Closing or winding down a corporation or LLC varies from State to State. However, in most cases, a certificate of cancellation, tax payment and/or final tax report is required. For example, Delaware requires a Certificate of Dissolution/Cancellation along with the most recent annual report or tax payment. PA corporations require tax clearance (can take up to 2 years) to accompany a certificate of dissolution. NJ corporations also require tax clearance (up to 1 year) and the certificate of dissolution.
If you need assistance with filing at the State level, Worldwide Incorporators Ltd. can assist. We can be reached out 302-477-0500 or email: firstname.lastname@example.org.
Lastly, make sure that your final federal tax return is filed with the Internal Revenue Service. You may want to include a letter indicating that the EIN/Fed ID Number should be cancelled and it's no longer in use.
Please contact your tax professional to assist with the final federal return.