The Internal Revenue Service has a message for companies that owe taxes on overseas profits: Auditors are closely watching.

The IRS included repatriation tax payments—the levies companies owe on their accumulated offshore earnings, according to the 2017 tax law—as an area of focus for the agency's auditors, according to a list on their website updated Monday. Agency officials previously said the area is ripe for abuse because companies could try to minimize their foreign profits in an attempt to reduce their tax bills.

President Donald Trump's tax overhaul requires U.S.-based companies to pay tax on the trillions in profits they've stashed abroad since 1986. The new rules set a one-time rate of 15.5 percent on cash and 8 percent on non-cash or non-liquid assets. Payments can be made over eight years.