diff --git a/modules/core/src/main/scala/sangria/execution/FutureResolver.scala b/modules/core/src/main/scala/sangria/execution/FutureResolver.scala
index d1640459..9e49a619 100644
--- a/modules/core/src/main/scala/sangria/execution/FutureResolver.scala
+++ b/modules/core/src/main/scala/sangria/execution/FutureResolver.scala
@@ -1405,7 +1405,11 @@ private[execution] class FutureResolver[Ctx](
             if (isUndefinedValue(value))
               None
             else {
-              val coerced = scalar.coerceOutput(value, marshaller.capabilities)
+              val corcedInput = scalar
+                .coerceUserInput(value)
+                // Do we need a specific exepction here?
+                .fold(e => throw new ValidationError(Vector(e), exceptionHandler), identity)
+              val coerced = scalar.coerceOutput(corcedInput, marshaller.capabilities)
 
               if (isUndefinedValue(coerced)) {
                 None
diff --git a/modules/core/src/main/scala/sangria/schema/ResolverBasedAstSchemaBuilder.scala b/modules/core/src/main/scala/sangria/schema/ResolverBasedAstSchemaBuilder.scala
index d738f362..fb3fdeeb 100644
--- a/modules/core/src/main/scala/sangria/schema/ResolverBasedAstSchemaBuilder.scala
+++ b/modules/core/src/main/scala/sangria/schema/ResolverBasedAstSchemaBuilder.scala
@@ -587,7 +587,7 @@ object ResolverBasedAstSchemaBuilder {
           case v: String => safe(v.toDouble, "Float", value)
           case _ => invalidType("Float", value)
         }
-      case _ => coerced
+      case _ => t.coerceUserInput(coerced).fold(e => invalidType(t.name, value), identity)
     }
   }
 
diff --git a/modules/core/src/test/scala/sangria/marshalling/IonSupportSpec.scala b/modules/core/src/test/scala/sangria/marshalling/IonSupportSpec.scala
index ee0154fc..3b3df168 100644
--- a/modules/core/src/test/scala/sangria/marshalling/IonSupportSpec.scala
+++ b/modules/core/src/test/scala/sangria/marshalling/IonSupportSpec.scala
@@ -40,6 +40,7 @@ class IonSupportSpec extends AnyWordSpec with Matchers with FutureResultSupport
       else dateFormat.format(d),
     coerceUserInput = {
       case s: String => parseDate(s)
+      case d: Date => Right(d)
       case _ => Left(DateCoercionViolation)
     },
     coerceInput = {
@@ -51,13 +52,20 @@ class IonSupportSpec extends AnyWordSpec with Matchers with FutureResultSupport
   val BlobType = ScalarType[Array[Byte]](
     "Blob",
     coerceOutput = (d, _) => d,
-    coerceUserInput = _ => Left(BinaryCoercionViolation),
-    coerceInput = _ => Left(BinaryCoercionViolation))
+    coerceUserInput = {
+      case bs: Array[Byte] => Right(bs)
+      case _ => Left(BinaryCoercionViolation)
+    },
+    coerceInput = _ => Left(BinaryCoercionViolation)
+  )
 
   val ClobType = ScalarType[Array[Byte]](
     "Clob",
     coerceOutput = (d, _) => d,
-    coerceUserInput = _ => Left(BinaryCoercionViolation),
+    coerceUserInput = {
+      case bs: Array[Byte] => Right(bs)
+      case _ => Left(BinaryCoercionViolation)
+    },
     coerceInput = _ => Left(BinaryCoercionViolation),
     scalarInfo = Set(IonClobScalar)
   )
diff --git a/modules/core/src/test/scala/sangria/schema/CustomScalarSpec.scala b/modules/core/src/test/scala/sangria/schema/CustomScalarSpec.scala
index 6ba2c9a5..1ba8e6ff 100644
--- a/modules/core/src/test/scala/sangria/schema/CustomScalarSpec.scala
+++ b/modules/core/src/test/scala/sangria/schema/CustomScalarSpec.scala
@@ -30,6 +30,7 @@ class CustomScalarSpec extends AnyWordSpec with Matchers {
         coerceOutput = (d, _) => dateFormat.format(d),
         coerceUserInput = {
           case s: String => parseDate(s)
+          case d: Date => Right(d)
           case _ => Left(DateCoercionViolation)
         },
         coerceInput = {
diff --git a/modules/core/src/test/scala/sangria/schema/ResolverBasedAstSchemaBuilderSpec.scala b/modules/core/src/test/scala/sangria/schema/ResolverBasedAstSchemaBuilderSpec.scala
index cbf6e785..55127386 100644
--- a/modules/core/src/test/scala/sangria/schema/ResolverBasedAstSchemaBuilderSpec.scala
+++ b/modules/core/src/test/scala/sangria/schema/ResolverBasedAstSchemaBuilderSpec.scala
@@ -34,6 +34,7 @@ class ResolverBasedAstSchemaBuilderSpec extends AnyWordSpec with Matchers with F
       "UUID",
       coerceOutput = (v, _) => v.toString,
       coerceUserInput = {
+        case uuid: UUID => Right(uuid)
         case s: String => parseUuid(s)
         case _ => Left(UUIDViolation)
       },