diff --git a/src/dotnet-user-secrets/CommandLineOptions.cs b/src/dotnet-user-secrets/CommandLineOptions.cs
index 6ce543cc00..8495b6de9d 100644
--- a/src/dotnet-user-secrets/CommandLineOptions.cs
+++ b/src/dotnet-user-secrets/CommandLineOptions.cs
@@ -50,6 +50,7 @@ namespace Microsoft.Extensions.SecretManager.Tools
             app.Command("remove", c => RemoveCommand.Configure(c, options));
             app.Command("list", c => ListCommand.Configure(c, options));
             app.Command("clear", c => ClearCommand.Configure(c, options));
+            app.Command("init", c => InitCommandFactory.Configure(c, options));
 
             // Show help information if no subcommand/option was specified.
             app.OnExecute(() => app.ShowHelp());
diff --git a/src/dotnet-user-secrets/Internal/InitCommand.cs b/src/dotnet-user-secrets/Internal/InitCommand.cs
new file mode 100644
index 0000000000..670da42c4e
--- /dev/null
+++ b/src/dotnet-user-secrets/Internal/InitCommand.cs
@@ -0,0 +1,126 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.IO;
+using System.Linq;
+using System.Xml.Linq;
+using System.Xml.XPath;
+using Microsoft.Extensions.CommandLineUtils;
+
+namespace Microsoft.Extensions.SecretManager.Tools.Internal
+{
+    // Workaround used to handle the fact that the options have not been parsed at configuration time
+    public class InitCommandFactory : ICommand
+    {
+        public CommandLineOptions Options { get; }
+
+        internal static void Configure(CommandLineApplication command, CommandLineOptions options)
+        {
+            command.Description = "Set a user secrets ID to enable secret storage";
+            command.HelpOption();
+
+            command.OnExecute(() =>
+            {
+                options.Command = new InitCommandFactory(options);
+            });
+        }
+
+        public InitCommandFactory(CommandLineOptions options)
+        {
+            Options = options;
+        }
+
+        public void Execute(CommandContext context)
+        {
+            new InitCommand(Options.Id, Options.Project).Execute(context);
+        }
+
+        public void Execute(CommandContext context, string workingDirectory)
+        {
+            new InitCommand(Options.Id, Options.Project).Execute(context, workingDirectory);
+        }
+    }
+
+    public class InitCommand : ICommand
+    {
+        public string OverrideId { get; }
+        public string ProjectPath { get; }
+        public string WorkingDirectory { get; private set; } = Directory.GetCurrentDirectory();
+
+        public InitCommand(string id, string project)
+        {
+            OverrideId = id;
+            ProjectPath = project;
+        }
+
+        public void Execute(CommandContext context, string workingDirectory)
+        {
+            WorkingDirectory = workingDirectory;
+            Execute(context);
+        }
+
+        public void Execute(CommandContext context)
+        {
+            var projectPath = ResolveProjectPath(ProjectPath, WorkingDirectory);
+
+            // Load the project file as XML
+            var projectDocument = XDocument.Load(projectPath);
+
+            // Accept the `--id` CLI option to the main app
+            string newSecretsId = string.IsNullOrWhiteSpace(OverrideId)
+                ? Guid.NewGuid().ToString()
+                : OverrideId;
+
+            // Confirm secret ID does not contain invalid characters
+            if (Path.GetInvalidPathChars().Any(invalidChar => newSecretsId.Contains(invalidChar)))
+            {
+                throw new ArgumentException(Resources.FormatError_InvalidSecretsId(newSecretsId));
+            }
+
+            var existingUserSecretsId = projectDocument.XPathSelectElements("//UserSecretsId").FirstOrDefault();
+
+            // Check if a UserSecretsId is already set
+            if (existingUserSecretsId != default)
+            {
+                // Only set the UserSecretsId if the user specified an explicit value
+                if (string.IsNullOrWhiteSpace(OverrideId))
+                {
+                    context.Reporter.Output(Resources.FormatMessage_ProjectAlreadyInitialized(projectPath));
+                    return;
+                }
+
+                existingUserSecretsId.SetValue(newSecretsId);
+            }
+            else
+            {
+                // Find the first non-conditional PropertyGroup
+                var propertyGroup = projectDocument.Root.DescendantNodes()
+                    .FirstOrDefault(node => node is XElement el
+                        && el.Name == "PropertyGroup"
+                        && el.Attributes().All(attr =>
+                            attr.Name != "Condition")) as XElement;
+
+                // No valid property group, create a new one
+                if (propertyGroup == null)
+                {
+                    propertyGroup = new XElement("PropertyGroup");
+                    projectDocument.Root.AddFirst(propertyGroup);
+                }
+
+                // Add UserSecretsId element
+                propertyGroup.Add(new XElement("UserSecretsId", newSecretsId));
+            }
+
+            projectDocument.Save(projectPath);
+
+            context.Reporter.Output(Resources.FormatMessage_SetUserSecretsIdForProject(newSecretsId, projectPath));
+        }
+
+        private static string ResolveProjectPath(string name, string path)
+        {
+            var finder = new MsBuildProjectFinder(path);
+            return finder.FindMsBuildProject(name);
+        }
+    }
+}
diff --git a/src/dotnet-user-secrets/Program.cs b/src/dotnet-user-secrets/Program.cs
index 187e40128f..710756eb88 100644
--- a/src/dotnet-user-secrets/Program.cs
+++ b/src/dotnet-user-secrets/Program.cs
@@ -71,6 +71,12 @@ namespace Microsoft.Extensions.SecretManager.Tools
 
