Retirement tax questions

Yes. to all questions. let me explain. Filed taxes already received refund. Wife received a W2 afterwards. Need to amend so enter the w2 and the $700 of income equates to owing $122 more in tax. So I have added $100 post tax dollars to my IRA in the interem. I enter this into Turbotax and it brings down the damage to something like $72. I want to contribute more so that I dont mail IRS a check. But for some reason the program asks about distributions from year 2015 thru year 2018 and when I enter the 2018 info the refund meter goes up to like $300 or close to it. Do I need to declare this now or take the hit next year when my payroll withholdings will likely cover the damage