How to zero out VAT balance that is carried forward to the next quarter filing?

Hello, KJ60. 

I can show you a way to adjust and zero out the balances for the previous quarter's VAT amounts. 

You can use a journal entry to adjust and zero out the balances for Box 1 and 4. Simply go to the Company menu and select Make General Journal Entries.

The general idea here is to look for the VAT codes that reflect the amounts for Box 1 and 4. This will definitely affect your books, so I'd recommend consulting with an accountant. They'll know which accounts to use for the credit and debit sides. 

If you still need help adjusting the amounts after consulting an accountant, you can contact our support. Here's how: 

1. Click the Help menu, then choose QuickBooks Desktop Help. 
2. Hit the Contact us button. 
3. Enter "adjust box 1 and 4 amounts from previous quarter" or similar,  and click Continue.
4. Select Talk to a Specialist.

You can also find our contact details here. 

After fixing and adjusting the balances, you're now ready to file VAT for your next quarter. If you need help with this, you can check this article: How to submit a VAT return to HMRC - MTD for QuickBooks Desktop.

You can post other questions here again regarding QuickBooks Desktop. If you have any follow-up concerns regarding the VAT feature, please leave a reply. I'll get back to you as soon as possible.