Why I Always Make Prior-Year IRA Contributions
Most financial advice says to invest in your IRA as soon as you can afford the contributions. Whether that's a big lump sum on Jan. 1 or a few hundred bucks every month, investing early has its benefits. The more time your money has to compound inside an IRA, the more likely it is to grow. In general, it's very good advice.
But I always wait until I'm compiling my tax return to determine whether I make my contribution to a traditional IRA or a Roth account, so I always make prior-year contributions.
Source Fool.com