diff --git a/homeassistant/components/filter/sensor.py b/homeassistant/components/filter/sensor.py
index 97412823b30..c40c703b846 100644
--- a/homeassistant/components/filter/sensor.py
+++ b/homeassistant/components/filter/sensor.py
@@ -405,7 +405,7 @@ class Filter:
         :param entity: used for debugging only
         """
         if isinstance(window_size, int):
-            self.states = deque(maxlen=window_size)
+            self.states: deque = deque(maxlen=window_size)
             self.window_unit = WINDOW_SIZE_UNIT_NUMBER_EVENTS
         else:
             self.states = deque(maxlen=0)
@@ -476,7 +476,7 @@ class RangeFilter(Filter, SensorEntity):
         super().__init__(FILTER_NAME_RANGE, precision=precision, entity=entity)
         self._lower_bound = lower_bound
         self._upper_bound = upper_bound
-        self._stats_internal = Counter()
+        self._stats_internal: Counter = Counter()
 
     def _filter_state(self, new_state):
         """Implement the range filter."""
@@ -522,7 +522,7 @@ class OutlierFilter(Filter, SensorEntity):
         """
         super().__init__(FILTER_NAME_OUTLIER, window_size, precision, entity)
         self._radius = radius
-        self._stats_internal = Counter()
+        self._stats_internal: Counter = Counter()
         self._store_raw = True
 
     def _filter_state(self, new_state):
diff --git a/mypy.ini b/mypy.ini
index 9c54f7a043f..4ad0dc9235f 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1349,9 +1349,6 @@ ignore_errors = true
 [mypy-homeassistant.components.evohome.*]
 ignore_errors = true
 
-[mypy-homeassistant.components.filter.*]
-ignore_errors = true
-
 [mypy-homeassistant.components.fireservicerota.*]
 ignore_errors = true
 
diff --git a/script/hassfest/mypy_config.py b/script/hassfest/mypy_config.py
index e3b76747be2..38409ef8457 100644
--- a/script/hassfest/mypy_config.py
+++ b/script/hassfest/mypy_config.py
@@ -42,7 +42,6 @@ IGNORED_MODULES: Final[list[str]] = [
     "homeassistant.components.enphase_envoy.*",
     "homeassistant.components.entur_public_transport.*",
     "homeassistant.components.evohome.*",
-    "homeassistant.components.filter.*",
     "homeassistant.components.fireservicerota.*",
     "homeassistant.components.firmata.*",
     "homeassistant.components.flo.*",