diff --git a/Documentation/rest-api-accounts.txt b/Documentation/rest-api-accounts.txt
index 86f546d..32f8656 100644
--- a/Documentation/rest-api-accounts.txt
+++ b/Documentation/rest-api-accounts.txt
@@ -60,7 +60,7 @@
 [[details]]
 --
 * `DETAILS`: Includes full name, preferred email, username, display
-name, avatars, status and state for each account.
+name, avatars, status, state and tags for each account.
 --
 
 [[all-emails]]
@@ -2302,6 +2302,12 @@
 |`status`          |optional|Status message of the account.
 |`inactive`        |not set if `false`|
 Whether the account is inactive.
+|`tags`      |optional, not set if empty|
+List of additional tags that this account has. The only +
+current tag an account can have is `SERVICE_USER`. +
+Only set if detailed account information is requested. +
+See option link:rest-api-changes.html#detailed-accounts[
+DETAILED_ACCOUNTS]
 |===============================
 
 [[account-input]]
diff --git a/java/com/google/gerrit/acceptance/AccountCreator.java b/java/com/google/gerrit/acceptance/AccountCreator.java
index 44e2d2d..3ab1cec 100644
--- a/java/com/google/gerrit/acceptance/AccountCreator.java
+++ b/java/com/google/gerrit/acceptance/AccountCreator.java
@@ -101,6 +101,7 @@
                     .setPreferredEmail(email)
                     .addExternalIds(extIds));
 
+    ImmutableList.Builder<String> tags = ImmutableList.builder();
     if (groupNames != null) {
       for (String n : groupNames) {
         AccountGroup.NameKey k = AccountGroup.nameKey(n);
@@ -109,10 +110,14 @@
           throw new NoSuchGroupException(n);
         }
         addGroupMember(group.get().getGroupUUID(), id);
+        if ("Service Users".equals(n)) {
+          tags.add("SERVICE_USER");
+        }
       }
     }
 
-    account = TestAccount.create(id, username, email, fullName, displayName, httpPass);
+    account =
+        TestAccount.create(id, username, email, fullName, displayName, httpPass, tags.build());
     if (username != null) {
       accounts.put(username, account);
     }
diff --git a/java/com/google/gerrit/acceptance/TestAccount.java b/java/com/google/gerrit/acceptance/TestAccount.java
index e9c0899..d5908f4 100644
--- a/java/com/google/gerrit/acceptance/TestAccount.java
+++ b/java/com/google/gerrit/acceptance/TestAccount.java
@@ -48,8 +48,10 @@
       @Nullable String email,
       @Nullable String fullName,
       @Nullable String displayName,
-      @Nullable String httpPassword) {
-    return new AutoValue_TestAccount(id, username, email, fullName, displayName, httpPassword);
+      @Nullable String httpPassword,
+      ImmutableList<String> tags) {
+    return new AutoValue_TestAccount(
+        id, username, email, fullName, displayName, httpPassword, tags);
   }
 
   public abstract Account.Id id();
@@ -69,6 +71,8 @@
   @Nullable
   public abstract String httpPassword();
 
+  public abstract ImmutableList<String> tags();
+
   public PersonIdent newIdent() {
     return new PersonIdent(fullName(), email());
   }
diff --git a/java/com/google/gerrit/extensions/common/AccountInfo.java b/java/com/google/gerrit/extensions/common/AccountInfo.java
index 2a3d260..60ba18d 100644
--- a/java/com/google/gerrit/extensions/common/AccountInfo.java
+++ b/java/com/google/gerrit/extensions/common/AccountInfo.java
@@ -27,6 +27,12 @@
  * are defined in {@link AccountDetailInfo}.
  */
 public class AccountInfo {
+  /** Tags are additional properties of an account. */
+  public enum Tag {
+    /** Tag indicating that this account is a service user. */
+    SERVICE_USER
+  }
+
   /** The numeric ID of the account. */
   public Integer _accountId;
 
@@ -67,6 +73,9 @@
   /** Whether the account is inactive. */
   public Boolean inactive;
 
+  /** Tags, such as whether this account is a service user. */
+  public List<Tag> tags;
+
   public AccountInfo(Integer id) {
     this._accountId = id;
   }
@@ -89,7 +98,8 @@
           && Objects.equals(username, accountInfo.username)
           && Objects.equals(avatars, accountInfo.avatars)
           && Objects.equals(_moreAccounts, accountInfo._moreAccounts)
-          && Objects.equals(status, accountInfo.status);
+          && Objects.equals(status, accountInfo.status)
+          && Objects.equals(tags, accountInfo.tags);
     }
     return false;
   }
@@ -102,6 +112,7 @@
         .add("displayname", displayName)
         .add("email", email)
         .add("username", username)
+        .add("tags", tags)
         .toString();
   }
 
