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@QueenB2064 wrote:

It's complicated. After using the marketplace tool to calculate the MSLCSP and entering it in column B

and leaving column C as zeros as shown on the 1059-A, ProConnect comes up with a critical efile rejection error.

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Does entering the SLCSP in column B result in a credit?  If so, you are cheating your client by not filing the form (and maybe have been for the past several years).

Leave column C blank (not zero).