Federal return took money

[Kcurrier4]

I filed in February and just got a notice from federal that they took $600. I don’t know why. 

[MaryK4]

See Why is my federal refund less than I expected?

[SweetieJean]

Sounds like the Recovery Rebate Credit.  See this:

IRS letters explain why some 2020 Recovery Rebate Credits are different than expected | Internal Rev...

[VolvoGirl]

You must have had 600 on 1040 line 30.  That would have been for the second Stimulus payment if you didn't already get it.  Did you get both the first and second rounds?  Maybe the second one came after you filed?  The IRS knows they already sent it to you.  But you tried to claim it again on your tax return.