Banks do not need to pay stamp tax when issuing letters of guarantee, letters of credit, etc., because they do not fall within the scope of stamp tax. Loans are taxed on loan contracts.

Supplement: What is stamp duty

Stamp duty is a tax levied on the act of writing and receiving legally valid certificates in economic activities and economic transactions. It got its name from the fact that tax stamps are affixed to taxable certificates as a sign of tax payment.