diff --git a/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn.Test/ItemsPlanningTagsServiceOrderTests.cs b/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn.Test/ItemsPlanningTagsServiceOrderTests.cs
new file mode 100644
index 00000000..3dce9c0f
--- /dev/null
+++ b/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn.Test/ItemsPlanningTagsServiceOrderTests.cs
@@ -0,0 +1,96 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2007 - 2026 Microting A/S
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+namespace ItemsPlanning.Pn.Test;
+
+using System.Linq;
+using System.Threading.Tasks;
+using ItemsPlanning.Pn.Services.ItemsPlanningLocalizationService;
+using ItemsPlanning.Pn.Services.ItemsPlanningTagsService;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging.Abstractions;
+using Microting.eFormApi.BasePn.Abstractions;
+using Microting.ItemsPlanningBase.Infrastructure.Data;
+using Microting.ItemsPlanningBase.Infrastructure.Data.Entities;
+using NSubstitute;
+using NUnit.Framework;
+using Testcontainers.MariaDb;
+
+/// <summary>
+/// GetItemsPlanningTags must list tags in Danish order (#2126). Runs against a real
+/// MariaDB so the test also fails if the sort ever moves back into SQL, where the
+/// column collation (utf8mb4_general_ci) folds Å to A.
+/// </summary>
+[TestFixture]
+public class ItemsPlanningTagsServiceOrderTests
+{
+    private readonly MariaDbContainer _mariaDbContainer = new MariaDbBuilder("mariadb:11.2")
+        .WithDatabase("items-planning-tags-order")
+        .WithPassword("secretpassword")
+        .Build();
+
+    private ItemsPlanningPnDbContext _dbContext;
+
+    [OneTimeSetUp]
+    public async Task OneTimeSetUp()
+    {
+        await _mariaDbContainer.StartAsync();
+
+        var connectionString = _mariaDbContainer.GetConnectionString();
+        var options = new DbContextOptionsBuilder<ItemsPlanningPnDbContext>()
+            .UseMySql(connectionString, ServerVersion.AutoDetect(connectionString))
+            .Options;
+
+        _dbContext = new ItemsPlanningPnDbContext(options);
+        await _dbContext.Database.EnsureCreatedAsync();
+    }
+
+    [OneTimeTearDown]
+    public async Task OneTimeTearDown()
+    {
+        await _dbContext.DisposeAsync();
+        await _mariaDbContainer.DisposeAsync();
+    }
+
+    [Test]
+    public async Task GetItemsPlanningTags_ReturnsTagsInDanishOrder()
+    {
+        foreach (var name in new[] { "Øko", "Beta", "Åben", "Alfa", "Æble" })
+        {
+            await new PlanningTag { Name = name }.Create(_dbContext);
+        }
+
+        var service = new ItemsPlanningTagsService(
+            Substitute.For<IItemsPlanningLocalizationService>(),
+            NullLogger<ItemsPlanningTagsService>.Instance,
+            _dbContext,
+            Substitute.For<IUserService>());
+
+        var result = await service.GetItemsPlanningTags();
+
+        Assert.That(result.Success, Is.True);
+        Assert.That(result.Model.Select(x => x.Name),
+            Is.EqualTo(new[] { "Alfa", "Beta", "Æble", "Øko", "Åben" }));
+    }
+}
diff --git a/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn/Helpers/TagNameComparer.cs b/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn/Helpers/TagNameComparer.cs
new file mode 100644
index 00000000..2aaa1758
--- /dev/null
+++ b/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn/Helpers/TagNameComparer.cs
@@ -0,0 +1,41 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2007 - 2026 Microting A/S
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+namespace ItemsPlanning.Pn.Helpers;
+
+using System;
+using System.Globalization;
+
+/// <summary>
+/// The one order for planning tag names (#2126). Always Danish (a…z, æ, ø, å),
+/// case-insensitive, regardless of the user's UI language, so every tag picker
+/// shows the same order. The database collation (utf8mb4_general_ci) folds Å to A,
+/// so tags are sorted in memory with this comparer instead of in SQL.
+/// Needs ICU at runtime (InvariantGlobalization must stay off in the host).
+/// </summary>
+public static class TagNameComparer
+{
+    public static readonly StringComparer Danish =
+        StringComparer.Create(CultureInfo.GetCultureInfo("da-DK"), ignoreCase: true);
+}
diff --git a/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn/Services/ItemsPlanningTagsService/ItemsPlanningTagsService.cs b/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn/Services/ItemsPlanningTagsService/ItemsPlanningTagsService.cs
index 7ce5fc26..ea4f6d18 100644
--- a/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn/Services/ItemsPlanningTagsService/ItemsPlanningTagsService.cs
+++ b/eFormAPI/Plugins/ItemsPlanning.Pn/ItemsPlanning.Pn/Services/ItemsPlanningTagsService/ItemsPlanningTagsService.cs
@@ -38,6 +38,7 @@ namespace ItemsPlanning.Pn.Services.ItemsPlanningTagsService;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Helpers;
 using Infrastructure.Models.Planning;
 using Microting.eForm.Infrastructure.Constants;
 
@@ -60,11 +61,12 @@ public async Task<OperationDataResult<List<PlanningTagModel>>> GetItemsPlanningT
                     Id = x.Id,
                     Name = x.Name,
                     IsLocked = x.IsLocked
-                }).OrderBy(x => x.Name).ToListAsync();
+                }).ToListAsync();
 
+            // Sorted in memory: the column collation folds Å to A (#2126).
             return new OperationDataResult<List<PlanningTagModel>>(
                 true,
-                itemsPlanningTags);
+                itemsPlanningTags.OrderBy(x => x.Name, TagNameComparer.Danish).ToList());
         }
         catch (Exception e)
         {