diff --git a/erpnext/assets/doctype/asset/asset.py b/erpnext/assets/doctype/asset/asset.py
index e24c41d..4f1caca 100644
--- a/erpnext/assets/doctype/asset/asset.py
+++ b/erpnext/assets/doctype/asset/asset.py
@@ -36,7 +36,6 @@
 	get_depr_schedule,
 	make_draft_asset_depr_schedules,
 	make_draft_asset_depr_schedules_if_not_present,
-	set_draft_asset_depr_schedule_details,
 	update_draft_asset_depr_schedules,
 )
 from erpnext.controllers.accounts_controller import AccountsController
@@ -439,6 +438,17 @@
 			if finance_book == row.finance_book:
 				return row.value_after_depreciation
 
+	def _get_value_after_depreciation_for_making_schedule(self, fb_row):
+		# value_after_depreciation - current Asset value
+		if self.docstatus == 1 and fb_row.value_after_depreciation:
+			value_after_depreciation = flt(fb_row.value_after_depreciation)
+		else:
+			value_after_depreciation = flt(self.gross_purchase_amount) - flt(
+				self.opening_accumulated_depreciation
+			)
+
+		return value_after_depreciation
+
 	def get_default_finance_book_idx(self):
 		if not self.get("default_finance_book") and self.company:
 			self.default_finance_book = erpnext.get_default_finance_book(self.company)
@@ -466,6 +476,25 @@
 
 		return records
 
+	@erpnext.allow_regional
+	def get_depreciation_amount(self, depreciable_value, fb_row):
+		if fb_row.depreciation_method in ("Straight Line", "Manual"):
+			# if the Depreciation Schedule is being prepared for the first time
+			if not self.flags.increase_in_asset_life:
+				depreciation_amount = (
+					flt(self.gross_purchase_amount) - flt(fb_row.expected_value_after_useful_life)
+				) / flt(fb_row.total_number_of_depreciations)
+
+			# if the Depreciation Schedule is being modified after Asset Repair
+			else:
+				depreciation_amount = (
+					flt(fb_row.value_after_depreciation) - flt(fb_row.expected_value_after_useful_life)
+				) / (date_diff(self.to_date, self.available_for_use_date) / 365)
+		else:
+			depreciation_amount = flt(depreciable_value * (flt(fb_row.rate_of_depreciation) / 100))
+
+		return depreciation_amount
+
 	def validate_make_gl_entry(self):
 		purchase_document = self.get_purchase_document()
 		if not purchase_document:
@@ -915,7 +944,7 @@
 		)
 		new_asset_depr_schedule_doc = frappe.copy_doc(current_asset_depr_schedule_doc)
 
-		set_draft_asset_depr_schedule_details(new_asset_depr_schedule_doc, asset, row)
+		new_asset_depr_schedule_doc.set_draft_asset_depr_schedule_details(asset, row)
 
 		accumulated_depreciation = 0
 
@@ -967,7 +996,7 @@
 		)
 		new_asset_depr_schedule_doc = frappe.copy_doc(current_asset_depr_schedule_doc)
 
-		set_draft_asset_depr_schedule_details(new_asset_depr_schedule_doc, new_asset, row)
+		new_asset_depr_schedule_doc.set_draft_asset_depr_schedule_details(new_asset, row)
 
 		accumulated_depreciation = 0
 
diff --git a/erpnext/assets/doctype/asset/test_asset.py b/erpnext/assets/doctype/asset/test_asset.py
index a9af670..9a15263 100644
--- a/erpnext/assets/doctype/asset/test_asset.py
+++ b/erpnext/assets/doctype/asset/test_asset.py
@@ -29,7 +29,6 @@
 	scrap_asset,
 )
 from erpnext.assets.doctype.asset_depreciation_schedule.asset_depreciation_schedule import (
-	clear_depr_schedule,
 	get_asset_depr_schedule_doc,
 	get_depr_schedule,
 )
@@ -925,11 +924,6 @@
 
 	def test_get_depreciation_amount(self):
 		"""Tests if get_depreciation_amount() returns the right value."""
-
-		from erpnext.assets.doctype.asset_depreciation_schedule.asset_depreciation_schedule import (
-			get_depreciation_amount,
-		)
-
 		asset = create_asset(item_code="Macbook Pro", available_for_use_date="2019-12-31")
 
 		asset.calculate_depreciation = 1
@@ -944,7 +938,7 @@
 			},
 		)
 
