You'd like to submit the appropriate tax forms to Heroku in order to not be charged taxes on your monthly invoice.
In an effort to become tax compliant, Heroku will be charging taxes on invoices to customers in certain states on August 1, 2019. Some customers may be tax exempt and should not pay these taxes.
Customers who are tax exempt must submit a copy of their State Tax Exemption Certificate in a ticket to Heroku Support under the Billing category. If your Tax Exemption certificate does not include a Certificate Number or your Federal EIN/TIN, please also submit a copy of your Federal EIN/TIN documentation.