Roth 401(k) Contributions — Answers to Common Questions Blog Feature
Eric Droblyen

By: Eric Droblyen on January 25th, 2017

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Roth 401(k) Contributions — Answers to Common Questions

Roth 401(k) | Retirement Planning | Plan Design

In a 2016 401k plan design study of 2,767 small businesses, we found 66% permit participants to make after-tax Roth contributions to their personal account. I think it’s safe to assume the high adoption rate of this 401k plan feature is due to participant demand.

Why do 401k participants like Roth contributions? They offer a tax-free nest egg at retirement. To earn this benefit, participants pay taxes on their Roth contributions in the year they are made — at personal income tax rates. This differs from traditional 401k salary deferrals, which are tax-deductible in the year they are made - and then tax-deferred until withdrawal.

While Roth 401k contributions are popular, they are not for everybody. Because Roth contributions are taxed upfront, participants are often forced to contribute less - reducing the earnings power of these contributions over time. Further, participants that expect lower tax rates in retirement are probably better off making pre-tax salary deferrals.

If your 401k plan does not currently include Roth contributions, I think now is a great time to give them a fresh look. Personal income tax rates are at historic lows, making Roth contributions more affordable than ever. You can use this FAQ to help decide if Roth contributions are right for your 401k plan.

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Who are the best candidates for making Roth 401k Contributions?

Generally, 401k participants that expect their tax rate to be higher in retirement than it is today are the best candidates for Roth contributions. The ideal candidate is a young worker that expects their income to climb throughout their career and a large – otherwise taxable – nest egg at retirement.

However, high earners with taxable investments can also benefit from Roth contributions. Unlike Roth IRA contributions, there are no income restrictions for making Roth 401(k) contributions. That means high earners can build a large tax-free account over time to hedge against their taxable investments.

That said, nobody has a crystal ball regarding future tax rates. 401k participants at all income levels choose to make Roth deferrals to reduce their taxable retirement income.

Who is eligible to make Roth 401k contributions?

When a 401k plan includes a Roth feature, any 401k participant eligible to make pre-tax salary deferrals is also eligible to make Roth contributions.

What is the Roth 401k contribution limit?

Roth contributions are subject to the same IRC Section 402(g) limit that applies to pre-tax salary deferrals. When applying this limit, these contributions are combined. The 402(g) limit is adjusted annually for inflation. For 2017, the Roth 401k contribution limit is $18,000, plus an additional $6,000 for 401k plans that allow catch-up contributions.

How are Roth 401k contributions taxed at withdrawal?

Because Roth contributions are made with after-tax dollars, they're not taxable at withdrawal. Their earnings can also be withdrawn tax-free when they’re part of a qualified distribution. A qualified distribution is one that occurs at least five years after the year of the participant’s first Roth contribuion and is made:

  • On or after attainment of age 59½,
  • On account of disability, or
  • On or after the participant’s death

When Roth 401k funds are withdrawn as part of a non-qualified distribution, their earnings are taxable at personal income tax rates and may be subject to a 10% early withdrawal penalty.

What is an in-plan Roth 401k rollover?

An in-plan Roth rollover, also called an in-plan Roth conversion, is a reclassification of non-Roth 401k funds to Roth funds. Any 401k plan that includes a Roth feature can permit in-plan Roth rollovers. 401k participants can convert any vested balance, including earnings, to Roth funds.

When a 401k participant makes an in-plan Roth rollover, they must report the rollover amount as taxable income for the year of the conversion and pay the tax due. However, these rollovers are not subject to the 10% early withdrawal penalty or mandatory income tax withholding.

Participants are most likely to make in-plan Roth rollovers in tax years where their income is low or their non-Roth account balance has dropped in value. 

Are Roth 401k accounts subject to the same RMD rules as Roth IRAs?

No. While Roth IRA contributions are not subject to IRS Required Minimum Distribution (RMD) rules until the death of the IRA owner, RMDs from a Roth 401k account must commence on April 1 of the year following (whichever occurs last):

  • Participant turns 70 ½ or
  • Year participant retires

5% owners of the 401k plan sponsor must start RMDs by April 1 of the year following when they turn 70½.

However, Roth 401k account RMDs can be avoided by rolling their dollar amount to a Roth IRA prior to the RMD deadline.

It’s all about the taxes!

Unfortunately, it can be tough for 401k participants to decide whether Roth contributions are the right choice for them. The two key deciding factors – future income and tax rates – just aren’t predictable.

However, if your 401k plan allows Roth contributions, you owe it to your future self to consider these contributions — especially if these contributions are made even more affordable by lower personal income tax rates.

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About Eric Droblyen

Eric Droblyen began his career as an ERISA compliance specialist with Charles Schwab in the mid-1990s. His keen grasp on 401k plan administration and compliance matters has made Eric a sought after speaker. He has delivered presentations at a number of events, including the American Society of Pension Professionals and Actuaries (ASPPA) Annual Conference. As President and CEO of Employee Fiduciary, Eric is responsible for all aspects of the company’s operations and service delivery.

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