diff --git a/erpnext/controllers/taxes_and_totals.py b/erpnext/controllers/taxes_and_totals.py
index 8e1510a8369..8d24e7a316f 100644
--- a/erpnext/controllers/taxes_and_totals.py
+++ b/erpnext/controllers/taxes_and_totals.py
@@ -323,7 +323,7 @@ class calculate_taxes_and_totals(object):
 		self._set_in_company_currency(self.doc, ["total_taxes_and_charges", "rounding_adjustment"])
 
 		if self.doc.doctype in ["Quotation", "Sales Order", "Delivery Note", "Sales Invoice"]:
-			self.doc.base_grand_total = flt(self.doc.grand_total * self.doc.conversion_rate) \
+			self.doc.base_grand_total = flt(self.doc.grand_total * self.doc.conversion_rate, self.doc.precision("base_grand_total")) \
 				if self.doc.total_taxes_and_charges else self.doc.base_net_total
 		else:
 			self.doc.taxes_and_charges_added = self.doc.taxes_and_charges_deducted = 0.0