US regulators are seeking input from banks to see how hard they will be hit by new accounting rules, which will see them bring back more than $1 trillion (£619bn) of assets onto their books. The Federal Deposit Insurance Corp proposed earlier this week to seek input from the banks to see if they need more time to build up their capital against any assets that were once held by off-balance sheet trusts, Reuters reports. 'I think it's very appropriate that we're asking the question: should we phase this in over time or not,' said John Dugan, comptroller of the currency. 'Some type of transactions may require a different type of capital treatment than others.' In light of the financial crisis, debate has raged over whether banks should be forced to move their assets back onto their books, in a bid to bring more transparency to the table. They have used off-balance sheet vehicles to avoid reporting requirements or to reduce the amount of capital they needed to hold to offset any risks. Those who regulate the banks have concerns over how these capital requirements would work with the accounting change. Chairman of the FDIC Sheila Bair said regulators needed more information as to how the accounting rule changes could affect securitisation markets and loan modifications, as bringing back trillions of dollars in assets and liabilities onto banks' balance sheets could have a weighty impact on how they operate.