diff --git a/app/Domains/Auth/Models/User.php b/app/Domains/Auth/Models/User.php
index 226ff59..621da0c 100644
--- a/app/Domains/Auth/Models/User.php
+++ b/app/Domains/Auth/Models/User.php
@@ -2,27 +2,49 @@
 
 namespace App\Domains\Auth\Models;
 
+use App\Domains\Authorization\Models\Role;
+use App\Domains\Tenant\Models\Tenant;
 use Database\Factories\UserFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Attributes\Hidden;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
+use LogicException;
 
-#[Fillable(['nombre_apellido', 'email', 'password', 'dni', 'telefono', 'google_id'])]
+#[Fillable(['nombre_apellido', 'email', 'password', 'dni', 'telefono', 'google_id', 'rol_codigo', 'tenant_codigo'])]
 #[Hidden(['password', 'remember_token'])]
 class User extends Authenticatable
 {
     /** @use HasFactory<UserFactory> */
     use HasApiTokens, HasFactory, Notifiable;
 
+    protected $attributes = [
+        'rol_codigo' => 'user',
+    ];
+
     protected static function newFactory(): UserFactory
     {
         return UserFactory::new();
     }
 
+    protected static function booted(): void
+    {
+        static::saving(function (User $user): void {
+            $hasTenant = $user->tenant_codigo !== null;
+            $isTenantAdmin = $user->rol_codigo === 'tenant_admin';
+
+            if ($hasTenant !== $isTenantAdmin) {
+                throw new LogicException(
+                    'tenant_codigo debe estar informado únicamente para usuarios con rol tenant_admin.'
+                );
+            }
+        });
+    }
+
     /** @return HasMany<ResetPasswordAttempt, $this> */
     public function resetPasswordAttempts(): HasMany
     {
@@ -35,6 +57,22 @@ class User extends Authenticatable
         return $this->hasMany(LoginAttempt::class);
     }
 
+    /**
+     * @return BelongsTo<Role, $this>
+     */
+    public function role(): BelongsTo
+    {
+        return $this->belongsTo(Role::class, 'rol_codigo', 'codigo');
+    }
+
+    /**
+     * @return BelongsTo<Tenant, $this>
+     */
+    public function tenant(): BelongsTo
+    {
+        return $this->belongsTo(Tenant::class, 'tenant_codigo', 'codigo');
+    }
+
     /**
      * @return array<string, string>
      */
diff --git a/app/Domains/Auth/Resources/UserResource.php b/app/Domains/Auth/Resources/UserResource.php
index d666514..89cee51 100644
--- a/app/Domains/Auth/Resources/UserResource.php
+++ b/app/Domains/Auth/Resources/UserResource.php
@@ -2,11 +2,12 @@
 
 namespace App\Domains\Auth\Resources;
 
+use App\Domains\Auth\Models\User;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
 
 /**
- * @mixin \App\Domains\Auth\Models\User
+ * @mixin User
  */
 class UserResource extends JsonResource
 {
@@ -21,6 +22,8 @@ class UserResource extends JsonResource
             'email' => $this->email,
             'dni' => $this->dni,
             'telefono' => $this->telefono,
+            'rol_codigo' => $this->rol_codigo,
+            'tenant_codigo' => $this->tenant_codigo,
         ];
     }
 }
diff --git a/app/Domains/Authorization/Models/Role.php b/app/Domains/Authorization/Models/Role.php
index bc9abc0..1ac419a 100644
--- a/app/Domains/Authorization/Models/Role.php
+++ b/app/Domains/Authorization/Models/Role.php
@@ -2,8 +2,10 @@
 
 namespace App\Domains\Authorization\Models;
 
+use App\Domains\Auth\Models\User;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Role extends Model
 {
@@ -29,4 +31,12 @@ class Role extends Model
             'codigo'
         )->withTimestamps();
     }
+
+    /**
+     * @return HasMany<User, $this>
+     */
+    public function users(): HasMany
+    {
+        return $this->hasMany(User::class, 'rol_codigo', 'codigo');
+    }
 }
diff --git a/database/migrations/2026_07_28_000100_add_role_and_tenant_codes_to_users_table.php b/database/migrations/2026_07_28_000100_add_role_and_tenant_codes_to_users_table.php
new file mode 100644
index 0000000..afd24de
--- /dev/null
+++ b/database/migrations/2026_07_28_000100_add_role_and_tenant_codes_to_users_table.php
@@ -0,0 +1,63 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        $now = now();
+
+        DB::table('roles')->insertOrIgnore([
+            [
+                'codigo' => 'admin',
+                'nombre' => 'Administrador general',
+                'descripcion' => 'Administra la plataforma y todos sus tenants.',
+                'created_at' => $now,
+                'updated_at' => $now,
+            ],
+            [
+                'codigo' => 'tenant_admin',
+                'nombre' => 'Administrador del tenant',
+                'descripcion' => 'Administra la operación de su propio tenant.',
+                'created_at' => $now,
+                'updated_at' => $now,
+            ],
+            [
+                'codigo' => 'user',
+                'nombre' => 'Usuario',
+                'descripcion' => 'Cliente final limitado a sus propios datos y operaciones.',
+                'created_at' => $now,
+                'updated_at' => $now,
+            ],
+        ]);
+
+        Schema::table('users', function (Blueprint $table): void {
+            $table->string('rol_codigo')->default('user')->after('id');
+            $table->string('tenant_codigo')->nullable()->after('rol_codigo');
+
+            $table->foreign('rol_codigo')
+                ->references('codigo')
+                ->on('roles')
+                ->cascadeOnUpdate()
+                ->restrictOnDelete();
+            $table->foreign('tenant_codigo')
+                ->references('codigo')
+                ->on('tenants')
+                ->cascadeOnUpdate()
+                ->restrictOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table): void {
+            $table->dropForeign(['tenant_codigo']);
+            $table->dropForeign(['rol_codigo']);
+            $table->dropColumn(['tenant_codigo', 'rol_codigo']);
+        });
+    }
+};
diff --git a/docs/authorization.md b/docs/authorization.md
index 19e5784..f811c85 100644
--- a/docs/authorization.md
+++ b/docs/authorization.md
@@ -7,6 +7,12 @@ afectar las reglas de autorización.
 Los permisos administrativos deben evaluarse siempre dentro del tenant correspondiente.
 El rol `admin` es la única excepción porque su alcance es toda la plataforma.
 
