Tax return has doubled and not sure why and how to amend?

Welcome to the Community, @amym2. I'd be delighted to provide you with some insights so you'll be able to make VAT adjustments in QuickBooks Online.

Prior to submitting your VAT return to HMRC, QuickBooks allows you to make adjustments since your tax return has doubled. Your VAT control and/or VAT suspense accounts will be impacted by any manual adjustments you make to your return. I'd recommend consulting your accountant if you're unsure about making an adjustment.

If past returns contain errors, you can amend your current VAT account to fix them if they are:

• below the reporting threshold,
• not deliberate,
• for an accounting period that ended less than 4 years ago.

Otherwise, if you've already submitted your VAT return as filed in QBO but need to make adjustments, I'd suggest reaching out to our QuickBooks Online Support Team for further guidance with the process.

For the detailed step-by-step process on how to make VAT adjustments, feel free to review this article: Make VAT Adjustments in QuickBooks Online.

In addition, I've got this helpful resource for future reference to guide you further about creating exceptions when you make changes to transactions that have already been filed in a VAT return within QuickBooks Online: VAT exceptions and reports in QuickBooks Online.

You can always reply or reach out to us again if you need anything else with VAT or any QBO-related tasks. We're always here to guide and assist whenever you need help. Keep safe always!