Good point, themas. I suppose that if it were a debit card, where each transaction is instantly debited to the account and it was on a joint account, rather than a credit card, each party to the joint account would be 'jointly and severally liable'. Can't see any reason why debit cards wouldn't be issued for joint accounts and on those terms, but you are surely right about credit cards; none of my visa or Amex cards makes anyone other than me, as the principal card holder, liable. My partner and daughter aren't liable.