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Is there an advantage to a traditional but non-deductable IRA over a taxable account? [duplicate]
The most common use of non-deductible Traditional IRA contributions these days, as JoeTaxpayer mentioned, is as an intermediate step in a "backdoor Roth IRA contribution" -- contribute to a Traditional IRA and then immediately convert it to a Roth IRA, which, if you had no previous pre-tax money in Traditional or other IRAs, is a tax-free process that achieves the same result as a regular Roth IRA contribution except that there are no income limits. (This is something you should consider since you are unable to directly contribute to a Roth IRA due to income limits.) Also, I want to note that your comparison is only true assuming you are holding tax-efficient assets, ones where you get taxed once at the end when you take it out. If you are holding tax-inefficient assets, like an interest-bearing CD or bond or a stock that regularly produces dividends, in a taxable account you would be taxed many times on that earnings, and that would be much worse than with the non-deductible Traditional IRA, where you would only be taxed once at the end when you take it out.