Funding costs are rising and the markets periodically shut down. But regulators want you to raise more and to hold more short-term liquidity that you can’t reinvest at a profit. You don’t know how regulators will classify your risk assets or how much capital they will require you to hold. But it will be more than you have. Raising it will cost more than you can earn as a return on it. Fancy a challenge? Become a CFO. Peter Lee reports.