401(k) or Roth IRA Next? How to Choose After the Match

If you already get your full employer match, the next dollar often goes to an IRA when your 401(k) has high fees or limited funds, and back to the 401(k) when it has low-cost options and you want the larger contribution room. There is no single right answer. The decision turns on investment quality, taxes, flexibility and how much you can save in total.

This article is US-centric and uses invented numbers. Annual contribution limits and IRA income limits change, so check the IRS for current figures (Publication 590-A covers IRAs, and the IRS retirement plan pages cover 401(k) limits).

Start by confirming the match is covered

A match is an immediate return that usually beats anything else, so it comes first. The guide on contributing enough to get the full 401(k) match covers formulas and vesting. Everything below assumes you are past that step.

The main differences that matter

Two items stand out. A 401(k) lets you save far more per year, and an IRA usually gives better investment choice and flexibility.

Step 1: Judge the quality of your 401(k)

Look at the fund menu and the costs.

• Expense ratios. Broad index funds can cost a tiny fraction of a percent per year, while some actively managed funds cost 1 percent or more. Your plan’s fee disclosure shows each fund’s cost.
• Plan fees. Some plans add administrative fees on top of fund costs.
• Menu. A decent plan offers a broad stock index fund, a bond fund and target-date funds.

Fees compound. On a $100,000 balance, a 1 percent annual fee costs $1,000 per year, while a 0.10 percent fee costs $100. Over 25 years at a hypothetical 7 percent gross return, a 1 percent fee can cut the ending balance by roughly 20 percent compared with a 0.10 percent fee. That is large, and it is why a weak plan can justify moving extra savings to an IRA.

Step 2: Think about total room

How much can you save in a year? Say you can put away $15,000 beyond your match. The IRA limit is only a fraction of that, so you might fill the IRA and return to the 401(k) for the rest. If you can save only $3,000 extra, either account holds it, and the choice is about features rather than room.

IRA limits are shared across all your IRAs, and both account types have an IRS catch-up amount for people 50 and older. Look up the current numbers before you plan.

Step 3: Think about taxes

Two tax choices stack: traditional vs Roth, and which account holds it.

• If your plan has a Roth 401(k), you can choose Roth treatment with no income limit. Roth IRA contributions phase out at higher incomes, so higher earners may not be able to contribute directly.
• A traditional 401(k) contribution lowers taxable income now at any income, which is valuable in a high bracket.
• A traditional IRA deduction can shrink or vanish if you have a workplace plan and income above the IRS thresholds.

For the tax tradeoff itself, see Roth IRA vs traditional IRA, and if your pay is likely to climb, using a Roth IRA when income is rising.

Worked example: an extra $400 a month

Assume $4,800 a year to invest after the match, a 24 percent bracket and 25 years to go.

Option A: raise 401(k) contributions (traditional). The $4,800 lowers taxable income and saves roughly $1,150 in federal tax, so the take-home cost is about $3,650. Say the plan’s funds cost 0.8 percent a year.

Option B: fund a Roth IRA. No deduction, so the full $4,800 comes from pay. You pick a fund costing 0.05 percent.

At a hypothetical 7 percent gross return, Option B’s lower fee adds roughly 0.75 percent a year to your net return, which over 25 years can mean tens of thousands of dollars on bigger balances. But Option A includes a deduction now. To compare fairly you would invest the tax savings or compare after-tax withdrawal values. The result depends on your real fees and bracket, which is why step one is to look at your actual plan menu. All figures assume constant returns.

When the 401(k) is the better next dollar

• Your plan has low-cost index funds.
• You are in a high bracket and want the deduction now.
• You can save more than the IRA limit.
• You are above the Roth IRA income range and do not want to use workarounds.
• You like automatic payroll deductions.

When the IRA is the better next dollar

• Your 401(k) has high fees or a thin menu.
• You want control over what you hold.
• You prefer Roth treatment and your plan has no Roth 401(k).
• You want the option to withdraw contributions in a real emergency, though that shrinks retirement savings and is no replacement for an emergency fund.
• You may retire early and want account variety. The article on what you need to retire early covers how access rules affect that plan.

Downsides and traps

• Deadlines differ. IRA contributions for a tax year can often be made until the filing deadline the next year, while 401(k) deferrals happen through payroll during the year. Know which tax year a contribution counts for.
• Pro-rata complications. Backdoor Roth steps with pre-tax IRA balances can be taxed in ways people do not expect.
• Too many accounts. Several tiny accounts add paperwork. Simple often wins.
• Cash left uninvested. Confirm the money is actually invested in either account.
• Liquidity. Neither is an emergency fund, since early withdrawals can bring taxes and penalties.

Questions to ask your plan administrator

1. What is the full list of funds, and what does each cost?
2. Are there administrative or recordkeeping fees on top?
3. Is there a Roth 401(k), and does it carry different rules?
4. How is the match taxed and invested? Matches are often pre-tax even if your own contributions are Roth.
5. What is the vesting schedule for the match?
6. Are loans allowed, and what happens to a loan if you leave?

A simple decision flow

1. Capture the full match.
2. Check your 401(k) fees. If they are high, fund an IRA next.
3. If fees are fine, decide on bracket, Roth eligibility and room.
4. Fill the IRA, then return to the 401(k).
5. Revisit each year as income, limits and goals change.

To see whether your overall saving is enough, how to know if you are on track for retirement gives a short set of checks.

Where this comes from

This article draws on the IRS’s page on Roth IRAs, IRS Publication 590-B on IRA distributions, and the IRS’s guidance on early-distribution exceptions and designated Roth accounts. Fee and menu points are general planning considerations; your plan’s own fee disclosure is the authority for your costs. Worked numbers are invented illustrations. Limits, thresholds and fees change, so check the IRS and your plan’s own fee disclosure, and consider a licensed adviser for your situation.