8 Common Multi-State SUT Registration Issues (and How to Avoid Them)

In short: SUT registration means getting a sales and use tax (SUT) permit in every state where a business has nexus, before it collects tax there. Since the 2018 South Dakota v. Wayfair ruling, remote sellers can trigger this through sales alone. The most common multi-state SUT registration issues are poor threshold tracking, incomplete data, missed deadlines, the wrong permit type and conflicting nexus dates.

Updated October 2026: We added a table of verified nexus thresholds and registration deadlines, the January 2026 Illinois threshold change, and current Streamlined Sales Tax registration facts.

The South Dakota v. Wayfair Supreme Court ruling of June 21, 2018 changed who must collect sales tax. Many businesses that never had to register now must. They must follow the rules in each state and keep up with rate and law changes. Getting a sales tax permit in each nexus state is a key compliance step.

The process is detailed. This is especially true for remote sellers, e-commerce companies, non-US businesses with US sales, and companies with nexus in only a few states. This guide is written for CPAs and advisors, but business owners will find it useful too.

What is state SUT registration?

State SUT registration is the process of getting a sales tax permit, also called a seller’s permit, before you collect and remit tax in a state. When a business establishes nexus in a new state, it must get this permit first. The permit lets the business collect sales tax from customers and pay it to the state.

Researching each state’s requirements takes a lot of time. Most businesses don’t have the resources to do it alone, so CPAs often get involved.

The detail involved leads to avoidable mistakes. Here are the eight most common issues we see, and how to help clients avoid them.

What are the 8 most common multi-state SUT registration issues?

The eight issues are:

1. Inconsistent tracking of sales against nexus thresholds
2. Incomplete data that hides nexus
3. Missed registration deadlines
4. An “ask for forgiveness later” approach
5. Applying for the wrong type of permit
6. Reacting to problems instead of preventing them
7. Underestimating the data needed to register
8. Unresolved physical nexus that changes the date of first business

Issue #1: Why does inconsistent tracking of sales against nexus thresholds cause problems?

Inconsistent tracking causes missed registrations, because every registration duty starts with nexus. For most remote sellers, economic nexus is the main trigger. But thresholds are not one size fits all. They differ by state in both the amount and the types of sales that count.

Some states use only a sales amount. Others also use a transaction count. These tests change too. For example, Illinois dropped its 200-transaction test on January 1, 2026. Only the $100,000 sales test now applies there.

See our full guide to economic nexus by state for every threshold.

Agree a clear process with each client for checking thresholds monthly or quarterly. Write down who owns each step: the business owner or the CPA.

Issue #2: How does incomplete data cause missed nexus obligations?

Incomplete data causes missed obligations because a nexus study is only as good as its data. If transactions are missing, the study gives false results. This happens far more often than it should.

Businesses often pull data for a nexus study from their general ledger or raw data files. Both have gaps:

• General ledger: may lack the detail needed to find nexus. Revenue reports are often too high-level, integrations drop data, and sales tax liability reports can be wrong.
• Raw data files: often show invoice-level rather than line-level data, mix date formats, and contain address errors such as missing ZIP codes.

CPAs should help clients identify the data to pull and set up an accurate nexus tracking report. At minimum, extract these details for every transaction:

• Transaction date
• Invoice number
• Ship-to or transaction location (full address)
• Total invoice amount
• Total sales tax collected

Find every source system that holds these details. This includes invoicing systems, online stores and marketplaces such as Shopify or Amazon, and 3PL (third-party warehousing and fulfillment) data.

Issue #3: How do you keep track of registration deadlines?

You keep track of deadlines by keeping an up-to-date record of each state’s rules, because every state sets its own. Here’s how states have handled nexus registration deadlines:

The rules vary widely and change often. Texas, for example, gives remote sellers until the first day of the fourth month after they cross its threshold. New York expects registration within 30 days.

Keep a single, current register of state deadlines. It helps clients register on time and avoid penalties.

Issue #4: Why is an “ask for forgiveness later” approach risky?

It is risky because states actively look for unregistered sellers, and the bill grows every month. Many businesses notice they crossed a threshold but decide to wait. They assume the state will take years to notice. That is a costly bet.

Encourage clients not to take this approach, for three reasons:

• States are better at finding sellers. They use data analytics, third-party data, web searches and information from marketplaces and fulfillment providers.
• Inventory leaves a trail. Stock held in a state, for example in an Amazon FBA warehouse, creates physical nexus that states can identify.
• Audits cost more. A business found in an audit usually pays more in penalties than one that registered on time. It may also lose access to a voluntary disclosure agreement, which needs no prior contact from the state.

Explain these risks to clients. Start with the clients most likely to face penalties.

Issue #5: Which type of sales permit should you apply for?

The right permit depends on how the business sells, because states issue different permits for different types of sellers. Registration should be simple, but this step often confuses people.

For example, an in-state business with a physical presence may need a different permit from an out-of-state remote seller. Many states also use different returns for each. Picking the right permit at the start makes filing much easier later.

CPAs should know the permit types in each state and any special programs clients can use, such as the Streamlined Sales Tax system (see below).

Issue #6: What goes wrong when you are reactive, not proactive, with SUT compliance?

