Millions of Americans who may still be eligible for $1,400 stimulus cheques and unique tax credits worth thousands more are being contacted by the IRS.

Credit - Getty Images

A Recovery Rebate Credit payment is now available to those folks who did not get the third federal stimulus check.

Credit - Getty Images

These stimulus payments began to be distributed in March 2021, offering eligible recipients up to $1,400 each.

Credit - Getty Images

Those who didn't may still be able to collect what they are due.

Credit - Getty Images

People who acquired a dependent or saw a decrease in their income in 2021 may be eligible for the third stimulus check.

Credit - Getty Images

Filing 2021 tax returns is a requirement for persons qualified to receive stimulus check payments and other forms of credit.

Credit - Getty Images

Those who didn't file tax returns in prior years may gain a lot by completing a tax return for 2021.

Credit - Getty Images

Many of the folks who will be getting letters in the coming weeks qualify for the Earned Income Tax Credit or the Child Tax Credit.

Credit - Getty Images

For 2021 tax returns, the late filing deadline is October 17, however after that day, taxpayers can still claim tax benefits.

Credit - Getty Images

By going into your IRS online account, you may see the total of all three of your stimulus checks.

Credit - Getty Images