All Democratic contenders would increase taxes on businesses. Here's how much revenue each candidate's plan would raise.

Tax payments on repatriated cash are an area of focus for auditors.

Agency is lagging on its plan to accelerate and streamline corporate audits.

The Treasury Department is looking at loosening or removing Obama guidelines designed to prevent U.S. companies' offshoring of earnings.

Cash flow to the U.S. hasn't met expectations set prior to tax law change; still, it reached a record $877 billion last year, with nearly half coming from jurisdictions considered tax havens.

Companies are bringing back cash, but repatriation totals are less than a quarter the estimates at the time Trump tax law was enacted.

New regulations help exporters understand whether a deduction in the 2017 tax overhaul, which could lower income tax to 13 percent, applies to them.

Management savvy, not the Trump tax law, is the primary reason the tech giant expects an IRS refund despite bringing in nearly $10 billion in profits.