For this year there's not a lot than anyone needs to worry about.
That's the sweet spot. Then you know you had your money all throughout the year and weren't giving Uncle Sam an interest-free loan.
If you want to save tax dollars, deferring your funds into a retirement account is probably the best solution. That money grows tax free and (if you take out a traditional IRA) you reduce your taxable income in the year you make the contribution.