i have put a to larger figure in box 7 of my vat return how do i change it

You'll have to make a VAT adjustment, C.E.RODWAY.

Before doing so, please note that any changes to your return will impact your VAT control and/or VAT suspense account. We recommend consulting an accountant prior to making any adjustments to understand the process.

To adjust VAT in QuickBooks, remember the following:

• You can adjust your current VAT account to correct errors on past returns with a VAT account adjustment if they're below the reporting threshold, not deliberate, and less than 4 years old.
• You must report any errors that do not meet the above conditions to HMRC.
• When you submit your next return, make sure you add the net value to Box 1 for tax due to HMRC, or to Box 4 for tax owed to you.
• Keep details about any inaccuracies on your return. For example, the date it was discovered, how it happened, the amount of VAT involved, and so on.
• Any inaccuracies must be accounted for in your VAT account.

Whenever you're ready, perform these steps:

1. Go to Taxes, and select VAT.
2. Select Prepare return for the period you are submitting for.
3. Next to the VAT line that you want to change, select Adjust. 
4. In the Adjustment amount section, enter the amount of the adjustment.
5. Enter a Reason for adjustment to describe the adjustment. It's good practice to include this, since it will help identify the adjustment.
6. Click Save. 

After that, QuickBooks creates a journal entry to record the adjustment, which will appear on your next VAT return submitted to HMRC. The adjustment amount will be reflected in the box corresponding to your modification.

On top of that, adjusting box 7 will result in a debit and credit to your VAT suspense account. This will use the default VAT code of Exempt (Purchases) and will only affect the net value of purchases.

If you wish to know more about the effects of making adjustments, specially after submitting your return, please see this article: Make VAT adjustments in QuickBooks.

You may also find this article handy if you want to record, adjust and delete VAT payments in the tax centre: Manage VAT payments in QuickBooks Online.

If there's anything else you need help with, let us know by adding a comment below.