If you're running any kind of business, there are lots of rules and regulations surrounding sales tax. If your business made more than $60,000 profits in a single year or over $60,000 on average during the last 12 months (including the current month), or is expected to make that much profit this time around, then you might be required to register for GST before December 31st. There are some exclusions as well as special rules if your business is small or foreign-owned. It's best to contact us if you have any questions.