How can I mark off historical vat payments still showing a record payment on my tax page when I've already done them as expense transactions from bank?

Hello there, @faganmf.

You have to delete the expense and record the VAT payment in QuickBooks. Let me guide you how.

1. From the left menu, click Expense.
2. Select the Expenses.
3. Choose the expense you want to delete.
4. Under Action, click the drop-down arrow.
5. Click Delete.
6. Hit Yes.

Once done, you can match again as VAT repost on your Banking page. 

I'm here anytime you have other concerns. Have a good day.