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Use the contact form above, select "Tax Rate Error / Correction" as the topic, and include the jurisdiction name, the rate currently shown, and ideally a link to the official government publication confirming the correct rate. Our data team will verify and update within 3 business days.

Yes. We offer a free embeddable widget for non-commercial use. Visit the main calculator page and scroll to the "Free Embeddable Widget" section for the iframe snippet and instructions. For commercial or white-label licensing, contact us via this form.

US state sales tax rates are reviewed monthly and updated whenever a state issues a legislative change. Global VAT / GST rates are reviewed quarterly. All data is cross-referenced against official government publications before being published.

We are currently developing a public JSON API for programmatic access to our rate database. If you have an immediate integration need, contact us with details of your use case and we will see if we can assist ahead of the public launch.

Completely. All calculations are performed entirely in your browser using client-side JavaScript. No values you enter are transmitted to our servers, logged, or stored in any form. Please see our Privacy Policy for full details.

We aim to send an initial response within 24 hours on business days (Monday–Friday, UTC+0). During peak periods or for complex data audit requests, it may take up to 3 business days for a full resolution.