I am self-employed. What should I do if my EFTPS pin number won't be arriving until after July 15th?

Hi there, @wynnbarnard.

If your Electronic Federal Tax Payments System (EFTPS) pin won't arrive until after the due date. You can send your payment and estimated payment form (1040-ES voucher) through the mail. 

Here's how:

1. In QuickBooks Self-Employed, go to the Taxes menu.
2. Select the Quarterly Taxes tab.
3. Click Pay Now.
4. Choose the By mail option.
5. Fill out the 1040-ES payment voucher. Then hit Continue.
6. Print your voucher. This will tell you how to fill out the forms, check, and which IRS office to mail it to.

For more details, see this article: Pay federal estimated quarterly taxes. 

Also, you can visit the EFTPS contact page to pay via phone, or contact their support to check for the other ways you can pay your taxes.

If you have further questions about taxes, please don't hesitate to post a reply below. I'm always right here to help.