At this point you do nothing. Not one single thing. About 3-4 weeks **AFTER** you have physical control of the refund you will receive a letter in the mail from the IRS explaining what they changed on your tax return and why. In that letter will also be instructions on what you are to do if you don't agree with the change. I'm assuming you'll agree with it.
If you agree with the change, then you need to let us know "EXACTLY" what the change was so that we can assist you with getting your already e-filed and accepted federal tax return to match up with what the IRS changed. That way, you won't have any issues when you import your 2019 tax information into your 2020 tax return next year.
If your state also taxes personal income then you **NEED** to let us know what states. Chances are that changes to your federal tax return *WILL* affect your state tax return. If so, then things need to be handled differently so that if you need to amend your state tax return, you can. Don't just go arbitrarily changing things without guidance. Otherwise, you risk creating a quagmire that will put you in a never-ending nightmare from which you will never awaken.