             var reporter = CreateReporter(options.IsVerbose);
 
+            if (options.Command is InitCommandFactory initCmd)
+            {
+                initCmd.Execute(new CommandContext(null, reporter, _console), _workingDirectory);
+                return 0;
+            }
+
             string userSecretsId;
             try
             {
diff --git a/src/dotnet-user-secrets/Properties/Resources.Designer.cs b/src/dotnet-user-secrets/Properties/Resources.Designer.cs
index a75fc0108f..8ee2a8f38e 100644
--- a/src/dotnet-user-secrets/Properties/Resources.Designer.cs
+++ b/src/dotnet-user-secrets/Properties/Resources.Designer.cs
@@ -15,16 +15,14 @@ namespace Microsoft.Extensions.SecretManager.Tools
         /// </summary>
         internal static string Error_Command_Failed
         {
-            get { return GetString("Error_Command_Failed"); }
+            get => GetString("Error_Command_Failed");
         }
 
         /// <summary>
         /// Command failed : {message}
         /// </summary>
         internal static string FormatError_Command_Failed(object message)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Error_Command_Failed", "message"), message);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_Command_Failed", "message"), message);
 
         /// <summary>
         /// Missing parameter value for '{name}'.
@@ -32,7 +30,7 @@ namespace Microsoft.Extensions.SecretManager.Tools
         /// </summary>
         internal static string Error_MissingArgument
         {
-            get { return GetString("Error_MissingArgument"); }
+            get => GetString("Error_MissingArgument");
         }
 
         /// <summary>
@@ -40,202 +38,218 @@ namespace Microsoft.Extensions.SecretManager.Tools
         /// Use the '--help' flag to see info.
         /// </summary>
         internal static string FormatError_MissingArgument(object name)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Error_MissingArgument", "name"), name);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_MissingArgument", "name"), name);
 
         /// <summary>
         /// Cannot find '{key}' in the secret store.
         /// </summary>
         internal static string Error_Missing_Secret
         {
-            get { return GetString("Error_Missing_Secret"); }
+            get => GetString("Error_Missing_Secret");
         }
 
         /// <summary>
         /// Cannot find '{key}' in the secret store.
         /// </summary>
         internal static string FormatError_Missing_Secret(object key)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Error_Missing_Secret", "key"), key);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_Missing_Secret", "key"), key);
 
         /// <summary>
         /// Multiple MSBuild project files found in '{projectPath}'. Specify which to use with the --project option.
         /// </summary>
         internal static string Error_MultipleProjectsFound
         {
-            get { return GetString("Error_MultipleProjectsFound"); }
+            get => GetString("Error_MultipleProjectsFound");
         }
 
