I have imported product. I have paid my supplier ahead of my VAT liability. How do I record the separate VAT payment?

Thanks for joining the Community, @JaneC13.

I'd be happy to help share some insights about paying VAT.

You can record the separate VAT payment same as the normal VAT payment process in QuickBooks. 

Here's how: 

1. Go to Taxes and click on Record Payment for the specific VAT period you need.
2. At the top, select the bank account you've used to pay HMRC.
3. Make sure you've selected Payment under Payment Type.
4. Enter the Payment date and amount.
5. Add a memo if needed.
6. Click Save.

That should do it. For other articles related to VAT that you can use in the future, you can check this link: VAT for QuickBooks Online.

Keep me posted if you have other questions about VAT payment. I'm here to help.