On 16 April 2008, HMRC announced changes in interest rates for quarterly installment payments of corporation tax, and for early payments of corporation tax not due by installments. The interest rate on underpaid corporation tax due by installments is reduced from 6.25% to 6%. The interest rate on overpaid installment payments, and on corporation tax paid early (but not due by installments), is reduced from 5% to 4.75%. The revised rates take effect from 21 April 2008.