I have been told that line 30 is for if u didn't receive the 3rd round of checks if U did you are to put 0 on that line the 1400 says you weren't paid and asking for the payment IRS knows who got what and who didn't so since you had already been paid so the IRS took that away from your return. but I put mine on line 28 and they still took it off of my return and then I was still over 1000 short. I'm taking mine return to another preparer to check out they will do it for free but if you need to prepare a 1040X form to correct a mistake then you will have to pay. for that return.
