The IRS has already sent out millions in stimulus checks under the third stimulus bill. So if you have not yet received your $1,400 payment, do not be alarmed.

However, if you believe that you should have received your third stimulus check but have not yet received it, there are a few things you can do to ensure that you receive your payment; the same applies if you have not yet received part or all of your first or second stimulus check.

If you are not sure if your stimulus check has been sent out, the easiest way to check is to use the IRS online tracker. You can also use the IRS stimulus check phone number.

If you qualify for a third stimulus check, you should be able to check the status of your payment through the IRS Get My Payment portal. This includes those who are not eligible to receive the full stimulus package. Here's how:

Then you should see the payment status of your stimulus check. If it has not yet been remitted, you have nothing to worry about.

If you see "Payment Status Not Available," it means that you are not eligible or that the IRS has not yet completed the tax return process.

If you have signed up for the USPS Informed Delivery Tool, you can track your stimulus check through the mail and receive a notification when the check arrives in your mailbox. More information can be found here. However, if the check does not arrive, you will need to escalate the situation.

The first thing to check is how you are supposed to receive your stimulus check and how long it has been since the IRS sent payment. This information is available on the Get My Payment app.

Direct deposit is the fastest method and should reach your account within five days after the IRS approves payment. Mailing a check takes four weeks for a regular address, six weeks for a forwarded address, and nine weeks for a foreign address.

Also, regardless of how you send your payment, you should receive a letter from the IRS around 15 days after the third stimulus check is sent. This is called "Notice 1444, your Economic Impact Payment." Keep this on file, as you will need it to claim the missing payment.

After receiving the notice, or if the payment has not yet been received after the allotted arrival period, you are to file a Payment Trace with the IRS.

There are two ways to file a Payment Trace: first, you can call 800-919-9835 and listen to all recorded messages and connect with an IRS agent. Alternatively, you can download Form 3911, Taxpayer Statement Regarding Refund, from the IRS website and mail or fax the completed form to the IRS.

Just follow these instructions given by the IRS:

You do not need to mail Form 3911 if you tracked your payment by phone.

It can take up to six weeks to receive a response from the IRS regarding payment tracing. If the original check is not cashed, the IRS will issue a replacement check. If you find or receive the original check, return it to the IRS as soon as possible.

If the check was cashed, you will receive a claim package from the Treasury Department that includes a copy of the cashed check. If you follow their instructions, your claim will be reviewed before the IRS decides to reissue the check.