Hello. I am eligible to receive a stimulus check but didn’t get one. I was searching through my return to try to find a reason why and noticed that a box was checked saying that I could be claime

[AnnetteB6]

According to the information on the IRS site, if you were claimed as a dependent or can be claimed as a dependent, then you will not be eligible for a stimulus payment.  Having checked the box on your return that you could be claimed as a dependent will disqualify you from receiving a stimulus payment.  

IRS - Economic Impact Payment

@jccar15

[Texas Roger]

You are not eligible for the stimulus payment if you checked the box on your tax return that you can be claimed by someone else.  You must check the box if you meet the requirements to be claimed by someone else even if they don't claim you.

If you do not meet the requirements to be claimed by someone else, you can prepare, print, and mail an amended return form 1040X to "uncheck" the box. DO NOT uncheck the box until you start the amended return. Here is a link to help you: https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed

Amended returns must be printed and mailed. They can't be efiled. You must print and mail it yourself. In normal times, it takes the IRS about 16 weeks to process an amended return. It's taking much longer than that now. 

An alternative for you is to wait until you file you 2020 tax return and not check the box on that return. The stimulus payment is actually an advance on a credit claimed on your 2020 tax return. You could get it when you file your 2020 return.