If you or your business sells product on Amazon using the Fulfillment by Amazon (FBA) service, you are well into the multi-state sales tax mess ... even if you are not aware of it. You may be asking yourself:
• Do I now need to register my business with every state and collect tax on their behalf?
• Do I really have physical nexus? What about economic nexus? What is nexus?

Background The old sales tax standard required you to collect and remit sales tax only in states that you have a physical presence (also known as physical nexus). The recent South Dakota vs. Wayfair, Inc. decision by the Supreme Court then legitimized the concept of economic nexus. This means your business could be required to collect and remit sales tax based on where you ship a product and not whether you ever set foot in a particular state (economic nexus).

The bigger mess States were quick to jump on the bandwagon and actively identify Amazon, Ebay and Walmart sellers to demand sales tax for website sales. Some states, like California, got even more aggressive and decided that FBA sellers actually have physical presence because Amazon may put your product in a warehouse in their state. They got seller lists from Amazon and sent out threatening letters to small sellers demanding back sales tax, even though businesses have no way to retroactively collect the tax because the customers are Amazon customers.

Marketplace facilitator to the rescue? To help address this mess and alleviate the need for small businesses to collect and remit sales tax forms to 50 states, many states acknowledged the problem and have passed what is called Marketplace Facilitator laws.

In short, its on the facilitator, NOT you. States with these laws require Amazon, Ebay and similar companies that facilitate sales for resellers to collect and remit sales tax on reseller Amazon activity. There are more than 30 states that have adapted these laws.

You DO NOT need to register your business to collect sales tax in states that have Market Facilitator legislation unless you are otherwise required to do so.
What you need to know
• Know the states. Know which states have Marketplace Facilitator laws. If you dont, you could unwittingly register your business with a state when you do not have to do so.
• Some states deploy deceptive tactics. For example, California passed a Marketplace Facilitator law effective October 2019. Despite this law, the California Department of Tax and Fee Administration (CDTFA) is actively soliciting (threatening?) small businesses who sell on Amazon to register and remit sales taxes for a time period prior to this date without disclosing the new law. To make matters worse, their sales tax registration form could make you personally liable for business-related sales tax and disclose your confidential supplier list. It may also be filled with other legal entrapments.
• Know the minimums. Even states without Marketplace Facilitator laws typically have minimum thresholds before they require you to collect and remit sales tax. Every state is different, but the typical limit is 200 transactions or $20,000 in sales.
• Check out streamline states. Collecting and remitting sales tax is a daunting task for any small business. Using a third party sales tax administrator is very expensive. There is some help, albeit still complicated, for registering with 23 states that are part of a streamline sales tax agreement.Sales tax collection in multiple states is not for the faint of heart. Streamline Sales Tax and Bill Track 50 are a few of the popular sites that can help.