I have two more HST periods to report for 2015 - but they were filed late, and we did not receive the refund cheque and deposit it to the farm account until January 2016. Do I still process them for 2016, and leave the balance owing (refund) until we actually deposit it in 2016? I guess my question is, can I leave an unpaid HST report in 2015?
Process the HST on the ending dates for your reporting period(s) in 2015 and record the deposits in 2016. Your unpaid HST is an Accounts Receivable as of end of 2015 and is correct to leave it that way.