diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index ec1d25a8e63..9ff1ee0ebf1 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -649,7 +649,9 @@ class PurchaseOrderLine(models.Model):
         order = line.order_id
         price_unit = line.price_unit
         if line.taxes_id:
-            price_unit = line.taxes_id.with_context(round=False).compute_all(price_unit, currency=line.order_id.currency_id, quantity=1.0)['total_excluded']
+            price_unit = line.taxes_id.with_context(round=False).compute_all(
+                price_unit, currency=line.order_id.currency_id, quantity=1.0, product=line.product_id, partner=line.order_id.partner_id
+            )['total_excluded']
         if line.product_uom.id != line.product_id.uom_id.id:
             price_unit *= line.product_uom.factor / line.product_id.uom_id.factor
         if order.currency_id != order.company_id.currency_id: