diff --git a/homeassistant/components/tasmota/sensor.py b/homeassistant/components/tasmota/sensor.py
index 29144370ae7..39ee97d1648 100644
--- a/homeassistant/components/tasmota/sensor.py
+++ b/homeassistant/components/tasmota/sensor.py
@@ -2,7 +2,6 @@
 from __future__ import annotations
 
 from datetime import datetime
-import logging
 from typing import Any
 
 from hatasmota import const as hc, sensor as tasmota_sensor, status_sensor
@@ -10,7 +9,11 @@ from hatasmota.entity import TasmotaEntity as HATasmotaEntity
 from hatasmota.models import DiscoveryHashType
 
 from homeassistant.components import sensor
-from homeassistant.components.sensor import STATE_CLASS_MEASUREMENT, SensorEntity
+from homeassistant.components.sensor import (
+    STATE_CLASS_MEASUREMENT,
+    STATE_CLASS_TOTAL_INCREASING,
+    SensorEntity,
+)
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
@@ -49,14 +52,11 @@ from homeassistant.const import (
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
-from homeassistant.util import dt as dt_util
 
 from .const import DATA_REMOVE_DISCOVER_COMPONENT
 from .discovery import TASMOTA_DISCOVERY_ENTITY_NEW
 from .mixins import TasmotaAvailability, TasmotaDiscoveryUpdate
 
-_LOGGER = logging.getLogger(__name__)
-
 DEVICE_CLASS = "device_class"
 STATE_CLASS = "state_class"
 ICON = "icon"
@@ -121,7 +121,7 @@ SENSOR_DEVICE_CLASS_ICON_MAP = {
     hc.SENSOR_TODAY: {DEVICE_CLASS: DEVICE_CLASS_ENERGY},
     hc.SENSOR_TOTAL: {
         DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-        STATE_CLASS: STATE_CLASS_MEASUREMENT,
+        STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
     },
     hc.SENSOR_TOTAL_START_TIME: {ICON: "mdi:progress-clock"},
     hc.SENSOR_TVOC: {ICON: "mdi:air-filter"},
@@ -188,7 +188,6 @@ async def async_setup_entry(
 class TasmotaSensor(TasmotaAvailability, TasmotaDiscoveryUpdate, SensorEntity):
     """Representation of a Tasmota sensor."""
 
-    _attr_last_reset = None
     _tasmota_entity: tasmota_sensor.TasmotaSensor
 
     def __init__(self, **kwds: Any) -> None:
@@ -212,17 +211,6 @@ class TasmotaSensor(TasmotaAvailability, TasmotaDiscoveryUpdate, SensorEntity):
             self._state_timestamp = state
         else:
             self._state = state
-        if "last_reset" in kwargs:
-            try:
-                last_reset_dt = dt_util.parse_datetime(kwargs["last_reset"])
-                last_reset = dt_util.as_utc(last_reset_dt) if last_reset_dt else None
-                if last_reset is None:
-                    raise ValueError
-                self._attr_last_reset = last_reset
-            except ValueError:
-                _LOGGER.warning(
-                    "Invalid last_reset timestamp '%s'", kwargs["last_reset"]
-                )
         self.async_write_ha_state()
 
     @property
diff --git a/tests/components/tasmota/test_sensor.py b/tests/components/tasmota/test_sensor.py
index fc1e7fd624b..adb73dcf334 100644
--- a/tests/components/tasmota/test_sensor.py
+++ b/tests/components/tasmota/test_sensor.py
@@ -255,6 +255,9 @@ async def test_indexed_sensor_state_via_mqtt2(hass, mqtt_mock, setup_tasmota):
     state = hass.states.get("sensor.tasmota_energy_total")
     assert state.state == "unavailable"
     assert not state.attributes.get(ATTR_ASSUMED_STATE)
+    assert (
+        state.attributes[sensor.ATTR_STATE_CLASS] == sensor.STATE_CLASS_TOTAL_INCREASING
+    )
 
     async_fire_mqtt_message(hass, "tasmota_49A3BC/tele/LWT", "Online")
     state = hass.states.get("sensor.tasmota_energy_total")
@@ -269,7 +272,6 @@ async def test_indexed_sensor_state_via_mqtt2(hass, mqtt_mock, setup_tasmota):
     )
     state = hass.states.get("sensor.tasmota_energy_total")
     assert state.state == "1.2"
-    assert state.attributes["last_reset"] == "2018-11-23T15:33:47+00:00"
 
     # Test polled state update
     async_fire_mqtt_message(
@@ -279,7 +281,6 @@ async def test_indexed_sensor_state_via_mqtt2(hass, mqtt_mock, setup_tasmota):
     )
     state = hass.states.get("sensor.tasmota_energy_total")
     assert state.state == "5.6"
-    assert state.attributes["last_reset"] == "2018-11-23T16:33:47+00:00"
 
 
 async def test_bad_indexed_sensor_state_via_mqtt(hass, mqtt_mock, setup_tasmota):