diff --git a/misago/posting/forms/inviteusers.py b/misago/posting/forms/inviteusers.py
index 23896660fd..4950761553 100644
--- a/misago/posting/forms/inviteusers.py
+++ b/misago/posting/forms/inviteusers.py
@@ -14,15 +14,14 @@
 else:
     User = get_user_model()
 
-PREFIX = "posting-invite-users"
-
 
 class InviteUsersForm(PostingForm):
+    form_prefix = "posting-invite-users"
+    template_name = "misago/posting/invite_users_form.html"
+
     request: HttpRequest
     invite_users: list["User"]
 
-    template_name = "misago/posting/invite_users_form.html"
-
     users = forms.CharField(max_length=200)
 
     def __init__(self, *args, **kwargs):
@@ -98,7 +97,7 @@ def create_invite_users_form(request: HttpRequest) -> InviteUsersForm:
         return InviteUsersForm(
             request.POST,
             request=request,
-            prefix=PREFIX,
+            prefix=InviteUsersForm.form_prefix,
         )
 
-    return InviteUsersForm(request=request, prefix=PREFIX)
+    return InviteUsersForm(request=request, prefix=InviteUsersForm.form_prefix)
diff --git a/misago/posting/forms/post.py b/misago/posting/forms/post.py
index 1e70193a3a..209f70aee1 100644
--- a/misago/posting/forms/post.py
+++ b/misago/posting/forms/post.py
@@ -16,16 +16,15 @@
 from .base import PostingForm
 from .attachments import MultipleFileField
 
-PREFIX = "posting-post"
-
 
 class PostForm(PostingForm):
+    form_prefix = "posting-post"
+    template_name = "misago/posting/post_form.html"
+    attachment_secret_name = "attachment_secret"
+
     request: HttpRequest
     attachments: list[Attachment]
     attachments_permissions: AttachmentsPermissions | None
-    attachment_secret_name = "attachment_secret"
-
-    template_name = "misago/posting/post_form.html"
 
     post = forms.CharField(
         widget=forms.Textarea,
@@ -164,7 +163,7 @@ def create_post_form(
         "request": request,
         "attachments": attachments,
         "attachments_permissions": attachments_permissions,
-        "prefix": PREFIX,
+        "prefix": PostForm.form_prefix,
     }
 
     if request.method == "POST":
diff --git a/misago/posting/forms/title.py b/misago/posting/forms/title.py
index f989f4344d..052bbbc8d9 100644
--- a/misago/posting/forms/title.py
+++ b/misago/posting/forms/title.py
@@ -6,14 +6,13 @@
 from ..validators import validate_thread_title
 from .base import PostingForm
 
-PREFIX = "posting-title"
-
 
 class TitleForm(PostingForm):
-    request: HttpRequest
-
+    form_prefix = "posting-title"
     template_name = "misago/posting/title_form.html"
 
+    request: HttpRequest
+
     title = forms.CharField(
         max_length=255,
         error_messages={
@@ -48,7 +47,7 @@ def create_title_form(request: HttpRequest, initial: str | None = None) -> Title
         return TitleForm(
             request.POST,
             request=request,
-            prefix=PREFIX,
+            prefix=TitleForm.form_prefix,
         )
 
     if initial:
@@ -56,4 +55,6 @@ def create_title_form(request: HttpRequest, initial: str | None = None) -> Title
     else:
         initial_data = None
 
-    return TitleForm(request=request, prefix=PREFIX, initial=initial_data)
+    return TitleForm(
+        request=request, prefix=TitleForm.form_prefix, initial=initial_data
+    )
diff --git a/misago/posting/formsets/formset.py b/misago/posting/formsets/formset.py
index 7282eacd18..2c273dbb12 100644
--- a/misago/posting/formsets/formset.py
+++ b/misago/posting/formsets/formset.py
@@ -1,6 +1,7 @@
 from django.core.exceptions import ValidationError
 
 from ...forms.formset import Formset
+from ..forms import InviteUsersForm, PostForm, TitleForm
 from ..state.base import PostingState
 
 
@@ -11,6 +12,18 @@ def __init__(self):
         super().__init__()
         self.errors = []
 