-		depreciation_amount = get_depreciation_amount(asset, 100000, asset.finance_books[0])
+		depreciation_amount = asset.get_depreciation_amount(100000, asset.finance_books[0])
 		self.assertEqual(depreciation_amount, 30000)
 
 	def test_make_depr_schedule(self):
@@ -1260,7 +1254,7 @@
 
 		asset_depr_schedule_doc = get_asset_depr_schedule_doc(asset.name, "Active")
 
-		clear_depr_schedule(asset_depr_schedule_doc)
+		asset_depr_schedule_doc.clear_depr_schedule()
 
 		self.assertEqual(len(asset_depr_schedule_doc.get("depreciation_schedule")), 1)
 
@@ -1309,19 +1303,19 @@
 		asset_depr_schedule_doc_1 = get_asset_depr_schedule_doc(
 			asset.name, "Active", "Test Finance Book 1"
 		)
-		clear_depr_schedule(asset_depr_schedule_doc_1)
+		asset_depr_schedule_doc_1.clear_depr_schedule()
 		self.assertEqual(len(asset_depr_schedule_doc_1.get("depreciation_schedule")), 3)
 
 		asset_depr_schedule_doc_2 = get_asset_depr_schedule_doc(
 			asset.name, "Active", "Test Finance Book 2"
 		)
-		clear_depr_schedule(asset_depr_schedule_doc_2)
+		asset_depr_schedule_doc_2.clear_depr_schedule()
 		self.assertEqual(len(asset_depr_schedule_doc_2.get("depreciation_schedule")), 3)
 
 		asset_depr_schedule_doc_3 = get_asset_depr_schedule_doc(
 			asset.name, "Active", "Test Finance Book 3"
 		)
-		clear_depr_schedule(asset_depr_schedule_doc_3)
+		asset_depr_schedule_doc_3.clear_depr_schedule()
 		self.assertEqual(len(asset_depr_schedule_doc_3.get("depreciation_schedule")), 0)
 
 	def test_depreciation_schedules_are_set_up_for_multiple_finance_books(self):
diff --git a/erpnext/assets/doctype/asset_depreciation_schedule/asset_depreciation_schedule.py b/erpnext/assets/doctype/asset_depreciation_schedule/asset_depreciation_schedule.py
index 02e508a..7615fbc 100644
--- a/erpnext/assets/doctype/asset_depreciation_schedule/asset_depreciation_schedule.py
+++ b/erpnext/assets/doctype/asset_depreciation_schedule/asset_depreciation_schedule.py
@@ -4,17 +4,7 @@
 import frappe
 from frappe import _
 from frappe.model.document import Document
-from frappe.utils import (
-	add_days,
-	add_months,
-	cint,
-	date_diff,
-	flt,
-	get_last_day,
-	is_last_day_of_the_month,
-)
-
-import erpnext
+from frappe.utils import add_days, add_months, cint, flt, get_last_day, is_last_day_of_the_month
 
 
 class AssetDepreciationSchedule(Document):
@@ -83,7 +73,256 @@
 		)
 		asset_finance_book_doc = frappe.get_doc("Asset Finance Book", asset_finance_book_name)
 