         /// <summary>
         /// Multiple MSBuild project files found in '{projectPath}'. Specify which to use with the --project option.
         /// </summary>
         internal static string FormatError_MultipleProjectsFound(object projectPath)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Error_MultipleProjectsFound", "projectPath"), projectPath);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_MultipleProjectsFound", "projectPath"), projectPath);
 
         /// <summary>
         /// No secrets configured for this application.
         /// </summary>
         internal static string Error_No_Secrets_Found
         {
-            get { return GetString("Error_No_Secrets_Found"); }
+            get => GetString("Error_No_Secrets_Found");
         }
 
         /// <summary>
         /// No secrets configured for this application.
         /// </summary>
         internal static string FormatError_No_Secrets_Found()
-        {
-            return GetString("Error_No_Secrets_Found");
-        }
+            => GetString("Error_No_Secrets_Found");
 
         /// <summary>
         /// Could not find a MSBuild project file in '{projectPath}'. Specify which project to use with the --project option.
         /// </summary>
         internal static string Error_NoProjectsFound
         {
-            get { return GetString("Error_NoProjectsFound"); }
+            get => GetString("Error_NoProjectsFound");
         }
 
         /// <summary>
         /// Could not find a MSBuild project file in '{projectPath}'. Specify which project to use with the --project option.
         /// </summary>
         internal static string FormatError_NoProjectsFound(object projectPath)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Error_NoProjectsFound", "projectPath"), projectPath);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_NoProjectsFound", "projectPath"), projectPath);
 
         /// <summary>
         /// Could not find the global property 'UserSecretsId' in MSBuild project '{project}'. Ensure this property is set in the project or use the '--id' command line option.
         /// </summary>
         internal static string Error_ProjectMissingId
         {
-            get { return GetString("Error_ProjectMissingId"); }
+            get => GetString("Error_ProjectMissingId");
         }
 
         /// <summary>
         /// Could not find the global property 'UserSecretsId' in MSBuild project '{project}'. Ensure this property is set in the project or use the '--id' command line option.
         /// </summary>
         internal static string FormatError_ProjectMissingId(object project)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Error_ProjectMissingId", "project"), project);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_ProjectMissingId", "project"), project);
 
         /// <summary>
         /// The project file '{path}' does not exist.
         /// </summary>
         internal static string Error_ProjectPath_NotFound
         {
-            get { return GetString("Error_ProjectPath_NotFound"); }
+            get => GetString("Error_ProjectPath_NotFound");
         }
 
         /// <summary>
         /// The project file '{path}' does not exist.
         /// </summary>
         internal static string FormatError_ProjectPath_NotFound(object path)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Error_ProjectPath_NotFound", "path"), path);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_ProjectPath_NotFound", "path"), path);
 
         /// <summary>
         /// Could not load the MSBuild project '{project}'.
         /// </summary>
         internal static string Error_ProjectFailedToLoad
         {
-            get { return GetString("Error_ProjectFailedToLoad"); }
+            get => GetString("Error_ProjectFailedToLoad");
         }
 
         /// <summary>
         /// Could not load the MSBuild project '{project}'.
         /// </summary>
         internal static string FormatError_ProjectFailedToLoad(object project)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Error_ProjectFailedToLoad", "project"), project);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_ProjectFailedToLoad", "project"), project);
 
         /// <summary>
         /// Project file path {project}.
         /// </summary>
         internal static string Message_Project_File_Path
         {
-            get { return GetString("Message_Project_File_Path"); }
+            get => GetString("Message_Project_File_Path");
         }
 
         /// <summary>
         /// Project file path {project}.
         /// </summary>
         internal static string FormatMessage_Project_File_Path(object project)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Message_Project_File_Path", "project"), project);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Message_Project_File_Path", "project"), project);
 
         /// <summary>
         /// Successfully saved {key} = {value} to the secret store.
         /// </summary>
         internal static string Message_Saved_Secret
         {
-            get { return GetString("Message_Saved_Secret"); }
+            get => GetString("Message_Saved_Secret");
         }
 
         /// <summary>
         /// Successfully saved {key} = {value} to the secret store.
         /// </summary>
         internal static string FormatMessage_Saved_Secret(object key, object value)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Message_Saved_Secret", "key", "value"), key, value);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Message_Saved_Secret", "key", "value"), key, value);
 