When you are reactive, you have to untangle a nexus problem after it has grown. This is a common scenario. The client arrives having missed a registration, and the advisor has to fix it.

At that point, the client has two options:

1. Ignore the period when they were non-compliant.
2. File late returns and pay penalties and interest.

Remind clients that the registration form is signed under penalty of perjury. The client must declare a business start date in the state. A start date before the registration date is likely to trigger questions about missed filing periods. Using today’s date when nexus started earlier creates a problem with the attestation. A VDA can sometimes offer a cleaner route, if the state has not yet contacted the client.

The better answer is a proactive SUT advisory program. Review client sales before they cross any threshold. Then registering on time becomes a routine step.

Issue #7: Why is data gathering for registration such a big job?

It is a big job because state registration forms ask for a lot of information. Clients need these details ready:

• Corporate information
• Business activity (NAICS codes, types of tangible personal property sold)
• Ownership information, including sensitive personal details
• Accounting information, such as where books and records are kept
• License information, including the right license type

Forms also ask for tax liability start dates and physical presence details, such as the number of in-state employees. Non-US clients face extra questions. For example, many lack a US tax ID. The Streamlined Sales Tax system lets sellers with no US tax ID and no US address register without one.

Gathering all this in one secure place takes effort. But it saves a lot of time when each new registration comes up.

Issue #8: How do unresolved physical nexus issues affect the date of first business?

Unresolved physical nexus can move the date nexus began, which changes the period when tax should have been collected. During registration, the client must give a key date. Forms call it the “date of first business”, “date of first transaction” or “date nexus first established”. The client must also attest that the application is true and correct.

Many applications contain conflicting information. For example, the client lists employees or inventory in the state from an earlier date than the “date of first transaction” they give. Physical nexus can come from:

• Employees or contractors working in the state
• Inventory in a warehouse, 3PL or FBA center
• Offices or other property

If these facts are recorded wrongly, the nexus date can move. That changes the period for which the business owes tax. Check all of these triggers before you file.

What are the best practices to streamline SUT advisory?

The best practices are to create an action plan, survey clients to find the highest risks, and use multi-state registration where it helps. Wayfair has been law since 2018. Every state with a statewide sales tax now has an economic nexus rule. If you’re only now talking to clients about it, you’re behind. But it’s not too late to get proactive.

Best practice #1: How do you create an action plan?

You create an action plan by writing down a formal process you can share with clients and across your firm. Compliance is expensive, but non-compliance costs more. Present the plan at partner sessions and training meetings.

An ideal plan will:

1. Focus on economic nexus first.
2. Overlay physical nexus where it applies. This helps you find issues caused by remote workers or FBA and 3PL inventory.
3. Define “registration triggers” and a workflow for each. Examples include sales volume, transaction volume, new employees, remote workers, independent contractors and inventory locations.
4. Explain how to spot high-risk clients. These include larger, fast-growing sellers, merchandisers, digital goods and SaaS businesses, and clients registered in only one state.

Best practice #2: How do you survey clients to identify those with the highest risk?

You survey clients by reviewing each account you support for red flags. Look for fast sales growth, new states, new warehouses and new staff locations. If a business shows signs of non-compliance, run a nexus study to confirm where it must register.

Best practice #3: How can you take advantage of multi-state registrations?

You can register a client in several states at once through the Streamlined Sales Tax Registration System (SSTRS). It covers the 23 full member states and Tennessee as an associate member. You can pick all of them or only the states you need, and add more later.

Points to know:

• There is no fee to register through SSTRS in a state where you have no legal duty to register. Some states may charge a fee where you do.
• Registering does not wipe out past liability. Only Tennessee currently offers amnesty through SSTRS.
• SSTRS covers member states only. Large states such as California, Texas, New York and Florida are not members, so you register with them directly.
• Sellers can use a Certified Service Provider (CSP), which is free in states where the seller is CSP-compensated.

Use SSTRS when it’s in the client’s best interest, and make sure your team knows how it works.

How can you get help with multi-state SUT registration?

A specialist can track thresholds, prepare registrations and file returns across states. For foreign businesses, see our guide to US sales tax for foreign sellers. Taxually’s LumaTax handles US sales tax compliance. Book a free call with one of our sales tax experts to discuss your clients’ needs.

Sources

• Texas Comptroller: Remote sellers
• Illinois Department of Revenue: Bulletin FY 2026-12
• Sales Tax Institute: New York guidance for remote sellers
• Streamlined Sales Tax: Registration FAQ
• Wisconsin Department of Revenue: Streamlined Sales Tax member states
• California Department of Tax and Fee Administration: Use tax collection requirements for remote sellers
• Georgia Department of Revenue: Policy Bulletin SUT-2019-02 (remote seller thresholds)

How Taxually handles this

Taxually’s LumaTax runs a nexus analysis on your sales, helps you register in the states where you must collect, and prepares and files multi-state sales tax returns, including Canadian GST/HST. LumaTax is currently available to enterprises and accounting firms. For the full workflow, read how to automate US sales tax filing in every state.

Related guides

• What Is Click Through Nexus?
• Which Businesses Qualify for Sales Tax Exemptions?
• Sales And Use Tax Compliance Tips For Firms