Rates are set by fiscal year, effective October 1 each year. Find current rates in the continental United States ("CONUS Rates").
Unlike IRS penalties, where the IRS is permitted to remove or reduce a penalty based on reasonable cause, the law does not permit the IRS to remove or reduce interest based on reasonable cause. However, there is a situation when the IRS will remove interest.
The law requires the IRS to remove interest up to the date you were requested to repay an erroneous refund when: