# What is asset allocation, and how do you pick yours?

> Asset allocation is your split between stocks, bonds and cash, set by your deadline and how much risk you can handle.

Source: https://www.walletprep.com/learn/asset-allocation/ · Updated 2026-10-04 · Investing

Asset allocation is how you split your investments between stocks, bonds and cash. Pick it from when you need the money and how big a drop you can sit through, then write it down as percentages, like 80% stocks and 20% bonds.

## Key facts
- **It is a split by percentage.** You describe your allocation as percentages of the total, like 70% stocks, 25% bonds and 5% cash. The dollar amounts follow from the percentages.
- **Two questions set it.** Your time horizon is how long until you need the money. Your risk tolerance is how much loss you can accept, both in money and in nerves, in exchange for more growth.
- **More stocks means a bumpier ride.** Stocks have more growth potential over long periods but can drop sharply. Bonds usually swing less and grow less. Cash is steady but can lose value to inflation.
- **It drifts, so you rebalance.** When stocks rise faster than bonds, your stock share grows past your target. Rebalancing means shifting back, by moving money or by aiming new deposits at the part that fell behind.

## Start with when you need the money
Your time horizon is the number of years until you plan to spend the money. With a long horizon, you have time to wait out bad years, so you can hold more stocks. With a short one, a drop could land right when you need the cash.
A simple rule that works for most goals is to keep money you need within about 5 years in savings, a CD or short-term bonds. Money you won't touch for 10 or more years can lean heavily on stocks. In between, a mix of both is common.

## Then decide how much drop you can take
Risk tolerance is part ability and part nerve. Ability is whether a drop would actually hurt your plans, which depends on your emergency fund, job security and other savings. Nerve is whether you would hold on or sell in a panic.
Try a stress test. Multiply your stock dollars by 30%, a large but realistic drop for a bad stretch. If seeing that loss on your statement would push you to sell, choose a lower stock share. A mix you can keep through a crash beats a bolder one you abandon.

## Rough starting points
There is no single right answer, but common starting points look like this. With 25 or more years to go, 80% to 90% stocks. With 10 to 25 years, 60% to 80% stocks. Under 10 years, gradually less, with more in bonds and cash as the date nears.
One old rule of thumb says your stock share should be about 110 minus your age, so 81% stocks at 29. It is a starting point, not a rule. Your income, other assets and comfort with risk matter more than a formula.

## One goal, one mix
You can have different allocations for different goals at the same time. Retirement money 35 years away might be 90% stocks while a house fund for next year is all cash. Mixing the two into one pot leads to a bad mix for both.
Within each goal, count all the accounts that serve it. If your 401(k) is 100% stocks and your IRA is 100% bonds, your retirement allocation is whatever the two add up to.

## The easy way to hold your mix
You need only two or three funds: a broad stock index fund (or one US and one international), and a broad bond index fund. Put each fund's share of your money in it and you are done.
Or let one fund do it. A target-date fund or a balanced fund holds a set mix of stocks and bonds and rebalances for you. If you use one, keep it as your only fund in that account, so the mix stays the one it was built to hold.

## A worked example: Nia turns 80/20 into dollars
Nia, 29, has $15,000 for retirement across her 401(k) and IRA. She has an emergency fund and 35 years to go. She picks 80% stocks and 20% bonds, with 30% of her stocks international.

- Total invested: $15,000
- Bonds (20%): −$3,000
- Stocks (80%): = $12,000
- International (30% of stocks): −$3,600
- US stocks: = $8,400
- Paper loss if stocks fall 30%: $3,600

1. $15,000 × 20% = $3,000 goes to a bond index fund, leaving $15,000 − $3,000 = $12,000 for stocks.
2. Of the stocks, $12,000 × 30% = $3,600 goes international and $12,000 − $3,600 = $8,400 to a US stock index fund.
3. Stress test: a 30% stock drop means $12,000 × 30% = $3,600 lost on paper. Nia decides she could hold through that, so 80/20 stays.

### What $300 a month grows to over 30 years at a few assumed yearly returns (returns vary and can be negative)

| Annual return | Balance after 30 years | Of which growth |
| --- | --- | --- |
| 3% | $174,821 | $66,821 |
| 5% | $249,678 | $141,678 |
| 7% | $365,991 | $257,991 |

## Common mistakes
- **Holding stocks for a short goal.** Money for a down payment next year doesn't belong in stocks. A 20% drop right before you buy could cost you the house or months of delay.
- **Being too cautious for decades.** Keeping 35-year retirement money all in cash feels safe, but inflation slowly shrinks what it buys. Long-term money usually needs some growth to keep up.
- **Changing the mix after a drop.** Cutting stocks after the market falls sells low and often misses the recovery. Change your allocation only when your goals or timeline change.

## Questions people ask
### What is a good asset allocation for a 30-year-old?
Many people with 30 or more years until retirement hold 80% to 90% stocks, with the rest in bonds. That assumes an emergency fund is already in place and you can sit through drops. A lower stock share is fine if big swings would make you sell.

### What does 60/40 mean?
It means 60% stocks and 40% bonds. It is a common moderate mix. On $10,000, that is $6,000 in stocks and $4,000 in bonds.

### Is asset allocation the same as diversification?
They are related. Asset allocation is the split between types like stocks and bonds. Diversification is spreading money within and across those types, such as owning thousands of companies instead of a few.

### How often should I change my asset allocation?
Rarely. Rebalance back to your target about once a year. Change the target itself when your goal, timeline or life changes, such as getting within 10 years of retirement.

## Do this today
Add up what you have in stocks, bonds and cash across all your retirement accounts and divide each by the total. Compare those percentages with the mix you want, and write your target down.

## Sources
- [Investor.gov (SEC): Asset Allocation](https://www.investor.gov/introduction-investing/getting-started/asset-allocation)
- [SEC: Beginners' Guide to Asset Allocation, Diversification, and Rebalancing](https://www.sec.gov/about/reports-publications/investorpubsassetallocationhtm)
- [FINRA: Asset Allocation and Diversification](https://www.finra.org/investors/investing/investing-basics/asset-allocation-diversification)

_General education, not personalized financial, tax or legal advice. Figures are examples. Check current rates and limits before you act._