Thank you very much Kaye, but I just realize this evening that even though the check was made payable to IRS but I sent it with the wrong form, not 1040 ES but 540 ES which is california state. Sadfully I didn’t copy the form before I sent it but I just found the remainder of the 540ES form that I cut the section of for this last quarter.
I will follow your advice not to stop payment, but what should I do with the form ? Send a 1040 ES with a letter explaining the situation Or will they cash the check even it was accompanied with a wrong form ?
Appreciate your advice.