By now, the majority of Americans who are eligible for a $1,400 stimulus check from the American Rescue Plan have likely received their checks. The most recent round of checks sent out under a million of the checks, indicating that the bulk of the approved checks have already been sent out.

The IRS, in sending out the checks, has also sent out an accompanying letter, just as it did for the two previous stimulus checks, in 2020. The IRS is sending out a letter called Notice 1444-C, which will go to everyone who received the 2021 stimulus check.

“Keep any IRS notices received related to the Economic Impact Payments with other tax records,” the IRS said on its website. “The IRS is unable to issue a copy of the notice if it is lost or never received, even though the payment was received. Taxpayers who don't have their notices can view the amounts of the first and second Economic Impact Payments through their online account.”

According to MSN Money, the 1144-C letter arrived for most people about 15 days after the receipt of their stimulus check. It is a follow-up to Notice 1444-A and Notice 1444-B, which went out after the two 2020 stimulus checks.

“It's especially important to keep your IRS letter if your third stimulus check payment hasn't arrived or if you believe that you received the incorrect amount of money when the third check was sent,” MSN said by way of advice about the letters.

“There are many reasons why you might have received the wrong amount, such as the IRS basing your payment amount on an old tax return or the IRS not being aware that you have a new dependent in your family who is entitled to an extra $1,400 payment. And if you didn't get your check at all, it may be because you had an old address or bank account on file.”

That form is not to be confused with the letters sent out, with President Biden’s signature, about Americans’ stimulus checks. That letter drew some measure of controversy, since there had been criticism of former President Trump for actually signing the checks in 2020.

“On March 11, 2021, I signed into law the American Rescue Plan, a law that will help vaccinate America and deliver immediate economic relief to hundreds of million Americans, including you,” the president wrote in the letter sent via the Internal Revenue Service.

“A key part of the American Rescue Plan is direct payments of $1,400 per person for most American households. … This fulfills a promise I made to you, and will help get Americans through the crisis.”

Stephen Silver, a technology writer for The National Interest, is a journalist, essayist and film critic, who is also a contributor to The Philadelphia Inquirer, Philly Voice, Philadelphia Weekly, the Jewish Telegraphic Agency, Living Life Fearless, Backstage magazine, Broad Street Review and Splice Today. The co-founder of the Philadelphia Film Critics Circle, Stephen lives in suburban Philadelphia with his wife and two sons. Follow him on Twitter at @StephenSilver.