diff --git a/taxes_az/taxes_az/report/agricultural_goods_stock_report/agricultural_goods_stock_report.py b/taxes_az/taxes_az/report/agricultural_goods_stock_report/agricultural_goods_stock_report.py
index 4c622bd..e32821c 100644
--- a/taxes_az/taxes_az/report/agricultural_goods_stock_report/agricultural_goods_stock_report.py
+++ b/taxes_az/taxes_az/report/agricultural_goods_stock_report/agricultural_goods_stock_report.py
@@ -237,24 +237,30 @@ def get_data(filters=None):
 	purchases = _fetch_rows("Purchase Invoice", "Purchase Invoice Item", company, to_date)
 	sales = _fetch_rows("Sales Invoice", "Sales Invoice Item", company, to_date)
 
-	# Opening balance = cumulative (purchases - sales) before the period start.
+	# Pick the cost-of-goods-sold method from the company's Default Stock
+	# Valuation Method. Moving Average -> weighted average, otherwise FIFO.
+	valuation_method = _get_valuation_method(company)
+
+	def cogs(start, end):
+		if valuation_method == "Moving Average":
+			return _avg_sold_purchase_price(purchases, sales, start, end)
+		return _fifo_sold_purchase_price(purchases, sales, start, end)
+
+	# Opening balance = cost (purchase price) of stock still on hand at the
+	# start of the period = all purchases before the period minus the COST of
+	# all goods sold before it. Subtracting sales at COGS (not sale price)
+	# keeps it consistent with the closing balance, so each period's opening
+	# equals the previous period's closing.
 	if from_date:
 		opening_purchases = _sum_gross(purchases, end=_day_before(from_date))
-		opening_sales = _sum_gross(sales, end=_day_before(from_date))
-		opening_balance = opening_purchases - opening_sales
+		opening_cogs = cogs(None, _day_before(from_date))
+		opening_balance = opening_purchases - opening_cogs
 	else:
 		opening_balance = 0.0
 
 	purchased = _sum_gross(purchases, start=from_date, end=to_date)
 	sold = _sum_gross(sales, start=from_date, end=to_date)
-
-	# Pick the cost-of-goods-sold method from the company's Default Stock
-	# Valuation Method. Moving Average -> weighted average, otherwise FIFO.
-	valuation_method = _get_valuation_method(company)
-	if valuation_method == "Moving Average":
-		sold_purchase_price = _avg_sold_purchase_price(purchases, sales, from_date, to_date)
-	else:
-		sold_purchase_price = _fifo_sold_purchase_price(purchases, sales, from_date, to_date)
+	sold_purchase_price = cogs(from_date, to_date)
 
 	# Closing balance at purchase price = opening + purchased - cost of goods
 	# sold (COGS, valued per the company's stock valuation method).