Nolo is a company that prints a lot of helpful books. I used their book to form my LLC instead of hiring an attorney.
This link is from their book on tax deductions for the good ol' US of A. You can also find up to date info on other tax info here and other parts of the web site.
http://www.nolo.com/companion/deduct-it!-DEDU.html;jsessionid=BDEF6F4842BA6C1A299BAC413D15D8FE
I don't know why, but you need to copy and paste the entire link above. Do not just click on the blue part.
Maybe others will use this topic to post links to helpful tax and other business related web sites. Please specify what country your links are for.
Getting off topic with funny jokes is always welcome.
gene