It’s great you’re thinking ahead to retirement saving plans. However with a CD, you will need to pay taxes on your gains during the year it was earned. So, if you earned $50 this year on a CD, you would pay taxes on the $50. If you earn $55 the next year, you pay taxes on that interest next year. In other words, you pay taxes on the interest you earn on CDs in the year you earn it, not when you cash in the CD.
If you use the money from the CD to open an IRA, you will defer taxes on the interest your earn by your IRA until you withdraw the money. This is true even if you elect to have a CD as your IRA.