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.
Trusted by e-commerce businesses across 50 states
Everything you need to stay ahead of nexus
NexusFlag tracks the numbers states use to determine your tax obligations. No guesswork, no spreadsheets.
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.
See every state's exposure in one place
NexusFlag continuously watches your trailing-12-month revenue and transaction counts across all 50 states. The moment you approach a threshold, you're alerted — not after you've already crossed it.
Get alerted at 50%, 80%, and 100% — not after
Most businesses discover nexus exposure during an audit. NexusFlag sends tiered alerts as you progress toward each state's threshold so you have time to consult a professional and register before penalties apply.
This is not tax advice. NexusFlag tracks published state thresholds — consult a CPA or sales tax attorney for your specific situation.
Up and running in under 10 minutes
No complex setup. Upload your sales data and NexusFlag does the rest.
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.
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.
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.
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
Start free. Upgrade when you need more states. No contracts, cancel anytime.
Free
See your nexus exposure in one state — no credit card needed
- 1 state monitoring
- Monthly threshold check
- Email alerts when threshold is approached
- Economic nexus threshold reference
- Manual data entry (no integrations)
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
All paid plans include a 14-day free trial. Cancel anytime — no penalty.
Common questions
Sales tax nexus is complicated enough. NexusFlag should not be.
No. NexusFlag tracks published state nexus thresholds against your sales data and alerts you to potential exposure. It is a monitoring tool, not a tax advisor. For advice on your specific situation, consult a CPA or sales tax attorney.
We monitor state legislative changes and update thresholds within 30 days of any effective date change. You can see the last-updated date for each state in the nexus map. Significant threshold changes trigger in-app notifications to all affected users.
It varies by state. Most states measure gross sales (before refunds and discounts). A handful measure net. NexusFlag applies the correct methodology per state using the most conservative interpretation where there is ambiguity.
Yes. Most states with sales tax have enacted marketplace facilitator laws. Sales through Amazon, Etsy, or other qualifying marketplaces are tracked separately. We distinguish between marketplace-collected and merchant-collected sales so your thresholds are accurate.
Your data is retained for 90 days after cancellation and can be exported anytime. After 90 days it is permanently deleted. Your historical nexus reports remain accessible until the end of the retention period.
Yes, on the Enterprise plan. Each entity gets its own nexus profile, separate threshold tracking, and consolidated reporting. Useful for holding companies, agencies, or businesses that operate under multiple LLCs.
Every month without nexus monitoring is a month closer to a surprise audit.
States have been aggressively enforcing economic nexus since South Dakota v. Wayfair. The IRS is not the only tax authority watching your revenue. Start monitoring today — it takes under 10 minutes.
NexusFlag provides threshold monitoring — not tax advice. It is not a law firm or CPA and does not create a professional relationship. For advice specific to your business situation, consult a licensed tax professional.