Newly cast leverage ratio rules adopted by US regulators yesterday are set to make it more difficult for the biggest US banks to go back to their old pre-crisis borrowing ways. The measure centers on something known as a supplementary leverage ratio. In basic terms, a leverage ratio is the amount of debt that a company carries on its balance sheet relative to the amount of total assets it owns.


Newly cast leverage ratio rules adopted by US regulators yesterday are set to make it more difficult for the biggest US banks to go back to their old pre-crisis borrowing ways. The measure centers on something known as a supplementary leverage ratio. In basic terms, a leverage ratio is the amount of debt that a company carries on its balance sheet relative to the amount of total assets it owns.
The new supplementary leverage ratio rule being adopted, as a function of the Dodd-Frank financial overhaul passed in 2010, forces the largest US financial institutions to retain more equity on their books to support the total assets. That’s regardless of the quality of the asset the bank is holding, according to the new rule. So if a bank owns cash or extremely high-quality US government debt, like Treasurys, the financial institution must either retain a certain percentage of its own equity in support of that holding or right-size its holdings of assets to match its equity. (Equity is an important cushion of the banks own money that helps absorb losses on investments in assets like securities and loans.)
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When this rule was proposed last year in July, the matter of quality of the asset was a big point of contention between regulators and banks, who argued that higher quality holdings should be excluded from the leverage ratio rule. Regulators apparently don’t agree. Apparently they remember how many subprime mortgage bonds in the US were considered just as safe as US Treasurys—holding the same AAA bond rating—before the crisis hit and the market quickly changed its mind on how risky these packages of home loans really were. Anyway, here’s the run down of whom the new rule affects: