Online shopping continues to increase in popularity. But it's not just the convenience of having a package arrive at one's doorstep without having to trudge to the mall that many shoppers prefer. Some online retailers do not collect sales tax on purchases, meaning that online shoppers in Michigan have historically been able to avoid paying Michigan's 6 percent sales tax - which Michigan bricks and mortar retailers are required to collect at the time of purchase. That's not to say that online purchases are tax free, as Michigan residents are obligated to report online purchases on their tax returns and pay 6 percent use tax. But most taxpayers ignore - or are not even aware of - this obligation.

Michigan retailers have long lamented what they perceive as an un-level playing field in their battle with online retailers, and the state government estimates that hundreds of millions of dollars in tax revenue is not collected every year on online purchases. If a recently passed law has its intended effect, sales tax collections on online purchases should experience a surge.

Earlier this year, Michigan Gov. Rick Snyder signed into law PA 553-554, which requires remote sellers - including Internet sellers who don't have a physical presence in Michigan - to collect sales tax on sales made to Michigan residents. Gov. Snyder remarked that “We want a fair, level paying environment for people to be successful. That’s the way it should be.”

Michigan follows the lead of other states that have moved to pump up sales tax collection in the absence of broader federal legislation that would require tax collection on all online interstate commerce. The new bill, dubbed “Main Street Fairness” legislation or the “Amazon Tax,” will go into effect with the start of the new fiscal year on October 1, 2015.

By way of background, the taxation of out-of-state Internet retailers is governed by the U.S. Supreme Court's 1992 decision in Quill v. North Dakota.  In Quill, the Supreme Court held that a state cannot require an out-of-state retailer to collect and remit sales tax unless the retailer has a "substantial nexus" with the state. A "substantial nexus," as a general matter, requires the retailer to have employees or offices in the state. Thus, Quill has historically thwarted the ability of states to mandate that out-of-state Internet retailers collect and remit sales tax.

As described by the State of Michigan in a Notice published regarding the “Amazon Tax”:

The new law creates a presumption that a seller is engaged in the business of making sales at retail in Michigan if the seller, or another person on the seller’s behalf, engages in or performs certain activities set forth in the new statutory sections in Michigan. In addition, a seller will be presumed to be making sales in Michigan if the seller enters into an agreement with one or more Michigan residents under which the resident, for a commission or other consideration, refers potential purchasers (e.g., by a link on an internet website or an in-person oral presentation), to the seller. This is sometimes referred to as “click-through” nexus.

The new tax collection requirements will not impact some mall businesses. There is a safe harbor for businesses that have less than $50,000 in gross receipts during the preceding 12 months.