You can only deduct the tax paid in the year that you pay it. It sounds like you have not yet paid these taxes because you need your 2021 AGI. That means you can report it on your 2022 tax return in the same place you report the Portland Arts Tax. (Since that post, TurboTax has added a specific field for the Portland Arts Tax. I don't know if next year there will be something similar for these new local taxes.)
