meta_query dates from an array

If you store the meta as a serialized array, you should do meta query like this:

$args = array(
    'post_type' => 'income',
    'meta_query' => array( 
        array(
            'key' => 'income_dates',
            'value' => "2014-02-01",
            'compare' => 'LIKE'
        ),
    )
);