Originally Posted by
PanGalactic
Why would you not use the BMI MC or Tesco one instead?
Are you hoping you will be able to put more than 10K spend on the Lloyds Amex at 2x and make up for it?

I effectively get 22.7 miles per £1 for the tax payment, that's why!
I knew I had this bill to pay in July. I therefore charged £10k in dollars to my card in May when I was on 10x, paid the statement off, refunded the payment last week (presumably losing 2.5 avios per £1) and then used the £10k to pay my tax on the MC (earning back 0.2 miles per £1).