The Internal Revenue Service spends too much time and effort auditing people who make $200,000 to $400,000 and too little going after the very wealthiest Americans, according to an inspector general’s report.

In response, the IRS said it is re-examining its decision to consider $200,000 a “high income” for auditing purposes and look at indexing that threshold to inflation. In an era of declining budgets, the move could lead to employees of the tax agency who specialize in the complex returns of the rich to focus on the superwealthy instead.