@@ -116,7 +127,8 @@
         username,
         avatars,
         _moreAccounts,
-        status);
+        status,
+        tags);
   }
 
   protected AccountInfo() {}
diff --git a/java/com/google/gerrit/server/account/AccountDirectory.java b/java/com/google/gerrit/server/account/AccountDirectory.java
index 63fa551..98b2ca9 100644
--- a/java/com/google/gerrit/server/account/AccountDirectory.java
+++ b/java/com/google/gerrit/server/account/AccountDirectory.java
@@ -51,7 +51,10 @@
     STATE,
 
     /** Human friendly display name presented in the web interface chosen by the user. */
-    DISPLAY_NAME
+    DISPLAY_NAME,
+
+    /** Tags such as weather the account is a service user. */
+    TAGS
   }
 
   public abstract void fillAccountInfo(Iterable<? extends AccountInfo> in, Set<FillOptions> options)
diff --git a/java/com/google/gerrit/server/account/AccountLoader.java b/java/com/google/gerrit/server/account/AccountLoader.java
index 9acf078..c260401 100644
--- a/java/com/google/gerrit/server/account/AccountLoader.java
+++ b/java/com/google/gerrit/server/account/AccountLoader.java
@@ -44,7 +44,8 @@
               FillOptions.DISPLAY_NAME,
               FillOptions.STATUS,
               FillOptions.STATE,
-              FillOptions.AVATARS));
+              FillOptions.AVATARS,
+              FillOptions.TAGS));
 
   public interface Factory {
     AccountLoader create(boolean detailed);
diff --git a/java/com/google/gerrit/server/account/InternalAccountDirectory.java b/java/com/google/gerrit/server/account/InternalAccountDirectory.java
index 3137c95..13b71cf 100644
--- a/java/com/google/gerrit/server/account/InternalAccountDirectory.java
+++ b/java/com/google/gerrit/server/account/InternalAccountDirectory.java
@@ -18,6 +18,7 @@
 import static java.util.stream.Collectors.toSet;
 
 import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Sets;
 import com.google.common.collect.Streams;
 import com.google.gerrit.entities.Account;
@@ -61,6 +62,7 @@
   private final IdentifiedUser.GenericFactory userFactory;
   private final Provider<CurrentUser> self;
   private final PermissionBackend permissionBackend;
+  private final ServiceUserClassifier serviceUserClassifier;
 
   @Inject
   InternalAccountDirectory(
@@ -68,12 +70,14 @@
       DynamicItem<AvatarProvider> avatar,
       IdentifiedUser.GenericFactory userFactory,
       Provider<CurrentUser> self,
-      PermissionBackend permissionBackend) {
+      PermissionBackend permissionBackend,
+      ServiceUserClassifier serviceUserClassifier) {
     this.accountCache = accountCache;
     this.avatar = avatar;
     this.userFactory = userFactory;
     this.self = self;
     this.permissionBackend = permissionBackend;
+    this.serviceUserClassifier = serviceUserClassifier;
   }
 
   @Override
@@ -155,6 +159,13 @@
       info.inactive = account.inactive() ? true : null;
     }
 
+    if (options.contains(FillOptions.TAGS)) {
+      info.tags =
+          serviceUserClassifier.isServiceUser(account.id())
+              ? ImmutableList.of(AccountInfo.Tag.SERVICE_USER)
+              : null;
+    }
+
     if (options.contains(FillOptions.AVATARS)) {
       AvatarProvider ap = avatar.get();
       if (ap != null) {
diff --git a/javatests/com/google/gerrit/acceptance/api/accounts/AccountIT.java b/javatests/com/google/gerrit/acceptance/api/accounts/AccountIT.java
index aaca9e8..1b55652 100644
--- a/javatests/com/google/gerrit/acceptance/api/accounts/AccountIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/accounts/AccountIT.java
@@ -366,6 +366,7 @@
       assertThat(accountInfo.name).isEqualTo(input.name);
       assertThat(accountInfo.email).isEqualTo(input.email);
       assertThat(accountInfo.status).isNull();
+      assertThat(accountInfo.tags).isNull();
 
