Nexura
Track revenue and transactions per US state against Wayfair nexus thresholds, with alerts before you must register.
The problem it solves
Since South Dakota v. Wayfair (2018), you can owe sales tax in a state you've never set foot in. Once your sales cross a state's economic-nexus threshold, usually $100,000 in a rolling 12-month period, sometimes a transaction count, you're legally required to register and collect. Miss it, and you're liable for the uncollected tax plus penalties and interest. Most sellers find out too late, and the compliance SaaS platforms that solve this charge recurring fees inside pricey full-service suites.
- No visibility into how close you are to a state's threshold
- Recurring SaaS fees for a full suite you may not need
- Penalties and interest if you miss the registration deadline
What you get
Rolling 12-month engine
Keeps a correct calendar-window total for every state as you upload sales by CSV or manual entry.
Tiered pre-threshold alerts
Configurable alerts at approaching (50%), warning (75%), and nexus reached (100%) so you register on time instead of scrambling.
OR/AND threshold logic
Handles states that trigger on either revenue or transactions, and the AND-logic states, like New York and Connecticut, that require both.
Editable thresholds, 45 states + DC
Every threshold ships with an explanatory note and can be edited as rules change.
Exposure report + CSV export
Hand your accountant a clean exposure report with estimated trigger dates from a simple run-rate projection.
Installable mobile app (PWA)
Add it to a phone or tablet home screen straight from the browser — a full-screen app served from your own server, with no app store involved. Business data is never cached offline, so what you see is always live.
Own It 2.0 — API, 2FA, backups, dark mode
Nexura 2.0 adds the 2.0 owner layer. Upgrade by replacing the files — the database migrates itself, and it is still the same one-time purchase.
- REST API with an OpenAPI spec and signed webhooks
- Two-factor sign-in (TOTP)
- Email notifications through your own SMTP
- One-click backups
- Dark mode
Own It 3.0 — works for your AI, not just for you
Six MCP tools let an assistant read your exposure, list the register and record sales — each says plainly whether it writes, and roles apply exactly as in the browser. Moving a threshold is admin-only, because editing one changes whether you have a filing obligation.
- Roles with email invitations and a last-admin guard
- Append-only audit trail across browser, API and agent
- Printable PDFs
- Your logo and colours throughout
- Scheduled backups with a guided dry-run restore
- Optional single sign-on (OIDC)
Pricing — one-time, yours forever
- ✔ Full source included — PHP you can read and change
- ✔ No subscription. One payment, yours forever
- ✔ It never phones home
- ✔ Your data stays on your server
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Screenshots
Honest limitations
- Monitors thresholds only — does not calculate, prepare, or file returns
- Threshold data is a convenience starting point and must be verified with a professional
- Trigger-date estimates are simple run-rate projections for planning, not guarantees
- You decide which sales to enter per state (marketplace-facilitated vs. direct, exempt sales, sourcing) — that judgment belongs with your accountant
- Single-tenant: one admin account per installation
Two-minute web installer, PHP 8+ with MySQL or SQLite; seeds all 45 states plus DC on install.
Covered in these guides
Since Wayfair, you can owe sales tax in states you have never set foot in. Compliance SaaS charges recurring fees for tracking it. Here is a self-hosted nexus tracker you own outright.
Frequently asked questions
Is this tax advice?
No, deliberately. Nexura is an alerting dashboard that shows you when you're nearing a threshold so you can act; every threshold is editable and must be verified with a tax professional.
Where does the threshold data come from?
Nexura ships with the well-known post-Wayfair thresholds — the $100,000 standard, the $500,000 states, transaction triggers, and the AND-logic states — each with a note, current as of the build date, and flagged for annual verification.
Will this run on shared hosting?
Yes. PHP 8+ with pdo and mbstring — present on virtually all cPanel/Plesk hosts. The web installer takes about two minutes.
What does it cost to run?
Nothing beyond your hosting. No API keys, no per-state charges, no subscription.
Does it connect live to Shopify, Amazon, or Stripe?
No — you import your sales as a CSV or enter them manually; Nexura does not maintain a live sync to your sales channels.