The U.S. IRS has announced the interest rates for overpaid and underpaid tax for the calendar quarter beginning 1 January 2019, which are increased from the previous quarter due to an increase in the federal short-term rate. The rates are 6% for both overpayments and underpayments by individuals, and 5% and 6% for corporate overpayments and underpayments, respectively. The rate for corporate ov…