Know Before You Owe
Automated sales tax nexus monitoring for e-commerce sellers. Connect your store, track every state's economic nexus thresholds, and get alerts before you're required to register and collect tax.
No credit card required. Set up in under 5 minutes.
The $100K trap most sellers don't see coming
Since the 2018 Wayfair Supreme Court ruling, every state with sales tax can require out-of-state sellers to collect and remit sales tax once they cross economic nexus thresholds. Most sellers don't realize they've crossed the line until it's too late — facing back taxes, penalties, and interest.
46+ States
Each with different thresholds, periods, and rules to track
Penalties + Interest
States charge back taxes plus penalties if you don't register on time
Multi-Platform
Sales from every store count toward thresholds — you need the full picture
How it works
Get set up in under 5 minutes. No spreadsheets, no manual tracking.
Connect your store
Link your Shopify, WooCommerce, or Square store in minutes. We securely pull your order data and aggregate sales by state.
See your nexus map
Your interactive dashboard shows exactly where you stand in every state — color-coded from safe to exceeded.
Get alerts early
Receive email alerts at 50%, 75%, and 90% of each threshold — so you can plan ahead, not scramble after the fact.
Everything you need to stay compliant
Stop guessing about sales tax nexus. NexusMonitor handles the monitoring so you can focus on growing your business.
Connect your sales platforms and we automatically track your sales against every state's economic nexus thresholds daily.
Connect Shopify, WooCommerce, or Square in minutes. See your combined nexus exposure across all your sales platforms in one dashboard.
Get notified at 50%, 75%, and 90% of each state's threshold — well before you owe anything.
See your nexus status across all 46+ states on an interactive US map. Green, yellow, and red at a glance.
States change their nexus rules. Pro plan monitors all 46+ jurisdictions and alerts you when thresholds change.
When you cross a threshold, Pro plan users get step-by-step guidance — registration links, deadlines, required documents, and a preparation checklist.
See it in action
This is what your nexus dashboard looks like. Click any state to see its status. Sample data shown for a multi-state e-commerce seller.
Built for e-commerce sellers
We track every threshold so you don't have to.
46+
States monitored
Daily
Automatic data sync
5 min
Setup time
$0
To start — no credit card
How we compare
NexusMonitor is the only tool purpose-built for pre-nexus monitoring. We catch the problem before it becomes one.
| Feature | NexusMonitor | TaxJar | Avalara | Manual |
|---|---|---|---|---|
| Pre-nexus threshold monitoring | ||||
| Automatic sales data sync | ||||
| All 46+ state thresholds tracked | ||||
| Early warning alerts (50/75/90%) | ||||
| State rule change monitoring | ||||
| Registration guidance | ||||
| Tax calculation & filing | ||||
| Starting price | $19/mo | $99/mo | Custom | $0 + your time |
Simple, transparent pricing
Start free for 14 days. No credit card required. Scale as you grow.
$19/mo
- 1 platform — Shopify, WooCommerce, or Square
- Up to 10 states monitored
- Dashboard & nexus map
- Customizable threshold alerts
$39/mo
- Unlimited platforms (Shopify, WooCommerce, Square)
- All 46+ states monitored
- Aggregated sales across all platforms
- Threshold alerts for all 46+ states
$69/mo
- Everything in Growth
- State registration guidance
- Compliance rule change alerts
- PDF nexus report export
Frequently asked questions
Everything you need to know about NexusMonitor and sales tax nexus.
Stop guessing. Start monitoring.
Join e-commerce sellers who use NexusMonitor to stay ahead of sales tax obligations. Free for 14 days, no credit card required.