Do you remember entering the estimate payment? Did it show up somewhere else like on line 16? Wait a minute? It is included in line 18 with your other withholding, etc? Then definitely double check line 16. The IRS added it on line 17 for you. But if it was already in your return (on the wrong line) then eventually the IRS will see it and ask for it back. They will say you reported too much on line 16.
