Data on monthly and annual base interest rate are published on the basis of Article 3 of the Legal Penalty Rate Act (OJ RS, No. 11/2007) and on the basis of the Decision of the Bank of Slovenia on the Base Interest Rate (OJ RS, No. 61/96, 3/97, 23/97 and 81/97).
The monthly base interest rate for a certain month is calculated to one decimal place as the arithmetic mean of the last twelve monthly rates of growth of consumer prices calculated and published by the Statistical Office of the Republic of Slovenia. February's monthly base interest rate equals to January's.
The annual base interest rate for a certain month is calculated from the monthly base interest rate to two decimal places in a similar way taking into account the actual number of days.