It was announced late last year, and unfortunately for Massachusetts residents, it will begin later this week. Namely, the deal struck between the Commonwealth of Massachusetts and online retailer Amazon.com last December by which Amazon will begin collecting the Massachusetts' 6.25% state sales tax, will go into effect this Friday, November 1st. So, only a few days remain for tax-free shopping on Amazon.

The deal will be in place just in time for the upcoming holiday shopping season. Massachusetts anticipates they will be able to collect over 36 million dollars in revenue during the 2014 fiscal year due to Amazon collecting sales tax. 

More information can be found here:

http://www.gazettenet.com/blogs/theconspicuousconsumer/8940148-95/cry-me-a-river-soon-shopping-at-amazon-will-no-longer-be-tax-free-in

and here:

http://www.boston.com/businessupdates/2012/12/11/amazon-com-will-begin-collecting-taxes-massachusetts-governor-deval-patrick-says/WQnr45OToz1PRMH7nLcPZM/story.html