Registered where you have nexus. Nowhere you do not.
Since the Wayfair decision in 2018 a seller owes sales tax wherever it passes a state's economic threshold, physical presence or not. Forty-five states plus DC each set their own rules. We work out which apply to you and file only those.
The whole job, not the visible half.
Everything below is in scope on the plan that includes us sales tax & nexus. Nothing on this list is an add-on.
- Nexus study by state: economic thresholds, inventory location, employees, affiliates
- Registrations in the states where nexus exists, with voluntary disclosure for past exposure
- Marketplace facilitator analysis so you do not remit tax Amazon already collected
- Monthly, quarterly or annual returns filed on each state's cadence
- Sales tax engine setup in Shopify, QuickBooks or TaxJar and Avalara where warranted
- Exemption certificate management for wholesale customers
Three situations we see every week.
Amazon FBA sellers
FBA inventory sits in warehouses across a dozen or more states. Each one is physical presence, though marketplace facilitator laws now mean Amazon collects on those sales.
Shopify and DTC brands
Direct sales are your responsibility in every state where you pass the threshold, commonly $100,000 in sales.
Non-US companies selling into the US
Foreign sellers are subject to the same economic nexus rules. There is no exemption for not having a US entity.
Four steps, then a rhythm.
Nexus study
Sales by state, inventory by state and people by state are mapped against each state's current threshold.
Register
Only where nexus exists. Where past exposure is material we use voluntary disclosure to limit look-back and penalties.
Automate collection
The tax engine is configured so the right rate is charged at checkout by jurisdiction, including local rates.
File
Returns on each state's schedule, with the marketplace-collected portion excluded and the direct portion remitted.
The rules differ. So does the work.
The same service, applied to each jurisdiction's law. Figures checked September 2026.
Economic nexus thresholds are most commonly $100,000 in annual sales into the state; most states have dropped the separate 200-transaction test. Every state with a sales tax has a marketplace facilitator law, so Amazon, Walmart and eBay collect and remit on marketplace sales. Five states have no state sales tax: Alaska, Delaware, Montana, New Hampshire and Oregon, though Alaska has local sales taxes. Checked September 2026.
Everything about the USA ↗One senior accountant. One flat fee. Three countries.
Group figures are Shaazford Global LLC's published numbers across all its service lines.
Amazon collects the tax. Do I still need to register?
In some states, yes, if you have nexus through inventory or other sales, even though the marketplace remits on marketplace transactions. The registration and the return may show zero direct sales but still be required.
What if I have been selling for years without registering?
Voluntary disclosure agreements typically limit the look-back to three or four years and waive penalties. It is materially better than being found in an audit.
Is sales tax charged on digital products and SaaS?
It depends on the state. Around half tax SaaS; treatment of digital goods varies. We classify your products per state.
How much does compliance software cost?
TaxJar and Avalara start at a few hundred dollars a year for low-volume sellers. For sellers in under five states, native Shopify or QuickBooks tax often suffices. We recommend the cheapest tool that is actually correct.
Talk to us about us sales tax & nexus.
Thirty minutes, no pitch deck. Tell us the entities and the countries, and we will tell you honestly what applies and what it costs.