diff --git a/src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs b/src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs
index 8b55af7b7..2428f8cb0 100644
--- a/src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs
+++ b/src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs
@@ -106,4 +106,41 @@ public class HomePageProviderFlowTests
         Assert.NotNull(vm.SaveProfileCommand);
         Assert.True(vm.SaveProfileCommand.CanExecute(null));
     }
+
+    [Fact]
+    public void UserProfilePage_builds_profile_payload_for_calendar_and_bank_values()
+    {
+        var vm = new UserProfilePageViewModel
+        {
+            UserName = "alice.new",
+            FullName = "Alice Example",
+            Address = "14 rue de l’Érable",
+            DedicatedGoogleCalendar = "calendar-123",
+            BankInfoSummary = "FR14 2004 1010 0505 0001 3M02 606"
+        };
+
+        var payload = vm.BuildProfileUpdateRequest();
+
+        Assert.Equal("alice.new", payload.UserName);
+        Assert.Equal("calendar-123", payload.GoogleCalendarId);
+        Assert.Equal("FR14 2004 1010 0505 0001 3M02 606", payload.BankInfoSummary);
+    }
+
+    [Fact]
+    public void UserProfilePage_turns_placeholder_values_into_empty_payload_fields()
+    {
+        var vm = new UserProfilePageViewModel
+        {
+            UserName = "alice.new",
+            FullName = "Alice Example",
+            Address = "14 rue de l’Érable",
+            DedicatedGoogleCalendar = "Non configuré",
+            BankInfoSummary = "Aucune information bancaire"
+        };
+
+        var payload = vm.BuildProfileUpdateRequest();
+
+        Assert.Equal(string.Empty, payload.GoogleCalendarId);
+        Assert.Equal(string.Empty, payload.BankInfoSummary);
+    }
 }
diff --git a/src/PostIt/PostIt/ViewModels/Layout/UserProfilePageViewModel.cs b/src/PostIt/PostIt/ViewModels/Layout/UserProfilePageViewModel.cs
index 6f78d854e..f5e7df49d 100644
--- a/src/PostIt/PostIt/ViewModels/Layout/UserProfilePageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/Layout/UserProfilePageViewModel.cs
@@ -95,6 +95,31 @@ public partial class UserProfilePageViewModel : ViewModelBase
         }
     }
 
+    public ProfileUpdateRequest BuildProfileUpdateRequest()
+    {
+        static string NormalizeField(string? value, string placeholder)
+        {
+            if (string.IsNullOrWhiteSpace(value))
+            {
+                return string.Empty;
+            }
+
+            var trimmed = value.Trim();
+            return string.Equals(trimmed, placeholder, StringComparison.OrdinalIgnoreCase)
+                ? string.Empty
+                : trimmed;
+        }
+
+        return new ProfileUpdateRequest
+        {
+            UserName = NormalizeField(UserName, "—"),
+            FullName = NormalizeField(FullName, "—"),
+            Address = NormalizeField(Address, "—"),
+            GoogleCalendarId = NormalizeField(DedicatedGoogleCalendar, "Non configuré"),
+            BankInfoSummary = NormalizeField(BankInfoSummary, "Aucune information bancaire")
+        };
+    }
+
     [RelayCommand]
     public async Task SaveProfileAsync()
     {
@@ -107,14 +132,7 @@ public partial class UserProfilePageViewModel : ViewModelBase
         IsBusy = true;
         try
         {
-            var payload = new ProfileUpdateRequest
-            {
-                UserName = string.IsNullOrWhiteSpace(UserName) ? string.Empty : UserName.Trim(),
-                FullName = string.IsNullOrWhiteSpace(FullName) ? string.Empty : FullName.Trim(),
-                Address = string.IsNullOrWhiteSpace(Address) ? string.Empty : Address.Trim(),
-                GoogleCalendarId = DedicatedGoogleCalendar == "Non configuré" ? string.Empty : DedicatedGoogleCalendar.Trim(),
-                BankInfoSummary = BankInfoSummary == "Aucune information bancaire" ? string.Empty : BankInfoSummary.Trim()
-            };
+            var payload = BuildProfileUpdateRequest();
 