-		prepare_draft_asset_depr_schedule_data(self, asset_doc, asset_finance_book_doc)
+		self.prepare_draft_asset_depr_schedule_data(asset_doc, asset_finance_book_doc)
+
+	def prepare_draft_asset_depr_schedule_data(
+		self,
+		asset_doc,
+		row,
+		date_of_disposal=None,
+		date_of_return=None,
+		update_asset_finance_book_row=True,
+	):
+		self.set_draft_asset_depr_schedule_details(asset_doc, row)
+		self.make_depr_schedule(asset_doc, row, date_of_disposal, update_asset_finance_book_row)
+		self.set_accumulated_depreciation(row, date_of_disposal, date_of_return)
+
+	def set_draft_asset_depr_schedule_details(self, asset_doc, row):
+		self.asset = asset_doc.name
+		self.finance_book = row.finance_book
+		self.finance_book_id = row.idx
+		self.opening_accumulated_depreciation = asset_doc.opening_accumulated_depreciation
+		self.depreciation_method = row.depreciation_method
+		self.total_number_of_depreciations = row.total_number_of_depreciations
+		self.frequency_of_depreciation = row.frequency_of_depreciation
+		self.rate_of_depreciation = row.rate_of_depreciation
+		self.expected_value_after_useful_life = row.expected_value_after_useful_life
+		self.status = "Draft"
+
+	def make_depr_schedule(
+		self, asset_doc, row, date_of_disposal, update_asset_finance_book_row=True
+	):
+		if row.depreciation_method != "Manual" and not self.get("depreciation_schedule"):
+			self.depreciation_schedule = []
+
+		if not asset_doc.available_for_use_date:
+			return
+
+		start = self.clear_depr_schedule()
+
+		self._make_depr_schedule(asset_doc, row, start, date_of_disposal, update_asset_finance_book_row)
+
+	def clear_depr_schedule(self):
+		start = 0
+		num_of_depreciations_completed = 0
+		depr_schedule = []
+
+		for schedule in self.get("depreciation_schedule"):
+			if schedule.journal_entry:
+				num_of_depreciations_completed += 1
+				depr_schedule.append(schedule)
+			else:
+				start = num_of_depreciations_completed
+				break
+
+		self.depreciation_schedule = depr_schedule
+
+		return start
+
+	def _make_depr_schedule(
+		self, asset_doc, row, start, date_of_disposal, update_asset_finance_book_row
+	):
+		asset_doc.validate_asset_finance_books(row)
+
+		value_after_depreciation = asset_doc._get_value_after_depreciation_for_making_schedule(row)
+		row.value_after_depreciation = value_after_depreciation
+
+		if update_asset_finance_book_row:
+			row.db_update()
+
+		number_of_pending_depreciations = cint(row.total_number_of_depreciations) - cint(
+			asset_doc.number_of_depreciations_booked
+		)
+
+		has_pro_rata = asset_doc.check_is_pro_rata(row)
+		if has_pro_rata:
+			number_of_pending_depreciations += 1
+
+		skip_row = False
+		should_get_last_day = is_last_day_of_the_month(row.depreciation_start_date)
+
+		for n in range(start, number_of_pending_depreciations):
+			# If depreciation is already completed (for double declining balance)
+			if skip_row:
+				continue
+
+			depreciation_amount = asset_doc.get_depreciation_amount(value_after_depreciation, row)
+
+			if not has_pro_rata or n < cint(number_of_pending_depreciations) - 1:
+				schedule_date = add_months(
+					row.depreciation_start_date, n * cint(row.frequency_of_depreciation)
+				)
+
+				if should_get_last_day:
+					schedule_date = get_last_day(schedule_date)
+
+				# schedule date will be a year later from start date
+				# so monthly schedule date is calculated by removing 11 months from it
+				monthly_schedule_date = add_months(schedule_date, -row.frequency_of_depreciation + 1)
+
+			# if asset is being sold or scrapped
+			if date_of_disposal:
+				from_date = asset_doc.available_for_use_date
+				if self.depreciation_schedule:
+					from_date = self.depreciation_schedule[-1].schedule_date
+
+				depreciation_amount, days, months = asset_doc.get_pro_rata_amt(
+					row, depreciation_amount, from_date, date_of_disposal
+				)
+
+				if depreciation_amount > 0:
+					self.add_depr_schedule_row(
+						date_of_disposal,
+						depreciation_amount,
+						row.depreciation_method,
+					)
+
+				break
+
+			# For first row
+			if has_pro_rata and not asset_doc.opening_accumulated_depreciation and n == 0:
+				from_date = add_days(
+					asset_doc.available_for_use_date, -1
+				)  # needed to calc depr amount for available_for_use_date too
+				depreciation_amount, days, months = asset_doc.get_pro_rata_amt(
