diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80ce2a012..de4ccef92 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Restricted the creation of tags to unique names in the tags selector component
 - Changed the redaction of the monetary values in impersonation mode to be based on the scopes of the access
 - Deprecated the `permissions` attribute of the access in favor of the scopes
 - Extended the `GET api/v1/access` endpoint by the scopes
diff --git a/apps/api/src/services/tag/tag.service.ts b/apps/api/src/services/tag/tag.service.ts
index abcf349d9..0f23b03ea 100644
--- a/apps/api/src/services/tag/tag.service.ts
+++ b/apps/api/src/services/tag/tag.service.ts
@@ -10,9 +10,13 @@ export class TagService {
   public constructor(private readonly prismaService: PrismaService) {}
 
   public async createTag(data: Prisma.TagCreateInput) {
-    return this.prismaService.tag.create({
-      data
-    });
+    try {
+      return await this.prismaService.tag.create({
+        data
+      });
+    } catch (error) {
+      throw this.getExceptionForError(error);
+    }
   }
 
   public async deleteTag(where: Prisma.TagWhereUniqueInput): Promise<Tag> {
@@ -121,10 +125,14 @@ export class TagService {
     data: Prisma.TagUpdateInput;
     where: Prisma.TagWhereUniqueInput;
   }): Promise<Tag> {
-    return this.prismaService.tag.update({
-      data,
-      where
-    });
+    try {
+      return await this.prismaService.tag.update({
+        data,
+        where
+      });
+    } catch (error) {
+      throw this.getExceptionForError(error);
+    }
   }
 
   public async validateTagIds({
@@ -180,4 +188,18 @@ export class TagService {
 
     return this.validateTagIds({ tagIds, userId });
   }
+
+  private getExceptionForError(error: unknown) {
+    if (
+      error instanceof Prisma.PrismaClientKnownRequestError &&
+      error.code === 'P2002'
+    ) {
+      return new HttpException(
+        getReasonPhrase(StatusCodes.CONFLICT),
+        StatusCodes.CONFLICT
+      );
+    }
+
+    return error;
+  }
 }
diff --git a/libs/ui/src/lib/tags-selector/tags-selector.component.html b/libs/ui/src/lib/tags-selector/tags-selector.component.html
index 9bede09a7..b8a2c372d 100644
--- a/libs/ui/src/lib/tags-selector/tags-selector.component.html
+++ b/libs/ui/src/lib/tags-selector/tags-selector.component.html
@@ -55,12 +55,12 @@
             </mat-option>
           }
 
-          @if (hasPermissionToCreateTag && tagInputControl.value) {
-            <mat-option [value]="tagInputControl.value.trim()">
+          @if (hasPermissionToCreateTag && tagNameToCreate()) {
+            <mat-option [value]="tagNameToCreate()">
               <span class="align-items-center d-flex">
                 <ion-icon class="mr-2" name="add-circle-outline" />
                 <ng-container i18n>Create</ng-container> "{{
-                  tagInputControl.value.trim()
+                  tagNameToCreate()
                 }}"
               </span>
             </mat-option>
diff --git a/libs/ui/src/lib/tags-selector/tags-selector.component.ts b/libs/ui/src/lib/tags-selector/tags-selector.component.ts
index 0e97e12fd..acd0d8d3b 100644
--- a/libs/ui/src/lib/tags-selector/tags-selector.component.ts
+++ b/libs/ui/src/lib/tags-selector/tags-selector.component.ts
@@ -72,6 +72,7 @@ export class GfTagsSelectorComponent
   );
   public readonly separatorKeysCodes: number[] = [COMMA, ENTER];
   public readonly tagInputControl = new FormControl('');
+  public readonly tagNameToCreate = signal<string | null>(null);
   public readonly tagsSelected = signal<SelectedTag[]>([]);
 
   private readonly tagInput =
@@ -80,8 +81,8 @@ export class GfTagsSelectorComponent
   public constructor() {
     this.tagInputControl.valueChanges
       .pipe(takeUntilDestroyed())
-      .subscribe((value) => {
-        this.filteredOptions.next(this.filterTags(value ?? ''));
+      .subscribe(() => {
+        this.updateFilters();
       });
 
     addIcons({ addCircleOutline, closeOutline });
@@ -161,9 +162,8 @@ export class GfTagsSelectorComponent
     this.updateFilters();
   }
 
-  private filterTags(query: string = ''): SelectedTag[] {
-    const tags = this.tagsSelected() ?? [];
-    const tagIds = [...tags, ...(this.tagsReadOnly ?? [])].map(({ id }) => {
+  private filterTags(query: string): SelectedTag[] {
+    const tagIds = this.getTagsSelectedAndReadOnly().map(({ id }) => {
       return id;
     });
 
@@ -179,6 +179,27 @@ export class GfTagsSelectorComponent
       });
   }
 
+  private getTagNameToCreate(query: string): string | null {
+    const name = query.trim();
+
+    if (!name) {
+      return null;
+    }
+
+    const isExistingTagName = [
+      ...(this.tagsAvailable ?? []),
+      ...this.getTagsSelectedAndReadOnly()
+    ].some((tag) => {
+      return tag.name.toLowerCase() === name.toLowerCase();
+    });
+
+    return isExistingTagName ? null : name;
+  }
+
+  private getTagsSelectedAndReadOnly(): SelectedTag[] {
+    return [...this.tagsSelected(), ...(this.tagsReadOnly ?? [])];
+  }
+
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
   private onChange = (_value: SelectedTag[]): void => {
     // ControlValueAccessor onChange callback
@@ -189,6 +210,9 @@ export class GfTagsSelectorComponent
   };
 
   private updateFilters() {
-    this.filteredOptions.next(this.filterTags());
+    const query = this.tagInputControl.value ?? '';
+
+    this.filteredOptions.next(this.filterTags(query));
+    this.tagNameToCreate.set(this.getTagNameToCreate(query));
   }
 }