This is worth a read if you’re a freelancer or small business although more aimed at the small business i think.
http://bitsythis.com/accounting/what-budget-2011-means-for-freelancers-and-small-businesses/
This is an old post
This post was written a long time ago when I wasn't very good at writing, subtlety, or, well, much really. It is probably very cringy - read at your peril.