diff --git a/packages/core/src/schema.ts b/packages/core/src/schema.ts
index eb0ae4b07dc..c58a4b381bd 100644
--- a/packages/core/src/schema.ts
+++ b/packages/core/src/schema.ts
@@ -1,4 +1,3 @@
-import { Schema } from "effect"
 import {
   AbsolutePath,
   DateTimeUtcFromMillis,
@@ -38,52 +37,3 @@ export type DeepMutable<T> = T extends string | number | boolean | bigint | symb
       : T extends object
         ? { -readonly [K in keyof T]: DeepMutable<T[K]> }
         : T
-
-/**
- * Nominal wrapper for scalar types. The class itself is a valid schema —
- * pass it directly to `Schema.decodeUnknownSync`, `Schema.decodeEffect`, etc.
- *
- * The runtime value remains an unwrapped primitive. `Schema.brand` supplies
- * the primitive schema behavior and constructor validation, while the class
- * supplies the nominal TypeScript identity.
- * Apply checks and annotations to the underlying schema before wrapping it;
- * schema rebuild operations intentionally return the underlying schema shape.
- *
- * @example
- *   class QuestionID extends Newtype<QuestionID>()("QuestionID", Schema.String) {}
- *
- *   const id = QuestionID.make("question-1")
- *   Schema.decodeUnknownEffect(QuestionID)(input)
- */
-type NewtypeSchema<Self, Tag extends string, S extends Schema.Top> = (abstract new (_: never) => {
-  readonly _newtype: Tag
-}) &
-  Schema.BottomWithoutNew<
-    Self,
-    S["Encoded"],
-    S["DecodingServices"],
-    S["EncodingServices"],
-    S["ast"],
-    S["Rebuild"],
-    S["~type.make.in"],
-    Self,
-    S["~type.parameters"],
-    Self,
-    S["~type.mutability"],
-    S["~type.optionality"],
-    S["~type.constructor.default"],
-    S["~encoded.mutability"],
-    S["~encoded.optionality"]
-  > &
-  Omit<S, keyof Schema.Top>
-
-export function Newtype<Self>() {
-  return <const Tag extends string, S extends Schema.Top>(tag: Tag, schema: S): NewtypeSchema<Self, Tag, S> => {
-    abstract class Base {
-      declare readonly _newtype: Tag
-    }
-
-    Object.setPrototypeOf(Base, schema.pipe(Schema.brand(tag)))
-    return Base as unknown as NewtypeSchema<Self, Tag, S>
-  }
-}
diff --git a/packages/core/test/newtype.test.ts b/packages/core/test/newtype.test.ts
deleted file mode 100644
index 1bcba5709db..00000000000
--- a/packages/core/test/newtype.test.ts
+++ /dev/null
@@ -1,47 +0,0 @@
-import { expect, test } from "bun:test"
-import { Effect, Schema } from "effect"
-import { Newtype } from "../src/schema"
-
-class UserID extends Newtype<UserID>()("Test.UserID", Schema.NonEmptyString) {}
-class ProjectID extends Newtype<ProjectID>()("Test.ProjectID", Schema.NonEmptyString) {}
-class Port extends Newtype<Port>()("Test.Port", Schema.FiniteFromString) {}
-
-const User = Schema.Struct({ id: UserID })
-
-test("constructs nominal values from the underlying type", () => {
-  const id = UserID.make("user-1")
-  const acceptUserID = (_id: UserID) => undefined
-
-  expect(String(id)).toBe("user-1")
-  acceptUserID(id)
-
-  if (false) {
-    // @ts-expect-error distinct newtypes are not interchangeable
-    acceptUserID(ProjectID.make("project-1"))
-  }
-})
-
-test("preserves constructor validation", () => {
-  expect(() => UserID.make("")).toThrow()
-})
-
-test("decodes and encodes as a schema", async () => {
-  const decoded = await Effect.runPromise(Schema.decodeUnknownEffect(User)({ id: "user-1" }))
-  const encoded = await Effect.runPromise(Schema.encodeEffect(User)(decoded))
-
-  expect(String(decoded.id)).toBe("user-1")
-  expect(encoded).toEqual({ id: "user-1" })
-})
-
-test("preserves the underlying schema validation", async () => {
-  const result = await Effect.runPromise(Schema.decodeUnknownEffect(UserID)("").pipe(Effect.result))
-  expect(result._tag).toBe("Failure")
-})
-
-test("preserves transformed encoded and decoded representations", async () => {
-  const decoded = await Effect.runPromise(Schema.decodeUnknownEffect(Port)("8080"))
-  const encoded = await Effect.runPromise(Schema.encodeEffect(Port)(decoded))
-
-  expect(Number(decoded)).toBe(8080)
-  expect(encoded).toBe("8080")
-})