diff --git a/src/Core/AdminConsole/OrganizationFeatures/Organizations/CloudOrganizationSignUpCommand.cs b/src/Core/AdminConsole/OrganizationFeatures/Organizations/CloudOrganizationSignUpCommand.cs
index 8d8ab8cdfc..0cae0fcc81 100644
--- a/src/Core/AdminConsole/OrganizationFeatures/Organizations/CloudOrganizationSignUpCommand.cs
+++ b/src/Core/AdminConsole/OrganizationFeatures/Organizations/CloudOrganizationSignUpCommand.cs
@@ -75,8 +75,7 @@ public class CloudOrganizationSignUpCommand(
             PlanType = plan!.Type,
             Seats = (short)(plan.PasswordManager.BaseSeats + signup.AdditionalSeats),
             MaxCollections = plan.PasswordManager.MaxCollections,
-            MaxStorageGb = !plan.PasswordManager.BaseStorageGb.HasValue ?
-                (short?)null : (short)(plan.PasswordManager.BaseStorageGb.Value + signup.AdditionalStorageGb),
+            MaxStorageGb = (short)(plan.PasswordManager.BaseStorageGb + signup.AdditionalStorageGb),
             UsePolicies = plan.HasPolicies,
             UseSso = plan.HasSso,
             UseGroups = plan.HasGroups,
diff --git a/src/Core/AdminConsole/OrganizationFeatures/Organizations/ProviderClientOrganizationSignUpCommand.cs b/src/Core/AdminConsole/OrganizationFeatures/Organizations/ProviderClientOrganizationSignUpCommand.cs
index 27e70fbe2d..4a8f08a4f7 100644
--- a/src/Core/AdminConsole/OrganizationFeatures/Organizations/ProviderClientOrganizationSignUpCommand.cs
+++ b/src/Core/AdminConsole/OrganizationFeatures/Organizations/ProviderClientOrganizationSignUpCommand.cs
@@ -73,7 +73,7 @@ public class ProviderClientOrganizationSignUpCommand : IProviderClientOrganizati
             PlanType = plan!.Type,
             Seats = signup.AdditionalSeats,
             MaxCollections = plan.PasswordManager.MaxCollections,
-            MaxStorageGb = 1,
+            MaxStorageGb = plan.PasswordManager.BaseStorageGb,
             UsePolicies = plan.HasPolicies,
             UseSso = plan.HasSso,
             UseOrganizationDomains = plan.HasOrganizationDomains,
diff --git a/src/Core/AdminConsole/Services/Implementations/OrganizationService.cs b/src/Core/AdminConsole/Services/Implementations/OrganizationService.cs
index 1b52ad8cff..f18ecf341b 100644
--- a/src/Core/AdminConsole/Services/Implementations/OrganizationService.cs
+++ b/src/Core/AdminConsole/Services/Implementations/OrganizationService.cs
@@ -148,7 +148,7 @@ public class OrganizationService : IOrganizationService
         }
 
         var secret = await BillingHelpers.AdjustStorageAsync(_paymentService, organization, storageAdjustmentGb,
-            plan.PasswordManager.StripeStoragePlanId);
+            plan.PasswordManager.StripeStoragePlanId, plan.PasswordManager.BaseStorageGb);
         await ReplaceAndUpdateCacheAsync(organization);
         return secret;
     }
diff --git a/src/Core/Billing/Models/StaticStore/Plan.cs b/src/Core/Billing/Models/StaticStore/Plan.cs
index 6d8d00089c..bab64d9879 100644
--- a/src/Core/Billing/Models/StaticStore/Plan.cs
+++ b/src/Core/Billing/Models/StaticStore/Plan.cs
@@ -97,7 +97,7 @@ public abstract record Plan
         public decimal PremiumAccessOptionPrice { get; init; }
         public short? MaxSeats { get; init; }
         // Storage
-        public short? BaseStorageGb { get; init; }
+        public short BaseStorageGb { get; init; }
         public bool HasAdditionalStorageOption { get; init; }
         public decimal AdditionalStoragePricePerGb { get; init; }
         public string StripeStoragePlanId { get; init; }
diff --git a/src/Core/Billing/Premium/Commands/CreatePremiumCloudHostedSubscriptionCommand.cs b/src/Core/Billing/Premium/Commands/CreatePremiumCloudHostedSubscriptionCommand.cs
index 1f752a007b..472f31ac4b 100644
--- a/src/Core/Billing/Premium/Commands/CreatePremiumCloudHostedSubscriptionCommand.cs
+++ b/src/Core/Billing/Premium/Commands/CreatePremiumCloudHostedSubscriptionCommand.cs
@@ -80,6 +80,8 @@ public class CreatePremiumCloudHostedSubscriptionCommand(
             return new BadRequest("Additional storage must be greater than 0.");
         }
 
