The Internal Revenue Service is making a last-ditch effort to reach 9 million Americans who are eligible for — but have not yet claimed — their CARES Act stimulus money.

The tax agency said it will send out letters later this month alerting people who didn’t file federal taxes for 2018 or 2019 but meet the income criteria.

The stimulus checks were sent out first to tax filers, then to people such as seniors, veterans and the disabled.

Others, including people who don’t file taxes or get federal benefits, are eligible for the funds — but since they’re not on Washington’s radar, the IRS doesn’t have a way to send them that money.

The IRS said it will send out a letter starting on Sept.

“This money means more to them than to anybody else, but they’re the hardest to reach,” said Chuck Marr, director of federal tax policy for the Center on Budget and Policy Priorities, a left-leaning think tank that spearheaded an online outreach effort over the summer telling people if they were eligible and how to file for their stimulus payments.

The people that have fallen through the cracks, Marr said, are many of those who are enrolled in state-administered programs like food stamps and Medicaid, but don’t get federal benefits