My taxes where deducted from 6,684$ to 4984$ because of the recovery rebate credit how do I fix it. I was missing my second stimulus.

[DMarkM1]

You should receive a letter from the IRS explaining the changes and providing instructions on how to respond if you do not agree with the changes.  The letter will have contact information you can use.  

Here is a link with more information on IRS corrections to the Recovery Rebate Credit.  

[VolvoGirl]

How much is on 1040 line 30?  Is it more than 1700?  The 1,700 difference sounds like the first Stimulus for Single with 1 dependent 1200+500.  Did you already get that?  The second Stimulus amount is $600 per person.  

If you claimed a missing stimulus payment on your return but the IRS took it off you have to ask the IRS. They think they already sent it to you. Maybe it went to an account you don't remember. Or you got a check or a card. It was probably easy to miss the debit card in the mail and think it was junk mail. They have to put a trace on it.

See Question G4 here,
https://www.irs.gov/newsroom/2020-recovery-rebate-credit-topic-g-correcting-issues-after-the-2020-ta...