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How to Invest a Rollover IRA: From 401(k) Funds to Your Own Portfolio (2026)
A rolled-over 401(k) usually arrives in your IRA as cash, and it stays there until you invest it. Check this first. Then: 1) pick a stock/bond mix for your timeline and nerves (for example 90/10 in your 20s–30s, 70/30 in your 50s, 50/50 to 60/40 near or in retirement); 2) buy it simply: a target-date index fund, a one-fund global ETF plus a bond fund, or a three-fund portfolio (US stocks, international stocks, bonds) with fees around 0.03%–0.10%; 3) invest the lump sum right away or on a fixed schedule over a few months. Then add to it, rebalance once a year and leave it alone.
Step 0: Make sure it's actually invested
This sounds obvious, but it's the most common rollover mistake. When a 401(k) is rolled over, the old plan usually sells everything and sends cash. At the new brokerage, that cash sits in a sweep account or money market fund.
Regulators and brokerages have flagged that many rollover IRAs stay in cash for years by accident. Log in, and if your balance shows as "cash" or a money market fund, read on.
If you haven't rolled over yet, start with what to do with your 401(k) after a layoff.
Step 1: Choose your stock/bond mix
This one decision drives most of your long-run return and how bumpy the ride feels.
| Your stage | Example stocks/bonds | Why |
|---|---|---|
| 20s–30s | 90/10 or 100/0 | Decades to recover from crashes |
| 40s | 80/20 | Still long horizon; a little cushion |
| 50s | 60/40 to 70/30 | Growth plus stability as retirement nears |
| Early retirement | 50/50 to 60/40 | Money must last 25–30+ years |
| 75+ | 30/70 to 50/50 | More stability; still some growth |
Then the gut check: if this account dropped 30% next year, would you hold? If not, add more bonds. A mix you stick with beats a "better" mix you abandon.
Step 2: Pick one of three simple portfolios
Portfolio A: One target-date fund (easiest)
A target-date index fund picks the mix for you based on the year you expect to retire (for example, a 2045 fund), and gradually gets more conservative. Low-cost index versions from Vanguard, Fidelity, Schwab and iShares charge about 0.08% to 0.15%. It's essentially the same thing many 401(k)s default to, minus the plan's extra fees. More in target-date funds explained.
Portfolio B: Global stock ETF + bond ETF (two funds)
- A total world stock ETF (such as VT), plus
- a total US bond ETF (such as BND or AGG).
Set the split to your chosen mix, for example 70% VT and 30% BND. Fees are about 0.03% to 0.06%.
Portfolio C: The three-fund portfolio
| Fund type | Example | Typical fee |
|---|---|---|
| Total US stock market | VTI, ITOT, SCHB or FSKAX | 0.02%–0.03% |
| Total international stock | VXUS, IXUS or FTIHX | 0.05%–0.08% |
| Total US bond market | BND, AGG or FXNAX | 0.03%–0.05% |
A common stock split is about 60% US and 40% international, though many US investors hold more at home. See the 3-ETF approach and why expense ratios matter.
These tickers are examples, not recommendations. Any brokerage's equivalent total-market index funds work. Most major brokerages now charge $0 commissions on ETF trades; see Fidelity vs Schwab vs Vanguard.
Step 3: Get the money invested
A rollover can be a big number, and it's normal to worry about buying right before a drop.
| Approach | Pros | Cons |
|---|---|---|
| Invest it all now | Historically wins about 2 out of 3 times (Vanguard research) | Harder emotionally if markets fall soon after |
| Spread it over 3–12 months | Less regret; easier to stick with | Slightly lower expected return; cash drag |
| Wait for a dip | — | Dips are unpredictable; often means years in cash |
If you choose to spread it out, set up automatic purchases on fixed dates so you don't second-guess each one. See dollar-cost averaging.
Step 4: Think about taxes, the IRA way
Inside a traditional rollover IRA, trades and dividends aren't taxed. Withdrawals are taxed as ordinary income later. A few tax ideas fit here:
- Hold tax-inefficient assets here. Bonds and REITs, which throw off income taxed at ordinary rates, often belong in an IRA rather than a taxable account.
- Consider partial Roth conversions in low-income years, such as the year of a layoff or the gap between retirement and Social Security. You pay tax now at a low rate; future growth is tax-free. See Roth vs traditional IRA.
- Backdoor Roth caution. A large pre-tax IRA balance makes backdoor Roth contributions partly taxable (the pro-rata rule). If you plan to use the backdoor Roth, consider rolling pre-tax money into a new employer's 401(k) instead.
Step 5: Maintain it (an hour a year)
- Rebalance once a year, or when a holding drifts more than about 5 percentage points from target. Target-date funds do this for you.
- Add new money. You can contribute up to $7,500 to IRAs in 2026, or $8,600 if you're 50 or older.
- Update your beneficiaries. A rollover IRA doesn't inherit the 401(k)'s beneficiary designation. Set it now.
- Consolidate old accounts. Fewer accounts are easier to manage and rebalance.
Mistakes that cost rollover investors the most
- Leaving it in cash. The silent killer of rollover IRAs.
- Panic-selling in a downturn. Locks in losses and often misses the rebound.
- Chasing hot funds or sectors. Last year's winner is often next year's laggard.
- Paying high fees. A 1% advisory or fund fee can cost six figures over a career.
- Being too conservative too early. At 55, your money may need to last 35 years.
The bottom line
A rollover IRA gives you lower costs and full control, but only if you put the money to work. Confirm it's invested, choose a mix you can stick with, use one to three low-cost index funds, and then mostly leave it alone. Time in the market, not timing the market, does the rest.
This article is educational and not personalized investment advice. Fund names are examples, not recommendations.
Frequently asked questions
Why is my rollover IRA in cash?
Most 401(k) plans sell your funds and send the rollover as cash. At the brokerage it lands in a cash sweep or money market fund until you choose investments. It won't be invested automatically, so log in and check.
What should I invest my rollover IRA in?
For most people, a diversified, low-cost mix of stock and bond index funds. The simplest option is one target-date index fund matching your expected retirement year. Others prefer a three-fund portfolio of a total US stock fund, a total international stock fund and a total bond fund.
Should I invest my rollover all at once?
Research from Vanguard found investing a lump sum immediately beat spreading it out about two-thirds of the time, because markets rise more often than they fall. Spreading it over 3 to 12 months is a reasonable choice if it helps you stay invested. Leaving it in cash indefinitely is the costly option.
Can I buy individual stocks in a rollover IRA?
Yes. A rollover IRA at a brokerage can hold stocks, ETFs, mutual funds, bonds and CDs. Gains aren't taxed inside the IRA, but losses also can't be deducted, and concentrated positions add risk. Many investors keep individual stocks to a small slice of the account.
Should I convert my rollover IRA to a Roth?
Maybe, in a low-income year such as after a layoff or early in retirement. The converted amount is taxed as ordinary income that year, but future growth and qualified withdrawals are tax-free. Pay the tax from outside the IRA if you can, and consider converting in pieces to stay within lower brackets.
Can I keep contributing to a rollover IRA?
Yes. A rollover IRA is just a traditional IRA. You can contribute up to $7,500 in 2026 ($8,600 if you're 50 or older), though the deduction may be limited if you or your spouse has a workplace plan and your income is above certain levels.
Primary sources
Data & disclaimer: This article is for educational purposes only and is not financial or investment advice. Figures reflect data available as of Oct 25, 2026, and conditions change — always confirm current pricing, rates and rules with the provider before you act. Written by Elizabeta Dimoska. See our editorial standards and disclosure.
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