When the budget period is different from "one month" and the user is looking at a period other than the current period, the button at the top to take the user back to the current budget is labeled "Back to This Period". To me, while "this month" is the standard way that (nearly) all apps including calendars refer to the current month in such contexts, "this period" means "the period you're looking at" before "the current period," so I always have to think twice to remember what the button means. Others may feel differently, so I can understand if you decide to leave it as it is, but I suggest changing "this period" to "the current period" (or maybe just "current period" for brevity).