         /// <summary>
         /// Successfully saved {number} secrets to the secret store.
         /// </summary>
         internal static string Message_Saved_Secrets
         {
-            get { return GetString("Message_Saved_Secrets"); }
+            get => GetString("Message_Saved_Secrets");
         }
 
         /// <summary>
         /// Successfully saved {number} secrets to the secret store.
         /// </summary>
         internal static string FormatMessage_Saved_Secrets(object number)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Message_Saved_Secrets", "number"), number);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Message_Saved_Secrets", "number"), number);
 
         /// <summary>
         /// Secrets file path {secretsFilePath}.
         /// </summary>
         internal static string Message_Secret_File_Path
         {
-            get { return GetString("Message_Secret_File_Path"); }
+            get => GetString("Message_Secret_File_Path");
         }
 
         /// <summary>
         /// Secrets file path {secretsFilePath}.
         /// </summary>
         internal static string FormatMessage_Secret_File_Path(object secretsFilePath)
-        {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Message_Secret_File_Path", "secretsFilePath"), secretsFilePath);
-        }
+            => string.Format(CultureInfo.CurrentCulture, GetString("Message_Secret_File_Path", "secretsFilePath"), secretsFilePath);
 
         /// <summary>
         /// {key} = {value}
         /// </summary>
         internal static string Message_Secret_Value_Format
         {
-            get { return GetString("Message_Secret_Value_Format"); }
+            get => GetString("Message_Secret_Value_Format");
         }
 
         /// <summary>
         /// {key} = {value}
         /// </summary>
         internal static string FormatMessage_Secret_Value_Format(object key, object value)
+            => string.Format(CultureInfo.CurrentCulture, GetString("Message_Secret_Value_Format", "key", "value"), key, value);
+
+        /// <summary>
+        /// The UserSecretsId '{userSecretsId}' cannot contain any characters that cannot be used in a file path.
+        /// </summary>
+        internal static string Error_InvalidSecretsId
         {
-            return string.Format(CultureInfo.CurrentCulture, GetString("Message_Secret_Value_Format", "key", "value"), key, value);
+            get => GetString("Error_InvalidSecretsId");
         }
 
+        /// <summary>
+        /// The UserSecretsId '{userSecretsId}' cannot contain any characters that cannot be used in a file path.
+        /// </summary>
+        internal static string FormatError_InvalidSecretsId(object userSecretsId)
+            => string.Format(CultureInfo.CurrentCulture, GetString("Error_InvalidSecretsId", "userSecretsId"), userSecretsId);
+
+        /// <summary>
+        /// The MSBuild project '{project}' has already been initialized with a UserSecretsId.
+        /// </summary>
+        internal static string Message_ProjectAlreadyInitialized
+        {
+            get => GetString("Message_ProjectAlreadyInitialized");
+        }
+
+        /// <summary>
+        /// The MSBuild project '{project}' has already been initialized with a UserSecretsId.
+        /// </summary>
+        internal static string FormatMessage_ProjectAlreadyInitialized(object project)
+            => string.Format(CultureInfo.CurrentCulture, GetString("Message_ProjectAlreadyInitialized", "project"), project);
+
+        /// <summary>
+        /// Set UserSecretsId to '{userSecretsId}' for MSBuild project '{project}'.
+        /// </summary>
+        internal static string Message_SetUserSecretsIdForProject
+        {
+            get => GetString("Message_SetUserSecretsIdForProject");
+        }
+
+        /// <summary>
+        /// Set UserSecretsId to '{userSecretsId}' for MSBuild project '{project}'.
+        /// </summary>
+        internal static string FormatMessage_SetUserSecretsIdForProject(object userSecretsId, object project)
+            => string.Format(CultureInfo.CurrentCulture, GetString("Message_SetUserSecretsIdForProject", "userSecretsId", "project"), userSecretsId, project);
+
         private static string GetString(string name, params string[] formatterNames)
         {
             var value = _resourceManager.GetString(name);
diff --git a/src/dotnet-user-secrets/Resources.resx b/src/dotnet-user-secrets/Resources.resx
index c9222930fc..bfcdf99c2a 100644
--- a/src/dotnet-user-secrets/Resources.resx
+++ b/src/dotnet-user-secrets/Resources.resx
@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <root>
-  <!--
-    Microsoft ResX Schema
-
+  <!-- 
+    Microsoft ResX Schema 
+    
     Version 2.0
-
-    The primary goals of this format is to allow a simple XML format
-    that is mostly human readable. The generation and parsing of the
-    various data types are done through the TypeConverter classes
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
     associated with the data types.
-
+    
     Example:
-
+    
     ... ado.net/XML headers & schema ...
     <resheader name="resmimetype">text/microsoft-resx</resheader>
     <resheader name="version">2.0</resheader>
@@ -26,36 +26,36 @@
         <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
         <comment>This is a comment</comment>
     </data>
-
-    There are any number of "resheader" rows that contain simple
+                
+    There are any number of "resheader" rows that contain simple 
     name/value pairs.
-
-    Each data row contains a name, and value. The row also contains a
-    type or mimetype. Type corresponds to a .NET class that support
-    text/value conversion through the TypeConverter architecture.
-    Classes that don't support this are serialized and stored with the
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
     mimetype set.
-
-    The mimetype is used for serialized objects, and tells the
-    ResXResourceReader how to depersist the object. This is currently not
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
     extensible. For a given mimetype the value must be set accordingly:
-
-    Note - application/x-microsoft.net.object.binary.base64 is the format
-    that the ResXResourceWriter will generate, however the reader can
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
     read any of the formats listed below.
-
+    
     mimetype: application/x-microsoft.net.object.binary.base64
-    value   : The object must be serialized with
+    value   : The object must be serialized with 
             : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
-
+    
     mimetype: application/x-microsoft.net.object.soap.base64
-    value   : The object must be serialized with
+    value   : The object must be serialized with 
             : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
             : and then encoded with base64 encoding.
 
