diff --git a/erpnext/selling/doctype/sales_order/sales_order.js b/erpnext/selling/doctype/sales_order/sales_order.js
index 449d461..e9a6cc3 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.js
+++ b/erpnext/selling/doctype/sales_order/sales_order.js
@@ -264,7 +264,7 @@
 					}
 				}
 				// payment request
-				if(flt(doc.per_billed)<100) {
+				if(flt(doc.per_billed, precision('per_billed', doc)) < 100 + frappe.boot.sysdefaults.over_billing_allowance) {
 					this.frm.add_custom_button(__('Payment Request'), () => this.make_payment_request(), __('Create'));
 					this.frm.add_custom_button(__('Payment'), () => this.make_payment_entry(), __('Create'));
 				}
diff --git a/erpnext/startup/boot.py b/erpnext/startup/boot.py
index 62936fc..db1cc49 100644
--- a/erpnext/startup/boot.py
+++ b/erpnext/startup/boot.py
@@ -21,6 +21,10 @@
 		bootinfo.sysdefaults.allow_stale = cint(
 			frappe.db.get_single_value("Accounts Settings", "allow_stale")
 		)
+		bootinfo.sysdefaults.over_billing_allowance = frappe.db.get_single_value(
+			"Accounts Settings", "over_billing_allowance"
+		)
+
 		bootinfo.sysdefaults.quotation_valid_till = cint(
 			frappe.db.get_single_value("CRM Settings", "default_valid_till")
 		)