I have a corporate client that was originally based in Alberta, but moved to Saskatchewan in 2016. They found me in early 2018, and I filed their T2 for Dec 2017 with no AT1 because it had not operated in Alberta since 2016. A few days ago, the client got a letter from Alberta Tax and Revenue, saying they haven’t received the AT1 for 2017.
I work in Saskatchewan, and I have filed the occasional AT1 for clients, but am not familiar with all of the Alberta tax requirements. How do you tell Alberta Tax and Revenue that the corporation moved?