     mimetype: application/x-microsoft.net.object.bytearray.base64
-    value   : The object must be serialized into a byte array
+    value   : The object must be serialized into a byte array 
             : using a System.ComponentModel.TypeConverter
             : and then encoded with base64 encoding.
     -->
@@ -160,4 +160,13 @@ Use the '--help' flag to see info.</value>
   <data name="Message_Secret_Value_Format" xml:space="preserve">
     <value>{key} = {value}</value>
   </data>
+  <data name="Error_InvalidSecretsId" xml:space="preserve">
+    <value>The UserSecretsId '{userSecretsId}' cannot contain any characters that cannot be used in a file path.</value>
+  </data>
+  <data name="Message_ProjectAlreadyInitialized" xml:space="preserve">
+    <value>The MSBuild project '{project}' has already been initialized with a UserSecretsId.</value>
+  </data>
+  <data name="Message_SetUserSecretsIdForProject" xml:space="preserve">
+    <value>Set UserSecretsId to '{userSecretsId}' for MSBuild project '{project}'.</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/test/dotnet-user-secrets.Tests/InitCommandTest.cs b/test/dotnet-user-secrets.Tests/InitCommandTest.cs
new file mode 100644
index 0000000000..d1558e8811
--- /dev/null
+++ b/test/dotnet-user-secrets.Tests/InitCommandTest.cs
@@ -0,0 +1,119 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.IO;
+using System.Text;
+using Microsoft.Extensions.Configuration.UserSecrets.Tests;
+using Microsoft.Extensions.SecretManager.Tools.Internal;
+using Microsoft.Extensions.Tools.Internal;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Microsoft.Extensions.SecretManager.Tools.Tests
+{
+    public class InitCommandTests : IClassFixture<UserSecretsTestFixture>
+    {
+        private UserSecretsTestFixture _fixture;
+        private ITestOutputHelper _output;
+        private TestConsole _console;
+        private StringBuilder _textOutput;
+
+        public InitCommandTests(UserSecretsTestFixture fixture, ITestOutputHelper output)
+        {
+            _fixture = fixture;
+            _output = output;
+            _textOutput = new StringBuilder();
+
+            _console = new TestConsole(output)
+            {
+                Error = new StringWriter(_textOutput),
+                Out = new StringWriter(_textOutput),
+            };
+        }
+
+        private CommandContext MakeCommandContext() => new CommandContext(null, new TestReporter(_output), _console);
+
+        [Fact]
+        public void AddsSecretIdToProject()
+        {
+            var projectDir = _fixture.CreateProject(null);
+
+            new InitCommand(null, null).Execute(MakeCommandContext(), projectDir);
+
+            var idResolver = new ProjectIdResolver(MakeCommandContext().Reporter, projectDir);
+
+            Assert.False(string.IsNullOrWhiteSpace(idResolver.Resolve(null, null)));
+        }
+
+        [Fact]
+        public void AddsSpecificSecretIdToProject()
+        {
+            const string SecretId = "TestSecretId";
+
+            var projectDir = _fixture.CreateProject(null);
+
+            new InitCommand(SecretId, null).Execute(MakeCommandContext(), projectDir);
