Asset Allocation CalculatorGuide
401(k) Asset Allocation: How to Split Your Retirement Account
Updated · 8 min read · Independent — we never recommend specific funds or products
Quick answer
Match your 401(k) mix to the years left until retirement: many savers hold roughly 85–90% stocks with 30+ years to go, about 60–70% with ten years to go, and around 40–55% at retirement. The easiest route is a target-date fund that shifts automatically; the alternative is to build a stock/bond mix yourself and rebalance it once or twice a year.
A 401(k) is a tax-advantaged account, not an investment. What you hold inside it — how much in stocks, bonds and cash — decides how it grows and how bumpy the ride is. Most plans give you a menu of funds, and choosing from it is the whole game.
Two approaches: target-date fund or DIY
- Target-date fund. Choose the fund whose year matches when you expect to retire. It holds a diversified mix and automatically becomes more conservative over time. One decision, no maintenance.
- Build your own. Split your contributions among a stock fund, a bond fund and perhaps a cash option, then rebalance periodically. More control, more responsibility.
Either is fine. The mistake is doing both without realizing it — holding a target-date fund and separate stock funds — which quietly pushes you far more aggressive than the target-date fund intended.
Sample splits by years to retirement
These are illustrations approximating the general shape of target-date glide paths and the age ranges in ourasset allocation by age guide. Providers differ, and your own numbers should reflect your risk tolerance and other assets.
| Time to retirement | Stocks | Bonds & cash | What's going on |
|---|---|---|---|
| 30+ years | 85–90% | 10–15% | Maximum runway; volatility is a feature, not a bug. |
| 20 years | 75–85% | 15–25% | Still growth-focused; begin thinking about the bond slice. |
| 10 years | 60–70% | 30–40% | Balances are large — a bad year now costs real money. |
| 5 years | 50–60% | 40–50% | Sequence-of-returns risk is at its peak. |
| At retirement | 40–55% | 45–60% | Fund several years of spending from stable assets. |
How to evaluate a target-date fund
- Check the glide path's endpoint. “To retirement” funds level off around the retirement date; “through retirement” funds keep reducing stocks for years afterward. Neither is right for everyone, but you should know which you hold.
- Compare stock share at your age. Funds with the same target year can hold noticeably different amounts of stock. Pick the one that matches the volatility you can tolerate.
- Look at the total expense ratio. Over decades, fees compound just as returns do.
- Know that it ignores you. A target-date fund assumes an average person retiring in that year. If you have a large pension, a spouse's assets, or unusual risk tolerance, an adjusted mix may serve you better.
Building your own mix
If you go DIY, start with the stock/bond split that fits your years to retirement and risk tolerance (the table above or therule of 110 gives a starting point). Then choose broad, low-cost funds to fill each slot — which specific funds is your decision; we never rank or recommend products. To turn your own answers into a personalized split across five asset classes, use the free calculator: it works for a 401(k) exactly as it does for an IRA, ISA, SIPP, or superannuation account, because the allocation question is identical.
Rebalancing inside a 401(k)
Because trades inside a 401(k) generally do not trigger capital-gains tax, this is one of the easiest accounts to rebalance. A common approach is to check once or twice a year and restore your target when any asset class has drifted about 5 percentage points. Many plans also offer automatic rebalancing — worth turning on. Directing new contributions to the underweight asset class is another way to rebalance without selling anything. Details in ourrebalancing guide.
401(k) allocation mistakes
- Sitting in the default cash or stable-value option for decades. Safe in the short run; costly in purchasing power over a long one.
- Owning a target-date fund plus other funds, unintentionally doubling up on stocks.
- Loading up on employer stock, concentrating career and retirement risk in a single company.
- Ignoring old accounts. A 401(k) left at a former employer can sit in a mix you chose 15 years ago.
- Stopping contributions when markets fall. Regular contributions buy more shares when prices are low.
Frequently asked questions
What is the best asset allocation for a 401(k)?
It depends mainly on how many years remain until you need the money. Someone 30+ years from retirement commonly holds around 85–90% stocks; someone 5 years out often holds around 50–60%. A target-date fund automates that shift; a DIY mix requires you to make and maintain the choice.
Should I put my 401(k) in a target-date fund?
A target-date fund is a reasonable default if you want a professionally designed glide path without maintaining it yourself: pick the fund matching your expected retirement year and it gradually becomes more conservative. Compare its fees and its stock share at each stage against what you would choose yourself, and remember that funds with the same target year can differ noticeably in risk.
Do I pay tax when I rebalance inside a 401(k)?
Generally no. Buying and selling inside a traditional or Roth 401(k) does not trigger capital-gains tax, which makes it one of the easier places to rebalance. Rules vary by plan and country, so check your plan documents or a tax professional.
How much company stock should I hold in my 401(k)?
A commonly cited guideline is to keep any single company’s stock — especially your employer’s — to a small share of your portfolio, often 10% or less. Your salary and your retirement savings already depend on the same company; concentrating further compounds the risk.
Does this apply to an IRA, ISA, SIPP, RRSP or superannuation?
Yes. Those accounts are tax-advantaged wrappers; the underlying allocation question — how much in stocks versus bonds versus cash — is the same whichever account holds the investments. Our calculator supports 29 countries for that reason.
Should I change my 401(k) allocation when the market drops?
Reacting to short-term moves is a common and costly mistake. Change your allocation when your goals, time horizon, or risk tolerance change — not because of headlines. If a drop leaves you unable to sleep, that is a sign your mix was more aggressive than your real risk tolerance, which is worth correcting deliberately rather than at the bottom.
Sources & further reading
Keep learning
- What Is Asset Allocation? A Plain-English GuideThe five asset classes, why the mix matters more than picking winners, and how to choose yours.
- Asset Allocation by Age: Stock & Bond Mix for Your 20s Through 70sTypical stock/bond ranges for every decade, plus a glide path table computed from our own model.
- Rule of 100, 110 and 120: How Much Should You Hold in Stocks?A live calculator for the age-based rules of thumb, and an honest look at their limits.
- The 60/40 Portfolio Explained: History, Pros, Cons & AlternativesWhy 60/40 became the default, what 2022 taught us, and when a different mix fits better.
- How Often Should You Rebalance Your Portfolio? Rules, Thresholds & a Worked ExampleCalendar vs threshold rebalancing, the 5% rule, and a worked example with real numbers.
- Asset Allocation in India: Equity, Debt & Gold by Age (Including NPS, EPF and PPF)Equity, debt and gold by age — and how EPF, PPF and NPS count toward your mix.
This guide is general education, not financial, investment, tax, or legal advice, and it does not recommend any specific security, fund, or product. Example percentages are illustrations, not recommendations for you. Past performance does not guarantee future results. Consider speaking with a licensed professional before making investment decisions. See ourmethodology anddisclaimer.