Thanks.    If an activity is not regular and continuous, then it is not a trade or business reportable on Sch C.   But IRS instructions say report 1099 box 7 income anyway on a Sch C.  This appears to be  somewhat contradictory, so I still think in this situation one option is to pay the SE tax consistent with the 1099 reporting in box 7 (if the payer of the income won't change the 1099) but report as Other Income not as Sch C.  And don't take QBID.  Or as someone else suggested, report on Sch C but forego QBID.  I'll go with the Sch C, even though I still think it's a bit unclear in this situation.  Thanks again!