I did not pay past 3 quarters of estimated taxes. Can I pay those 3 quarters of estimated taxed before April 15 and will that affect my return?

[DianeW · Accepted solution]

No, but you can pay your balance due when you file your return.  Any payment made now will be for the first quarter of 2018 and applied to that tax year. You may have some interest for late payment if you didn't have enough paid in on time.