By Dan Weil IRAs are a tried and true vehicle to save for retirement. The basic idea is that your savings grow tax-free. Individual retirement accounts are a tried and true vehicle to save for retirement. The basic idea is that your savings grow tax-free, giving them a boost. With standard IRAs, you pay no income tax on the money you put into your IRA account. You can take the money out beginning at age 59½. When you do, you pay taxes on the withdrawals at your regular income tax rate. Then there are Roth IRAs. When you put money into these, the funds are taxed at your regular income tax rate….