+    @property
+    def title(self) -> TitleForm | None:
+        return self.forms.get(TitleForm.form_prefix)
+
+    @property
+    def post(self) -> PostForm | None:
+        return self.forms.get(PostForm.form_prefix)
+
+    @property
+    def invite_users(self) -> InviteUsersForm | None:
+        return self.forms.get(InviteUsersForm.form_prefix)
+
     def update_state(self, state: PostingState):
         for form in self.forms.values():
             if form.is_valid():
diff --git a/misago/posting/tests/test_formsets.py b/misago/posting/tests/test_formsets.py
new file mode 100644
index 0000000000..25ba4fbf6d
--- /dev/null
+++ b/misago/posting/tests/test_formsets.py
@@ -0,0 +1,167 @@
+from unittest.mock import Mock
+
+from ...attachments.enums import AllowedAttachments
+from ...conf.test import override_dynamic_settings
+from ...permissions.enums import CanUploadAttachments
+from ...permissions.proxy import UserPermissionsProxy
+from ..formsets import (
+    get_edit_private_thread_formset,
+    get_edit_private_thread_post_formset,
+    get_edit_thread_formset,
+    get_edit_thread_post_formset,
+    get_reply_private_thread_formset,
+    get_reply_thread_formset,
+    get_start_private_thread_formset,
+    get_start_thread_formset,
+)
+
+
+def test_get_start_thread_formset_initializes_valid_forms(
+    user, cache_versions, dynamic_settings, default_category
+):
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_thread_formset(request, default_category)
+    assert formset.title
+    assert formset.post
+    assert not formset.invite_users
+
+
+def test_get_start_thread_formset_setups_post_form_with_attachment_uploads(
+    user, cache_versions, dynamic_settings, default_category
+):
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_thread_formset(request, default_category)
+    assert formset.post.show_attachments_upload
+
+
+def test_get_start_thread_formset_setups_post_form_with_attachment_upload_if_uploads_are_limited_to_threads(
+    user, members_group, cache_versions, dynamic_settings, default_category
+):
+    members_group.can_upload_attachments = CanUploadAttachments.THREADS
+    members_group.save()
+
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_thread_formset(request, default_category)
+    assert formset.post.show_attachments_upload
+
+
+def test_get_start_thread_formset_setups_post_form_without_attachment_upload_if_user_has_no_permission(
+    user, members_group, cache_versions, dynamic_settings, default_category
+):
+    members_group.can_upload_attachments = CanUploadAttachments.NEVER
+    members_group.save()
+
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_thread_formset(request, default_category)
+    assert not formset.post.show_attachments_upload
+
+
+@override_dynamic_settings(allowed_attachment_types=AllowedAttachments.NONE)
+def test_get_start_thread_formset_setups_post_form_without_attachment_upload_if_uploads_are_disabled(
+    user, cache_versions, dynamic_settings, default_category
+):
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_thread_formset(request, default_category)
+    assert not formset.post.show_attachments_upload
+
+
+def test_get_start_private_thread_formset_initializes_valid_forms(
+    user, cache_versions, dynamic_settings, private_threads_category
+):
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_private_thread_formset(request, private_threads_category)
+    assert formset.title
+    assert formset.post
+    assert formset.invite_users
+
+
+def test_get_start_private_thread_formset_setups_post_form_with_attachment_uploads(
+    user, cache_versions, dynamic_settings, private_threads_category
+):
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_private_thread_formset(request, private_threads_category)
+    assert formset.post.show_attachments_upload
+
+
+def test_get_start_private_thread_formset_setups_post_form_without_attachment_upload_if_user_no_has_private_threads_permission(
+    user, members_group, cache_versions, dynamic_settings, private_threads_category
+):
+    members_group.can_upload_attachments = CanUploadAttachments.THREADS
+    members_group.save()
+
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_private_thread_formset(request, private_threads_category)
+    assert not formset.post.show_attachments_upload
+
+
+def test_get_start_private_thread_formset_setups_post_form_without_attachment_upload_if_user_no_permission(
+    user, members_group, cache_versions, dynamic_settings, private_threads_category
+):
+    members_group.can_upload_attachments = CanUploadAttachments.NEVER
+    members_group.save()
+
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_private_thread_formset(request, private_threads_category)
+    assert not formset.post.show_attachments_upload
+
+
+@override_dynamic_settings(allowed_attachment_types=AllowedAttachments.NONE)
+def test_get_start_private_thread_formset_setups_post_form_without_attachment_upload_if_uploads_are_disabled(
+    user, cache_versions, dynamic_settings, private_threads_category
+):
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_private_thread_formset(request, private_threads_category)
+    assert not formset.post.show_attachments_upload
+
+
+@override_dynamic_settings(allow_private_threads_attachments=False)
+def test_get_start_private_thread_formset_setups_post_form_without_attachment_upload_if_private_threads_uploads_are_disabled(
+    user, cache_versions, dynamic_settings, private_threads_category
+):
+    request = Mock(
+        settings=dynamic_settings,
+        user=user,
+        user_permissions=UserPermissionsProxy(user, cache_versions),
+    )
+    formset = get_start_private_thread_formset(request, private_threads_category)
+    assert not formset.post.show_attachments_upload