The tax page is useful but well hidden under settings. Many probably don't know it is there.
Perhaps most people wouldn't look at this often enough for it to be on the main icon bar. But the 'settings' option on the main icon bar is actually a "More" menu (aside, I suggest renaming it to More), with the real settings and other items here. The tax information should be on this page instead further hidden in the middle of the second settings menu.
On the tax page, the 'capital gains' and 'taxable income' boxes should be first with 'tax checklist' and 'tax reports' second. I argue that this better orders the information you might want to see on mobile, and you're more likely to be changing any settings here on the web site.