What is a mortgage underwriter looking for when they look over my credit card statements? Are they mostly interested in whether or not I clear my balance each month or are they likely to comment on the amount I spend? I recently had a lot of expected costs, way above my typical monthly costs and income, due to moving house and having to pay for a lot of one off services and replacement items. I used my credit cards to pay for these but I always paid them off each month from my savings, i.e. no interest charges. Might this still be an issue?