Turning After-Tax Plan Contributions Into Tax-Free Retirement Income

With the threat of higher taxes on the horizon taxpayers are increasingly looking for ways to hedge that risk in retirement. This is especially true for those who have participated in an employer-sponsored retirement plan at their workplace for many years or even decades.

For many savers most, if not all, of their retirement savings are held within traditional, pretax accounts. Roth contributions within employer plans became available in 2006. But it has taken years for plans to add this feature and for participants to begin utilizing it as an option for a portion of their salary deferrals.

Of the $40 trillion retirement assets (ICI, Sept 2024), Roth accounts reflect a relatively low percentage of the overall total.

So, how can those who are still working and participating in an employer plan save more in Roth accounts without negative tax consequences on their current tax bill?

One strategy is to determine if your defined contribution plan allows voluntary, after-tax contributions into the plan. These are different from Roth 401(k) contributions made through salary deferrals. Voluntary after-tax contributions can be made in excess of your maximum salary deferral into the plan ($23,000 for 2024 not including catch-up contributions for those age 50 or older).

Retirement plan contribution limits for 2024

A benefit of making after-tax contributions within the plan (in excess your maximum salary deferral) is that these contributions, depending on specific plan guidelines, may be transferred to a Roth account within the plan, or directly transferred out of the plan to a Roth IRA. Since these are after-tax contributions, there is no tax when moving them from the after-tax portion to a Roth account. This action is sometimes referred to as a “mega backdoor Roth strategy.” It may be effective for higher earners who are maxing out their 401(k) plan to significantly fund a Roth account, even though their income restricts them from directly funding a Roth IRA. For 2024, income phaseouts on Roth contributions apply once modified adjusted gross income exceeds $146,000 for single filers and $230,000 for married couples filing a joint return.