+Cada registro de `users` contiene:
+
+- `rol_codigo`: código obligatorio del rol. Su valor predeterminado es `user`.
+- `tenant_codigo`: código nullable del tenant. Solamente se utiliza para usuarios con
+  rol `tenant_admin`; para `admin` y `user` debe permanecer en `null`.
+
 ## Roles
 
 | Código | Nombre | Alcance |
diff --git a/tests/Feature/Auth/UserAuthorizationRelationsTest.php b/tests/Feature/Auth/UserAuthorizationRelationsTest.php
new file mode 100644
index 0000000..73b6924
--- /dev/null
+++ b/tests/Feature/Auth/UserAuthorizationRelationsTest.php
@@ -0,0 +1,106 @@
+<?php
+
+namespace Tests\Feature\Auth;
+
+use App\Domains\Attachable\Enums\AttachmentType;
+use App\Domains\Attachable\Models\Attachment;
+use App\Domains\Auth\Models\User;
+use App\Domains\Authorization\Models\Role;
+use App\Domains\Tenant\Models\Tenant;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Schema;
+use LogicException;
+use Tests\TestCase;
+
+class UserAuthorizationRelationsTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_users_table_has_role_and_tenant_codes(): void
+    {
+        $this->assertTrue(Schema::hasColumns('users', [
+            'rol_codigo',
+            'tenant_codigo',
+        ]));
+    }
+
+    public function test_a_new_user_has_the_user_role_and_no_tenant_by_default(): void
+    {
+        $user = User::factory()->create();
+
+        $this->assertSame('user', $user->rol_codigo);
+        $this->assertNull($user->tenant_codigo);
+        $this->assertSame('user', $user->role->codigo);
+        $this->assertNull($user->tenant);
+    }
+
+    public function test_a_tenant_admin_belongs_to_its_role_and_tenant(): void
+    {
+        $tenant = $this->createTenant();
+        $user = User::factory()->create([
+            'rol_codigo' => 'tenant_admin',
+            'tenant_codigo' => $tenant->codigo,
+        ]);
+
+        $this->assertSame('tenant_admin', $user->role->codigo);
+        $this->assertTrue($user->tenant->is($tenant));
+        $this->assertTrue(
+            Role::query()
+                ->where('codigo', 'tenant_admin')
+                ->firstOrFail()
+                ->users
+                ->contains($user)
+        );
+    }
+
+    public function test_only_a_tenant_admin_can_have_a_tenant_code(): void
+    {
+        $tenant = $this->createTenant();
+
+        $this->expectException(LogicException::class);
+
+        User::factory()->create([
+            'rol_codigo' => 'user',
+            'tenant_codigo' => $tenant->codigo,
+        ]);
+    }
+
+    public function test_a_tenant_admin_must_have_a_tenant_code(): void
+    {
+        $this->expectException(LogicException::class);
+
+        User::factory()->create([
+            'rol_codigo' => 'tenant_admin',
+        ]);
+    }
+
+    private function createTenant(): Tenant
+    {
+        $headerLogo = $this->createAttachment('header.png');
+        $footerLogo = $this->createAttachment('footer.png');
+
+        return Tenant::query()->create([
+            'codigo' => 'acme',
+            'nombre' => 'Acme',
+            'dominio' => 'acme.test',
+            'primary_color' => '#111111',
+            'secondary_color' => '#222222',
+            'danger_color' => '#333333',
+            'success_color' => '#444444',
+            'header_bg_color' => '#ffffff',
+            'footer_bg_color' => '#ffffff',
+            'header_logo_id' => $headerLogo->id,
+            'footer_logo_id' => $footerLogo->id,
+        ]);
+    }
+
+    private function createAttachment(string $filename): Attachment
+    {
+        return Attachment::query()->create([
+            'path' => "test/{$filename}",
+            'filename' => $filename,
+            'type' => AttachmentType::Image,
+            'mime_type' => 'image/png',
+        ]);
+    }
+}