diff --git a/src/FiscalOS.API/Accounts/Add/Endpoint.cs b/src/FiscalOS.API/Accounts/Add/Endpoint.cs
index 2b70e6f..06f3e4e 100644
--- a/src/FiscalOS.API/Accounts/Add/Endpoint.cs
+++ b/src/FiscalOS.API/Accounts/Add/Endpoint.cs
@@ -42,12 +42,9 @@ internal static class Endpoint
       return Results.Conflict();
     }
 
-    // TODO: We need to get the initial balance
-    // of the account
-
     var accountMetadata = PlaidAccountMetadata.From(request.PlaidAccountId, request.PlaidAccountName);
     var account = Account.From(user.Institutions.First().Id, request.PlaidAccountName, accountMetadata);
-    var balance = Balance.From(request.AccountCurrentBalance, request.AccountAvailableBalance);
+    var balance = Balance.From(request.AccountCurrentBalance, request.AccountAvailableBalance, request.AccountCurrencyCode);
 
     account.AddBalance(balance);
     user.AddAccount(account);
diff --git a/src/FiscalOS.API/Accounts/Add/Request.cs b/src/FiscalOS.API/Accounts/Add/Request.cs
index 470e5b4..fdc4923 100644
--- a/src/FiscalOS.API/Accounts/Add/Request.cs
+++ b/src/FiscalOS.API/Accounts/Add/Request.cs
@@ -7,6 +7,7 @@ public record Request : IValidatableObject
   public string PlaidAccountName { get; init; } = string.Empty;
   public decimal AccountCurrentBalance { get; init; }
   public decimal AccountAvailableBalance { get; init; }
+  public string AccountCurrencyCode { get; init; } = string.Empty;
 
   public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
   {
@@ -27,5 +28,11 @@ public record Request : IValidatableObject
       var fieldName = nameof(PlaidAccountName);
       yield return new($"The {fieldName} field is required.", [fieldName]);
     }
+
+    if (string.IsNullOrWhiteSpace(AccountCurrencyCode))
+    {
+      var fieldName = nameof(AccountCurrencyCode);
+      yield return new($"The {fieldName} field is required.", [fieldName]);
+    }
   }
 }
\ No newline at end of file
diff --git a/tests/FiscalOS.API.Tests/Integration/Accounts/AddTests.cs b/tests/FiscalOS.API.Tests/Integration/Accounts/AddTests.cs
index e0f0e9d..96a89f4 100644
--- a/tests/FiscalOS.API.Tests/Integration/Accounts/AddTests.cs
+++ b/tests/FiscalOS.API.Tests/Integration/Accounts/AddTests.cs
@@ -16,7 +16,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
   }
 
   [Fact]
-  public async Task Add_WhenCalledWithoutInstitutionIdOrAccountIdOrAccountName_ItShouldReturn400WithProblemDetails()
+  public async Task Add_WhenCalledWithoutRequiredInformation_ItShouldReturn400WithProblemDetails()
   {
     using var request = HttpRequestBuilder.New()
       .Post(AddUri)
@@ -31,6 +31,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
       ["PlaidInstitutionId"] = ["The PlaidInstitutionId field is required."],
       ["PlaidAccountId"] = ["The PlaidAccountId field is required."],
       ["PlaidAccountName"] = ["The PlaidAccountName field is required."],
+      ["AccountCurrencyCode"] = ["The AccountCurrencyCode field is required."],
     });
   }
 
@@ -44,6 +45,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
       {
         plaidAccountId = "accountId",
         plaidAccountName = "Some Account",
+        accountCurrencyCode = "USD",
       })
       .Build();
 
@@ -65,6 +67,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
       {
         plaidInstitutionId = "institutionId",
         plaidAccountName = "Some Account",
+        accountCurrencyCode = "USD",
       })
       .Build();
 
@@ -86,6 +89,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
       {
         plaidInstitutionId = "institutionId",
         plaidAccountId = "accountId",
+        accountCurrencyCode = "USD",
       })
       .Build();
 
@@ -108,6 +112,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
         plaidInstitutionId = "id",
         plaidAccountId = "id",
         plaidAccountName = "Some Account",
+        accountCurrencyCode = "USD",
       })
       .Build();
 
@@ -141,6 +146,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
         plaidInstitutionId = "id",
         plaidAccountId = "id",
         plaidAccountName = "Some Account",
+        accountCurrencyCode = "USD",
       })
       .Build();
 
@@ -189,6 +195,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
         plaidInstitutionId = ((PlaidMetadata)institution.Metadata!).PlaidId,
         plaidAccountId = ((PlaidAccountMetadata)account.Metadata!).PlaidId,
         plaidAccountName = ((PlaidAccountMetadata)account.Metadata).PlaidName,
+        accountCurrencyCode = "USD",
       })
       .Build();
 
@@ -223,6 +230,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
     var newAccountId = "newAccountId";
     var newAccountName = "New Account";
     var expectedBalance = 100;
+    var expectedCurrencyCode = "USD";
 
     using var request = HttpRequestBuilder.New()
       .Post(AddUri)
@@ -234,6 +242,7 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
         plaidAccountName = newAccountName,
         accountCurrentBalance = expectedBalance,
         accountAvailableBalance = expectedBalance,
+        accountCurrencyCode = expectedCurrencyCode,
       })
       .Build();
 
@@ -264,7 +273,8 @@ public class AddTests(TestApi testApi) : IntegrationTest(testApi)
       .Balances.Should().ContainSingle(
         b => b.AccountId == updatedUser.Accounts.First().Id &&
           b.Current == expectedBalance &&
-          b.Available == expectedBalance
+          b.Available == expectedBalance &&
+          b.CurrencyCode == expectedCurrencyCode
       );
   }
 }
\ No newline at end of file
diff --git a/tests/FiscalOS.API.Tests/Integration/Institutions/GetAvailableTests.cs b/tests/FiscalOS.API.Tests/Integration/Institutions/GetAvailableTests.cs
index 228626e..1335931 100644
--- a/tests/FiscalOS.API.Tests/Integration/Institutions/GetAvailableTests.cs
+++ b/tests/FiscalOS.API.Tests/Integration/Institutions/GetAvailableTests.cs
@@ -10,6 +10,7 @@ public class GetAvailableTests(TestApi testApi) : IntegrationTest(testApi)
   {
     return new($"/institutions/{id}/available", UriKind.Relative);
   }
+
   [Fact]
   public async Task GetAvailable_WhenCalledAndUnauthenticated_ItShouldReturn401WithProblemDetails()
   {