diff --git a/src/inventory/application/services/add_category_service.rs b/src/inventory/application/services/add_category_service.rs
index 4fe8c78..8e16448 100644
--- a/src/inventory/application/services/add_category_service.rs
+++ b/src/inventory/application/services/add_category_service.rs
@@ -10,7 +10,9 @@ use mockall::*;
 
 use super::errors::*;
 use crate::inventory::{
-    application::port::output::db::{category_id_exists::*, category_name_exists_for_store::*},
+    application::port::output::db::{
+        category_id_exists::*, category_name_exists_for_store::*, store_id_exists::*,
+    },
     domain::{
         add_category_command::AddCategoryCommand,
         category_added_event::{CategoryAddedEvent, CategoryAddedEventBuilder},
@@ -29,7 +31,7 @@ pub type AddCategoryServiceObj = Arc<dyn AddCategoryUseCase>;
 
 #[derive(Clone, Builder)]
 pub struct AddCategoryService {
-    // TODO: check if store ID exists
+    db_store_id_exists: StoreIDExistsDBPortObj,
     db_category_name_exists_for_store: CategoryNameExistsForStoreDBPortObj,
     db_category_id_exists: CategoryIDExistsDBPortObj,
     get_uuid: GetUUIDInterfaceObj,
@@ -38,6 +40,14 @@ pub struct AddCategoryService {
 #[async_trait::async_trait]
 impl AddCategoryUseCase for AddCategoryService {
     async fn add_category(&self, cmd: AddCategoryCommand) -> InventoryResult<CategoryAddedEvent> {
+        if !self
+            .db_store_id_exists
+            .store_id_exists(cmd.store_id())
+            .await?
+        {
+            return Err(InventoryError::StoreIDNotFound);
+        }
+
         let mut category_id = self.get_uuid.get_uuid();
 
         loop {
@@ -128,6 +138,7 @@ pub mod tests {
             .unwrap();
 
         let s = AddCategoryServiceBuilder::default()
+            .db_store_id_exists(mock_store_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
             .db_category_name_exists_for_store(mock_category_name_exists_for_store_db_port_false(
                 IS_CALLED_ONLY_ONCE,
             ))
@@ -156,6 +167,7 @@ pub mod tests {
             .unwrap();
 
         let s = AddCategoryServiceBuilder::default()
+            .db_store_id_exists(mock_store_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
             .db_category_name_exists_for_store(mock_category_name_exists_for_store_db_port_true(
                 IS_CALLED_ONLY_ONCE,
             ))
@@ -169,4 +181,31 @@ pub mod tests {
             Err(InventoryError::DuplicateCategoryName)
         )
     }
+
+    #[actix_rt::test]
+    async fn test_service_store_doesnt_exist() {
+        let name = "foo";
+        let description = "bar";
+        let user_id = UUID;
+        let store_id = Uuid::new_v4();
+
+        // description = None
+        let cmd = AddCategoryCommand::new(name.into(), Some(description.into()), store_id, user_id)
+            .unwrap();
+
+        let s = AddCategoryServiceBuilder::default()
+            .db_store_id_exists(mock_store_id_exists_db_port_false(IS_CALLED_ONLY_ONCE))
+            .db_category_name_exists_for_store(mock_category_name_exists_for_store_db_port_false(
+                IS_NEVER_CALLED,
+            ))
+            .db_category_id_exists(mock_category_id_exists_db_port_false(IS_NEVER_CALLED))
+            .get_uuid(mock_get_uuid(IS_NEVER_CALLED))
+            .build()
+            .unwrap();
+
+        assert_eq!(
+            s.add_category(cmd.clone()).await,
+            Err(InventoryError::StoreIDNotFound)
+        )
+    }
 }