The U.S. IRS has announced the interest rates for overpaid and underpaid tax for the calendar quarter beginning 1 January 2018, which are unchanged from the previous quarter. The rates are 4% for both underpayment and overpayment by individuals, and 3% and 4% for corporate overpayments and underpayments, respectively. The rate for corporate overpayments exceeding USD 10,000 in a tax period is …