+					row, depreciation_amount, from_date, row.depreciation_start_date
+				)
+
+				# For first depr schedule date will be the start date
+				# so monthly schedule date is calculated by removing
+				# month difference between use date and start date
+				monthly_schedule_date = add_months(row.depreciation_start_date, -months + 1)
+
+			# For last row
+			elif has_pro_rata and n == cint(number_of_pending_depreciations) - 1:
+				if not asset_doc.flags.increase_in_asset_life:
+					# In case of increase_in_asset_life, the asset.to_date is already set on asset_repair submission
+					asset_doc.to_date = add_months(
+						asset_doc.available_for_use_date,
+						(n + asset_doc.number_of_depreciations_booked) * cint(row.frequency_of_depreciation),
+					)
+
+				depreciation_amount_without_pro_rata = depreciation_amount
+
+				depreciation_amount, days, months = asset_doc.get_pro_rata_amt(
+					row, depreciation_amount, schedule_date, asset_doc.to_date
+				)
+
+				depreciation_amount = self.get_adjusted_depreciation_amount(
+					depreciation_amount_without_pro_rata, depreciation_amount
+				)
+
+				monthly_schedule_date = add_months(schedule_date, 1)
+				schedule_date = add_days(schedule_date, days)
+				last_schedule_date = schedule_date
+
+			if not depreciation_amount:
+				continue
+			value_after_depreciation -= flt(
+				depreciation_amount, asset_doc.precision("gross_purchase_amount")
+			)
+
+			# Adjust depreciation amount in the last period based on the expected value after useful life
+			if row.expected_value_after_useful_life and (
+				(
+					n == cint(number_of_pending_depreciations) - 1
+					and value_after_depreciation != row.expected_value_after_useful_life
+				)
+				or value_after_depreciation < row.expected_value_after_useful_life
+			):
+				depreciation_amount += value_after_depreciation - row.expected_value_after_useful_life
+				skip_row = True
+
+			if depreciation_amount > 0:
+				self.add_depr_schedule_row(
+					schedule_date,
+					depreciation_amount,
+					row.depreciation_method,
+				)
+
+	# to ensure that final accumulated depreciation amount is accurate
+	def get_adjusted_depreciation_amount(
+		self, depreciation_amount_without_pro_rata, depreciation_amount_for_last_row
+	):
+		if not self.opening_accumulated_depreciation:
+			depreciation_amount_for_first_row = self.get_depreciation_amount_for_first_row()
+
+			if (
+				depreciation_amount_for_first_row + depreciation_amount_for_last_row
+				!= depreciation_amount_without_pro_rata
+			):
+				depreciation_amount_for_last_row = (
+					depreciation_amount_without_pro_rata - depreciation_amount_for_first_row
+				)
+
+		return depreciation_amount_for_last_row
+
+	def get_depreciation_amount_for_first_row(self):
+		return self.get("depreciation_schedule")[0].depreciation_amount
+
+	def add_depr_schedule_row(
+		self,
+		schedule_date,
+		depreciation_amount,
+		depreciation_method,
+	):
+		self.append(
+			"depreciation_schedule",
+			{
+				"schedule_date": schedule_date,
+				"depreciation_amount": depreciation_amount,
+				"depreciation_method": depreciation_method,
+			},
+		)
+
+	def set_accumulated_depreciation(
+		self,
+		row,
+		date_of_disposal=None,
+		date_of_return=None,
+		ignore_booked_entry=False,
+	):
+		straight_line_idx = [
+			d.idx for d in self.get("depreciation_schedule") if d.depreciation_method == "Straight Line"
+		]
+
+		accumulated_depreciation = flt(self.opening_accumulated_depreciation)
+		value_after_depreciation = flt(row.value_after_depreciation)
+
+		for i, d in enumerate(self.get("depreciation_schedule")):
+			if ignore_booked_entry and d.journal_entry:
+				continue
+
+			depreciation_amount = flt(d.depreciation_amount, d.precision("depreciation_amount"))
+			value_after_depreciation -= flt(depreciation_amount)
+
+			# for the last row, if depreciation method = Straight Line
+			if (
+				straight_line_idx
+				and i == max(straight_line_idx) - 1
+				and not date_of_disposal
+				and not date_of_return
+			):
+				depreciation_amount += flt(
+					value_after_depreciation - flt(row.expected_value_after_useful_life),
+					d.precision("depreciation_amount"),
+				)
+
+			d.depreciation_amount = depreciation_amount
+			accumulated_depreciation += d.depreciation_amount
+			d.accumulated_depreciation_amount = flt(
+				accumulated_depreciation, d.precision("accumulated_depreciation_amount")
+			)
 