+        var premiumPlan = await pricingClient.GetAvailablePremiumPlan();
+
         Customer? customer;
 
         /*
@@ -107,7 +109,7 @@ public class CreatePremiumCloudHostedSubscriptionCommand(
 
         customer = await ReconcileBillingLocationAsync(customer, billingAddress);
 
-        var subscription = await CreateSubscriptionAsync(user.Id, customer, additionalStorageGb > 0 ? additionalStorageGb : null);
+        var subscription = await CreateSubscriptionAsync(user.Id, customer, premiumPlan, additionalStorageGb > 0 ? additionalStorageGb : null);
 
         paymentMethod.Switch(
             tokenized =>
@@ -140,7 +142,7 @@ public class CreatePremiumCloudHostedSubscriptionCommand(
         user.Gateway = GatewayType.Stripe;
         user.GatewayCustomerId = customer.Id;
         user.GatewaySubscriptionId = subscription.Id;
-        user.MaxStorageGb = (short)(1 + additionalStorageGb);
+        user.MaxStorageGb = (short)(premiumPlan.Storage.Provided + additionalStorageGb);
         user.LicenseKey = CoreHelpers.SecureRandomString(20);
         user.RevisionDate = DateTime.UtcNow;
 
@@ -304,9 +306,9 @@ public class CreatePremiumCloudHostedSubscriptionCommand(
     private async Task<Subscription> CreateSubscriptionAsync(
         Guid userId,
         Customer customer,
+        Pricing.Premium.Plan premiumPlan,
         int? storage)
     {
-        var premiumPlan = await pricingClient.GetAvailablePremiumPlan();
 
         var subscriptionItemOptionsList = new List<SubscriptionItemOptions>
         {
diff --git a/src/Core/Billing/Pricing/Organizations/PlanAdapter.cs b/src/Core/Billing/Pricing/Organizations/PlanAdapter.cs
index 37dc63cb47..42090a56ca 100644
--- a/src/Core/Billing/Pricing/Organizations/PlanAdapter.cs
+++ b/src/Core/Billing/Pricing/Organizations/PlanAdapter.cs
@@ -99,7 +99,7 @@ public record PlanAdapter : Core.Models.StaticStore.Plan
             _ => true);
         var baseSeats = GetBaseSeats(plan.Seats);
         var maxSeats = GetMaxSeats(plan.Seats);
-        var baseStorageGb = (short?)plan.Storage?.Provided;
+        var baseStorageGb = (short)(plan.Storage?.Provided ?? 0);
         var hasAdditionalStorageOption = plan.Storage != null;
         var additionalStoragePricePerGb = plan.Storage?.Price ?? 0;
         var stripeStoragePlanId = plan.Storage?.StripePriceId;
diff --git a/src/Core/Billing/Pricing/Premium/Purchasable.cs b/src/Core/Billing/Pricing/Premium/Purchasable.cs
index 633eb2e8aa..6bf69d9593 100644
--- a/src/Core/Billing/Pricing/Premium/Purchasable.cs
+++ b/src/Core/Billing/Pricing/Premium/Purchasable.cs
@@ -4,4 +4,5 @@ public class Purchasable
 {
     public string StripePriceId { get; init; } = null!;
     public decimal Price { get; init; }
+    public int Provided { get; init; }
 }
diff --git a/src/Core/Billing/Pricing/PricingClient.cs b/src/Core/Billing/Pricing/PricingClient.cs
index 1ec44c6496..6fdef73885 100644
--- a/src/Core/Billing/Pricing/PricingClient.cs
+++ b/src/Core/Billing/Pricing/PricingClient.cs
@@ -186,6 +186,6 @@ public class PricingClient(
         Available = true,
         LegacyYear = null,
         Seat = new Purchasable { Price = 10M, StripePriceId = StripeConstants.Prices.PremiumAnnually },
-        Storage = new Purchasable { Price = 4M, StripePriceId = StripeConstants.Prices.StoragePlanPersonal }
+        Storage = new Purchasable { Price = 4M, StripePriceId = StripeConstants.Prices.StoragePlanPersonal, Provided = 1 }
     };
 }
diff --git a/src/Core/Billing/Services/Implementations/PremiumUserBillingService.cs b/src/Core/Billing/Services/Implementations/PremiumUserBillingService.cs
index 3170060de4..daa06b907a 100644
--- a/src/Core/Billing/Services/Implementations/PremiumUserBillingService.cs
+++ b/src/Core/Billing/Services/Implementations/PremiumUserBillingService.cs
@@ -101,7 +101,9 @@ public class PremiumUserBillingService(
          */
         customer = await ReconcileBillingLocationAsync(customer, customerSetup.TaxInformation);
 
