Our spending is easy enough to keep track of when it comes to fixed payments and monthly bills, but those are things we can plan around and budget for. What about those hidden expenses that we don't, or can't, see coming until we're staring at our bank account in confusion? We can be knocked off our budget by things such as hidden bank fees, high energy costs, or even something as simple as a magazine or gym subscription. What you may not know is that a lot of the expenses you're currently paying are completely unnecessary.