 
 def make_draft_asset_depr_schedules_if_not_present(asset_doc):
@@ -108,7 +347,7 @@
 def make_draft_asset_depr_schedule(asset_doc, row):
 	asset_depr_schedule_doc = frappe.new_doc("Asset Depreciation Schedule")
 
-	prepare_draft_asset_depr_schedule_data(asset_depr_schedule_doc, asset_doc, row)
+	asset_depr_schedule_doc.prepare_draft_asset_depr_schedule_data(asset_doc, row)
 
 	asset_depr_schedule_doc.insert()
 
@@ -120,41 +359,11 @@
 		if not asset_depr_schedule_doc:
 			continue
 
-		prepare_draft_asset_depr_schedule_data(asset_depr_schedule_doc, asset_doc, row)
+		asset_depr_schedule_doc.prepare_draft_asset_depr_schedule_data(asset_doc, row)
 
 		asset_depr_schedule_doc.save()
 
 
-def prepare_draft_asset_depr_schedule_data(
-	asset_depr_schedule_doc,
-	asset_doc,
-	row,
-	date_of_disposal=None,
-	date_of_return=None,
-	update_asset_finance_book_row=True,
-):
-	set_draft_asset_depr_schedule_details(asset_depr_schedule_doc, asset_doc, row)
-	make_depr_schedule(
-		asset_depr_schedule_doc, asset_doc, row, date_of_disposal, update_asset_finance_book_row
-	)
-	set_accumulated_depreciation(asset_depr_schedule_doc, row, date_of_disposal, date_of_return)
-
-
-def set_draft_asset_depr_schedule_details(asset_depr_schedule_doc, asset_doc, row):
-	asset_depr_schedule_doc.asset = asset_doc.name
-	asset_depr_schedule_doc.finance_book = row.finance_book
-	asset_depr_schedule_doc.finance_book_id = row.idx
-	asset_depr_schedule_doc.opening_accumulated_depreciation = (
-		asset_doc.opening_accumulated_depreciation
-	)
-	asset_depr_schedule_doc.depreciation_method = row.depreciation_method
-	asset_depr_schedule_doc.total_number_of_depreciations = row.total_number_of_depreciations
-	asset_depr_schedule_doc.frequency_of_depreciation = row.frequency_of_depreciation
-	asset_depr_schedule_doc.rate_of_depreciation = row.rate_of_depreciation
-	asset_depr_schedule_doc.expected_value_after_useful_life = row.expected_value_after_useful_life
-	asset_depr_schedule_doc.status = "Draft"
-
-
 def convert_draft_asset_depr_schedules_into_active(asset_doc):
 	for row in asset_doc.get("finance_books"):
 		asset_depr_schedule_doc = get_asset_depr_schedule_doc(asset_doc.name, "Draft", row.finance_book)
@@ -192,8 +401,8 @@
 
 		new_asset_depr_schedule_doc = frappe.copy_doc(current_asset_depr_schedule_doc)
 
-		make_depr_schedule(new_asset_depr_schedule_doc, asset_doc, row, date_of_disposal)
-		set_accumulated_depreciation(new_asset_depr_schedule_doc, row, date_of_disposal, date_of_return)
+		new_asset_depr_schedule_doc.make_depr_schedule(asset_doc, row, date_of_disposal)
+		new_asset_depr_schedule_doc.set_accumulated_depreciation(row, date_of_disposal, date_of_return)
 
 		new_asset_depr_schedule_doc.notes = notes
 
@@ -208,8 +417,7 @@
 ):
 	asset_depr_schedule_doc = frappe.new_doc("Asset Depreciation Schedule")
 
