Employee cant open invite to fill out w4 tax form and i cant get him on payroll until he fills it out

One potential cause is an older version of the browser your employee is using, @lawn22. Let's work on this together to figure things out and fix this.

To start with, does your employee encounter an error prompt when opening the form? This way, we can figure out things preventing your employees from filling out the forms.

Following that, we can let your employees check for the supported browsers. This can be the cause of why they can't open the link.

Here are the browsers supported on both web and mobile devices:

• Google Chrome: version 78 or newer
• Mozilla Firefox: version 76 or newer. 
• Microsoft Edge: version 79 or newer
• Safari: version 12 or newer (Mac only)
• Opera: version 68 or newer
• Samsung: version 10 or newer

After following the abovementioned, you'll have to re-send an invitation. That way, your employee can fill out the form once again.

Additionally, you'll want to check this article and learn how to enter and give mileage reimbursements to your employees: Reimburse employees' mileage and vehicle expenses in QuickBooks Online.

I'll be available in the comments to circle back if you need additional assistance managing your payroll forms in QBO. Have a good one.