Contact

Use the channels below for feedback and corrections. We review all messages related to tax-rate accuracy, broken links, and guide quality.

General Inquiries

Email: support@gst-hst-calculator.sundry-know.com

Rate Correction Requests

If you believe a provincial rate or rule is outdated, include:

• Province or territory
• Transaction type (goods, services, digital supply, etc.)
• Reference source URL
• Date when the source was updated

Partnerships and Media

For collaborations, educational licensing, or media requests: partners@gst-hst-calculator.sundry-know.com

Response Time

We usually respond within 2 business days. High-priority rate corrections are reviewed first to keep calculator outputs reliable.

Before contacting us, you can verify the latest provincial rules in our 2026 tax rates reference guide.