The credit scores of millions more Americans are sinking to new lows.

Data published by FICO show that 25.5% of consumers — nearly 43.4 million people — now have a credit score of 599 or below, marking them as poor risks for lenders. It’s unlikely they will be able to get credit cards, auto loans or mortgages under the tighter lending standards banks now use.  Because consumers relied so heavily on debt to fuel their spending in recent years, their restricted access to credit is one reason for the slow economic recovery. This includes credit for large ticket items like a mortgage, car loan or refinance car loan.

FICO’s latest analysis is based on consumer credit reports as of April. Its findings represent an increase of about 2.4 million people in the lowest credit score categories in the past two years. Before the Great Recession, scores on FICO’s 300-to-850 scale weren’t as volatile. Historically, just 15% of the 170 million consumers with active credit accounts, or 25.5 million people, fell below 599, according to data posted on Myfico.com.

More are likely to join their ranks. It can take several months before payment missteps actually drive down a credit score. The Labor Department says about 26 million people are out of work or underemployed, and millions more face foreclosure, which alone can chop 150 points off an individual’s score. Once the damage is done, it could be years before this group can restore their scores, even if they had strong credit histories in the past.

On the positive side, the number of consumers who have a top score of 800 or above has increased in recent years. At least in part, this reflects that more individuals have cut spending and paid down debt in response to the recession. Their ranks now stand at 17.9%, which is notably above the historical average of 13%, though down from 18.7% in April 2008 before the market meltdown.

There’s also been a notable shift in the important range of people with moderate credit, those with scores between 650 and 699. The new data shows that this group comprised 11.9% of scores. This is down only marginally from 12% in 2008, but reflects a drop of roughly 5.3 million people from its historical average of 15%.

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