How can i enter old invoice to claim vat back?

Hello there, skatira,

You can add the transactions as per usual. You'll be prompted that you've already filed the VAT return but you'll be able to push through on adding it.

You'll want to add the reclaimed VAT in Box 4 of your return per HMRC's instruction. Here's how:

1. Go Taxes and click on Prepare return.
2. Click the Adjust option next to the Box 4 amount.
3. Enter the Adjustment amount.
4. Add a memo about the adjustment.
5. Click Save.

Check out these articles for your reference in the future:

• VAT: Getting Started
• Submit a VAT return in QuickBooks Online

If you have additional questions about taxes in QuickBooks, don't hesitate to leave a reply.