diff --git a/server/job/job-costing.js b/server/job/job-costing.js
index d1fe8b3d7..2e8d7d417 100644
--- a/server/job/job-costing.js
+++ b/server/job/job-costing.js
@@ -405,7 +405,7 @@ function GenerateCostingData(job) {
             ) {
               const discountRate =
                 Math.abs(job.parts_tax_rates[val.part_type.toUpperCase()].prt_discp) > 1
-                  ? job.parts_tax_rates_rates[val.part_type.toUpperCase()].prt_discp
+                  ? job.parts_tax_rates[val.part_type.toUpperCase()].prt_discp
                   : job.parts_tax_rates[val.part_type.toUpperCase()].prt_discp * 100;
               const disc = partsAmount.percentage(discountRate).multiply(-1);
               partsAmount = partsAmount.add(disc);