How To Write A Letter To The Irs Closing Business . This letter means the irs hasn't received a tax return from you, and it's calculated your. Next, mention the reason why you are closing your business. FREE 11+ Sample Closing Business Letter Templates in PDF MS Word from www.sampletemplates.com Cancelling/deactivating an ein with the irs is technically called “closing a business account”, since eins are never really cancelled. Next, mention the reason why you are closing your business. Mail cancellation letter to the irs.