BANGKOK, Jan 17 (Reuters) - Thailand's cabinet on Tuesday agreed to extend an excise tax cut on diesel for another four months to May 20 due to high energy prices and to alleviate costs of living, Deputy Finance Minister Santi Promphat said.

The tax cut of 5 baht per litre will lead to a loss in revenue of no more than 40 billion baht ($1.21 billion), he said. ($1 = 33.0500 baht) (Reporting by Satawasin Staporncharnchai, Writing by Chayut Setboonsarng; Editing by Kanupriya Kapoor)