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@Glenn Z wrote:

exceeds his basis, ... form 6198 does not populate automatically

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Although I realize that some people use Form 6198 as a work-around, that form is NOT used for limiting Basis.  That is for At-Risk Limitations, NOT Basis Limitations.  So that may be why it is not populating automatically.

In ProSeries, you need to limit Basis manually.  Only enter the amount of the loss allowed (if any) and MANUALLY carry over any excess losses.