-        var subscription = await CreateSubscriptionAsync(user.Id, customer, storage);
+        var premiumPlan = await pricingClient.GetAvailablePremiumPlan();
+
+        var subscription = await CreateSubscriptionAsync(user.Id, customer, premiumPlan, storage);
 
         switch (customerSetup.TokenizedPaymentSource)
         {
@@ -119,6 +121,7 @@ public class PremiumUserBillingService(
         user.Gateway = GatewayType.Stripe;
         user.GatewayCustomerId = customer.Id;
         user.GatewaySubscriptionId = subscription.Id;
+        user.MaxStorageGb = (short)(premiumPlan.Storage.Provided + (storage ?? 0));
 
         await userRepository.ReplaceAsync(user);
     }
@@ -301,9 +304,9 @@ public class PremiumUserBillingService(
     private async Task<Subscription> CreateSubscriptionAsync(
         Guid userId,
         Customer customer,
+        Pricing.Premium.Plan premiumPlan,
         int? storage)
     {
-        var premiumPlan = await pricingClient.GetAvailablePremiumPlan();
 
         var subscriptionItemOptionsList = new List<SubscriptionItemOptions>
         {
diff --git a/src/Core/Models/Business/CompleteSubscriptionUpdate.cs b/src/Core/Models/Business/CompleteSubscriptionUpdate.cs
index 7473738ffc..aa49c25d36 100644
--- a/src/Core/Models/Business/CompleteSubscriptionUpdate.cs
+++ b/src/Core/Models/Business/CompleteSubscriptionUpdate.cs
@@ -299,7 +299,7 @@ public class CompleteSubscriptionUpdate : SubscriptionUpdate
                 ? organization.SmServiceAccounts - plan.SecretsManager.BaseServiceAccount
                 : 0,
             PurchasedAdditionalStorage = organization.MaxStorageGb.HasValue
-                ? organization.MaxStorageGb.Value - (plan.PasswordManager.BaseStorageGb ?? 0) :
+                ? organization.MaxStorageGb.Value - plan.PasswordManager.BaseStorageGb :
                 0
         };
 }
diff --git a/src/Core/OrganizationFeatures/OrganizationSubscriptions/UpgradeOrganizationPlanCommand.cs b/src/Core/OrganizationFeatures/OrganizationSubscriptions/UpgradeOrganizationPlanCommand.cs
index 2b39e6cca6..b704cb0460 100644
--- a/src/Core/OrganizationFeatures/OrganizationSubscriptions/UpgradeOrganizationPlanCommand.cs
+++ b/src/Core/OrganizationFeatures/OrganizationSubscriptions/UpgradeOrganizationPlanCommand.cs
@@ -254,9 +254,7 @@ public class UpgradeOrganizationPlanCommand : IUpgradeOrganizationPlanCommand
         organization.UseApi = newPlan.HasApi;
         organization.SelfHost = newPlan.HasSelfHost;
         organization.UsePolicies = newPlan.HasPolicies;
-        organization.MaxStorageGb = !newPlan.PasswordManager.BaseStorageGb.HasValue
