The Specifically Selected Goods and Services Tax Act Article 21

When a taxpayer fails to pay the tax within the prescribed time limit, a 1% belated surcharge shall be imposed on the belated payment for every 2 days in arrears, starting from the day following the expiration of the time limit. If payment is not made more than 30 days after the time limit, the competent tax authority may refer the case for compulsory execution procedures.The amount of tax payable under the preceding paragraph shall be subject to interest charges for the period from the date of expiration of the time limit for late payment to the date the taxpayer makes payment or the tax is collected through compulsory execution. The interest shall be calculated per diem at the one-year time deposit rate for postal fixed savings set on January 1 of that year.