(Reuters) - Big U.S. banks had enough capital to weather a potentially severe economic downturn but some of their risky businesses could hypothetically take a major hit this year, according to results of the Federal Reserve's annual stress test.

The 31 banks that participated showed they could withstand a spike in joblessness and stresses in the commercial real estate market and still have enough capital available to lend.

Their common equity tier 1 (CET1) ratio, a metric that gauges high-quality capital, will dip to 9.9% at its lowest, still far ahead of the 4.5% minimum requirement.

Here is how some of the biggest U.S. banks fared in the test:

Bank Minimum

common equity tier 1

(CET1) ratio

JPMorgan Chase ( JPM ) 12.5%

Bank of America ( BAC ) 9.1%

Wells Fargo 8.1%

Citigroup ( C/PN ) 9.7%

Goldman Sachs ( GS ) 8.5%

Morgan Stanley ( MS ) 10.6%

The Fed also projected losses on loans could reach up to $571 billion under its severely adverse scenario. Credit card loans could be tricky, the central bank said.

The corporate credit portfolios of banks have also shifted towards riskier loans. They now hold a larger share of non-investment grade corporate credit, which are over three times more likely to default than investment grade ones, the Fed said.

Here are the banks with the steepest potential loan losses, according to the central bank:

COMMERCIAL AND INDUSTRIAL LOANS -

Bank

Projected losses

(as % of average

loan balances)

Discover Financial 21.8%

Barclays US 19.3%

Goldman Sachs ( GS ) 16.2%

CREDIT CARDS -

Bank

Projected losses (as

% of average loan

balances)

Ally Financial ( ALLY ) 40.6%

Goldman Sachs ( GS ) 25.4%

Capital One 23.2%

COMMERCIAL REAL ESTATE LOANS -

Bank Projected loan

losses (as % of average

loan balances)

Goldman Sachs ( GS ) 15.9%

Royal Bank of Canada USA 15.8%

Capital One 14.6%

(Reporting by Niket Nishant in Bengaluru; Editing by Devika Syamnath)