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@HudsonCPA wrote:

This can't be the only instance of different treatments of business issues at State and Fed level (bonus depreciation is one example of different treatments.)

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In my State (Minnesota), the State uses the Federal forms but then adds a separate form for adjustments from Federal (such as Bonus depreciation).  And I suspect that is the case is many other states.  So in those cases, there is no need for a separate Schedule C.

It is EXTREMELY unlikely that ProSeries will add that capability.  So unless MA comes out with a separate form, it seems likely your only option is to do as I suggested above.

While I wouldn't want to suggest doing it against MA rules, personally, I wouldn't be overly concerned about audit potential if it were done wrong.  If audited, what is going to happen?  They switch a few numbers and end up with the same result.