Email us at contact@tariffcostcalc.com. Have a question about a calculator, need to report a formula issue, or found an outdated customs rule? Send a message using the form below. TariffCostCalc.com provides educational calculators, not customs brokerage, tax advice or legal representation.
Send a message
Updated November 14, 2026. For questions about this page, email contact@tariffcostcalc.com.
What we can help you with
You can contact TariffCostCalc.com about a calculator that produces an unexpected result, an unclear field label, a missing explanation, or a source that appears outdated. We also welcome suggestions for specific cross-border cost questions that a transparent calculator could usefully address.
For customs-law questions, please remember that we do not provide binding classification rulings, legal representation, tax advice, or customs brokerage. We can review a reported site issue and point to authoritative resources, but we cannot certify the duty on your particular consignment.
How to describe a formula issue
Start with the URL of the calculator page, then list the field values you entered and the result you saw. Include the result you expected and how you calculated it. For example, if a volumetric-weight tool uses a carrier divisor that differs from your service contract, name the correct divisor and the source.
If a customs rule appears outdated, include the official government notice, legal article, effective date and the paragraph you think needs updating. This helps distinguish a calculation defect from a different tariff classification, entry type or jurisdiction.
Protect confidential information
Do not attach bank statements, payment-card information, passwords, identification numbers, customs login credentials, sensitive invoices, or private account access details. The contact form collects only the information you type into its name, email, subject and message fields.
The calculator’s share-link feature may put entered numbers into a URL. Avoid sending sensitive commercial figures through share links unless you are comfortable with the recipient seeing them. Our Privacy Policy explains relevant handling of messages and technical information.
Contact details and message delivery
Email contact@tariffcostcalc.com or use the form above. The contact form is configured to send notifications to that address, subject to your mail service and domain configuration. We do not promise a fixed response deadline.
For urgent import clearance, detained shipments, customs penalties or regulatory deadlines, contact your customs broker or the appropriate customs authority directly. A general educational site is not an emergency clearance channel.
Frequently asked questions
Can you tell me the exact tariff rate for my shipment?
Not without product-specific classification and relevant official details. We do not issue official customs determinations.
Do I need to send a copy of my invoice?
No. Please avoid uploading confidential invoices or identifying documents to report a normal calculation concern.
Help us verify a calculation
For a calculation issue, share the page URL, which destination or country pair you selected, relevant numbers, and what result you expected. For a trade-rule correction, include a link to the official customs authority or legal source and its effective date.
Please do not send passwords, bank account details, credit card numbers, identification numbers, customs entry credentials, or confidential commercial invoices. Contact submissions are used to read and respond to inquiries. See our Privacy Policy and Disclaimer.