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$dbh=$db->prepare("SELECT -balance FROM Table1 
                   WHERE  username='$authuser' 
                          and balance < '-.01'");
$dbh->execute();
($balance_due) = $dbh->fetchrow_array();

$dbh=$db->prepare("SELECT -balance FROM Table1 
                   WHERE  username='$authuser' 
...
$dbh->execute();
($tmp) = $dbh->fetchrow_array();
$balance_due = 0 - $tmp;

$dbh=$db->prepare("SELECT -balance FROM Table1 
                   WHERE  username='$authuser' 
...
$dbh->execute();
($tmp) = $dbh->fetchrow_array();
$balance_due = substr $tmp, 1;