Update August 2015 V2: Disney Infinity have announced the three additional characters coming to Disney Infinity 3.0 and they are Spot from 'The Good Dinosaur' as well as Judy & Nick from 'Zootopia' both of which are new Disney films set to launch this year.
Receipts for income tax payments and other bills related to it must be kept for three years. The Internal Revenue System conducts audit every three years. It will be at your advantage to keep receipts that are vital for your tax deduction as well as credits that you have availed in your tax.
I shred them once the file gets full. It is handy to keep bills for at least 1 year. I do an annual review of past year's utility bills so I know how much dh and I need to budget over the year for household bills and adjust the monthly standing order payments to the joint household account accordingly.