Most high-income individuals are unable to make tax-deductible contributions to a traditional IRA due to IRS limits, yet their earnings level may allow the capacity to save more after maxing out a 401(k). Although any investor with earned income can make a non-deductible contribution to an IRA (up to $6,000 in 2019 if under age 50) and still take advantage of tax-deferred growth, it still may not be advisable. Some investors may even end up paying taxes twice.
5 reasons you shouldn't make non-deductible contributions to an IRA
Reason #1: The Pro-Rata Rule
Assume you're 60 years old and have an IRA worth $500,000. Of that, $60,000 is from non-deductible IRA contributions you've made over your lifetime. If you wanted to withdraw $25,000, could you do so tax-free? The answer is no.
The IRS Pro-Rata Rule applies to withdrawals when you have a traditional, SEP, or SIMPLE IRA with tax deductible and after tax (non-deductible, non-Roth) funds. It doesn't matter how the funds are allocated between the accounts or how many accounts you have. The Pro-Rata Rule must be used to determine the appropriate percentage of a withdrawal that must be allocated to tax-free and taxable dollars.
Here's the formula to find the tax-free percentage:
Total Basis (e.g. lifetime non-deductible contributions - previous nontaxable distributions) / Total IRA Assets (e.g. balance in all IRAs (except Roth) as of 12/31 + all distributions in the current year + outstanding rollovers)
To find the tax-free dollar amount, multiply the tax-free percentage by the full amount of IRA distributions throughout the year.
Using the above example, and assuming the $25,000 withdrawal was made on 12/30 and the aggregate value is as of 12/31, the tax-free portion would be calculated as follows:
$60,000 / $500,000 = 12% tax-free
$25,000 * 12% = $3,000 tax-free and $22,000 taxable as ordinary income
If this seems confusing and like a lot of work, that's because it is! And this example is overly simplified.
It's also worth noting that due to the Pro-Rata Rule, non-deductible contributions to an IRA can't be neatly extracted should you need the funds for another purpose before retirement. Using the above example, but assuming the investor is age 50 and the funds will be used to buy a new car, the implications are as follows:
Taxable as ordinary income: $22,000
10% early withdrawal penalty: $2,200
Had the investor opened a brokerage account instead, the funds could have been withdrawn and used for any purpose at any time penalty-free, but subject to tax, though generally more favorable rates apply...more on that to follow.
Reason #2: Capital Gains vs Regular Income: Pay Less Now Or A Lot More Later
The only reason to consider making an after-tax contribution to an IRA (non-Roth) is tax-deferred growth. If you had invested your non-deductible contribution in a taxable brokerage account instead, you would need to pay tax each year on interest, dividends, and capital gains distributions, even if you don't sell any shares.
While you avoid annual taxation when you make an after-tax contribution to an IRA, when you take distributions in retirement, the taxable portion will be taxed as ordinary income. In 2019, the highest marginal tax rate is 37%.
In a brokerage account, only short-term capital gains and non-qualified dividends are taxed at the higher ordinary income rates. In 2019, long-term capital gains and qualified dividends are taxed at much more favorable rates: between 0% and 20% depending on your regular income bracket. (An additional 3.8% federal net investment income tax may apply to certain taxpayers).
Investors should consider whether the additional years of tax-deferred growth will be worth a tax rate that could be twice as high.
Reason #3: Your Required Minimum Distributions Will Increase
When you turn age 70 1/2 the IRS requires individuals to begin tapping their IRAs (excluding Roth IRAs) and qualified retirement plans (e.g. 401(k) or 403(b) plans). The amount that you'll be required to withdraw each year is essentially the sum of your combined retirement accounts (referenced above) divided by the distribution period from the Uniform Lifetime Table. The greater the assets in retirement accounts, the more your RMD will be, regardless of whether you need the income or not.
