Kindly be informed that the Automatic Teller Machines (ATM) of Bank of Bhutan can now be used by holders of MasterCard (both credit or debit) to withdraw local currency (Ngultrum). Maximum of Nu. 18,000.00 can be withdrawn per usage and there is no limitation on transaction per day (except the limitation given by the Master Card issuance agency). There will be a charge of USD 2.50 – USD 3.00 per usage.This is good news for tourists and other credit-card holders, especially if they need local currency during non-banking hours.
I haven't found any mention about this on the BOB website, so hopefully the information is correct.