diff --git a/homeassistant/components/template/binary_sensor.py b/homeassistant/components/template/binary_sensor.py
index ab7c88e8b8c..bad4a7d7059 100644
--- a/homeassistant/components/template/binary_sensor.py
+++ b/homeassistant/components/template/binary_sensor.py
@@ -14,6 +14,7 @@ from homeassistant.components.binary_sensor import (
     DOMAIN as BINARY_SENSOR_DOMAIN,
     ENTITY_ID_FORMAT,
     PLATFORM_SCHEMA,
+    BinarySensorDeviceClass,
     BinarySensorEntity,
 )
 from homeassistant.const import (
@@ -208,16 +209,18 @@ class BinarySensorTemplate(TemplateEntity, BinarySensorEntity, RestoreEntity):
                 ENTITY_ID_FORMAT, object_id, hass=hass
             )
 
-        self._device_class = config.get(CONF_DEVICE_CLASS)
+        self._device_class: BinarySensorDeviceClass | None = config.get(
+            CONF_DEVICE_CLASS
+        )
         self._template = config[CONF_STATE]
-        self._state = None
+        self._state: bool | None = None
         self._delay_cancel = None
         self._delay_on = None
         self._delay_on_raw = config.get(CONF_DELAY_ON)
         self._delay_off = None
         self._delay_off_raw = config.get(CONF_DELAY_OFF)
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Restore state and register callbacks."""
         if (
             (self._delay_on_raw is not None or self._delay_off_raw is not None)
@@ -283,12 +286,12 @@ class BinarySensorTemplate(TemplateEntity, BinarySensorEntity, RestoreEntity):
         self._delay_cancel = async_call_later(self.hass, delay, _set_state)
 
     @property
-    def is_on(self):
+    def is_on(self) -> bool | None:
         """Return true if sensor is on."""
         return self._state
 
     @property
-    def device_class(self):
+    def device_class(self) -> BinarySensorDeviceClass | None:
         """Return the sensor class of the binary sensor."""
         return self._device_class
 
diff --git a/homeassistant/components/template/light.py b/homeassistant/components/template/light.py
index 807e3e79ef8..f4ad971c1d6 100644
--- a/homeassistant/components/template/light.py
+++ b/homeassistant/components/template/light.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 import voluptuous as vol
 
@@ -197,17 +198,17 @@ class LightTemplate(TemplateEntity, LightEntity):
         self._supports_transition = False
 
     @property
-    def brightness(self):
+    def brightness(self) -> int | None:
         """Return the brightness of the light."""
         return self._brightness
 
     @property
-    def color_temp(self):
+    def color_temp(self) -> int | None:
         """Return the CT color value in mireds."""
         return self._temperature
 
     @property
-    def max_mireds(self):
+    def max_mireds(self) -> int:
         """Return the max mireds value in mireds."""
         if self._max_mireds is not None:
             return self._max_mireds
@@ -215,7 +216,7 @@ class LightTemplate(TemplateEntity, LightEntity):
         return super().max_mireds
 
     @property
-    def min_mireds(self):
+    def min_mireds(self) -> int:
         """Return the min mireds value in mireds."""
         if self._min_mireds is not None:
             return self._min_mireds
@@ -223,27 +224,27 @@ class LightTemplate(TemplateEntity, LightEntity):
         return super().min_mireds
 
     @property
-    def white_value(self):
+    def white_value(self) -> int | None:
         """Return the white value."""
         return self._white_value
 
     @property
-    def hs_color(self):
+    def hs_color(self) -> tuple[float, float] | None:
         """Return the hue and saturation color value [float, float]."""
         return self._color
 
     @property
-    def effect(self):
+    def effect(self) -> str | None:
         """Return the effect."""
         return self._effect
 
     @property
-    def effect_list(self):
+    def effect_list(self) -> list[str] | None:
         """Return the effect list."""
         return self._effect_list
 
     @property
-    def supported_features(self):
+    def supported_features(self) -> int:
         """Flag supported features."""
         supported_features = 0
         if self._level_script is not None:
@@ -261,11 +262,11 @@ class LightTemplate(TemplateEntity, LightEntity):
         return supported_features
 
     @property
-    def is_on(self):
+    def is_on(self) -> bool | None:
         """Return true if device is on."""
         return self._state
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Register callbacks."""
         if self._template:
             self.add_template_attribute(
@@ -345,7 +346,7 @@ class LightTemplate(TemplateEntity, LightEntity):
             )
         await super().async_added_to_hass()
 
