The California Department of Tax and Fee Administration (CDTFA) announced the interest rates for underpayments and amounts past due and for overpayments for the period January 1, 2019– June 30, 2019. (CDTFA Interest Rates (September 1, 2018)) For that period, the interest rate for underpayments and amounts past due will remain at 7%. The interest rate for overpayments will increase to 2% (from 1%).
These interest rates apply to sales and use tax, cigarette tax, hazardous substances tax, alcoholic beverage excise tax, motor vehicle fuel tax, use fuel tax, diesel fuel tax, energy resources surcharge, and emergency telephone users surcharge. They do not apply to the IFTA (International Fuel Tax Agreement) program.