diff --git a/core/serializers/auth.py b/core/serializers/auth.py
index 8e31f2e..822e321 100644
--- a/core/serializers/auth.py
+++ b/core/serializers/auth.py
@@ -6,6 +6,7 @@
 from allauth.account.utils import setup_user_email
 from django.conf import settings
 from django.contrib.auth import get_user_model
+from django.contrib.auth.models import User
 from django.core.cache import cache
 from django.db.models import Model
 from django.db.transaction import atomic
@@ -38,6 +39,7 @@
 from core.tasks.facade import notify_user_ip_changed
 from core.utils.auth import RegisterUserCheck
 from exchange.loggers import DynamicFieldFilter
+from exchange.settings.kyc import IS_KYC_REQUIRED
 from lib.serializers import LANG_FIELD
 from lib.utils import generate_random_string
 
@@ -272,6 +274,8 @@ def validate(self, attrs):
                     'token': current_token
                 })
 
+            self.validate_kyc(user)
+
             attrs['user'] = user
             captcher.set_captcha_passed()
 
@@ -320,6 +324,18 @@ def validate(self, attrs):
 
         return attrs
 
+    def validate_kyc(self, user: User) -> None:
+        if not exchange.settings.kyc.IS_KYC_REQUIRED:
+            return
+        if not UserKYC.valid_for_user(user):
+            msg = _('Unable to log in due to KYC restrictions.')
+            raise ValidationError(
+                {
+                    'message': msg,
+                    'type': 'kyc'
+                }
+            )
+
 
 class RegisterSerializer(BaseRegisterSerializer):
     first_name = serializers.CharField(required=True)
@@ -499,4 +515,4 @@ def get_kyc_enabled(self, obj):
         return settings.IS_KYC_ENABLED
 
     def get_sms_enabled(self, obj):
-        return settings.IS_SMS_ENABLED
\ No newline at end of file
+        return settings.IS_SMS_ENABLED
diff --git a/exchange/settings/kyc.py b/exchange/settings/kyc.py
index e16e560..a8f1bb2 100644
--- a/exchange/settings/kyc.py
+++ b/exchange/settings/kyc.py
@@ -1,6 +1,7 @@
 from exchange.settings import env
 
 IS_KYC_ENABLED = env('IS_KYC_ENABLED', default=False)
+IS_KYC_REQUIRED = env('IS_KYC_REQUIRED', default=False)
 SUMSUB_SECRET_KEY = env('SUMSUB_SECRET_KEY')
 SUMSUB_APP_TOKEN = env('SUMSUB_APP_TOKEN')
 SUMSUM_CALLBACK_VALIDATION_SECRET = env('SUMSUM_CALLBACK_VALIDATION_SECRET')