Modvat credit restriction on specified petroleum inputs limits available duty credit for domestic and imported inputs. The amendment restricts modvat credit on specified petroleum inputs (naphtha, furnace oil, low sulphur heavy stock, light diesel oil, bitumen and paraffin wax) used in manufacture in India: for domestically produced inputs the credit is limited to excise duty calculated at the rate of 10% ad valorem; for imported inputs the credit is limited to additional duty calculated by assuming a like domestic input is chargeable at 10% ad valorem.