There's one thing we know for sure about Social Security -- it's not sustainable in its current form. According to the latest research, the Social Security trust fund will be depleted by 2033, so something is going to have to change.

However, exactly what is going to change depends on several factors, including who is in charge. The 2016 presidential candidates have a wide variety of plans to fix the system. The slideshow below covers what you need to know.