No, Form SS-4 is used only to apply for a new EIN. If you need to update or cancel an existing EIN, you must use the appropriate forms provided by the IRS. For updating an existing EIN, you can use Form 8822-B, Change of Address or Responsible Party - Business. For canceling an EIN, you can use Form 147c, IRS Verification of EIN. It's important to use the correct form for the specific purpose you intend to achieve. If you need assistance or have questions about updating or canceling an existing EIN, consult with a tax professional or refer to the IRS guidelines for guidance.