Frequently asked questions.

99.5%+ on rooftop lookups, validated continuously against state Department of Revenue source files. Same answer on every plan — Trial through Enterprise share the same premium ZIP+9 geocoder, so a trial user evaluating the API sees production-quality numbers on day one.

The remaining gap is almost entirely rooftop-boundary cases (Census says outside the city polygon; a rooftop geocoder says inside). Real edge cases, not data-quality bugs.

If you can show TaxQL returned an incorrect rate for a specific address, we refund the API calls and investigate within one business day. We also surface the corrected rate in our daily-refresh pipeline so all customers benefit.

Our Terms of Service cap our liability at the fees you paid for the disputed calls — we are a data service, not a tax advisor, and your filing decisions remain your responsibility (see /terms).

Yes. Trial through Enterprise use the same premium ZIP+9 geocoder under the hood — we don't ship a "cheap plan with worse accuracy." A $99 Launch customer gets the same answer as a $999 Pro+ customer for any given address. The only thing that varies by plan is monthly lookup volume and price.

Daily, from the same state Department of Revenue feeds, Streamlined Sales Tax consortium files, and Census polygons everyone in the industry uses. Your call gets the rate that's correct on the day of sale.

We commit to 99.5% monthly uptime on Launch and Business tiers, 99.9% on Pro and Pro+. Service credits apply if we miss the target. See our SLA at /sla for the full commitment, credit mechanics, and exclusions.

You get a grace window of min(24 hours, +10,000 lookups). Past that, a hard 429 with an upgrade-required body.

You are never billed for grace traffic. No flex fees. No silent overage charges. The grace window costs us at most ~$30 per event per customer per month, which is bounded and trivial compared to your subscription fee.

Launch is pay-as-you-grow: $99 buys 2,500 lookups, each additional 2,500 block is another $99 (first paid block per month free). Business is a flat $599/mo for 25,000 lookups — better economics once you're past about your fifth Launch block. We auto-prompt the upgrade at that point.

Yes. You can cancel through the customer portal at any time. Refunds are handled per our payment processor's standard policy — see the /refund page for details.

15% off across all paid tiers when you prepay annually. Up to 20% for strategic accounts (reference customers, multi-year, case-study commitments) — these are negotiated case-by-case and aren't on the public pricing page.

WooCommerce is in active development for launch (largest e-commerce plugin install base). Magento 2 follows. Shopify is on the roadmap but lower priority since Shopify Tax is now built-in. Stripe Tax connector is a longer-term play.

Email [email protected] for early access. We'll onboard you at launch and issue an API key on the customer portal.

The Python SDK and REST endpoints follow standard JSON request/response shapes — a typical migration from another tax API is changing the base URL and the auth header. The 14-day trial period (at launch) covers 1,000 lookups so you can run a full migration replay before committing to a paid tier.

Not yet. Some leading providers bundle state-return filing; we don't. You file with your own preparer or handle it manually. We'll add it when our customers tell us they need it — currently customer conversations are driving roadmap, not assumed feature parity.

No. TaxQL is a hosted API service only. The rate data is freely available from state DoRs (we don't claim copyright there), but the ingest pipeline, polygon overlays, and resolver code are proprietary.

Open-source self-hosted tax data services exist; they require ongoing engineering effort to maintain. If you've decided you'd rather build than buy, we'd love to know why — email [email protected].

Not at v1. TaxQL is U.S.-only — all 50 states + DC. Canadian GST/HST, EU VAT, UK VAT, and other international tax regimes are on the roadmap but not current scope.

If you need international coverage today, leading providers offer broader geographic support; we'd rather maintain depth in U.S. than ship shallow international.