Q2 VAT has balance of "-3124.26" Q3 VAT should be 12,139.42 - 3124.26 = 9015.16 but the -3124.26 is not moving to Q3 what should I do?

I appreciate your time reaching out to us here, tamimi.

You'll want to run the VAT Detail report to see if there are any adjustments from the previous quarter. Use the data on the report to compare the information in the current quarter.

Here's how:

1. Go to Reports on the left panel.
2. Type VAT Detail n the Search field.
3. Select the Report period and click the Run report button. 

If you need to adjust the balance, I recommend reaching out to our Customer Care Team. They can pull up your account and check the figures to make sure you have the accurate data.

Here are the steps:

1. Click the Help icon located in the upper right-hand corner.
2. In the Help window, click the Contact Us button located at the bottom.
3. Enter your question and click Let's talk.
4. Choose either Start a chat or Call us.

If you have the new QuickBooks Assistant help update, you can follow these steps:

1. Go to the Help menu, and select Talk to a human.
2. Choose Talk to a human again. 
3. Proceed with I still need a human.
4. Click the Contact us link.
5. Select either Start messaging or Get a call.

Should you have any additional questions or concerns with QuickBooks Online, please let me know in the comments below. Thanks.