-	prepare_draft_asset_depr_schedule_data(
-		asset_depr_schedule_doc,
+	asset_depr_schedule_doc.prepare_draft_asset_depr_schedule_data(
 		asset_doc,
 		row,
 		date_of_disposal,
@@ -254,275 +462,3 @@
 			["status", "=", status],
 		],
 	)
-
-
-def make_depr_schedule(
-	asset_depr_schedule_doc, asset_doc, row, date_of_disposal, update_asset_finance_book_row=True
-):
-	if row.depreciation_method != "Manual" and not asset_depr_schedule_doc.get(
-		"depreciation_schedule"
-	):
-		asset_depr_schedule_doc.depreciation_schedule = []
-
-	if not asset_doc.available_for_use_date:
-		return
-
-	start = clear_depr_schedule(asset_depr_schedule_doc)
-
-	_make_depr_schedule(
-		asset_depr_schedule_doc, asset_doc, row, start, date_of_disposal, update_asset_finance_book_row
-	)
-
-
-def clear_depr_schedule(asset_depr_schedule_doc):
-	start = 0
-	num_of_depreciations_completed = 0
-	depr_schedule = []
-
-	for schedule in asset_depr_schedule_doc.get("depreciation_schedule"):
-		if schedule.journal_entry:
-			num_of_depreciations_completed += 1
-			depr_schedule.append(schedule)
-		else:
-			start = num_of_depreciations_completed
-			break
-
-	asset_depr_schedule_doc.depreciation_schedule = depr_schedule
-
-	return start
-
-
-def _make_depr_schedule(
-	asset_depr_schedule_doc, asset_doc, row, start, date_of_disposal, update_asset_finance_book_row
-):
-	asset_doc.validate_asset_finance_books(row)
-
-	value_after_depreciation = _get_value_after_depreciation_for_making_schedule(asset_doc, row)
-	row.value_after_depreciation = value_after_depreciation
-
-	if update_asset_finance_book_row:
-		row.db_update()
-
-	number_of_pending_depreciations = cint(row.total_number_of_depreciations) - cint(
-		asset_doc.number_of_depreciations_booked
-	)
-
-	has_pro_rata = asset_doc.check_is_pro_rata(row)
-	if has_pro_rata:
-		number_of_pending_depreciations += 1
-
-	skip_row = False
-	should_get_last_day = is_last_day_of_the_month(row.depreciation_start_date)
-
-	for n in range(start, number_of_pending_depreciations):
-		# If depreciation is already completed (for double declining balance)
-		if skip_row:
-			continue
-
-		depreciation_amount = get_depreciation_amount(asset_doc, value_after_depreciation, row)
-
-		if not has_pro_rata or n < cint(number_of_pending_depreciations) - 1:
-			schedule_date = add_months(row.depreciation_start_date, n * cint(row.frequency_of_depreciation))
-
-			if should_get_last_day:
-				schedule_date = get_last_day(schedule_date)
-
-			# schedule date will be a year later from start date
-			# so monthly schedule date is calculated by removing 11 months from it
-			monthly_schedule_date = add_months(schedule_date, -row.frequency_of_depreciation + 1)
-
-		# if asset is being sold or scrapped
-		if date_of_disposal:
-			from_date = asset_doc.available_for_use_date
-			if asset_depr_schedule_doc.depreciation_schedule:
-				from_date = asset_depr_schedule_doc.depreciation_schedule[-1].schedule_date
-
-			depreciation_amount, days, months = asset_doc.get_pro_rata_amt(
-				row, depreciation_amount, from_date, date_of_disposal
-			)
-
-			if depreciation_amount > 0:
-				add_depr_schedule_row(
-					asset_depr_schedule_doc,
-					date_of_disposal,
-					depreciation_amount,
-					row.depreciation_method,
-				)
-
-			break
-
-		# For first row
-		if has_pro_rata and not asset_doc.opening_accumulated_depreciation and n == 0:
-			from_date = add_days(
-				asset_doc.available_for_use_date, -1
-			)  # needed to calc depr amount for available_for_use_date too
-			depreciation_amount, days, months = asset_doc.get_pro_rata_amt(
-				row, depreciation_amount, from_date, row.depreciation_start_date
-			)
-
-			# For first depr schedule date will be the start date
-			# so monthly schedule date is calculated by removing
-			# month difference between use date and start date
-			monthly_schedule_date = add_months(row.depreciation_start_date, -months + 1)
-
-		# For last row
-		elif has_pro_rata and n == cint(number_of_pending_depreciations) - 1:
-			if not asset_doc.flags.increase_in_asset_life:
-				# In case of increase_in_asset_life, the asset.to_date is already set on asset_repair submission
-				asset_doc.to_date = add_months(
-					asset_doc.available_for_use_date,
-					(n + asset_doc.number_of_depreciations_booked) * cint(row.frequency_of_depreciation),
-				)
-
-			depreciation_amount_without_pro_rata = depreciation_amount
-
-			depreciation_amount, days, months = asset_doc.get_pro_rata_amt(
-				row, depreciation_amount, schedule_date, asset_doc.to_date
-			)
-
-			depreciation_amount = get_adjusted_depreciation_amount(
-				asset_depr_schedule_doc, depreciation_amount_without_pro_rata, depreciation_amount
-			)
-
-			monthly_schedule_date = add_months(schedule_date, 1)
-			schedule_date = add_days(schedule_date, days)
-			last_schedule_date = schedule_date
-
-		if not depreciation_amount:
-			continue
-		value_after_depreciation -= flt(
-			depreciation_amount, asset_doc.precision("gross_purchase_amount")
-		)
-