       Account.Id accountId = Account.id(accountInfo._accountId);
       accountIndexedCounter.assertReindexOf(accountId, 1);
diff --git a/javatests/com/google/gerrit/acceptance/rest/account/AccountAssert.java b/javatests/com/google/gerrit/acceptance/rest/account/AccountAssert.java
index c0feda9..0b0f2ec 100644
--- a/javatests/com/google/gerrit/acceptance/rest/account/AccountAssert.java
+++ b/javatests/com/google/gerrit/acceptance/rest/account/AccountAssert.java
@@ -14,6 +14,7 @@
 
 package com.google.gerrit.acceptance.rest.account;
 
+import static com.google.common.collect.ImmutableList.toImmutableList;
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.common.collect.Iterables;
@@ -35,6 +36,12 @@
     assertThat(accountInfo.displayName).isEqualTo(testAccount.displayName());
     assertThat(accountInfo.email).isEqualTo(testAccount.email());
     assertThat(accountInfo.inactive).isNull();
+    if (testAccount.tags().isEmpty()) {
+      assertThat(accountInfo.tags).isNull();
+    } else {
+      assertThat(accountInfo.tags.stream().map(Enum::name).collect(toImmutableList()))
+          .containsExactlyElementsIn(testAccount.tags());
+    }
   }
 
   /**
diff --git a/javatests/com/google/gerrit/acceptance/rest/account/GetAccountDetailIT.java b/javatests/com/google/gerrit/acceptance/rest/account/GetAccountDetailIT.java
index 9202f42..a5cf3e1 100644
--- a/javatests/com/google/gerrit/acceptance/rest/account/GetAccountDetailIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/account/GetAccountDetailIT.java
@@ -19,11 +19,19 @@
 
 import com.google.gerrit.acceptance.AbstractDaemonTest;
 import com.google.gerrit.acceptance.RestResponse;
+import com.google.gerrit.acceptance.testsuite.account.AccountOperations;
+import com.google.gerrit.acceptance.testsuite.group.GroupOperations;
 import com.google.gerrit.entities.Account;
+import com.google.gerrit.entities.AccountGroup;
 import com.google.gerrit.extensions.common.AccountDetailInfo;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.inject.Inject;
 import org.junit.Test;
 
 public class GetAccountDetailIT extends AbstractDaemonTest {
+  @Inject private GroupOperations groupOperations;
+  @Inject private AccountOperations accountOperations;
+
   @Test
   public void getDetail() throws Exception {
     RestResponse r = adminRestSession.get("/accounts/" + admin.username() + "/detail/");
@@ -32,4 +40,17 @@
     Account account = getAccount(admin.id());
     assertThat(info.registeredOn).isEqualTo(account.registeredOn());
   }
+
+  @Test
+  public void getDetailForServiceUser() throws Exception {
+    Account.Id serviceUser = accountOperations.newAccount().create();
+    groupOperations
+        .group(groupCache.get(AccountGroup.nameKey("Service Users")).get().getGroupUUID())
+        .forUpdate()
+        .addMember(serviceUser)
+        .update();
+    RestResponse r = adminRestSession.get("/accounts/" + serviceUser.get() + "/detail/");
+    AccountDetailInfo info = newGson().fromJson(r.getReader(), AccountDetailInfo.class);
+    assertThat(info.tags).containsExactly(AccountInfo.Tag.SERVICE_USER);
+  }
 }
diff --git a/javatests/com/google/gerrit/acceptance/rest/account/GetAccountIT.java b/javatests/com/google/gerrit/acceptance/rest/account/GetAccountIT.java
index 782638a..2e2f5d9 100644
--- a/javatests/com/google/gerrit/acceptance/rest/account/GetAccountIT.java
+++ b/javatests/com/google/gerrit/acceptance/rest/account/GetAccountIT.java
@@ -67,6 +67,14 @@
     assertThat(accountInfo.inactive).isTrue();
   }
 
+  @Test
+  public void getServiceUserAccount() throws Exception {
+    TestAccount serviceUser =
+        accountCreator.create("robot1", "robot1@example.com", "Ro Bot", "Ro", "Service Users");
+    assertThat(serviceUser.tags()).containsExactly("SERVICE_USER");
+    testGetAccount(serviceUser.id().toString(), serviceUser);
+  }
+
   private void testGetAccount(String id, TestAccount expectedAccount) throws Exception {
     assertAccountInfo(expectedAccount, gApi.accounts().id(id).get());
   }