After you file

@Hunterinflorida 

 

This will not be resolved quickly so you really need to pay the tax bill asap to stop the interest/penalties from piling up.  

 

Next have a trace put on the missing payment you say you never got ... only once the IRS admits the payment was never cashed will they allow you to amend the return for the credit and amended returns can take 6 months or more to process. 

 

If the IRS says the stimulus was sent but you did not get it then you will have to have a trace put on the missing payment:

https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-p...