The first U.S. tax filing season under the overhaul that President Donald Trump signed into law at the end of 2017 got off to a slow start in the first week, with data released on Friday showing a significant drop in returns and refunds.

According to the Internal Revenue Service, the total number of returns received in the week ending Feb. 1, 16.04 million, was down 12.4 percent from the week that ended on Feb. 2, 2018. Only 13.31 million returns were processed, down 25.8 percent from the year before. The average refund of $1,865 was 8.4 percent smaller than the average refund in the period last year.