If you are making contributions to a traditional IRA and are not going to take a tax deduction (maybe because your income is too high) then you need the current year contributions and also the total of past year non-deductible contributions, which will be on form 8606 from your past tax return. This will generate a new form 8606 this year. Keep copies of form 8606 for as long as you live, they are an exception to the general rule that you can discard tax papers after 3 or 6 years.
If you are making contributions to a Roth IRA, it may be helpful to tell turbotax about your past contributions so the program can help you keep track, this may be useful in the future if you need to withdraw funds before age 59-1/2.
