We all know that making late payments and maxing out credit cards hurt credit scores, but how much?  The folks at FICO, whose scores are widely used by lenders, have revealed the actual penalties. If your FICO score is 680, a 30 day delinquency drops it by 60-80 points; maxing out a credit card costs 10 to 30 points; a foreclosure costs 85 to 105; and declaring bankruptcy shrinks it by 130 to 150.  If those same missteps are made by the owner of a 780 FICO score with few signs of risky credit behavior in the past, the number of points lost could be about 50 percent higher in each case.