             var endpoint = new Uri(new Uri(_api.Settings.ApiUrl.TrimEnd('/') + "/", UriKind.Absolute), "account/me").ToString();
             await _api.CallAsync(HttpMethod.Put, endpoint, payload).ConfigureAwait(true);
diff --git a/src/Yavsc.Api/Controllers/accounting/AccountController.cs b/src/Yavsc.Api/Controllers/accounting/AccountController.cs
index 901441d67..a1713188a 100644
--- a/src/Yavsc.Api/Controllers/accounting/AccountController.cs
+++ b/src/Yavsc.Api/Controllers/accounting/AccountController.cs
@@ -116,44 +116,69 @@ namespace Yavsc.WebApi.Controllers
                 }
             }
 
-            if (!string.IsNullOrWhiteSpace(request.FullName))
+            if (request.FullName is not null)
             {
                 user.FullName = request.FullName.Trim();
             }
 
-            if (!string.IsNullOrWhiteSpace(request.Address))
+            if (request.Address is not null)
             {
-                if (user.PostalAddress is null)
+                var trimmedAddress = request.Address.Trim();
+                if (string.IsNullOrWhiteSpace(trimmedAddress))
                 {
-                    user.PostalAddress = new Yavsc.Models.Relationship.Location { Address = request.Address.Trim() };
+                    user.PostalAddress = null;
+                }
+                else if (user.PostalAddress is null)
+                {
+                    user.PostalAddress = new Yavsc.Models.Relationship.Location { Address = trimmedAddress };
                 }
                 else
                 {
-                    user.PostalAddress.Address = request.Address.Trim();
+                    user.PostalAddress.Address = trimmedAddress;
                 }
             }
 
-            if (!string.IsNullOrWhiteSpace(request.GoogleCalendarId))
+            if (request.GoogleCalendarId is not null)
             {
                 user.DedicatedGoogleCalendar = request.GoogleCalendarId.Trim();
             }
 
-            if (!string.IsNullOrWhiteSpace(request.BankInfoSummary) && (user.BankInfo is null || user.BankInfo.Count == 0))
+            if (request.BankInfoSummary is not null)
             {
-                var bank = new Yavsc.Models.Bank.BankIdentity
+                var bankSummary = request.BankInfoSummary.Trim();
+                if (string.IsNullOrWhiteSpace(bankSummary))
                 {
-                    UserId = uid,
-                    User = user,
-                    IBAN = request.BankInfoSummary,
-                    BIC = string.Empty,
-                    AccountNumber = string.Empty,
-                    BankCode = string.Empty,
-                    WicketCode = string.Empty,
-                    BankedKey = 0
-                };
+                    if (user.BankInfo is not null)
+                    {
+                        user.BankInfo.Clear();
+                    }
+                }
+                else if (user.BankInfo is null || user.BankInfo.Count == 0)
+                {
+                    var bank = new Yavsc.Models.Bank.BankIdentity
+                    {
+                        UserId = uid,
+                        User = user,
+                        IBAN = bankSummary,
+                        BIC = string.Empty,
+                        AccountNumber = string.Empty,
+                        BankCode = string.Empty,
+                        WicketCode = string.Empty,
+                        BankedKey = 0
+                    };
 
-                user.BankInfo ??= [];
-                user.BankInfo.Add(bank);
+                    user.BankInfo ??= [];
+                    user.BankInfo.Add(bank);
+                }
+                else
+                {
+                    var firstBank = user.BankInfo.First();
+                    firstBank.IBAN = bankSummary;
+                    firstBank.BIC = string.Empty;
+                    firstBank.AccountNumber = string.Empty;
+                    firstBank.BankCode = string.Empty;
+                    firstBank.WicketCode = string.Empty;
+                }
             }
 
             await _dbContext.SaveChangesAsync(uid);