diff --git a/django/template/base.py b/django/template/base.py
index 5e541c3960..ca4202391a 100644
--- a/django/template/base.py
+++ b/django/template/base.py
@@ -65,6 +65,7 @@ from django.utils.safestring import SafeData, SafeString, mark_safe
 from django.utils.text import get_text_list, smart_split, unescape_string_literal
 from django.utils.timezone import template_localtime
 from django.utils.translation import gettext_lazy, pgettext_lazy
+from django.utils.version import PY314
 
 from .exceptions import TemplateSyntaxError
 
@@ -92,6 +93,9 @@ tag_re = re.compile(r"({%.*?%}|{{.*?}}|{#.*?#})")
 
 logger = logging.getLogger("django.template")
 
+if PY314:
+    import annotationlib
+
 
 class TokenType(Enum):
     TEXT = 0
@@ -825,9 +829,19 @@ class FilterExpression:
         # Check to see if a decorator is providing the real function.
         func = inspect.unwrap(func)
 
-        args, _, _, defaults, _, _, _ = inspect.getfullargspec(func)
-        alen = len(args)
-        dlen = len(defaults or [])
+        if PY314:
+            sig = inspect.signature(
+                func, annotation_format=annotationlib.Format.FORWARDREF
+            )
+        else:
+            sig = inspect.signature(func)
+        alen = len(sig.parameters)
+
+        non_default_params = [
+            p for p in sig.parameters.values() if p.default is p.empty
+        ]
+        dlen = alen - len(non_default_params)
+
         # Not enough OR Too many
         if plen < (alen - dlen) or plen > alen:
             raise TemplateSyntaxError(
diff --git a/tests/template_tests/test_parser.py b/tests/template_tests/test_parser.py
index 317fb88238..e5dbfb92d6 100644
--- a/tests/template_tests/test_parser.py
+++ b/tests/template_tests/test_parser.py
@@ -3,6 +3,9 @@ Testing some internals of the template processing.
 These are *not* examples to be copied in user code.
 """
 
+import unittest
+from typing import TYPE_CHECKING
+
 from django.template import Library, TemplateSyntaxError
 from django.template.base import (
     FilterExpression,
@@ -15,6 +18,10 @@ from django.template.base import (
 )
 from django.template.defaultfilters import register as filter_library
 from django.test import SimpleTestCase
+from django.utils.version import PY314
+
+if TYPE_CHECKING:
+    from django.utils.safestring import SafeText
 
 
 class ParserTests(SimpleTestCase):
@@ -240,3 +247,17 @@ class ParserTests(SimpleTestCase):
                     FilterExpression(num, p).resolve({})
                 with self.assertRaises(TemplateSyntaxError):
                     FilterExpression(f"0|default:{num}", p).resolve({})
+
+    @unittest.skipUnless(PY314, "Deferred annotations are Python 3.14+ only")
+    def test_register_filter_deferred_annotations(self):
+        register = Library()
+
+        @register.filter("example")
+        def example_filter(value: str, arg: str = "default") -> SafeText:
+            return f"{value}_{arg}"
+
+        result = FilterExpression.args_check(
+            "example", example_filter, ["extra_example"]
+        )
+
+        self.assertTrue(result)