Some analysis on the profits and funding costs of banks' credit card portfolios made its way into the report of the Senate Economics References Committee on aspects of this industry niche.ANZ was one bank "willing to share its net profit after tax on its credit card portfolio," the Senate committee noted."ANZ deputy chief executive officer, Graham Hodges, told the committee the bank's credit card business accounted for approximately A$400 million, or five per cent, of group profit."Westpac, while not disclosing its actual profits on its credit card portfolio, "advised the committee that its return on capital for its credit card portfolio had remained stable over the past five years."The RBA provided an overview of revenue across credit card issuers, including: fees, which the RBA estimated at about $1.4 billion in revenue in 2014, or $90 per account; interchange revenues of approximately $1.5 to $1.75 billion in 2014; interest payments, which APRA reported were around $5.4 billion in 2014; and lending losses of about 2.5 per cent.ANZ also stepped up with a stab at a breakdown of industry-wide credit card operating costs, drawing on data provided by Argus Information and Advisory Services:•    Funding costs are about 35 per cent of total credit card operating costs.•    Credit management and fraud comprise around 30 per cent of costs. These costs include credit related losses, consumer protection and protection against fraud.•    Rewards and product benefits are around 27 per cent. These include scheme administration, points reward, discounts and travel insurance.•    Scheme fees are around nine per cent.Once marketing and product development costs, and allowed for, ANZ estimated that funding costs "fell to 'well below 25 per cent of total costs'."