How do I report a change in ownership of an S Corp? Originally (2012) the S Corp was set up with 2 owners each 50% owners (Father and Son). Since Jan of 2013, the son is the sole owner at 100% ownership. We have filed an extension for 2013 but are now ready to file. Who do we need to report this change to? Is there a form to report this change to the IRS? What about NYS? Please advise. Thank you and have a great day.