Annual vacation pay error: 4% paid instead of 6% for multiple pay periods

It's good to have you here, @nadeaustephanie.

I want to help you add the reimbursement on the employee's paycheque for the wrong vacation pay.

If you have Standard Payroll, you can simply add "Reimbursement" item as an additional pay type for the employee. Once done, fill out the Reimbursement field when you run their payroll. Here's how to do that:
 

1. Go to the Employees tab on the left navigation menu. 
2. Tap to edit one of your employees. 
3. Click the small Pencil icon next to Pay.
4. Next to "How do you pay this employee?" click the small Pencil icon. 
5. Check off the box next to Reimbursement. Note: Click the small drop-down menu next to Reimbursement to see a chart explaining how this pay type is taxed. The reimbursement pay type is non-taxable.
6.  Press Done.

When you click Run Payroll, you'll see a box for Reimbursement, where you can enter the amount. 

For Advanced Payroll, set up an income type called "Expense Reimbursement". This pay type is non-taxable, non-pensionable, and non-insurable. For more information about this pay type and how to set this up in Advanced Payroll, take a look here: QuickBooks Online Advanced Payroll - Pay & tax settings.

Let me know if this helps you get back on track. For other payroll questions, please feel free to reach out to back to me.