The minimum is dictated by whoever your IRA custodian is, the max is $2,000/yr. HOWEVER, they need to have enough earned income to dictate a contribution----so to make a $2,000 contribution they must have had income of $2,000 for the year.
Great idea if you can make it work out.
Matt Tuttle
203-609-9077
http://www.wealthadvisors.bigstep.com