-		# Adjust depreciation amount in the last period based on the expected value after useful life
-		if row.expected_value_after_useful_life and (
-			(
-				n == cint(number_of_pending_depreciations) - 1
-				and value_after_depreciation != row.expected_value_after_useful_life
-			)
-			or value_after_depreciation < row.expected_value_after_useful_life
-		):
-			depreciation_amount += value_after_depreciation - row.expected_value_after_useful_life
-			skip_row = True
-
-		if depreciation_amount > 0:
-			add_depr_schedule_row(
-				asset_depr_schedule_doc,
-				schedule_date,
-				depreciation_amount,
-				row.depreciation_method,
-			)
-
-
-def _get_value_after_depreciation_for_making_schedule(asset_doc, row):
-	# value_after_depreciation - current Asset value
-	if asset_doc.docstatus == 1 and row.value_after_depreciation:
-		value_after_depreciation = flt(row.value_after_depreciation)
-	else:
-		value_after_depreciation = flt(asset_doc.gross_purchase_amount) - flt(
-			asset_doc.opening_accumulated_depreciation
-		)
-
-	return value_after_depreciation
-
-
-# to ensure that final accumulated depreciation amount is accurate
-def get_adjusted_depreciation_amount(
-	asset_depr_schedule_doc, depreciation_amount_without_pro_rata, depreciation_amount_for_last_row
-):
-	if not asset_depr_schedule_doc.opening_accumulated_depreciation:
-		depreciation_amount_for_first_row = get_depreciation_amount_for_first_row(
-			asset_depr_schedule_doc
-		)
-
-		if (
-			depreciation_amount_for_first_row + depreciation_amount_for_last_row
-			!= depreciation_amount_without_pro_rata
-		):
-			depreciation_amount_for_last_row = (
-				depreciation_amount_without_pro_rata - depreciation_amount_for_first_row
-			)
-
-	return depreciation_amount_for_last_row
-
-
-def get_depreciation_amount_for_first_row(asset_depr_schedule_doc):
-	return asset_depr_schedule_doc.get("depreciation_schedule")[0].depreciation_amount
-
-
-@erpnext.allow_regional
-def get_depreciation_amount(asset_doc, depreciable_value, row):
-	if row.depreciation_method in ("Straight Line", "Manual"):
-		# if the Depreciation Schedule is being prepared for the first time
-		if not asset_doc.flags.increase_in_asset_life:
-			depreciation_amount = (
-				flt(asset_doc.gross_purchase_amount) - flt(row.expected_value_after_useful_life)
-			) / flt(row.total_number_of_depreciations)
-
-		# if the Depreciation Schedule is being modified after Asset Repair
-		else:
-			depreciation_amount = (
-				flt(row.value_after_depreciation) - flt(row.expected_value_after_useful_life)
-			) / (date_diff(asset_doc.to_date, asset_doc.available_for_use_date) / 365)
-	else:
-		depreciation_amount = flt(depreciable_value * (flt(row.rate_of_depreciation) / 100))
-
-	return depreciation_amount
-
-
-def add_depr_schedule_row(
-	asset_depr_schedule_doc,
-	schedule_date,
-	depreciation_amount,
-	depreciation_method,
-):
-	asset_depr_schedule_doc.append(
-		"depreciation_schedule",
-		{
-			"schedule_date": schedule_date,
-			"depreciation_amount": depreciation_amount,
-			"depreciation_method": depreciation_method,
-		},
-	)
-
-
-def set_accumulated_depreciation(
-	asset_depr_schedule_doc,
-	row,
-	date_of_disposal=None,
-	date_of_return=None,
-	ignore_booked_entry=False,
-):
-	straight_line_idx = [
-		d.idx
-		for d in asset_depr_schedule_doc.get("depreciation_schedule")
-		if d.depreciation_method == "Straight Line"
-	]
-
-	accumulated_depreciation = flt(asset_depr_schedule_doc.opening_accumulated_depreciation)
-	value_after_depreciation = flt(row.value_after_depreciation)
-
-	for i, d in enumerate(asset_depr_schedule_doc.get("depreciation_schedule")):
-		if ignore_booked_entry and d.journal_entry:
-			continue
-
-		depreciation_amount = flt(d.depreciation_amount, d.precision("depreciation_amount"))
-		value_after_depreciation -= flt(depreciation_amount)
-
-		# for the last row, if depreciation method = Straight Line
-		if (
-			straight_line_idx
-			and i == max(straight_line_idx) - 1
-			and not date_of_disposal
-			and not date_of_return
-		):
-			depreciation_amount += flt(
-				value_after_depreciation - flt(row.expected_value_after_useful_life),
-				d.precision("depreciation_amount"),
-			)
-
-		d.depreciation_amount = depreciation_amount
-		accumulated_depreciation += d.depreciation_amount
-		d.accumulated_depreciation_amount = flt(
-			accumulated_depreciation, d.precision("accumulated_depreciation_amount")
-		)
diff --git a/erpnext/assets/doctype/asset_value_adjustment/asset_value_adjustment.py b/erpnext/assets/doctype/asset_value_adjustment/asset_value_adjustment.py
index 539cdec..31d6ffa 100644
--- a/erpnext/assets/doctype/asset_value_adjustment/asset_value_adjustment.py
+++ b/erpnext/assets/doctype/asset_value_adjustment/asset_value_adjustment.py
@@ -14,8 +14,6 @@
 from erpnext.assets.doctype.asset.depreciation import get_depreciation_accounts
 from erpnext.assets.doctype.asset_depreciation_schedule.asset_depreciation_schedule import (
 	get_asset_depr_schedule_doc,
-	get_depreciation_amount,
-	set_accumulated_depreciation,
 )
 
