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And I'm sure that's how it was, and is how I've done it in the past, but it wasn't that today. I can't recall the steps but nothing like that was available to me. It may have been because they need a day or two after the return is submitted for the balance to appear but usually on the 'ways to pay' page there's a very clear trail of 'pay online by card' > 'pay now' > enter details. I've used that for years but it seemed broken earlier and just looped.
Sign in to tax portal. View VAT account. Check what you owe. Pay now. Debit card. Enter details.
That’s the flow I followed to pay mine while writing this very post, seemed pretty sensible to me.