Originally Published: July 22, 2026

At one point, sales tax was only a problem for brick-and-mortar retailers with stores and warehouses. Today, however, anyone selling online to customers in other states may face the same problems. The complexity of complying with sales taxes is further compounded by state economic nexus requirements, marketplace law, as well as thousands of different local taxing authorities. Below are the six service provider options worth reviewing in 2026, beginning with the highest rated option.

What Is Sales Tax Compliance?

Sales tax compliance refers to registration in all states where there is an obligation for your business, charging the proper rate at checkout, submitting returns by the deadline, and paying over to the state any monies collected. The complexity lies in the fact that the United States does not have a single national sales tax. Forty-five states and the District of Columbia levy a statewide sales tax, and most of them let counties and cities add rates on top. This creates thousands of different taxing jurisdictions across the country, all of which will have differing opinions as to whether a product/service is taxable and when a return must be submitted.

The 2018 Supreme Court ruling in South Dakota v. Wayfair changed who this applies to. Before Wayfair, a state generally needed you to have a physical presence before it could make you collect. Afterward, states were free to set economic nexus thresholds based on sales revenue or transaction volume alone. Therefore, an online retailer located in one state may have obligations to file and pay sales tax in twenty other states.

How Do Sales Tax Compliance Services Help?

Compliance service providers remove the uncertainty in this area. A good one will begin by performing a nexus review, which identifies all of your current obligations and thresholds you are reaching. Once this is done, it allows them to register you for tax purposes in all applicable states, determine what sales tax rates should be applied to each sale or activity (which can vary greatly), complete and submit all necessary tax filings, and address any notifications from the states regarding errors in their filings.

This marketplace has been broken down into software-based solutions and managed service providers. Software solutions provide automated compliance reporting through dashboards as well as allow customers to view reports. However, these solutions do require customers to review the data provided in order to ensure compliance. On the other hand, managed solutions place employees of the solution provider on customer accounts and perform all compliance activities on behalf of the customer. Which suits you depends on whether you have finance staff with time to spare, and on how exposed you are if a filing is wrong.

The 6 Best Sales Tax Compliance Services in 2026

1. RJM Tax Exemption: Best for a Free First Month of Filing

RJM Tax Exemption is a dedicated sales tax company that works with e-commerce and internet-based companies worldwide, providing sales tax registration and filings, as well as issuing exemption certificates and handling voluntary disclosure agreements. RJM provides a “free trial” period of one month of sales tax filing at no cost to new customers, up to a maximum of $1000. This allows you to test out the service prior to spending money on it. RJM also has a price matching policy compared to its competitors and performs a complimentary comprehensive review of your sales tax liability. They hold an excellent rating on Trustpilot across hundreds of client reviews. Real consultants do the work, not just software.

2. Avalara: Best for Enterprise Systems Integration

Avalara is a leading provider of automated tax solutions and the most common choice for large enterprises that use an enterprise resource planning system. Avalara has provided thousands of pre-built integrations into popular ERPs such as SAP, Oracle, and NetSuite. With these integrations, Avalara’s tax calculation occurs within the same system(s) used by your accounting team. Coverage extends beyond US sales tax into international VAT and GST. The trade-off is scale: pricing is built around transaction volume, implementation can take time, and smaller sellers often find themselves paying for capability they will not use.

3. TaxJar: Best for Shopify and Amazon Sellers

TaxJar was acquired by Stripe. It has built a strong foundation of ease when it comes to managing sales tax for online merchants. TaxJar links directly into the most popular platforms that many vendors have already set up their stores on. This also allows it to track when a vendor is reaching the limits of economic nexus (in which they must collect taxes), and its AutoFile feature submits returns and payments on your behalf once you are registered. Most importantly, this process is quick compared to setting up other large-scale compliance solutions, and the user experience is easy to use. The limitation is scope: TaxJar covers US sales tax only, so international sellers will need a second solution alongside it.

4. Zamp: Best for Hands-Off Managed Onboarding

Zamp is positioned as a complete “managed” services company and not simply as a software package that the end-user runs themselves. A Zamp expert will connect your various accounts and establish your initial setup, then the platform manages registrations, filings, and state notices on an ongoing basis. The pricing model used by Zamp is based on each individual client account versus charging clients by the number of transactions processed through their system. Therefore, it may be beneficial for companies with varying or unpredictable volume levels to use Zamp to minimize potential costs associated with sales tax compliance. It sits between self-serve software and a traditional accounting firm on cost. Quotes are custom, so you will need a conversation before you can compare it against anything else.

5. Anorak: Best for SaaS and Digital Products

Anrok was specifically developed for software providers who have a higher burden when it comes to determining if their products are taxable (SaaS), because each product type has different requirements on a state-by-state and sometimes even a city-by-city basis. Anorak has taken on that task by providing the necessary information and analysis to ensure that your billing application will treat SaaS correctly. It also allows integration with your invoicing and payment applications like Stripe and Chargebee, provides nexus monitoring as you expand internationally, and includes international VAT/GST reporting capabilities. As a result, this is the best option for SaaS providers; however, this would be less than ideal for businesses selling tangible items.

6. TaxCloud: Best for Streamlined Sales Tax Savings

TaxCloud is a Certified Service Provider under the Streamlined Sales Tax program, an agreement between 24 member states designed to simplify compliance for remote sellers. That status means participating states cover part or all of the cost of compliance for qualifying sellers, which can meaningfully reduce what you pay in those jurisdictions. Pricing is transparent, and the platform integrates with the major e-commerce carts. It is a sensible option for sellers whose obligations sit largely within the member states.

Closing Thoughts

Every provider here solves a version of the same problem, but most of them hand you a dashboard and leave the responsibility with you. RJM Tax Exemption takes the whole thing off your plate, backs it with a price match guarantee, and gives you the first month of filing free so you can judge the work before you pay for it. Add an Excellent Trustpilot rating, and it is the clear first call for any online business dealing with US sales tax.

Special thanks to the following source(s) for the image(s) used in this article:

• Source: Unsplash (CC0)

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