diff --git a/erpnext/accounts/doctype/payment_entry/payment_entry.py b/erpnext/accounts/doctype/payment_entry/payment_entry.py
index ee4d4d2..082128a 100644
--- a/erpnext/accounts/doctype/payment_entry/payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/payment_entry.py
@@ -1693,7 +1693,10 @@
 ):
 	reference_doc = None
 	doc = frappe.get_doc(dt, dn)
-	if dt in ("Sales Order", "Purchase Order") and flt(doc.per_billed, 2) >= 99.99:
+	over_billing_allowance = frappe.db.get_single_value("Accounts Settings", "over_billing_allowance")
+	if dt in ("Sales Order", "Purchase Order") and flt(doc.per_billed, 2) >= (
+		100.0 + over_billing_allowance
+	):
 		frappe.throw(_("Can only make payment against unbilled {0}").format(dt))
 
 	if not party_type: