How can i backdate payroll from jan 1st and jan 15th?

Hello Joeclark, 

Welcome to the Community! It's great to see that you're taking advantage of QuickBooks Online Payroll to manage all of your accounting processes in one place. I can shed some light on backdating your payroll. 

Once a payrun is completed in QuickBooks Online Payroll, the date cannot be edited. In order to change the date, the paycheques of the payrun in question must be deleted and then redone with the correct dates. One thing to note is that this method works for paycheques that were processed as paper cheques, but not if they're direct deposit. You can find the steps on how to delete paycheques in this article: How to delete a pay cheque.

For paycheques that were processed as direct deposit, you'll need to reach out to our support team outside of the Community. That way, they can privately collect your account information and make the corrections on our end for you. Here's how you can get in touch with them:

Phone: Call 1-855-253-1536 from Monday to Friday from 9 a.m. to 8 p.m. EST.
Schedule a Callback or Chat: Click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat. Support is available from Monday to Friday between 9 a.m. and 8 p.m. ET.
Social Media: Facebook, Twitter, and Instagram.

Please let me know if you have any other questions or concerns!