According to convention, if the property is the primary key and it is an integer, make it the identity column. This wasn't being set by default

src/EFCore.Jet/Metadata/Internal/JetAnnotationProvider.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
 using JetBrains.Annotations;
@@ -32,7 +33,7 @@ namespace EntityFrameworkCore.Jet.Metadata.Internal
             : base(dependencies)
         {
         }
-        
+
         /// <summary>
         ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
         ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
@@ -86,6 +87,26 @@ namespace EntityFrameworkCore.Jet.Metadata.Internal
                     JetAnnotationNames.Identity,
                     string.Format(CultureInfo.InvariantCulture, "{0}, {1}", seed ?? 1, increment ?? 1));
             }
+            else
+            {
+                property = column.PropertyMappings.First().Property;
+                // Only return auto increment for integer single column primary key
+                var primaryKey = property.DeclaringEntityType.FindPrimaryKey();
+                if (primaryKey != null
+                    && primaryKey.Properties.Count == 1
+                    && primaryKey.Properties[0] == property
+                    && property.ValueGenerated == ValueGenerated.OnAdd
+                    && property.ClrType.UnwrapNullableType().IsInteger()
+                    && !HasConverter(property))
+                {
+                    yield return new Annotation(
+                        JetAnnotationNames.Identity,
+                        string.Format(CultureInfo.InvariantCulture, "{0}, {1}", 1, 1));
+                }
+            }
         }
+
+        private static bool HasConverter(IProperty property)
+            => (property.GetValueConverter() ?? property.FindTypeMapping()?.Converter) != null;
     }
 }