diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index 23a382c050d9..f2d617d33068 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -463,6 +463,12 @@ def update_status(self, status):
 		self.notify_update()
 		clear_doctype_notifications(self)
 
+	def validate_budget(self):
+		from erpnext.controllers.budget_controller import BudgetValidation
+		val = BudgetValidation(self)
+		val.validate()
+		frappe.throw("stop")
+
 	def on_submit(self):
 		super().on_submit()
 
diff --git a/erpnext/controllers/budget_controller.py b/erpnext/controllers/budget_controller.py
new file mode 100644
index 000000000000..ecc2aad801c5
--- /dev/null
+++ b/erpnext/controllers/budget_controller.py
@@ -0,0 +1,144 @@
+from collections import OrderedDict
+
+import frappe
+from frappe import qb
+
+from erpnext.accounts.utils import get_fiscal_year
+
+
+class BudgetValidation:
+	def __init__(self, doc: object):
+		self.doc = doc
+		self.company = doc.get("company")
+		self.doc_date = (
+			doc.get("transaction_date") if doc.get("doctype") == "Purchase Order" else doc.get("posting_date")
+		)
+		fy = get_fiscal_year(self.doc_date)
+		self.fiscal_year = fy[0]
+		self.fy_start_date = fy[1]
+		self.fy_end_date = fy[2]
+		self.get_dimensions()
+		# When GL Map is passed, there is a possibility of multiple fiscal year.
+		# TODO: need to handle it
+
+	def get_dimensions(self):
+		self.dimensions = []
+		for _x in frappe.db.get_all("Accounting Dimension"):
+			self.dimensions.append(frappe.get_doc("Accounting Dimension", _x.name))
+		self.dimensions.extend(
+			[
+				{"fieldname": "cost_center", "document_type": "Cost Center"},
+				{"fieldname": "project", "document_type": "Project"},
+			]
+		)
+
+	def get_budget_records(self) -> list:
+		bud = qb.DocType("Budget")
+		bud_acc = qb.DocType("Budget Account")
+		query = (
+			qb.from_(bud)
+			.inner_join(bud_acc)
+			.on(bud.name == bud_acc.parent)
+			.select(
+				bud.name,
+				bud.budget_against,
+				bud.company,
+				bud.applicable_on_material_request,
+				bud.action_if_annual_budget_exceeded_on_mr,
+				bud.action_if_accumulated_monthly_budget_exceeded_on_mr,
+				bud.applicable_on_purchase_order,
+				bud.action_if_annual_budget_exceeded_on_po,
+				bud.action_if_accumulated_monthly_budget_exceeded_on_po,
+				bud.applicable_on_booking_actual_expenses,
+				bud.action_if_annual_budget_exceeded,
+				bud.action_if_accumulated_monthly_budget_exceeded,
+				bud_acc.account,
+				bud_acc.budget_amount,
+			)
+			.where(bud.docstatus.eq(1) & bud.fiscal_year.eq(self.fiscal_year) & bud.company.eq(self.company))
+		)
+
+		# add dimension fields
+		for x in self.dimensions:
+			query = query.select(bud[x.get("fieldname")])
+
+		_budgets = query.run(as_dict=True)
+		return _budgets
+
+	def build_budget_keys_and_map(self):
+		"""
+		key structure - (dimension_type, dimension, GL account)
+		"""
+		_budgets = self.get_budget_records()
+		_keys = []
+		self.budget_map = OrderedDict()
+		for _bud in _budgets:
+			budget_against = frappe.scrub(_bud.budget_against)
+			dimension = _bud.get(budget_against)
+			key = (budget_against, dimension, _bud.account)
+			# TODO: ensure duplicate keys are not possible
+			self.budget_map[key] = _bud
+		self.budget_keys = self.budget_map.keys()
+
+	def build_doc_or_item_keys_and_map(self):
+		"""
+		key structure - (dimension_type, dimension, GL account)
+		"""
+		self.doc_or_item_map = OrderedDict()
+		_key = []
+		for itm in self.doc.items:
+			for dim in self.dimensions:
+				if itm.get(dim.get("fieldname")):
+					key = (dim.get("fieldname"), itm.get(dim.get("fieldname")), itm.expense_account)
+					# TODO: How to handle duplicate items - same item with same dimension with same account
+					self.doc_or_item_map.setdefault(key, []).append(itm)
+		self.doc_or_item_keys = self.doc_or_item_map.keys()
+
+	def build_to_validate_map(self):
+		self.overlap = self.budget_keys & self.doc_or_item_keys
+		self.to_validate = OrderedDict()
+
+		for key in self.overlap:
+			self.to_validate[key] = OrderedDict(
+				{
+					"budget_amount": self.budget_map[key].budget_amount,
+					"items_to_process": self.doc_or_item_map[key],
+				}
+			)
+
+	def validate(self):
+		self.build_budget_keys_and_map()
+		self.build_doc_or_item_keys_and_map()
+		self.build_to_validate_map()
+		self.validate_for_overbooking()
+
+	def get_ordered_amount(self):
+		items = set([x.item_code for x in self.doc.items])
+		exp_accounts = set([x.expense_account for x in self.doc.items])
+
+		po = qb.DocType("Purchase Order")
+		poi = qb.DocType("Purchase Order Item")
+
+		query = (
+			qb.from_(po)
+			.inner_join(poi)
+			.on(po.name == poi.parent)
+			.select(po.name)
+			.where(
+				po.docstatus.eq(1)
+				& (poi.amount > poi.billed_amt)
+				& po.status.ne("Closed")
+				& poi.item_code.isin(items)
+				& poi.expense_account.isin(exp_accounts)
+				& po.transaction_date[self.fy_start_date : self.fy_end_date]
+			)
+		)
+		print("Query:", query)
+
+	def validate_for_overbooking(self):
+		# TODO: Need to fetch historical amount and add them to the current document
+		# TODO: handle applicable checkboxes
+		for v in self.to_validate.values():
+			v["current_amount"] = sum([x.amount for x in v.get("items_to_process")])
+
+		self.get_ordered_amount()