Thousands of high-income earners have not filed tax returns for several years, but the cash-strapped Internal Revenue Service did nothing to get them to pay what they owe.

That is now changing, the tax agency announced Thursday. The IRS will send notices to thousands of people who made more than $400,000 and did not file returns in at least one year from 2017 to 2022, the first step to collecting any tax owed.