Yeadeve

Hi I've started collecting coins, however I'm curious about the laws on selling things like this that might appreciate in value. Will they be liable to income tax, or is there another tax for selling things? I can't imagine I'll run into a situation like that any time soon, but my curiosity has got the best of me I've looked at sites like this tax site but can't find much about it myself - could someone point me to some useful sites? Cheers!