diff --git a/pkg/services/object/put/streamer.go b/pkg/services/object/put/streamer.go
index ea885366b..f1ecd4df1 100644
--- a/pkg/services/object/put/streamer.go
+++ b/pkg/services/object/put/streamer.go
@@ -77,7 +77,7 @@ func (p *Streamer) initUntrustedTarget(prm *PutInitPrm) error {
 	p.relay = prm.relay
 
 	// prepare untrusted-Put object target
-	p.target = &validatingTarget{
+	p.target = &validatingPreparedTarget{
 		nextTarget: p.newCommonTarget(prm),
 		fmt:        p.fmtValidator,
 
@@ -125,8 +125,7 @@ func (p *Streamer) initTrustedTarget(prm *PutInitPrm) error {
 
 	p.sessionKey = sessionKey
 	p.target = &validatingTarget{
-		fmt:              p.fmtValidator,
-		unpreparedObject: true,
+		fmt: p.fmtValidator,
 		nextTarget: transformer.NewPayloadSizeLimiter(
 			p.maxPayloadSz,
 			containerSDK.IsHomomorphicHashingDisabled(prm.cnr),
diff --git a/pkg/services/object/put/validation.go b/pkg/services/object/put/validation.go
index 8c40d0677..a4790071a 100644
--- a/pkg/services/object/put/validation.go
+++ b/pkg/services/object/put/validation.go
@@ -15,13 +15,18 @@ import (
 	"git.frostfs.info/TrueCloudLab/tzhash/tz"
 )
 
-// validatingTarget validates object format and content.
+// validatingTarget validates unprepared object format and content (streaming PUT case).
 type validatingTarget struct {
 	nextTarget transformer.ObjectTarget
 
 	fmt *object.FormatValidator
+}
 
-	unpreparedObject bool
+// validatingPreparedTarget validates prepared object format and content.
+type validatingPreparedTarget struct {
+	nextTarget transformer.ObjectTarget
+
+	fmt *object.FormatValidator
 
 	hash hash.Hash
 
@@ -42,38 +47,52 @@ var (
 )
 
 func (t *validatingTarget) WriteHeader(ctx context.Context, obj *objectSDK.Object) error {
+	if err := t.fmt.Validate(ctx, obj, true); err != nil {
+		return fmt.Errorf("(%T) coult not validate object format: %w", t, err)
+	}
+
+	return t.nextTarget.WriteHeader(ctx, obj)
+}
+
+func (t *validatingTarget) Write(ctx context.Context, p []byte) (n int, err error) {
+	return t.nextTarget.Write(ctx, p)
+}
+
+func (t *validatingTarget) Close(ctx context.Context) (*transformer.AccessIdentifiers, error) {
+	return t.nextTarget.Close(ctx)
+}
+
+func (t *validatingPreparedTarget) WriteHeader(ctx context.Context, obj *objectSDK.Object) error {
 	t.payloadSz = obj.PayloadSize()
 	chunkLn := uint64(len(obj.Payload()))
 
-	if !t.unpreparedObject {
-		// check chunk size
-		if chunkLn > t.payloadSz {
-			return ErrWrongPayloadSize
-		}
-
-		// check payload size limit
-		if t.payloadSz > t.maxPayloadSz {
-			return ErrExceedingMaxSize
-		}
-
-		cs, csSet := obj.PayloadChecksum()
-		if !csSet {
-			return errors.New("missing payload checksum")
-		}
-
-		switch typ := cs.Type(); typ {
-		default:
-			return fmt.Errorf("(%T) unsupported payload checksum type %v", t, typ)
-		case checksum.SHA256:
-			t.hash = sha256.New()
-		case checksum.TZ:
-			t.hash = tz.New()
-		}
-
-		t.checksum = cs.Value()
+	// check chunk size
+	if chunkLn > t.payloadSz {
+		return ErrWrongPayloadSize
 	}
 
-	if err := t.fmt.Validate(ctx, obj, t.unpreparedObject); err != nil {
+	// check payload size limit
+	if t.payloadSz > t.maxPayloadSz {
+		return ErrExceedingMaxSize
+	}
+
+	cs, csSet := obj.PayloadChecksum()
+	if !csSet {
+		return errors.New("missing payload checksum")
+	}
+
+	switch typ := cs.Type(); typ {
+	default:
+		return fmt.Errorf("(%T) unsupported payload checksum type %v", t, typ)
+	case checksum.SHA256:
+		t.hash = sha256.New()
+	case checksum.TZ:
+		t.hash = tz.New()
+	}
+
+	t.checksum = cs.Value()
+
+	if err := t.fmt.Validate(ctx, obj, false); err != nil {
 		return fmt.Errorf("(%T) coult not validate object format: %w", t, err)
 	}
 
@@ -82,30 +101,26 @@ func (t *validatingTarget) WriteHeader(ctx context.Context, obj *objectSDK.Objec
 		return err
 	}
 
-	if !t.unpreparedObject {
-		// update written bytes
-		//
-		// Note: we MUST NOT add obj.PayloadSize() since obj
-		// can carry only the chunk of the full payload
-		t.writtenPayload += chunkLn
-	}
+	// update written bytes
+	//
+	// Note: we MUST NOT add obj.PayloadSize() since obj
+	// can carry only the chunk of the full payload
+	t.writtenPayload += chunkLn
 
 	return nil
 }
 
-func (t *validatingTarget) Write(ctx context.Context, p []byte) (n int, err error) {
+func (t *validatingPreparedTarget) Write(ctx context.Context, p []byte) (n int, err error) {
 	chunkLn := uint64(len(p))
 
-	if !t.unpreparedObject {
-		// check if new chunk will overflow payload size
-		if t.writtenPayload+chunkLn > t.payloadSz {
-			return 0, ErrWrongPayloadSize
-		}
+	// check if new chunk will overflow payload size
+	if t.writtenPayload+chunkLn > t.payloadSz {
+		return 0, ErrWrongPayloadSize
+	}
 
-		_, err = t.hash.Write(p)
-		if err != nil {
-			return
-		}
+	_, err = t.hash.Write(p)
+	if err != nil {
+		return
 	}
 
 	n, err = t.nextTarget.Write(ctx, p)
@@ -116,16 +131,14 @@ func (t *validatingTarget) Write(ctx context.Context, p []byte) (n int, err erro
 	return
 }
 
-func (t *validatingTarget) Close(ctx context.Context) (*transformer.AccessIdentifiers, error) {
-	if !t.unpreparedObject {
-		// check payload size correctness
-		if t.payloadSz != t.writtenPayload {
-			return nil, ErrWrongPayloadSize
-		}
+func (t *validatingPreparedTarget) Close(ctx context.Context) (*transformer.AccessIdentifiers, error) {
+	// check payload size correctness
+	if t.payloadSz != t.writtenPayload {
+		return nil, ErrWrongPayloadSize
+	}
 
-		if !bytes.Equal(t.hash.Sum(nil), t.checksum) {
-			return nil, fmt.Errorf("(%T) incorrect payload checksum", t)
-		}
+	if !bytes.Equal(t.hash.Sum(nil), t.checksum) {
+		return nil, fmt.Errorf("(%T) incorrect payload checksum", t)
 	}
 
 	return t.nextTarget.Close(ctx)