 
@@ -164,7 +162,7 @@
 						depreciation_amount = days * rate_per_day
 						from_date = data.schedule_date
 					else:
-						depreciation_amount = get_depreciation_amount(asset, value_after_depreciation, d)
+						depreciation_amount = asset.get_depreciation_amount(value_after_depreciation, d)
 
 					if depreciation_amount:
 						value_after_depreciation -= flt(depreciation_amount)
@@ -172,7 +170,7 @@
 
 			d.db_update()
 
-			set_accumulated_depreciation(new_asset_depr_schedule_doc, d, ignore_booked_entry=True)
+			new_asset_depr_schedule_doc.set_accumulated_depreciation(d, ignore_booked_entry=True)
 			for asset_data in depr_schedule:
 				if not asset_data.journal_entry:
 					asset_data.db_update()
diff --git a/erpnext/patches/v15_0/create_asset_depreciation_schedules_from_assets.py b/erpnext/patches/v15_0/create_asset_depreciation_schedules_from_assets.py
index 5dc3cdd..371ecbc 100644
--- a/erpnext/patches/v15_0/create_asset_depreciation_schedules_from_assets.py
+++ b/erpnext/patches/v15_0/create_asset_depreciation_schedules_from_assets.py
@@ -1,9 +1,5 @@
 import frappe
 
-from erpnext.assets.doctype.asset_depreciation_schedule.asset_depreciation_schedule import (
-	set_draft_asset_depr_schedule_details,
-)
-
 
 def execute():
 	frappe.reload_doc("assets", "doctype", "Asset Depreciation Schedule")
@@ -16,7 +12,7 @@
 		for fb_row in finance_book_rows:
 			asset_depr_schedule_doc = frappe.new_doc("Asset Depreciation Schedule")
 
-			set_draft_asset_depr_schedule_details(asset_depr_schedule_doc, asset, fb_row)
+			asset_depr_schedule_doc.set_draft_asset_depr_schedule_details(asset, fb_row)
 
 			asset_depr_schedule_doc.insert()