USA Tax & Accounting
USA Sales Tax Services
Whatever you sell and however you sell it, we handle US sales tax for any type of business — nexus reviews, state registrations and every filing across all 50 states, for one fixed monthly fee.
50
US states covered
4.8★
Trustpilot rating
15+
Countries served
2,000+
Businesses helped
Free USA Sales Tax Calculator
Estimate sales tax for any US state in seconds — add tax to a price, or work out the tax already included in a total.
Auto-filled with the state base rate. Add your local (county/city) rate for an exact figure.
Add tax on top of a net (pre-tax) price.
$0.00
This calculator provides estimates using 2026 statewide base rates and is for general guidance only. Local county and city taxes vary by address and product type, and some goods are exempt or taxed differently. For exact, compliant figures across every jurisdiction you sell in, speak to our team.
What is US sales tax?
Where you owe
When do you need to collect? Understanding nexus
Your obligation to collect US sales tax is triggered by “nexus” — a connection between your business and a state.
Physical nexus
An office, employee, contractor or inventory in a state creates nexus — including stock held in Amazon FBA warehouses, which most sellers don’t realise counts.
Economic nexus (Wayfair)
Since the 2018 South Dakota v. Wayfair ruling, selling into a state can create nexus with no physical presence — most states use a threshold around $100,000 in annual sales.
Marketplace sales
Amazon, eBay, Etsy and Walmart collect and remit tax on marketplace orders for you — but you may still need registrations, and your Shopify sales are always your responsibility.
What we do
What’s included in our USA sales tax service
Everything you need to stay compliant across every state you sell in — handled end to end.
Nexus analysis
A 50-state review of your sales channels, revenue and inventory to pinpoint exactly where you’re liable — and where you’re not.
State registrations
We obtain your sales tax permits in every state you need them — correctly the first time, including for non-resident owners.
Returns prepared & filed
Monthly, quarterly or annual returns filed on each state’s schedule — including the zero returns most states still require.
Platform tax setup
Correct tax-collection settings in Shopify, Amazon, Etsy, eBay, Walmart, BigCommerce and WooCommerce, so you charge the right rate in the right place.
Exemption & resale certificates
We prepare resale certificates for your suppliers and validate the exemption certificates your wholesale customers provide.
Notices & back taxes
State notice in your inbox? Missed past filings? We respond, negotiate and use voluntary disclosure agreements to limit penalties.
Sales data extraction
We pull accurate sales data from your Shopify, Amazon, eBay, Etsy, Walmart, BigCommerce and WooCommerce stores so every return is filed correctly and on time.
Filed return confirmation
After every filing we send you a copy of the filed sales tax return and confirmation for your records.
Who we help
USA sales tax for any type of business
From sole traders to multi-channel brands — retail, wholesale, dropshipping, services, SaaS and more. If you sell into the US, we handle your sales tax. Here are just a few examples:
Shopify & DTC brands
Direct-channel sales are always yours to collect — we make sure your store charges the right tax everywhere.
Amazon FBA sellers
FBA inventory creates physical nexus in warehouse states. We untangle what Amazon collects and what’s still on you.
Non-US residents
Nexus doesn’t care where you live. We register and file for international founders with US LLCs every day.
SaaS & digital products
Software and digital goods are taxable in some states and exempt in others — we map your product to each state’s rules.
Retail & wholesale
Brick-and-mortar shops, wholesalers and B2B sellers — we handle resale certificates, exemptions and multi-state filing.
Startups & small businesses
Just getting started or running a lean team? We keep sales tax simple and affordable so you can focus on growing.
How it works
Sales tax handled in three steps
Free nexus review
Tell us where and how you sell. We analyse your channels and revenue and tell you exactly which states you owe tax in.
Register & configure
We obtain your permits and set up tax collection correctly on every platform you sell through.
We file, you relax
Every return filed on schedule, deadline reminders before anything is due, and a dedicated accountant one message away.
Pricing
Simple, transparent pricing
Fixed-price packages for US sales tax registration and filing — choose a plan or ask us for a custom quote.
Basic
Sales tax filing for any 5 states
3-day delivery
- Application preparation
- Documentation review
- Application filing
- Tax audit support
- E-filing services
- 1 consultation session
Standard
Sales tax registration for any state
5-day delivery
- Application preparation
- Documentation review
- Application filing
- Tax audit support
- E-filing services
- 2 consultation sessions
Premium
Return filing, registration & tax certificate
7-day delivery
- Application preparation
- Documentation review
- Application filing
- Tax audit support
- E-filing services
- 3 consultation sessions
Prices shown in USD, per filing. Selling across many states or need ongoing monthly filing? Contact us for a tailored package.
Not sure where you owe sales tax?
Get a free nexus review with your instant quote — in two minutes you’ll know exactly where you stand.
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Why businesses choose Fincsol
USA Sales Tax — Frequently Asked Questions
What is sales tax?
Sales tax is a government-imposed tax on the sale of certain goods and services. In most cases the seller collects it from the customer at the point of purchase and remits it to the state, as required by law.
What is the difference between physical and economic nexus?
Physical presence nexus is triggered by a tangible presence in a state — a storefront, office, employees, property or inventory (including Amazon FBA stock). Economic nexus is triggered purely by sales volume: once your sales into a state cross its threshold (often around $100,000 a year), you must register and collect even with no physical presence.
Do I need to collect sales tax in every US state?
No — only in states where you have nexus, either physical (offices, staff, inventory) or economic (crossing a sales threshold, typically around $100,000 per state per year). Most sellers owe tax in far fewer states than they fear. A nexus review tells you exactly which ones.
What is economic nexus?
Since the 2018 South Dakota v. Wayfair Supreme Court ruling, states can require out-of-state sellers to collect sales tax based purely on sales volume. Each state sets its own threshold — commonly $100,000 in annual sales, with some also counting 200 separate transactions.
Amazon already collects sales tax on my orders — am I covered?
Partly. Marketplace facilitator laws make Amazon, eBay, Etsy and Walmart collect on marketplace orders. But your FBA inventory can still create registration and filing obligations, and everything you sell through Shopify or your own website remains fully your responsibility.
I’m not a US resident — do these rules apply to me?
Yes. Nexus is based on your business activity in a state, not your residency or where your company is formed. A UK, UAE or other international founder with a US LLC selling into the US has the same obligations as a domestic seller — and we register and file for international founders every day.
What if I should have been collecting sales tax but wasn’t?
Don’t panic, and don’t just register quietly — that can expose all your past liability. Many states offer voluntary disclosure agreements (VDAs) that limit how far back they look and reduce or waive penalties. We assess your exposure and handle the process for you.
How often do sales tax returns need to be filed?
Each state assigns you a filing frequency — monthly, quarterly or annually — usually based on your sales volume there. Most states also require zero returns for periods with no sales. We track every deadline so nothing is missed.
Is the sales tax calculator on this page accurate?
It uses 2026 statewide base rates to give a fast, reliable estimate, and you can add your local county/city rate for a closer figure. Because exact rates depend on the customer’s address and the product type, use it as guidance — and let our team confirm precise, compliant rates for every jurisdiction you sell in.
How much does your sales tax service cost?
A fixed monthly fee based on how many states you file in and how often — no hourly billing, no surprises. Use our instant quote to get your price in two minutes, or contact us for a tailored proposal.
Ready to get sales tax off your plate?
Join businesses in 15+ countries who trust Fincsol with the numbers. Get an instant quote, message us, or chat on WhatsApp.