KUALA LUMPUR, Nov 23 (Reuters) - Malaysia has maintained its December export tax for crude palm oil at 8% and raised its reference price, a circular on the Malaysian Palm Oil Board website showed on Thursday.

The world's second largest palm exporter calculated a reference price of 3,589.09 ringgit ($767.23) per metric ton for December. The November reference price was 3,556.08 ringgit a ton.

The export tax structure starts at 3% for crude palm oil in a 2,250 to 2,400 ringgit-per-ton range. The maximum tax rate is set at 8% when prices exceed 3,450 ringgit a ton. ($1 = 4.6780 ringgit) (Reporting by Danial Azhar; Editing by Martin Petty)