+
+            var idResolver = new ProjectIdResolver(MakeCommandContext().Reporter, projectDir);
+
+            Assert.Equal(SecretId, idResolver.Resolve(null, null));
+        }
+
+        [Fact]
+        public void AddsEscapedSpecificSecretIdToProject()
+        {
+            const string SecretId = @"<lots of XML invalid values>&";
+
+            var projectDir = _fixture.CreateProject(null);
+
+            new InitCommand(SecretId, null).Execute(MakeCommandContext(), projectDir);
+
+            var idResolver = new ProjectIdResolver(MakeCommandContext().Reporter, projectDir);
+
+            Assert.Equal(SecretId, idResolver.Resolve(null, null));
+        }
+
+        [Fact]
+        public void DoesNotGenerateIdForProjectWithSecretId()
+        {
+            const string SecretId = "AlreadyExists";
+
+            var projectDir = _fixture.CreateProject(SecretId);
+
+            new InitCommand(null, null).Execute(MakeCommandContext(), projectDir);
+
+            var idResolver = new ProjectIdResolver(MakeCommandContext().Reporter, projectDir);
+
+            Assert.Equal(SecretId, idResolver.Resolve(null, null));
+        }
+
+        [Fact]
+        public void OverridesIdForProjectWithSecretId()
+        {
+            const string SecretId = "AlreadyExists";
+            const string NewId = "TestValue";
+
+            var projectDir = _fixture.CreateProject(SecretId);
+
+            new InitCommand(NewId, null).Execute(MakeCommandContext(), projectDir);
+
+            var idResolver = new ProjectIdResolver(MakeCommandContext().Reporter, projectDir);
+
+            Assert.Equal(NewId, idResolver.Resolve(null, null));
+        }
+
+        [Fact]
+        public void FailsForInvalidId()
+        {
+            string secretId = $"invalid{Path.GetInvalidPathChars()[0]}secret-id";
+
+            var projectDir = _fixture.CreateProject(null);
+
+            Assert.Throws<ArgumentException>(() =>
+            {
+                new InitCommand(secretId, null).Execute(MakeCommandContext(), projectDir);
+            });
+        }
+    }
+}
diff --git a/test/dotnet-user-secrets.Tests/SecretManagerTests.cs b/test/dotnet-user-secrets.Tests/SecretManagerTests.cs
index ee7ca55247..3a390d4439 100644
--- a/test/dotnet-user-secrets.Tests/SecretManagerTests.cs
+++ b/test/dotnet-user-secrets.Tests/SecretManagerTests.cs
@@ -323,5 +323,18 @@ namespace Microsoft.Extensions.SecretManager.Tools.Tests
             secretManager.RunInternal(args);
             Assert.Contains(Resources.Error_No_Secrets_Found, _output.ToString());
         }
+
+        [Fact]
+        public void Init_When_Project_Has_No_Secrets_Id()
+        {
+            var projectPath = _fixture.CreateProject(null);
+            var project = Path.Combine(projectPath, "TestProject.csproj");
+            var secretManager = new Program(_console, projectPath);
+
+            secretManager.RunInternal("init", "-p", project);
+
+            Assert.DoesNotContain(Resources.FormatError_ProjectMissingId(project), _output.ToString());
+            Assert.DoesNotContain("--help", _output.ToString());
+        }
     }
-}
\ No newline at end of file
+}