Sorting your paperwork can be a real pain! The "file, act, delete" system that Peter described is great for getting things into shape, or keeping them from overtaking your home office!
Here's a website that breaks down what personal documents need to be kept for up to 3 years, 7 year, and forever:
http://www.associatedcontent.com/article/130464/how_long_should_i_keep_my_personal.html?page=2
Hope that helps,
Selah
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