diff --git a/homeassistant/components/modbus/fan.py b/homeassistant/components/modbus/fan.py
index cf5c9762db8..349ae0d0619 100644
--- a/homeassistant/components/modbus/fan.py
+++ b/homeassistant/components/modbus/fan.py
@@ -2,11 +2,13 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 from homeassistant.components.fan import FanEntity
 from homeassistant.const import CONF_NAME
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers.typing import ConfigType
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from . import get_hub
 from .base_platform import BaseSwitch
@@ -18,8 +20,11 @@ _LOGGER = logging.getLogger(__name__)
 
 
 async def async_setup_platform(
-    hass: HomeAssistant, config: ConfigType, async_add_entities, discovery_info=None
-):
+    hass: HomeAssistant,
+    config: ConfigType,
+    async_add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Read configuration and create Modbus fans."""
     if discovery_info is None:  # pragma: no cover
         return
@@ -39,13 +44,13 @@ class ModbusFan(BaseSwitch, FanEntity):
         speed: str | None = None,
         percentage: int | None = None,
         preset_mode: str | None = None,
-        **kwargs,
+        **kwargs: Any,
     ) -> None:
         """Set fan on."""
         await self.async_turn(self.command_on)
 
     @property
-    def is_on(self):
+    def is_on(self) -> bool:
         """Return true if fan is on.
 
         This is needed due to the ongoing conversion of fan.
diff --git a/homeassistant/components/modbus/light.py b/homeassistant/components/modbus/light.py
index dd9a8ad754d..f0f2541ad0f 100644
--- a/homeassistant/components/modbus/light.py
+++ b/homeassistant/components/modbus/light.py
@@ -2,11 +2,13 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 from homeassistant.components.light import LightEntity
 from homeassistant.const import CONF_LIGHTS, CONF_NAME
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers.typing import ConfigType
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from . import get_hub
 from .base_platform import BaseSwitch
@@ -17,8 +19,11 @@ _LOGGER = logging.getLogger(__name__)
 
 
 async def async_setup_platform(
-    hass: HomeAssistant, config: ConfigType, async_add_entities, discovery_info=None
-):
+    hass: HomeAssistant,
+    config: ConfigType,
+    async_add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Read configuration and create Modbus lights."""
     if discovery_info is None:  # pragma: no cover
         return
@@ -33,6 +38,6 @@ async def async_setup_platform(
 class ModbusLight(BaseSwitch, LightEntity):
     """Class representing a Modbus light."""
 
-    async def async_turn_on(self, **kwargs):
+    async def async_turn_on(self, **kwargs: Any) -> None:
         """Set light on."""
         await self.async_turn(self.command_on)
diff --git a/homeassistant/components/modbus/switch.py b/homeassistant/components/modbus/switch.py
index 55dc014420f..86cba7c36ff 100644
--- a/homeassistant/components/modbus/switch.py
+++ b/homeassistant/components/modbus/switch.py
@@ -2,11 +2,13 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 from homeassistant.components.switch import SwitchEntity
 from homeassistant.const import CONF_NAME, CONF_SWITCHES
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers.typing import ConfigType
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from . import get_hub
 from .base_platform import BaseSwitch
@@ -17,8 +19,11 @@ _LOGGER = logging.getLogger(__name__)
 
 
 async def async_setup_platform(
-    hass: HomeAssistant, config: ConfigType, async_add_entities, discovery_info=None
-):
+    hass: HomeAssistant,
+    config: ConfigType,
+    async_add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Read configuration and create Modbus switches."""
     switches = []
 
@@ -34,6 +39,6 @@ async def async_setup_platform(
 class ModbusSwitch(BaseSwitch, SwitchEntity):
     """Base class representing a Modbus switch."""
 
-    async def async_turn_on(self, **kwargs):
+    async def async_turn_on(self, **kwargs: Any) -> None:
         """Set switch on."""
         await self.async_turn(self.command_on)