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Nonprofit Pricing

thanks.io offers discounted postage rates for qualifying nonprofit organizations. Nonprofit rates can significantly reduce the cost of donor acknowledgment letters, fundraising appeals, and stewardship mailings.

Current nonprofit rates at thanks.io/pricing.

Who qualifies​

Registered 501(c)(3) organizations (US) or equivalent nonprofit designations in other countries. Contact support to confirm eligibility for non-US organizations.

How to apply​

  1. Email support@thanks.io to find out more and see if you're eligible.
  2. Have your USPS Nonprofit Authorization Number ready — that's the number you receive once approved for nonprofit mailing rates.

Domestic mail only. Nonprofit postage. Not for multi-page letters.

What is a Nonprofit Authorization Number?​

  • It's the special number the USPS assigns to eligible nonprofits that lets them mail at lower postage rates, called Nonprofit USPS Marketing Mail rates.
  • Fill out USPS Form 3624 (no fee) and include proof of eligibility (such as an IRS determination letter). Applications are typically reviewed within 5–10 business days when submitted online.
  • Once approved, you receive a nationwide authorization number usable at any USPS location that accepts presorted mail.

Tips​

  • Nonprofit rates apply to the postage component; the plan subscription fee is not discounted.
  • Contact support early — verification may take a few business days.