The instructions on the CT 1040WH say, "To prevent any delay in processing your return, the correct year’s form must be attached to the back of Form CT‑1040, Form CT‑1040NR/PY, or Form CT‑1040X and submitted to the Department of Revenue Services (DRS)."
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"