "Letter Head",
+				},
+				{ fieldname: "items_section", fieldtype: "Section Break", label: __("Items") },
+				{
+					fieldname: "items",
+					fieldtype: "Table",
+					cannot_add_rows: true,
+					data: pending.map((row) => ({
+						...row,
+						qty: flt(row.pending_qty),
+						qty_summary: `${format_number(row.pending_qty)} / ${format_number(row.so_qty)}`,
+					})),
+					fields: [
+						{
+							fieldname: "item_code",
+							fieldtype: "Data",
+							label: __("Item"),
+							read_only: 1,
+							in_list_view: 1,
+						},
+						{
+							fieldname: "qty_summary",
+							fieldtype: "Data",
+							label: __("Pending"),
+							read_only: 1,
+							in_list_view: 1,
+						},
+						{
+							fieldname: "qty",
+							fieldtype: "Float",
+							label: __("Qty"),
+							in_list_view: 1,
+						},
+						{ fieldname: "item_name", fieldtype: "Data", hidden: 1 },
+						{ fieldname: "so_detail", fieldtype: "Data", hidden: 1 },
+					],
+				},
+			],
+			primary_action_label: __("Create"),
+			primary_action: (values) => this.create(frm, dialog, values),
+		});
+
+		dialog.show();
+	},
+
+	create(frm, dialog, values) {
+		const items = (values.items || [])
+			.filter((row) => flt(row.qty) > 0)
+			.map((row) => ({ so_detail: row.so_detail, qty: row.qty }));
+
+		if (!items.length) {
+			frappe.msgprint(__("Please enter a quantity for at least one item."));
+			return;
+		}
+
+		frappe.call({
+			method: "erpnext.selling.doctype.proforma_invoice.proforma_invoice.make_proforma_invoice",
+			args: {
+				sales_order: frm.doc.name,
+				items: JSON.stringify(items),
+				naming_series: values.naming_series,
+				print_format: values.print_format,
+				letter_head: values.letter_head,
+			},
+			freeze: true,
+			freeze_message: __("Creating Proforma Invoice..."),
+			callback: (r) => {
+				if (!r.message) return;
+				dialog.hide();
+				frappe.show_alert({
+					message: __("Proforma Invoice {0} created", [r.message]),
+					indicator: "green",
+				});
+				frm.reload_doc();
+			},
+		});
+	},
+
+	render_list(frm) {
+		// EmbeddedList is a lazy bundle (not on the eager desk bundle), so pull it in first.
+		frappe.require("embedded_list.bundle.js", () => this.build_list(frm));
+	},
+
+	build_list(frm) {
+		const wrapper = frm.get_field("proforma_html").$wrapper.empty();
+		const list = new frappe.ui.EmbeddedList({
+			wrapper,
+			doctype: "Proforma Invoice",
+			filters: { sales_order: frm.doc.name, docstatus: 1 },
+			fields: ["name", "proforma_date", "grand_total", "status", "proforma_pdf", "sent_on", "currency"],
+			order_by: "creation desc",
+			empty_message: __("No proforma invoices yet."),
+			// Show the Proforma tab only once at least one proforma exists for this order.
+			after_render() {
+				erpnext.proforma.toggle_tab(frm, (this._all_data || []).length > 0);
+			},
+			columns: [
+				{
+					label: __("Proforma No"),
+					type: "link",
+					fieldname: "name",
+					route: (row) => ["Form", "Proforma Invoice", row.name],
+				},
+				{
+					label: __("Date"),
+					fieldname: "proforma_date",
+					render: (row) => frappe.datetime.str_to_user(row.proforma_date),
+				},
+				{
+					label: __("Grand Total"),
+					fieldname: "grand_total",
+					render: (row) => format_currency(row.grand_total, row.currency),
+				},
+				{
+					label: __("Status"),
+					type: "badge",
+					fieldname: "status",
+					color: (row) => (row.status === "Issued" ? "green" : "gray"),
+				},
+				{
+					type: "actions",
+					actions: [
+						{
+							icon: "printer",
+							label: __("View PDF"),
+							action: (row) => row.proforma_pdf && window.open(row.proforma_pdf, "_blank"),
+						},
+						{
+							icon: "mail",
+							label: __("Send Email"),
+							action: (row, refresh) => this.send_email(frm, row.name, refresh),
+						},
+					],
+				},
+			],
+		});
+		list.refresh();
+	},
+
+	send_email(frm, proforma_name, refresh) {
+		frappe.prompt(
+			[
+				{
+					fieldname: "recipients",
+					fieldtype: "Data",
+					label: __("Recipients"),
+					reqd: 1,
+					default: frm.doc.contact_email,
+					description: __("Comma separated email addresses"),
+				},
+			],
+			(values) => {
+				frappe.call({
+					method: "erpnext.selling.doctype.proforma_invoice.proforma_invoice.send_proforma_email",
+					args: { proforma_name, recipients: values.recipients },
+					freeze: true,
+					callback: () => {
+						frappe.show_alert({ message: __("Proforma emailed"), indicator: "green" });
+						(refresh || (() => this.render_list(frm)))();
+					},
+				});
+			},
+			__("Send Proforma Invoice"),
+			__("Send")
+		);
+	},
+});
diff --git a/erpnext/selling/doctype/sales_order/sales_order.json b/erpnext/selling/doctype/sales_order/sales_order.json
index 0b00a2d8613..9c8ed1bf649 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.json
+++ b/erpnext/selling/doctype/sales_order/sales_order.json
@@ -178,6 +178,8 @@
   "column_break_yvzv",
   "inter_company_order_reference",
   "party_account_currency",
+  "proforma_tab",
+  "proforma_html",
   "connections_tab"
  ],
  "fields": [
@@ -1526,6 +1528,17 @@
    "fieldname": "column_break_49",
    "fieldtype": "Column Break"
   },
+  {
+   "fieldname": "proforma_tab",
+   "fieldtype": "Tab Break",
+   "hidden": 1,
+   "label": "Proforma"
+  },
+  {
+   "fieldname": "proforma_html",
+   "fieldtype": "HTML",
+   "label": "Proforma Invoices"
+  },
   {
    "fieldname": "connections_tab",
    "fieldtype": "Tab Break",
diff --git a/erpnext/selling/doctype/sales_order/sales_order_dashboard.py b/erpnext/selling/doctype/sales_order/sales_order_dashboard.py
index ea9c8d2f96e..f6767c533d0 100644
--- a/erpnext/selling/doctype/sales_order/sales_order_dashboard.py
+++ b/erpnext/selling/doctype/sales_order/sales_order_dashboard.py
@@ -24,6 +24,7 @@ def get_data():
 				"label": _("Fulfillment"),
 				"items": ["Sales Invoice", "Pick List", "Delivery Note", "Maintenance Visit"],
 			},
+			{"label": _("Proforma"), "items": ["Proforma Invoice"]},
 			{"label": _("Purchasing"), "items": ["Material Request", "Purchase Order"]},
 			{"label": _("Projects"), "items": ["Project"]},
 			{"label": _("Manufacturing"), "items": ["Work Order", "BOM", "Blanket Order"]},