A few unforeseen personal expenses arose in the past few months and long story short I have left myself a bit short for my preliminary tax which is 9 or 10k more than I had budgeted for. Has anyone been in this position previously? My accountant advised to just pay the balance for last year and pay the preliminary tax when I can and said that it's unlikely that Revenue will apply interest if I pay up quickly enough. Should I pay what I can off the preliminary tax now or pay it all together, or does this make any difference beyond potentially accrued interest?