Millions of Americans have received their third stimulus checks, but some fourth relief payments have been sent out by mistake.

The Internal Revenue Service (IRS) mistakenly sent out some additional $1,400 payments.

These checks were sent out to some single people who don’t have children, according to WINK News.

If you have received one of these payments, the IRS said it would be best to send it back.

You should expect to receive a letter containing instructions on how to send the check back.

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You can send the payment to the IRS address based on the state you live in, according to the IRS website. You can find the locations listed here.

If you didn’t cash the check yet, you can mail it back by first writing Void in the endorsement section on the back of the check and include a brief explanation of why you want to return it.

In case you deposited or cashed the check already, then you will be asked to return back the money by mailing a personal check or a money order to the appropriate IRS location.

Read more at US Sun.