What are you going to do if the check bounces? It is payable to your bank, not payable to the Treasury.
On the other hand, I seem to remember that if someone comes in with a properly completed IRS form 8109 (I think that is the number of the blue printed form) and CASH, that you have to take it as a "U S Depository."
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Al Miller, CRCM
Opinions expressed are my own and not necessarily shared by my employer.