Technically, no. But I'm not the one who programmed the IRS computers on this. They "might" kick out a CP notice sometime after you have filed your 2018 tax return. So just to "make the computer happy" I would suggest you go to http://www.irs.gov/payments and pay $1 (one dollar) estimated tax for the 4th quarter. That way the fact that "an activity" of some type related to the tax payment is recorded by the computer, negating the probability of it kicking out a notice later, that when received in the mail would waste your time.