Billing, Cancellation & Refund Policy

Last updated: October 15, 2026

This policy explains how Tang Math memberships are billed, renewed, changed, cancelled and refunded. It is part of our Terms of Use. "We", "us" and "our" mean Tang Math LLC.

1. What this policy covers

This policy covers Families and Classroom memberships bought online at tangmath.com with a card. School and district purchases made through a quote and purchase order are covered by section 11 and by the terms on the quote and invoice.

2. Plans and prices

Families

• One Child: $24.99 per month, or $249.99 per year. Includes one student.
• Up to 10 Children: $29.99 per month, or $299.99 per year. Includes up to 10 students.

Classroom

• $299.99 per year for one classroom, including 10 students.
• Additional students are $29.99 each per year, up to 30 students in total for a card purchase. Larger classrooms, more than one classroom, and purchase orders go through a quote.

Prices are in US dollars. Sales tax is added where it applies and is shown at checkout before you pay. Your parent or teacher account is always included.

3. Families free trial

Every Families plan starts with a 7-day free trial. Classroom memberships don't include a trial.

• The trial is once per family. If you have had a Tang Math membership before, your new one starts without a trial.
• We take your card at checkout but charge nothing during the trial. Checkout shows the exact date your trial ends and the amount you will be charged.
• The trial ends 7 days after you check out. Unless you cancel before then, the price of your plan plus any sales tax is charged on that date, and then every month or year, as you chose, until you cancel.
• We email you a reminder 3 days before your trial ends, with the date and the amount.
• To avoid being charged, cancel before the trial ends from Manage billing in your family home. You keep access until the trial ends.
• You can switch plans or billing periods during the trial. Your trial end date stays the same, and you are charged for the plan you are on when it ends.

4. Automatic renewal

Memberships are subscriptions. They renew automatically at the end of each billing period — every month for monthly plans and every year for annual plans — and are charged to the payment method on file, until you cancel.

Before an annual membership renews, we email you a reminder with the renewal date and amount, so you have time to cancel if you no longer want it.

5. Cancelling

You can cancel at any time, online, with no cancellation fee:

• Families: in your family home, open Manage billing and cancel your plan there.
• Teachers: in Account Settings, open Manage Subscription and cancel your plan there.
• Or email contact@tangmath.com from the email address on your account and we will cancel it for you.

Cancelling stops future renewals. You keep full access until the end of the period you have already paid for, and are not charged again. Apart from the 30-day guarantee below, we do not give partial refunds for the unused part of a period.

6. 30-day money-back guarantee

If Tang Math isn't right for you, you can ask for a full refund within 30 days of the first payment for a new membership, whether monthly or annual. For a Families plan with a free trial, the first payment is the one made when the trial ends.

• Email contact@tangmath.com from the email address on your account within 30 days of that first payment.
• We refund the amount you actually paid, including tax, to the original payment method. Banks usually show it within 5 to 10 business days.
• The membership ends when the refund is issued.
• The guarantee applies once per family or teacher. It doesn't apply to renewals, to charges for plan changes or added students, or to school and district purchases (see section 11).

Outside the guarantee, payments are non-refundable except where the law requires a refund. We may still consider a refund in unusual circumstances, at our discretion.

7. Changing plans

Families

You can switch between One Child and Up to 10 Children, or between monthly and annual billing, at any time from Manage billing.

• Upgrades take effect right away. You are charged the difference for the rest of the current period, and your student limit goes up immediately.
• Downgrades also take effect right away. The unused difference is kept as a credit on your account and used toward your next payments. Students you have already added stay on your account, but you can't add more than your new plan allows.

Classroom

To add students to a Classroom membership, email contact@tangmath.com. Added students are charged for the rest of your current year and renew with your membership.

8. Failed payments

If a payment doesn't go through, we retry it automatically over about two weeks and email you so you can update your card. Your access continues during that time.

If the payment still can't be collected, the membership is cancelled and access to paid features ends. Your account, students and their progress are kept, subject to our Privacy Policy, and are there again if you subscribe again.

9. Promotion and affiliate codes

• Codes are entered at checkout and can't be added to a purchase after it is made.
• One code per membership. Codes have no cash value and can't be exchanged or combined.
• A code's discount applies only to the plans and billing periods stated with it, and may be limited to the first payment or first months of a membership.
• Codes may expire or be withdrawn. We may cancel a discount obtained by misuse of a code.

10. Taxes

Sales tax is calculated at checkout from your billing address. Card purchases made by individuals are generally not tax-exempt. If your school or district is tax-exempt, please request a quote and send your exemption certificate with your purchase order.

11. School and district purchases

Purchases made through a quote and purchase order are invoiced. Payment terms, start dates, and any cancellation or refund terms are those stated on your quote and invoice. Unless the quote says otherwise, invoices are due within 30 days.

12. Price changes

We may change our prices. A change never affects a period you have already paid for. We will email you at least 30 days before a new price applies to your membership, so you can cancel before it takes effect.

13. Disputed charges

If you don't recognize a charge or think it is wrong, please contact us first — we can usually fix it quickly. While a charge is disputed with your bank, we may pause access to the membership it paid for.

14. Contact us

Questions about billing: contact@tangmath.com, or Tang Math LLC, PO Box 777850, Henderson, NV 89077.