Online Sales Tax Rules for Ecommerce Businesses

This decision overturns a 1992 ruling in Quill Corp. v. North Dakota in which the Supreme Court ruled that a business must have a physical presence in a state for that state to require it to collect sales taxes.

That means that any online business did not have to pay sales tax in states where it did not have nexus. However, the topic of online sales tax is rapidly evolving as new laws emerge with the goal of allowing states to charge sales tax by standardizing laws and rates.

In a 5-4 ruling in the summer of 2018, the Supreme Court ruled against Wayfair and other large online retailers, siding with South Dakota, the state on the other side of the case.

Let’s take a look at what this means for ecommerce sites that utilize online payment solutions.

Note that this article is intended for informational purposes only and does not constitute tax advice. For specific tax help, contact a licensed tax specialist.

Previous Rules for Online Sales Tax

Previously, an online business was responsible for collecting sales tax only in states where it has nexus. Nexus refers to the connection that a business has with a given state and determined whether an online business had to collect sales tax on orders shipped to those states. If the business has nexus (a connection) with a state it would be responsible for collecting and paying sales tax on orders shipped to that state. Conversely, a business would not have to collect sales tax on orders shipped to a state where it does not have nexus.

For example, an online business would have to pay sales tax on orders shipped to states where it has offices or warehouse facilities. It would not have to pay sales tax on orders shipped to states where it has no physical presence.

Use Tax

use tax is assessed on untaxed tangible personal property by the state in which a person resides regardless of where the product was purchased.

Essentially, states with sales tax require residents to pay taxes on any products purchased for personal use that were not assessed sales tax by the seller at the time of purchase. Few people actually track and report use tax, and states have found enforcing use tax to be very difficult.

Consumers are responsible for paying use tax on tangible personal property that was not previously assessed sales tax by a business. For example, a person that resides in Louisiana would have to pay use tax to the state of Louisiana for personal products she purchased from an online business based in Arizona.

2018 Supreme Court Ruling – South Dakota v. Wayfair

The 2018 Supreme Court ruling essentially reverses the prevailing guideline of requiring nexus in order to enforce sales tax collection. Now, states can require businesses to collect sales tax when selling online to residents of their state, even if the online retailer has no other business connection to the state.

The implementation of sales tax requirements as a result of the Supreme Court’s ruling may take awhile. CNBC notes that many states would have to pass legislation regarding sales tax collection before they could enforce it.

Is the Supreme Court ruling for online sales tax good or bad?

It depends on who you ask and what their priorities are. Supporters of the ruling (those on South Dakota’s side) argue that not requiring online businesses to collect sales tax gave them a competitive advantage over brick and mortar stores, which are required to collect sales tax. Some states also point to the fact that the lack of sales tax paid on those purchases hurt state revenues. States stand to receive more money from sales tax as a result of this ruling.

Both of these arguments were part of Justice Kennedy’s majority opinion explaining the rationale behind the ruling.

Opponents of the ruling (those on Wayfair’s side) claim that it will hinder innovation for smaller businesses and subject them to a complex maze of tax requirements – a concern expressed by Chief Justice Roberts, speaking for the minority dissent. Others lament the possibility of consumers paying more for products they buy online. (The New York Times reports that many states already require consumers to pay use taxes when purchasing online, but notes that in practice, consumers rarely pay such a tax.)

Chief Justice Roberts also stated that the reasons to overturn precedent are insufficient and argued that this was a matter for Congress.

Affiliate Nexus Tax

Prior to the 2018 ruling, some states had passed or were in the process of passing laws that broaden the definition of nexus to include affiliate marketers. Affiliate nexus tax laws (also called “Advertising Tax” or “Amazon Tax”) required businesses to pay sales tax on orders shipped to states where it has an established presence of affiliate marketers.

Affiliate tax nexus laws have been met with fierce opposition from industry groups like the Performance Marketing Association and online retailers like and that have ended affiliate programs in states with affiliate nexus laws such as Connecticut.