As previously explained with the Pro-Rata Rule, when you have made non-deductible contributions to an IRA, a certain percentage of your RMD may be considered tax-free. However, because you have made the after-tax investments in an IRA, your overall pool of assets subject to required minimum distributions has increased.
Particularly for wealthy retirees, satisfying annual RMDs often requires distributions well in excess of capital needs, which can push individuals into a higher marginal tax bracket and cause other tax-related issues, such as higher Medicare premiums.
Funds in a brokerage account are not subject to required minimum distributions, and as discussed previously, qualified dividends and capital gains aren't included in a taxpayer's ordinary income.
Reason #4: Risk of Paying Tax Twice Due to Burdensome Recordkeeping Requirements
One of the most misunderstood aspects of making non-deductible contributions to an IRA is the recordkeeping process. It is the responsibility of the taxpayer, along with the help of their accountant, to report non-deductible contributions to the IRS using form 8606. Once non-deductible contributions have been made, the same form is also required when you're ready to make a distribution and need to calculate the non-taxable portion (explained earlier), or would like to make a Roth conversion.
The form itself is not especially complicated, particularly if you're working with a CPA, but here's how it often goes awry:
Imagine you're 35 years old and make $5,000 non-deductible IRA contributions for five years. You have an accountant, and each time he files the form 8606. Fast forward 25 years, when you're 65 years old and want to make a withdrawal from your IRA. You remember a long time ago you made some after-tax investments in your IRA, but can't find any documentation as so many years have passed. Your accountant was a sole proprietor and has since retired. You decide to cut your losses and include the entire distribution in your taxable income. Congratulations, you've just paid income tax twice on the same $25,000.
One way to help simplify the recordkeeping is to open a new IRA to house all after-tax additions. While this method can certainly help you keep everything straight, it's far from foolproof. Recall the earlier formula to calculate the tax-free portion of a withdrawal: you'll need to know (among other things) your contributions, excluding growth and previous tax-free withdrawals. That information won't be reflected in your account at the financial institution where your IRA(s) are held.
Even if you manage to maintain your own records the entire time, consider whether all of the paperwork-hoop-jumping is worth the potential benefits of tax-deferred growth given the other considerations.
Reason #5: Inherited IRA Issues
When an investor passes away with assets in a brokerage account, those funds will typically receive a 'step-up' in basis as of the date of death. Here's a simplified example: an individual purchased a mutual fund 10 years ago for $50/share and it is worth $100/share on their date of death. The beneficiary's basis for tax purposes is $100/share. Unlike recordkeeping requirements for IRA contributions, the IRS began requiring financial custodians to track and report adjusted investment cost basis in 2011.
However, when an individual dies with assets in an IRA, the beneficiary's tax basis in the account will be the same as the decedent's - there is no 'step-up' in basis. If the deceased had previously made non-deductible contributions, the beneficiary would need to locate the appropriate records and previous 8606 filings to exclude a portion of the withdrawal from their taxable income.
Given how difficult it can be to maintain even personal records over a lifetime, sustaining that discipline over multiple generations might be a tall order.
Other ways to save for retirement
Although an after-tax non-Roth addition to an IRA may not be your best option, there are other ways you can save for retirement and your other goals. If you're not already maxing out your retirement plan at work, ($19,000 in 2019 if under age 50 and $25,000 if 50+) consider starting there. As discussed in the article, a brokerage account is a completely flexible way to invest for any goal.
A Roth IRA would alleviate the majority of issues surrounding after-tax contributions, but wealthy taxpayers may need to consider a Roth conversion as there are income limits for regular participation. However, depending on your overall tax and financial situation, a Roth conversion may also be unadvisable, especially if you end up in a lower tax bracket in retirement.
Weigh the various tax benefits associated with retirement accounts against other considerations to avoid letting the tax-tail wag the dog. Remember, laws can change: Required Minimum Distributions became law in 1986 and the Roth IRA was born in 1997. Review your current strategy as changes are made in the future to ensure you're still on the right track.