diff --git a/src/Kontur.Extern.Api.Client.UnitTests/Client/Model/DocflowFiltering/DocflowFilterBuilder_Tests.cs b/src/Kontur.Extern.Api.Client.UnitTests/Client/Model/DocflowFiltering/DocflowFilterBuilder_Tests.cs
index 00eac370..5bbf8145 100644
--- a/src/Kontur.Extern.Api.Client.UnitTests/Client/Model/DocflowFiltering/DocflowFilterBuilder_Tests.cs
+++ b/src/Kontur.Extern.Api.Client.UnitTests/Client/Model/DocflowFiltering/DocflowFilterBuilder_Tests.cs
@@ -41,6 +41,7 @@ public void Should_build_filter_with_non_dependent_fields()
                 .WithOkud(Okud.Parse("1234567"))
                 .WithRegNumberOfPfrDocflow(PfrRegNumber.Parse("123-456-789012"))
                 .WithTypes(DocflowType.Fns534Report, DocflowType.Fns534Letter)
+                .WithSuccessStates(DocflowState.Successful, DocflowState.Warning)
                 .WithFormName("the form")
                 .WithCreatedFrom(createdFrom)
                 .WithCreatedTo(createdTo)
@@ -69,7 +70,9 @@ public void Should_build_filter_with_non_dependent_fields()
                 ("periodFrom", "2021-07-08T00:00:00.0000000"),
                 ("periodTo", "2021-07-18T00:00:00.0000000"),
                 ("type", "fns534-report"),
-                ("type", "fns534-letter")
+                ("type", "fns534-letter"),
+                ("successState", "successful"),
+                ("successState", "warning")
             );
         }
 
@@ -144,6 +147,31 @@ public void Should_create_correct_filter_with_existing_docflow_type(DocflowType
             ShouldHaveExpectedQueryParameters(filter, ("type", type.ToUrn()!.Nss));
         }
 
+        [Test]
+        public void Should_create_correct_filter_with_success_states()
+        {
+            var filter = new DocflowFilterBuilder()
+                .WithSuccessStates(DocflowState.Successful, DocflowState.Warning)
+                .CreateFilter();
+            
+            ShouldHaveExpectedQueryParameters(
+                filter,
+                ("successState", "successful"),
+                ("successState", "warning"));
+        }
+
+        [Test]
+        public void Should_create_correct_filter_with_non_existing_state_in_sdk()
+        {
+            var filter = new DocflowFilterBuilder()
+                .WithSuccessStates(new DocflowState("urn:docflow-state:unknown-state"))
+                .CreateFilter();
+            
+            ShouldHaveExpectedQueryParameters(
+                filter,
+                ("successState", "unknown-state")); 
+        }
+        
         private static readonly DocflowType[] TypeCases =
         {
             DocflowType.PfrAncillary,
diff --git a/src/Kontur.Extern.Api.Client/ApiLevel/Models/Requests/Docflows/DocflowFilter.cs b/src/Kontur.Extern.Api.Client/ApiLevel/Models/Requests/Docflows/DocflowFilter.cs
index 8a19204c..9570a04e 100644
--- a/src/Kontur.Extern.Api.Client/ApiLevel/Models/Requests/Docflows/DocflowFilter.cs
+++ b/src/Kontur.Extern.Api.Client/ApiLevel/Models/Requests/Docflows/DocflowFilter.cs
@@ -2,8 +2,8 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using JetBrains.Annotations;
-using Kontur.Extern.Api.Client.Models.Common;
 using Kontur.Extern.Api.Client.Common.Time;
+using Kontur.Extern.Api.Client.Models.Common;
 using Kontur.Extern.Api.Client.Models.Common.Enums;
 using Kontur.Extern.Api.Client.Models.Docflows.Enums;
 
@@ -78,6 +78,12 @@ public class DocflowFilter
         /// </summary>
         public void SetTypes(DocflowType[] value) => queryParameters.Set(value);
 
+        /// <summary>
+        /// Состояния документооборотов
+        /// </summary>
+        /// <param name="value"></param>
+        public void SetSuccessStates(DocflowState[] value) => queryParameters.Set(value);
+        
         /// <summary>
         /// КНД – код налоговой декларации. Задается по маске XXXXXXX, где Х - это цифра от 0 до 9
         /// </summary>
@@ -154,6 +160,7 @@ private class QueryParameters
             public const string createdFrom = nameof(createdFrom);
             public const string createdTo = nameof(createdTo);
             public const string type = nameof(type);
+            public const string successState = nameof(successState);
             public const string knd = nameof(knd);
             public const string okud = nameof(okud);
             public const string okpo = nameof(okpo);
@@ -171,7 +178,8 @@ private class QueryParameters
             private readonly Dictionary<string, string> queryParameters = new();
             private readonly List<string> types = new(0);
             private readonly List<string> pfrLetterTypes = new(0);
-
+            private readonly List<string> successStates = new(0);
+            
             public IEnumerable<(string name, string value)> GetParameters()
             {
                 foreach (var pair in queryParameters)
@@ -188,6 +196,11 @@ private class QueryParameters
                 {
                     yield return (pfrLetterCategory, category);
                 }
+
+                foreach (var state in successStates)
+                {
+                    yield return (successState, state);
+                }
             }
             
             public void Set(string parameterName, bool? value) => 
@@ -245,6 +258,23 @@ public void Set(PfrLetterType[]? letterTypes)
                 }
             }
 
+            public void Set(DocflowState[]? states)
+            {
+                if (states is null)
+                {
+                    successStates.Clear();
+                }
+                else
+                {
+                    foreach (var state in states)
+                    {
+                        var urn = state.ToUrn();
+                        if (!successStates.Contains(urn.Nss))
+                            successStates.Add(urn.Nss);
+                    }
+                }
+            }
+            
             public void Set(string parameterName, string? value) => 
                 SetValue(parameterName, value);
 
diff --git a/src/Kontur.Extern.Api.Client/Client/Model/DocflowFiltering/DocflowFilterBuilder.cs b/src/Kontur.Extern.Api.Client/Client/Model/DocflowFiltering/DocflowFilterBuilder.cs
index c675816e..70fae8e4 100644
--- a/src/Kontur.Extern.Api.Client/Client/Model/DocflowFiltering/DocflowFilterBuilder.cs
+++ b/src/Kontur.Extern.Api.Client/Client/Model/DocflowFiltering/DocflowFilterBuilder.cs
@@ -2,11 +2,11 @@
 using System.Diagnostics.CodeAnalysis;
 using JetBrains.Annotations;
 using Kontur.Extern.Api.Client.ApiLevel.Models.Requests.Docflows;
+using Kontur.Extern.Api.Client.Common.Time;
 using Kontur.Extern.Api.Client.Exceptions;
+using Kontur.Extern.Api.Client.Models.Common.Enums;
 using Kontur.Extern.Api.Client.Models.Docflows.Enums;
 using Kontur.Extern.Api.Client.Models.Numbers;
-using Kontur.Extern.Api.Client.Common.Time;
-using Kontur.Extern.Api.Client.Models.Common.Enums;
 
 namespace Kontur.Extern.Api.Client.Model.DocflowFiltering
 {
@@ -138,6 +138,12 @@ public DocflowFilterBuilder WithTypes(params DocflowType[] types)
             return this;
         }
 
+        public DocflowFilterBuilder WithSuccessStates(params DocflowState[] states)
+        {
+            filter.SetSuccessStates(states);
+            return this;
+        }
+
         /// <summary>
         /// КНД – код налоговой декларации.
         /// </summary>