Amanda Bynes' suspended license finally caught up with her today -- TMZ has learned she was pulled over by police and had her car impounded. 

Law enforcement sources tell TMZ ... Bynes was pulled over in her black BMW around 9:00 AM in Burbank, CA. We're told when cops ran her license they discovered it was suspended.

According to our sources, cops impounded the vehicle and issued her a misdemeanor ticket for driving on a suspended license.

As TMZ first reported, Bynes was pulled over on September 9 -- but despite having the suspended license, she was given only a verbal warning and let go.

She was not as lucky this time.