Welcome to the Community, @may_pearlpt. 

Yes, I'm here to help you with correcting this error. It's good to hear that you've already updated your employee's pay rate for the next payroll. 

Giving the employee the difference of their pay from the last paycheck will depend if the employee was overpaid or underpaid. Also, the tax tracking type you've used will matter on how this affects your taxes.

If the employee has been overpaid from the last paycheck using the previous rate ($11.50), let's first set up a deduction item. This way, you can add it to the next payroll. Here's how: 

1. Go to Lists from the top menu and select Payroll Item List.
2. Select the Payroll Item button and click New.
3. Choose Custom Setup and click Next.
4. Select Deduction and click Next.
5. Enter the name of the payroll item and click Next.
6. In the liability account field, enter the same expense account that was used for the original compensation item with which the employee was overpaid.
7. Select Compensation as the tax tracking type. If you choose None, this won't affect taxes as it is being deducted from the net pay. Click Next.
8. Select Calculate this item based on Quantity if the employee was paid hourly. Choose Neither if the employee was paid with a salary item.
9. Click Finish. 

Then, add the new deduction item to the next paycheck for the overpaid employee. Then, enter the overpayment amount, hours, and click Save.  For detailed instructions, check out this article: Reduce Wages.

If the employee has been underpaid from the last paycheck using the previous rate, set up an "addition" payroll item type instead. This way, you can add the difference to the next payroll.

Once resolved, I recommend running and customizing any payroll reports in the program. Doing this will help you manage your payroll and keep track of employee expenses. 

Click the Reply button below if you have follow-up payroll concerns or other inquiries. I'll gladly help. Keep safe.