The IRS guidance to those who have already filed prior to ARPA being passed is to NOT file an amendment, that they will fix it on their end. What I would do, if I were in your shoes where you have filed but not yet paid the amount your return said you owed before ARPA passed would be to run the TT update and let it fix your numbers, so that you will know how much you now owe, or how much you should now be getting as a refund, but do NOT file the updated tax forms. At this point, either pay the new amount you owe, or sit back and let the IRS eventually send you a refund.
