US SALES & USE TAX SERVICES
Complete sales tax compliance outsourcing across all 45+ US sales tax states — accurate multi-state sales tax services covering registration, calculation, filing and remittance. Our sales tax filing services US take the complexity of America's most fragmented tax system off your plate.
US sales tax is one of the most fragmented tax systems in the world — 45 states plus the District of Columbia impose sales tax, each with its own rates, rules, exemptions and filing deadlines, layered on top of thousands of local city and county jurisdictions. A business selling in even a handful of states can face dozens of different filing obligations, each with different due dates and requirements.
Our sales tax compliance outsourcing service manages this complexity end-to-end — from determining where you owe tax (nexus), to registering, calculating, filing and remitting — so you never have to become a 50-state tax expert to run your business.
Our sales tax filing services US cover the complete compliance lifecycle:
Identifying every state where your business has sales tax nexus — physical presence, economic nexus (revenue/transaction thresholds) or marketplace facilitator considerations.
Registering for sales tax permits in every state where nexus is established — a prerequisite for legal tax collection that must happen before, not after, you start collecting.
Determining which of your products or services are taxable in each state — since taxability rules vary significantly (SaaS, digital goods, services are treated differently state to state).
Setting up correct tax calculation in your e-commerce or invoicing platform — applying the right rate for each jurisdiction, including local city and county add-ons.
Preparing and filing sales tax returns across all registered states — on each state's specific schedule (monthly, quarterly, annual) with correct jurisdiction-level breakdowns.
Managing the actual remittance of collected tax to each state, and reconciling collected amounts against filed returns to catch discrepancies before they become audit issues.
Collecting, validating and maintaining resale and exemption certificates from B2B customers — protecting you in the event of a sales tax audit.
Representing your business during state sales tax audits — preparing documentation, responding to auditor requests and negotiating assessment resolutions.
Our multi-state sales tax services are essential for:
Since the 2018 South Dakota v. Wayfair Supreme Court decision, states can require businesses to collect sales tax based purely on economic activity — no physical presence required. This means a business can trigger sales tax obligations in a state simply by exceeding a revenue or transaction threshold there, often without realising it. Combined with varying taxability rules (is your product a taxable good, an exempt service, or something in between?), differing filing frequencies, and the sheer number of jurisdictions, outsourced sales tax management has become less a convenience and more a necessity for any business selling beyond its home state. Getting this wrong compounds quickly — uncollected tax becomes the seller's liability, with penalties and interest accruing from the original due date.
We analyse your sales data across all states to identify where you have crossed economic nexus thresholds, plus any physical presence factors — producing a clear state-by-state exposure map.
We register for sales tax permits in every state with nexus. Where past exposure exists, we evaluate Voluntary Disclosure Agreements (VDAs) to limit look-back liability and penalties.
We determine taxability of your specific products/services in each state, and configure tax calculation correctly in your sales platform or accounting system.
We prepare and file returns on each state's schedule, remit collected tax, and reconcile collections against filings — delivered on a fixed monthly management fee.
We continuously monitor your sales activity for new nexus triggers as you grow into new states, and track rate/rule changes that affect your existing filing obligations.
AAPT & Associates provides sales tax compliance outsourcing as a managed, ongoing service — not a once-a-year scramble. Our multi-state sales tax services team tracks nexus thresholds proactively so you register before an obligation is triggered, not after a state notices you should have. For businesses that have already fallen behind, we structure Voluntary Disclosure Agreements to minimise past liability while bringing you into full compliance going forward.
Sales tax nexus is the connection between a business and a state that requires the business to collect and remit sales tax there. It can be triggered by physical presence (office, warehouse, employees) or economic nexus (exceeding a state's revenue or transaction threshold, typically $100,000 in sales or 200 transactions). Our sales tax compliance outsourcing service identifies every state where you have nexus.
45 states plus the District of Columbia impose sales tax (Alaska, Delaware, Montana, New Hampshire and Oregon do not have a statewide sales tax, though Alaska allows local sales tax). Our multi-state sales tax services manage filings across all applicable states based on where your business has nexus.
A VDA is an agreement with a state that allows a business to come forward and register for a past-due sales tax obligation, typically in exchange for a limited look-back period (often 3-4 years instead of full historical exposure) and reduced or waived penalties. Our outsourced sales tax management service evaluates and negotiates VDAs for businesses that discover past nexus exposure.
It depends entirely on the state — some states tax SaaS as tangible personal property, others exempt it as a service, and rules continue to evolve. Our sales tax filing services US include a state-by-state taxability analysis specifically for SaaS, digital goods and other non-traditional products.
Marketplace facilitator laws in most states require Amazon, Etsy and similar platforms to collect and remit sales tax on behalf of third-party sellers for marketplace sales. However, sellers may still have separate registration and filing obligations, and direct (non-marketplace) sales still require the seller to handle sales tax themselves — a nuance our sales tax compliance outsourcing service navigates carefully.
Uncollected sales tax becomes the seller's liability, with penalties and interest accruing from the original due date — potentially for every year nexus existed. This is common and fixable. Our outsourced sales tax management service conducts a confidential nexus review and, where beneficial, structures a Voluntary Disclosure Agreement to limit your exposure before a state initiates contact.
Most growing businesses discover nexus gaps they didn't know existed. Get a confidential nexus review before a state finds you first.
