I have a S corporate but I closed the business so I need to know what should I do to close the business in the IRS and what else I need to do?
Thanks for your Help :)

If you have paid all of your taxes and paid all of your creditors, you are done.

Keep the business as a 0 business and submit forms of $0 income to the IRS in future years, but in the mean time, you can always start the business back up in the future.