-            ? (short?)null
-            : (short)(newPlan.PasswordManager.BaseStorageGb.Value + upgrade.AdditionalStorageGb);
+        organization.MaxStorageGb = (short)(newPlan.PasswordManager.BaseStorageGb + upgrade.AdditionalStorageGb);
         organization.UseGroups = newPlan.HasGroups;
         organization.UseDirectory = newPlan.HasDirectory;
         organization.UseEvents = newPlan.HasEvents;
diff --git a/src/Core/Services/Implementations/UserService.cs b/src/Core/Services/Implementations/UserService.cs
index daf1b2078d..57b69deb71 100644
--- a/src/Core/Services/Implementations/UserService.cs
+++ b/src/Core/Services/Implementations/UserService.cs
@@ -904,7 +904,6 @@ public class UserService : UserManager<User>, IUserService
         }
         else
         {
-            user.MaxStorageGb = (short)(1 + additionalStorageGb);
             user.LicenseKey = CoreHelpers.SecureRandomString(20);
         }
 
@@ -977,7 +976,8 @@ public class UserService : UserManager<User>, IUserService
 
         var premiumPlan = await _pricingClient.GetAvailablePremiumPlan();
 
-        var secret = await BillingHelpers.AdjustStorageAsync(_paymentService, user, storageAdjustmentGb, premiumPlan.Storage.StripePriceId);
+        var baseStorageGb = (short)premiumPlan.Storage.Provided;
+        var secret = await BillingHelpers.AdjustStorageAsync(_paymentService, user, storageAdjustmentGb, premiumPlan.Storage.StripePriceId, baseStorageGb);
         await SaveUserAsync(user);
         return secret;
     }
diff --git a/src/Core/Utilities/BillingHelpers.cs b/src/Core/Utilities/BillingHelpers.cs
index e7ccfc3547..2c1dfcbbbd 100644
--- a/src/Core/Utilities/BillingHelpers.cs
+++ b/src/Core/Utilities/BillingHelpers.cs
@@ -7,7 +7,7 @@ namespace Bit.Core.Utilities;
 public static class BillingHelpers
 {
     internal static async Task<string> AdjustStorageAsync(IPaymentService paymentService, IStorableSubscriber storableSubscriber,
-        short storageAdjustmentGb, string storagePlanId)
+        short storageAdjustmentGb, string storagePlanId, short baseStorageGb)
     {
         if (storableSubscriber == null)
         {
@@ -30,9 +30,9 @@ public static class BillingHelpers
         }
 
         var newStorageGb = (short)(storableSubscriber.MaxStorageGb.Value + storageAdjustmentGb);
-        if (newStorageGb < 1)
+        if (newStorageGb < baseStorageGb)
         {
-            newStorageGb = 1;
+            newStorageGb = baseStorageGb;
         }
 
         if (newStorageGb > 100)
@@ -48,7 +48,7 @@ public static class BillingHelpers
                 "Delete some stored data first.");
         }
 
