diff --git a/src/main/java/com/ongil/backend/domain/pricealert/dto/request/PriceAlertRequest.java b/src/main/java/com/ongil/backend/domain/pricealert/dto/request/PriceAlertRequest.java
index 7a29a4c..0ea4c1e 100644
--- a/src/main/java/com/ongil/backend/domain/pricealert/dto/request/PriceAlertRequest.java
+++ b/src/main/java/com/ongil/backend/domain/pricealert/dto/request/PriceAlertRequest.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotNull;
-import jakarta.validation.constraints.Positive;
 import lombok.Getter;
 
 @Getter
@@ -13,8 +12,7 @@ public class PriceAlertRequest {
 	@Schema(description = "상품 ID", example = "1")
 	private Long productId;
 
-	@NotNull(message = "목표 가격은 필수입니다.")
-	@Positive(message = "목표 가격은 양수여야 합니다.")
-	@Schema(description = "목표 가격 (사용자가 선택한 할인가)", example = "47500")
-	private Integer targetPrice;
+	@NotNull(message = "할인율은 필수입니다.")
+	@Schema(description = "할인율 (10, 20, 30, 40 중 선택)", example = "20", allowableValues = {"10", "20", "30", "40"})
+	private Integer discountRate;
 }
\ No newline at end of file
diff --git a/src/main/java/com/ongil/backend/domain/pricealert/service/PriceAlertService.java b/src/main/java/com/ongil/backend/domain/pricealert/service/PriceAlertService.java
index f78b523..912167b 100644
--- a/src/main/java/com/ongil/backend/domain/pricealert/service/PriceAlertService.java
+++ b/src/main/java/com/ongil/backend/domain/pricealert/service/PriceAlertService.java
@@ -43,9 +43,12 @@ public PriceAlert createOrUpdatePriceAlert(Long userId, PriceAlertRequest reques
 		priceAlertRepository.findByUserIdAndProductIdAndIsActiveTrue(userId, request.getProductId())
 			.ifPresent(PriceAlert::deactivate);
 
+		// 할인율로 목표 가격 계산
+		int targetPrice = product.getPrice() * (100 - request.getDiscountRate()) / 100;
+
 		// 새 건 생성
 		PriceAlert priceAlert = PriceAlert.builder()
-			.targetPrice(request.getTargetPrice())
+			.targetPrice(targetPrice)
 			.isActive(true)
 			.user(user)
 			.product(product)