diff --git a/src/Nyanlabs.Umogen.Core/Models/IEntity.cs b/src/Nyanlabs.Umogen.Core/Models/IEntity.cs
new file mode 100644
index 0000000..0c11c94
--- /dev/null
+++ b/src/Nyanlabs.Umogen.Core/Models/IEntity.cs
@@ -0,0 +1,7 @@
+namespace Nyanlabs.Umogen.Core.Models;
+
+public interface IEntity : INLSerializable
+{
+    public string GetName();
+    public string? IdCode();
+}
diff --git a/src/Nyanlabs.Umogen.Core/Models/LegalEntity.cs b/src/Nyanlabs.Umogen.Core/Models/LegalEntity.cs
new file mode 100644
index 0000000..027c4ea
--- /dev/null
+++ b/src/Nyanlabs.Umogen.Core/Models/LegalEntity.cs
@@ -0,0 +1,24 @@
+namespace Nyanlabs.Umogen.Core.Models;
+
+public class LegalEntity(string Name, string? Nip = null, string? Headquarters = null, Person? Representative = null) : IEntity, INLSerializable
+{
+    public string Name { get; set; } = Name;
+    public string? Nip { get; set; } = Nip;
+    public string? Headquarters { get; set; } = Headquarters;
+    public Person? Representative { get; set; } = Representative;
+
+    public string GetName()
+    {
+        return Name;
+    }
+
+    public string? IdCode()
+    {
+        return Nip;
+    }
+
+    public string NLSerialize()
+    {
+        return $"{Name}; with NIP {Nip ?? "unknown"}{(Headquarters != null ? $"; located in {Headquarters}" : "")}{(Representative != null ? $"; represented by {Representative.GetName()}" : "")}";
+    }
+}
diff --git a/src/Nyanlabs.Umogen.Core/Models/Person.cs b/src/Nyanlabs.Umogen.Core/Models/Person.cs
index 1befbe4..343d09d 100644
--- a/src/Nyanlabs.Umogen.Core/Models/Person.cs
+++ b/src/Nyanlabs.Umogen.Core/Models/Person.cs
@@ -1,6 +1,6 @@
 namespace Nyanlabs.Umogen.Core.Models;
 
-public record Person(string Name, string Surname, string? Id = null, string? Pesel = null, DateTime? DoB = null) : INLSerializable
+public record Person(string Name, string Surname, string? Id = null, string? Pesel = null, DateTime? DoB = null) : IEntity, INLSerializable
 {
     public string Name { get; set; } = Name;
     public string Surname { get; set; } = Surname;
@@ -8,6 +8,16 @@ public record Person(string Name, string Surname, string? Id = null, string? Pes
     public string? Pesel { get; set; } = Pesel;
     public DateTime? DoB { get; set; } = DoB;
 
+    public string GetName()
+    {
+        return $"{Name} {Surname}";
+    }
+
+    public string? IdCode()
+    {
+        return IDCode!;
+    }
+
     public string NLSerialize()
     {
         return $"{Name} {Surname}; {(Pesel != null ? $"PESEL {Pesel}" : "unknown PESEL")}; {(IDCode != null ? $"ID series {IDCode}" : "unknown ID series")}; {(DoB != null ? $"born {DoB.Value:dd MMM yyyy}" : "unknown date of birth")}";
diff --git a/src/Nyanlabs.Umogen.Core/Models/UmoDocument.cs b/src/Nyanlabs.Umogen.Core/Models/UmoDocument.cs
index 291b648..0ad4733 100644
--- a/src/Nyanlabs.Umogen.Core/Models/UmoDocument.cs
+++ b/src/Nyanlabs.Umogen.Core/Models/UmoDocument.cs
@@ -30,7 +30,7 @@ public static class UmoDoctypeBindings
 
 public class UmoDocument : INLSerializable
 {
-    public UmoDocument(UmoDoctype type, Person employer, Person employee, ValidTime? validTime = null)
+    public UmoDocument(UmoDoctype type, IEntity employer, Person employee, ValidTime? validTime = null)
     {
         Doctype = type;
         Employer = employer;
@@ -39,7 +39,7 @@ public class UmoDocument : INLSerializable
     }
 
     public UmoDoctype Doctype { get; set; }
-    public Person Employer { get; set; }
+    public IEntity Employer { get; set; }
     public Person Employee { get; set; }
     //Null is 'unspecified time'
     public ValidTime? ValidTime { get; set; }
diff --git a/test/Nyanlabs.Umogen.CoreTests/NLSerializationTests.cs b/test/Nyanlabs.Umogen.CoreTests/NLSerializationTests.cs
index 2e60fd8..46d23f8 100644
--- a/test/Nyanlabs.Umogen.CoreTests/NLSerializationTests.cs
+++ b/test/Nyanlabs.Umogen.CoreTests/NLSerializationTests.cs
@@ -18,7 +18,7 @@ public class NLSerializationTests
         var query = doc.NLSerialize();
 
         // Then
-        Assert.Equal($"Contract of Employment for {ModelEmployee.NLSerialize()} working for {ModelEmployer.NLSerialize()}; valid for unspecified time.", query);
+        Assert.Equal($"Umowa o Pracę for {ModelEmployee.NLSerialize()} working for {ModelEmployer.NLSerialize()}; valid for unspecified time.", query);
     }
 
     [Fact]
@@ -31,7 +31,7 @@ public class NLSerializationTests
         var query = doc.NLSerialize();
 
         // Then
-        Assert.Equal($"Contract of Employment for {ModelEmployee.NLSerialize()} working for {ModelEmployer.NLSerialize()}; valid from 17 Nov 2023 until 18 Nov 2023.", query);
+        Assert.Equal($"Umowa o Pracę for {ModelEmployee.NLSerialize()} working for {ModelEmployer.NLSerialize()}; valid from 17 Nov 2023 until 18 Nov 2023.", query);
     }
 
     [Fact]
@@ -64,4 +64,19 @@ public class NLSerializationTests
         // Then
         Assert.Equal("Kotek Miauczyński; unknown PESEL; unknown ID series; unknown date of birth", query);
     }
+
+    private LegalEntity ModelCompany => new("Nyanbyte P.S.A.", "1313131313", "Miaumiaśna 13, Miauczki", ModelEmployer);
+
+    [Fact]
+    public void CompanySerializationTest()
+    {
+        // Given
+        LegalEntity company = ModelCompany;
+
+        // When
+        var query = company.NLSerialize();
+
+        // Then
+        Assert.Equal("Nyanbyte P.S.A.; with NIP 1313131313; located in Miaumiaśna 13, Miauczki; represented by Kotek Miauczyński", query);
+    }
 }