4. Foreigner who wishes to extend his or her stay shall submit a request for extension of stay at the Office of the Immigration Bureau with documented evidence of money transfer or a deposit account in Thailand or an income certificate showing an amount of not less than 800,000 Baht or an income certificate plus a deposit account showing a total amount of not less than 800,000 Baht. A one-year extension of stay shall be granted at the discretion of the immigration officer to the foreigner as long as he or she meets the above requirements.