CNBC
This spring marks the first time taxpayers are submitting returns under the Tax Cuts and Jobs Act (TCJA), which went into effect in last year.As part of the TCJA, the IRS and Treasury adjusted the tax withholding tables, which affects the amount of income taxes withheld from your pay. Some early filers are discovering that they either owe the IRS or they'll be getting a smaller-than-expected refund from the taxman.