-        var additionalStorage = newStorageGb - 1;
+        var additionalStorage = newStorageGb - baseStorageGb;
         var paymentIntentClientSecret = await paymentService.AdjustStorageAsync(storableSubscriber,
             additionalStorage, storagePlanId);
         storableSubscriber.MaxStorageGb = newStorageGb;
diff --git a/test/Core.Test/Billing/Premium/Commands/CreatePremiumCloudHostedSubscriptionCommandTests.cs b/test/Core.Test/Billing/Premium/Commands/CreatePremiumCloudHostedSubscriptionCommandTests.cs
index 493246c578..cc9c409b4a 100644
--- a/test/Core.Test/Billing/Premium/Commands/CreatePremiumCloudHostedSubscriptionCommandTests.cs
+++ b/test/Core.Test/Billing/Premium/Commands/CreatePremiumCloudHostedSubscriptionCommandTests.cs
@@ -53,7 +53,7 @@ public class CreatePremiumCloudHostedSubscriptionCommandTests
             Available = true,
             LegacyYear = null,
             Seat = new PremiumPurchasable { Price = 10M, StripePriceId = StripeConstants.Prices.PremiumAnnually },
-            Storage = new PremiumPurchasable { Price = 4M, StripePriceId = StripeConstants.Prices.StoragePlanPersonal }
+            Storage = new PremiumPurchasable { Price = 4M, StripePriceId = StripeConstants.Prices.StoragePlanPersonal, Provided = 1 }
         };
         _pricingClient.GetAvailablePremiumPlan().Returns(premiumPlan);
 
@@ -720,4 +720,63 @@ public class CreatePremiumCloudHostedSubscriptionCommandTests
         await _stripeAdapter.DidNotReceive().SubscriptionCreateAsync(Arg.Any<SubscriptionCreateOptions>());
         await _userService.DidNotReceive().SaveUserAsync(Arg.Any<User>());
     }
+
+    [Theory, BitAutoData]
+    public async Task Run_WithAdditionalStorage_SetsCorrectMaxStorageGb(
+        User user,
+        TokenizedPaymentMethod paymentMethod,
+        BillingAddress billingAddress)
+    {
+        // Arrange
+        user.Premium = false;
+        user.GatewayCustomerId = null;
+        user.Email = "test@example.com";
+        paymentMethod.Type = TokenizablePaymentMethodType.Card;
+        paymentMethod.Token = "card_token_123";
+        billingAddress.Country = "US";
+        billingAddress.PostalCode = "12345";
+        const short additionalStorage = 2;
+
+        // Setup premium plan with 5GB provided storage
+        var premiumPlan = new PremiumPlan
+        {
+            Name = "Premium",
+            Available = true,
+            LegacyYear = null,
+            Seat = new PremiumPurchasable { Price = 10M, StripePriceId = StripeConstants.Prices.PremiumAnnually },
+            Storage = new PremiumPurchasable { Price = 4M, StripePriceId = StripeConstants.Prices.StoragePlanPersonal, Provided = 1 }
+        };
+        _pricingClient.GetAvailablePremiumPlan().Returns(premiumPlan);
+
+        var mockCustomer = Substitute.For<StripeCustomer>();
+        mockCustomer.Id = "cust_123";
+        mockCustomer.Address = new Address { Country = "US", PostalCode = "12345" };
+        mockCustomer.Metadata = new Dictionary<string, string>();
+
+        var mockSubscription = Substitute.For<StripeSubscription>();
+        mockSubscription.Id = "sub_123";
+        mockSubscription.Status = "active";
+        mockSubscription.Items = new StripeList<SubscriptionItem>
+        {
+            Data =
+            [
+                new SubscriptionItem
+                {
+                    CurrentPeriodEnd = DateTime.UtcNow.AddDays(30)
+                }
+            ]
+        };
+
+        _stripeAdapter.CustomerCreateAsync(Arg.Any<CustomerCreateOptions>()).Returns(mockCustomer);
+        _stripeAdapter.SubscriptionCreateAsync(Arg.Any<SubscriptionCreateOptions>()).Returns(mockSubscription);
+
+        // Act
+        var result = await _command.Run(user, paymentMethod, billingAddress, additionalStorage);
+
+        // Assert
+        Assert.True(result.IsT0);
+        Assert.Equal((short)3, user.MaxStorageGb); // 1 (provided) + 2 (additional) = 3
+        await _userService.Received(1).SaveUserAsync(user);
+    }
+
 }