(CNN) - Tax season is off to a slower start this year, with early filers seeing smaller average refunds.
The average refund is down about 9% under the first full year of the overhauled tax code, according to the latest data released by the IRS. Refunds averaged $1,865 compared to $2,035 for tax year 2017.
The total number of returns received also dipped during the first week of the season ending Feb. 1, down from about 18 million to some 16 million so far in 2019.
This season will be watched closely to gauge the real impact of the Republican-led tax overhaul in 2017 that ushered in the most sweeping changes to the tax code in 30 years.
The new rules lowered most individual rates and nearly doubled the standard deduction. The legislation also included sweeping tax cuts for companies, lowering the corporate rate to 21% from 35%.
Some workers saw a bump in their take-home pay after employers started using the new IRS income tax withholding tables.
But experts have said people could see smaller refunds than expected if they didn't adjust their paycheck withholdings after the changes took effect. Others could see their tax burden increase because the revised code eliminated some popular deductions.
The average American taxpayer got a refund of about $2,700 last year, according to IRS statistics.
Filing season opened just days after the end of the longest partial government shutdown in US history. "We thank the Treasury and IRS employees who have been working diligently to ensure the system is processing these returns efficiently," Treasury Secretary Steven Mnuchin said in a statement Friday.
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