A handful of early tax filers are seeing unexpectedly low refunds, or worse, owing money to the IRS. But not everyone is in for an unpleasant surprise.

Many people are watching this tax season more closely than usual because it's the first time the Tax Cuts and Jobs Act is in effect for a full tax year. The new law, passed in December 2017, enacted a number of broad changes. It introduced new tax brackets, included an expanded child care credit and changed the way itemized deductions are factored in, for example.