diff --git a/homeassistant/components/monzo/sensor.py b/homeassistant/components/monzo/sensor.py
index c77ff34bf325f5..2c8cb4547016d1 100644
--- a/homeassistant/components/monzo/sensor.py
+++ b/homeassistant/components/monzo/sensor.py
@@ -39,6 +39,13 @@ class MonzoSensorEntityDescription(SensorEntityDescription):
         device_class=SensorDeviceClass.MONETARY,
         suggested_display_precision=2,
     ),
+    MonzoSensorEntityDescription(
+        key="spend_today",
+        translation_key="spend_today",
+        value_fn=lambda data: abs(data["balance"]["spend_today"]) / 100,
+        device_class=SensorDeviceClass.MONETARY,
+        suggested_display_precision=2,
+    ),
 )
 
 POT_SENSORS = (
diff --git a/homeassistant/components/monzo/strings.json b/homeassistant/components/monzo/strings.json
index 9aecc53fa2dae5..99616320ce0068 100644
--- a/homeassistant/components/monzo/strings.json
+++ b/homeassistant/components/monzo/strings.json
@@ -57,6 +57,9 @@
       "pot_balance": {
         "name": "[%key:component::monzo::entity::sensor::balance::name%]"
       },
+      "spend_today": {
+        "name": "Spent today"
+      },
       "total_balance": {
         "name": "Total balance"
       }
diff --git a/tests/components/monzo/conftest.py b/tests/components/monzo/conftest.py
index 1d23206f58c46e..db12e5d392d524 100644
--- a/tests/components/monzo/conftest.py
+++ b/tests/components/monzo/conftest.py
@@ -27,13 +27,23 @@
         "id": "acc_curr",
         "name": "Current Account",
         "type": "uk_retail",
-        "balance": {"balance": 123, "total_balance": 321, "currency": "GBP"},
+        "balance": {
+            "balance": 123,
+            "total_balance": 321,
+            "spend_today": -45,
+            "currency": "GBP",
+        },
     },
     {
         "id": "acc_flex",
         "name": "Flex",
         "type": "uk_monzo_flex",
-        "balance": {"balance": 123, "total_balance": 321, "currency": "EUR"},
+        "balance": {
+            "balance": 123,
+            "total_balance": 321,
+            "spend_today": -67,
+            "currency": "EUR",
+        },
     },
 ]
 TEST_POTS = [
diff --git a/tests/components/monzo/snapshots/test_sensor.ambr b/tests/components/monzo/snapshots/test_sensor.ambr
index c7e686ec158640..25aab02720f10b 100644
--- a/tests/components/monzo/snapshots/test_sensor.ambr
+++ b/tests/components/monzo/snapshots/test_sensor.ambr
@@ -55,6 +55,62 @@
     'state': '1.23',
   })
 # ---
+# name: test_all_entities[sensor.current_account_spent_today-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': None,
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.current_account_spent_today',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Spent today',
+    'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 2,
+      }),
+    }),
+    'original_device_class': <SensorDeviceClass.MONETARY: 'monetary'>,
+    'original_icon': None,
+    'original_name': 'Spent today',
+    'platform': 'monzo',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'spend_today',
+    'unique_id': 'acc_curr_spend_today',
+    'unit_of_measurement': 'GBP',
+  })
+# ---
+# name: test_all_entities[sensor.current_account_spent_today-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.ATTRIBUTION: 'attribution'>: 'Data provided by Monzo',
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'monetary',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Current Account Spent today',
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: 'GBP',
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.current_account_spent_today',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '0.45',
+  })
+# ---
 # name: test_all_entities[sensor.current_account_total_balance-entry]
   EntityRegistryEntrySnapshot({
     'aliases': list([
@@ -167,6 +223,62 @@
     'state': '1.23',
   })
 # ---
+# name: test_all_entities[sensor.flex_spent_today-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': None,
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.flex_spent_today',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Spent today',
+    'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 2,
+      }),
+    }),
+    'original_device_class': <SensorDeviceClass.MONETARY: 'monetary'>,
+    'original_icon': None,
+    'original_name': 'Spent today',
+    'platform': 'monzo',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'spend_today',
+    'unique_id': 'acc_flex_spend_today',
+    'unit_of_measurement': 'EUR',
+  })
+# ---
+# name: test_all_entities[sensor.flex_spent_today-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.ATTRIBUTION: 'attribution'>: 'Data provided by Monzo',
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'monetary',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Flex Spent today',
+      <EntityStateAttribute.UNIT_OF_MEASUREMENT: 'unit_of_measurement'>: 'EUR',
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.flex_spent_today',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '0.67',
+  })
+# ---
 # name: test_all_entities[sensor.flex_total_balance-entry]
   EntityRegistryEntrySnapshot({
     'aliases': list([
diff --git a/tests/components/monzo/test_sensor.py b/tests/components/monzo/test_sensor.py
index 2699685bba7d4c..d1204f011d5773 100644
--- a/tests/components/monzo/test_sensor.py
+++ b/tests/components/monzo/test_sensor.py
@@ -29,6 +29,7 @@
 EXPECTED_VALUE_GETTERS = {
     "balance": lambda x: x["balance"]["balance"] / 100,
     "total_balance": lambda x: x["balance"]["total_balance"] / 100,
+    "spend_today": lambda x: abs(x["balance"]["spend_today"]) / 100,
     "pot_balance": lambda x: x["balance"] / 100,
 }