The ruling in South Dakota v. Wayfair may render affiliate nexus tax requirements unnecessary, however, we’re preserving the following section on affiliate nexus laws for historical reference.

Affiliate Nexus Laws by State – Historical Purposes Only

Note: This section refers to Nexus laws prior to the 2018 South Dakota v. Wayfair ruling and may not be accurate going forward. Check with a lawyer or tax preparer in your state for the most up to date requirements regarding collecting sales tax online.

The following is a list of states that have current, pending or repealed laws pertaining to affiliate nexus. Quite a few states are in the process of enacting or even repealing such laws, so be sure to check with a tax professional in your state regarding your business’s current tax responsibilities.

The Performance Marketing Association also has a list showing the status of affiliate nexus laws by state.

  • Arkansas: Affiliate Nexus
  • California: Affiliate nexus – Enacted and then repealed on Sept 23, 2011 for a period of one year.
  • Colorado (Law Currently Stayed) – Refer to the Web site for the Colorado Department of Revenue for the most recent information.
  • Connecticut: Affiliate Nexus
  • Illinois: Affiliate nexus
  • New York: Affiliate Nexus
  • North Carolina: Affiliate Nexus – Currently active, moving toward repeal.
  • Pennsylvania: Affiliate nexus – Effective no later than February 1, 2012
  • Rhode Island: Affiliate nexus – Currently active.
  • Vermont: Affiliate nexus (sort of) – Vermont’s affiliate nexus law will not go into effect until Section (13) Sec. 36a of H.436 is fulfilled that requires fifteen other states to enact an affiliate nexus law before Vermont’s law will take effect. This stipulation leads many to believe that Vermont’s affiliate nexus law won’t go into effect for years, if ever.

Online Sales Tax Laws by State

As noted earlier, the application of sales tax collection requirements may require new state laws. The complexities and inconsistencies in sales tax laws among states have served as a barrier against the implementation of an efficient and enforceable sales tax system for online purchases.

At the time of this article update, the Supreme Court ruling is very new, and many states are still considering how to proceed. We’ll continue to update this article as information becomes available.

Online Sales Tax & Legislation

In the dissent for South Dakota v. Wayfair, Chief Justice Roberts indicated that this issue is better suited for Congress than the Court.

In fact, there have been proposed laws, including the Marketplace Equity Act, Main Street Fairness Act, and Marketplace Fairness Act, that aimed to require online retailers to collect sales tax in a manner consistent with physical brick and mortar businesses.

The Marketplace Fairness Act was introduced in the Senate on November 9, 2011 (S.1832) by Mike Enzi (R-Wy), Lamar Alexander (R-TN), Dick Durbin (D-IL) and seven other bi-partisan Senators.

The Marketplace Equity Act was introduced in the House on October 13, 2011 (H.R. 3179) by Rep. Steve Womack (R-AR) and Rep. Jackie Speier (D-CA).

The Main Street Fairness Act was introduced in the house on July 1, 2011 (HR-5660) by Rep. John Conyers (D-MI), and in the Senate on July 29, 2011 (S.1452) by Sen. Richard Durbin (D-IL).


This article is not intended as legal or tax advice for businesses or consumers. If you have questions about a specific situation, be sure to contact a licensed attorney or CPA.

1 thought on “Online Sales Tax Rules for Ecommerce Businesses”

  1. As a Pennsylvania resident and PA affiliate marketer, I am very upset and worried about the impending PA Affiliate Nexus Tax Law. This will hurt many people financially, will result in LOSS of revenue to the state from income taxes that PA affilate marketers will lose, and may even cause an additional burden to the Commonwealth of PA because some of the affilate marketers that are derving their entire livelihood from affiliate marketing may not be able to find jobs to replace their income. Thefore, I urge PA affilates to write to your state representatives at: and lets kill this law before it has a chance to live.

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