Hi, I am preparing this tax return for a client. He works in the US but lives and is a resident of Canada. He allocated his W-2 income in the US based on days he is in the US and days in Canada. The previous accountant filed a resident return and have notes added on how the income should be allocated between the two countries. To be honest I would have filed a nonresident return which I know has income allocation scheduled. But I want to be consistent with what was filed in 2021. My issue now is where and how do I explain the allocation on the return.