Are the prices listed on the home page for domains quotes per month or quotes per year?
If you're referring to this pricing page for Domains https://www.godaddy.com/tlds/gtld.aspx?ci=85488&isc=gdcommprvm, then the price is for a year. Please let us know if you have any other questions. Take care!
when you purchase a domain you get charge 11.99 plus tax what is that for?