Sales Tax Nexus Is a Moving Target. Stop Guessing.
NexusFlag monitors your sales, employees, and inventory across all 50 states and alerts you the moment you trigger nexus.
14-day free trial. No credit card required to explore — card collected at checkout.
Everything you need to stay ahead of nexus
Built for e-commerce sellers, accountants, and compliance teams who can't afford a state tax surprise.
Real-time nexus monitoring
Continuous monitoring of your sales volume and transaction counts per state. Know your exposure before the state audits you.
Economic nexus calculator
All 45 states with sales tax, their published revenue thresholds (typically $100K–$500K, varies by state) and transaction count limits where applicable, updated as laws change.
Physical nexus tracker
Log employees, warehouses, inventory, and offices by state. Physical presence triggers nexus regardless of your sales volume.
State threshold alerts
Get notified at 50%, 80%, and 100% of each state's threshold. Email and webhook delivery. Never get surprised by a nexus crossing again.
Registration deadlines
Once you cross nexus, states typically require registration within a set window (varies by state). NexusFlag tracks your deadlines and sends reminder sequences.
Shopify, Amazon, QuickBooks (coming soon)
Platform integrations are in development. Today, upload your transaction data via CSV. Automatic sync via Shopify, Amazon, and QuickBooks OAuth is coming soon.
How it works
Up and running in under 10 minutes. No integrations required on day one.
Upload your sales data
Export a CSV from your Shopify, Amazon, or accounting platform and upload it to NexusFlag. Automatic OAuth sync with Shopify, Amazon, and QuickBooks is coming soon.
We map your exposure
NexusFlag calculates your trailing-12-month revenue and transaction count per state, then compares against each state's published nexus thresholds.
Get alerts before you cross
Receive tiered alerts as you approach thresholds. When you cross, NexusFlag surfaces the registration deadline and a state-specific checklist.
Simple, transparent pricing
All paid plans include a 14-day free trial. Cancel any time.
Starter
For small businesses operating in a handful of states
- ✓Monitor up to 5 states
- ✓Economic nexus threshold tracking
- ✓Email alerts when thresholds are approached
- ✓Shopify & Amazon integrations (coming soon)
- ✓Monthly nexus report
- ✓Email support
Growth
For growing businesses selling across all states
- ✓Monitor all 50 states + DC
- ✓Economic + physical nexus tracking
- ✓Real-time threshold alerts
- ✓Shopify, Amazon, QuickBooks integrations (coming soon)
- ✓Registration deadline reminders
- ✓Weekly nexus report
- ✓State filing calendar
- ✓Priority email support (24h)
Enterprise
For multi-entity companies and agencies managing multiple clients
- ✓Everything in Growth
- ✓Multi-entity support (unlimited entities)
- ✓REST API access
- ✓Webhook event delivery
- ✓Custom threshold rules
- ✓Bulk CSV import
- ✓Dedicated Slack channel
- ✓Custom SLA
- ✓White-label reporting
Enterprise
Multi-entity support, REST API, webhook delivery, white-label reporting, dedicated Slack, custom SLA.