diff --git a/client/src/components/bill-form/bill-form.lines.component.jsx b/client/src/components/bill-form/bill-form.lines.component.jsx
index fd565097d..73b0a21a9 100644
--- a/client/src/components/bill-form/bill-form.lines.component.jsx
+++ b/client/src/components/bill-form/bill-form.lines.component.jsx
@@ -90,6 +90,7 @@ export function BillEnterModalLinesComponent({
     });
   };
 
+  // Only fill actual_cost when the user forward-tabs out of Retail (actual_price)
   const autofillActualCost = (index) => {
     Promise.resolve().then(() => {
       const retailRaw = form.getFieldValue(["billlines", index, "actual_price"]);
@@ -164,10 +165,9 @@ export function BillEnterModalLinesComponent({
             }}
             allowRemoved={form.getFieldValue("is_credit_memo") || false}
             onSelect={(value, opt) => {
-              const d = normalizeDiscount(discount);
-              const retail = Number(opt.cost);
-              const computedActual = Number.isFinite(retail) ? round2(retail * (1 - d)) : null;
-
+              // IMPORTANT:
+              // Do NOT autofill actual_cost here. It should only fill when the user forward-tabs
+              // from Retail (actual_price) -> Actual Cost (actual_cost).
               setFieldsValue({
                 billlines: (getFieldValue("billlines") || []).map((item, idx) => {
                   if (idx !== index) return item;
@@ -178,7 +178,7 @@ export function BillEnterModalLinesComponent({
                     quantity: opt.part_qty || 1,
                     actual_price: opt.cost,
                     original_actual_price: opt.cost,
-                    actual_cost: isBlank(item.actual_cost) ? computedActual : item.actual_cost,
+                    // actual_cost intentionally untouched here
                     cost_center: opt.part_type
                       ? bodyshopHasDmsKey(bodyshop)
                         ? opt.part_type !== "PAE"
@@ -251,10 +251,9 @@ export function BillEnterModalLinesComponent({
           <CurrencyInput
             min={0}
             disabled={disabled}
-            // TODO: Removed at customers request
-            // onBlur={() => autofillActualCost(index)}
+            // NOTE: Autofill should only happen on forward Tab out of Retail
             onKeyDown={(e) => {
-              if (e.key === "Tab") autofillActualCost(index);
+              if (e.key === "Tab" && !e.shiftKey) autofillActualCost(index);
             }}
           />
         ),
@@ -330,10 +329,7 @@ export function BillEnterModalLinesComponent({
                     disabled={disabled}
                     controls={false}
                     style={{ width: "100%", height: CONTROL_HEIGHT }}
-                    // TODO: Removed at customers request
-                    // NOTE: onFocus autofill behavior disabled per user request (revert to tab-only behavior)
-                    // This can be re-enabled as a user preference in the future
-                    // onFocus={() => autofillActualCost(index)}
+                    // NOTE: No auto-fill on focus/blur; only triggered from Retail on Tab
                   />
                 </Form.Item>
               </div>