FAQs - Commercial Activity Tax (CAT)

What do I need to do to make a correction to a tax return that has been filed?

You will need to file an amended return. Quarterly taxpayers will be required to file an amended return via the Ohio Business Gateway (business.ohio.gov). Annual taxpayers will be required to file electronically as well beginning January 1, 2014. Annual filers may file an amended return via the Ohio Business Gateway (business.ohio.gov). Alternatively, annual filers may file an amended return via TeleFile beginning in April 2014. You should select the annual return that corresponds to the tax year that you wish to amend.