diff --git a/inventory-server/dashboard/acot-server/routes/discounts.js b/inventory-server/dashboard/acot-server/routes/discounts.js
index 634b0b0..02c008b 100644
--- a/inventory-server/dashboard/acot-server/routes/discounts.js
+++ b/inventory-server/dashboard/acot-server/routes/discounts.js
@@ -174,7 +174,25 @@ router.post('/simulate', async (req, res) => {
   const endDt = parseDate(dateRange.end, endDefault).endOf('day');
 
   const shipCountry = filters.shipCountry || 'US';
-  const promoIds = Array.isArray(filters.promoIds) ? filters.promoIds.filter(Boolean) : [];
+  const rawPromoFilters = [
+    ...(Array.isArray(filters.promoIds) ? filters.promoIds : []),
+    ...(Array.isArray(filters.promoCodes) ? filters.promoCodes : []),
+  ];
+  const promoCodes = Array.from(
+    new Set(
+      rawPromoFilters
+        .map((value) => {
+          if (typeof value === 'string') {
+            return value.trim();
+          }
+          if (typeof value === 'number') {
+            return String(value);
+          }
+          return '';
+        })
+        .filter((value) => value.length > 0)
+    )
+  );
 
   const config = {
     merchantFeePercent: typeof merchantFeePercent === 'number' ? merchantFeePercent : DEFAULTS.merchantFeePercent,
@@ -222,13 +240,17 @@ router.post('/simulate', async (req, res) => {
       formatDateForSql(startDt),
       formatDateForSql(endDt)
     ];
-    const promoJoin = promoIds.length > 0
+    const promoJoin = promoCodes.length > 0
       ? 'JOIN order_discounts od ON od.order_id = o.order_id AND od.discount_active = 1 AND od.discount_type = 10'
       : '';
 
-    if (promoIds.length > 0) {
-      params.push(promoIds);
+    let promoFilterClause = '';
+    if (promoCodes.length > 0) {
+      const placeholders = promoCodes.map(() => '?').join(',');
+      promoFilterClause = `AND od.discount_code IN (${placeholders})`;
+      params.push(...promoCodes);
     }
+
     params.push(formatDateForSql(startDt), formatDateForSql(endDt));
 
     const filteredOrdersQuery = `
@@ -249,7 +271,7 @@ router.post('/simulate', async (req, res) => {
         AND o.ship_method_selected <> 'holdit'
         AND o.ship_country = ?
         AND o.date_placed BETWEEN ? AND ?
-        ${promoIds.length > 0 ? 'AND od.discount_code IN (?)' : ''}
+        ${promoFilterClause}
     `;
 
     const bucketQuery = `
diff --git a/inventory/src/pages/DiscountSimulator.tsx b/inventory/src/pages/DiscountSimulator.tsx
index 338911c..c899a8a 100644
--- a/inventory/src/pages/DiscountSimulator.tsx
+++ b/inventory/src/pages/DiscountSimulator.tsx
@@ -124,6 +124,13 @@ export function DiscountSimulator() {
 
   const promosLoading = !promosQuery.data && promosQuery.isLoading;
 
+  const selectedPromoCode = useMemo(() => {
+    if (selectedPromoId == null) {
+      return undefined;
+    }
+    return promosQuery.data?.find((promo) => promo.id === selectedPromoId)?.code || undefined;
+  }, [promosQuery.data, selectedPromoId]);
+
   const createPayload = useCallback((): DiscountSimulationRequest => {
     const { from, to } = ensureDateRange(dateRange);
 
@@ -135,6 +142,7 @@ export function DiscountSimulator() {
       filters: {
         shipCountry: 'US',
         promoIds: selectedPromoId ? [selectedPromoId] : undefined,
+        promoCodes: selectedPromoCode ? [selectedPromoCode] : undefined,
       },
       productPromo,
       shippingPromo,
@@ -151,7 +159,17 @@ export function DiscountSimulator() {
         pointDollarValue: pointsConfig.pointDollarValue,
       },
     };
-  }, [dateRange, selectedPromoId, productPromo, shippingPromo, shippingTiers, merchantFeePercent, fixedCostPerOrder, pointsConfig]);
+  }, [
+    dateRange,
+    selectedPromoId,
+    selectedPromoCode,
+    productPromo,
+    shippingPromo,
+    shippingTiers,
+    merchantFeePercent,
+    fixedCostPerOrder,
+    pointsConfig,
+  ]);
 
   const simulationMutation = useMutation<
     DiscountSimulationResponse,
diff --git a/inventory/src/types/discount-simulator.ts b/inventory/src/types/discount-simulator.ts
index ffd3ddb..46ace22 100644
--- a/inventory/src/types/discount-simulator.ts
+++ b/inventory/src/types/discount-simulator.ts
@@ -72,7 +72,8 @@ export interface DiscountSimulationRequest {
   };
   filters: {
     shipCountry?: string;
-    promoIds?: number[];
+    promoIds?: Array<number | string>;
+    promoCodes?: string[];
   };
   productPromo: {
     type: DiscountPromoType;