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Chart: Why Basel III Matters

This is slightly esoteric, but nevertheless extremely important for bank investors to understand.

At the end of 2010, the Basel Committee on Banking Supervision, an international consortium of banking regulators, finalized an updated set of guidelines for determining how much capital banks should be required to hold relative to the size of their balance sheets.

Prior to the updated regulatory scheme, the largest banks in the United States were obligated to maintain a Tier 1 common capital ratio of 5% (relative to risk-weighted assets) under the Federal Reserve's Comprehensive Capital Analysis and Review, or "CCAR" -- the formal process used by the central bank to ensure that large bank holding companies have adequate capital and capital-management procedures in place.

Under Basel III, this minimum requirement increases dramatically. When fully phased in, Basel III requires bank holding companies to maintain a minimum ratio of Tier 1 common capital to risk-weighted assets of at least 7%, consisting of a minimum ratio of 4.5% plus a 2.5% "capital conservation buffer." In addition, the Basel Committee has proposed a surcharge for systematically important financial institutions -- i.e., too big to fail -- of between 1% and 3.5%, depending on the nature of the underlying operation.

Here's how the latter so-called "SIFI buffer" plays out for the largest U.S. banks:

Bank Holding Company

SIFI Buffer

Tier 1 Capital Requirement

Citigroup (NYSE: C  )



JPMorgan Chase (NYSE: JPM  )



Bank of America (NYSE: BAC  )



Bank of New York Mellon



Goldman Sachs (NYSE: GS  )



Morgan Stanley



State Street



Wells Fargo (NYSE: WFC  )



Source: Financial Stability Board's "Update of group of global systematically important banks."

As you can see, while global banks like Citigroup and JPMorgan were previously obligated to hold 5% in Tier 1 common capital relative to risk-weighted assets, they must now hold 9.5%, or nearly twice the previous amount. And even primarily domestic operations like B of A and Wells Fargo see their rates ratchet up by 1.5% and 1%, respectively. To make matters worse (at least from a bank's perspective) the Basel Committee made the risk-weighting of assets a more exclusive process. The net effect is to increase the denominator in the capital equation, which puts downward pressure on the quotient -- that is, the ratio itself. Taken together, banks will be much more limited in terms of leverage going forward.

To make this easier to visualize, I created the following chart, which compares how much Tier 1 common capital B of A is obligated to hold under the current rules relative to how much it holds under the Basel III guidelines.

Source: Bank of America's 2012 10-K, page 73.

Under the current regulatory scheme, known as "Basel I," the nation's second largest bank by assets is obligated to hold a minimum of $60 billion in Tier 1 common capital -- this largely consists of common stock and retained earnings. As a result, B of A currently holds $73 billion more than is required. Under the new scheme, however, it's required to hold $118 billion in Tier 1 common capital, leaving the bank with only $10 billion in excess reserves.

While this may seem academic, think about that for a second. We're talking about a nearly twofold increase in capital, amounting to a staggering $58 billion. That's a little over $5 a share for a bank that trades at roughly $12 a share today. In one fell swoop, moreover, B of A's $73 billion capital cushion gets eviscerated, cut down to a comparatively paltry $10 billion.

Making our way to the income statement, in turn, the impact will be to materially drive down the return of equity at the nation's largest banks -- as banks are nothing more than leveraged investment funds, albeit highly regulated ones. So what does this mean for your investment in B of A, or any other bank for that matter? While the answer to this question is beyond the purview of this article, two of the Motley Fool's top banking analysts address it in this in-depth report on B of A.

To claim your own copy of this valuable report, simply click here now.

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