-    async def async_turn_on(self, **kwargs):
+    async def async_turn_on(self, **kwargs: Any) -> None:
         """Turn the light on."""
         optimistic_set = False
         # set optimistic states
@@ -448,7 +449,7 @@ class LightTemplate(TemplateEntity, LightEntity):
         if optimistic_set:
             self.async_write_ha_state()
 
-    async def async_turn_off(self, **kwargs):
+    async def async_turn_off(self, **kwargs: Any) -> None:
         """Turn the light off."""
         if ATTR_TRANSITION in kwargs and self._supports_transition is True:
             await self.async_run_script(
diff --git a/homeassistant/components/template/sensor.py b/homeassistant/components/template/sensor.py
index ee1ddfa8c2d..8dcda988e9f 100644
--- a/homeassistant/components/template/sensor.py
+++ b/homeassistant/components/template/sensor.py
@@ -211,7 +211,7 @@ class SensorTemplate(TemplateSensor):
                 ENTITY_ID_FORMAT, object_id, hass=hass
             )
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Register callbacks."""
         self.add_template_attribute(
             "_attr_native_value", self._template, None, self._update_state
diff --git a/homeassistant/components/template/switch.py b/homeassistant/components/template/switch.py
index f04f2b5ba7a..9f282cb9b11 100644
--- a/homeassistant/components/template/switch.py
+++ b/homeassistant/components/template/switch.py
@@ -1,6 +1,8 @@
 """Support for switches which integrates with other components."""
 from __future__ import annotations
 
+from typing import Any
+
 import voluptuous as vol
 
 from homeassistant.components.switch import (
@@ -110,7 +112,7 @@ class SwitchTemplate(TemplateEntity, SwitchEntity, RestoreEntity):
         self._template = config.get(CONF_VALUE_TEMPLATE)
         self._on_script = Script(hass, config[ON_ACTION], friendly_name, DOMAIN)
         self._off_script = Script(hass, config[OFF_ACTION], friendly_name, DOMAIN)
-        self._state = False
+        self._state: bool | None = False
 
     @callback
     def _update_state(self, result):
@@ -129,7 +131,7 @@ class SwitchTemplate(TemplateEntity, SwitchEntity, RestoreEntity):
 
         self._state = False
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Register callbacks."""
         if self._template is None:
 
@@ -147,18 +149,18 @@ class SwitchTemplate(TemplateEntity, SwitchEntity, RestoreEntity):
         await super().async_added_to_hass()
 
     @property
-    def is_on(self):
+    def is_on(self) -> bool | None:
         """Return true if device is on."""
         return self._state
 
-    async def async_turn_on(self, **kwargs):
+    async def async_turn_on(self, **kwargs: Any) -> None:
         """Fire the on action."""
         await self.async_run_script(self._on_script, context=self._context)
         if self._template is None:
             self._state = True
             self.async_write_ha_state()
 
-    async def async_turn_off(self, **kwargs):
+    async def async_turn_off(self, **kwargs: Any) -> None:
         """Fire the off action."""
         await self.async_run_script(self._off_script, context=self._context)
         if self._template is None:
@@ -166,6 +168,6 @@ class SwitchTemplate(TemplateEntity, SwitchEntity, RestoreEntity):
             self.async_write_ha_state()
 
     @property
-    def assumed_state(self):
+    def assumed_state(self) -> bool:
         """State is assumed, if no template given."""
         return self._template is None
diff --git a/homeassistant/components/template/vacuum.py b/homeassistant/components/template/vacuum.py
index 5f306bfa5e1..0a74ee5c5fc 100644
--- a/homeassistant/components/template/vacuum.py
+++ b/homeassistant/components/template/vacuum.py
@@ -200,7 +200,7 @@ class TemplateVacuum(TemplateEntity, StateVacuumEntity):
         self._attr_fan_speed_list = config[CONF_FAN_SPEED_LIST]
 
     @property
-    def state(self):
+    def state(self) -> str | None:
         """Return the status of the vacuum cleaner."""
         return self._state
 
@@ -263,7 +263,7 @@ class TemplateVacuum(TemplateEntity, StateVacuumEntity):
                 self._attr_fan_speed_list,
             )
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Register callbacks."""
         if self._template is not None:
             self.add_template_attribute(