When setting up the tax setup who's "SIN: Owner 1, and SIN: Owner 2"?

Hi jessebrianfoster,

Welcome to Community!  It's great to hear that you're getting started with QuickBooks Online Payroll for paying your staff with confidence.  I'll be happy to provide the information you need so you're on the right track with setting it up.

When entering the required elements for Federal Taxes, the SIN number is optional.  The required fields would be the Payroll number, RP, the transmitter number and the frequency.  Here's a QuickBooks Online Payroll help article for your reference.

Feel free to reach out with any other questions.  We'd love to help!