How to Set Asset Allocation by Age and Goals

An asset allocation is best set goal by goal, not by age alone. Each goal gets a mix that fits its time horizon, the return it needs and the loss it can absorb; the household mix is what those choices add up to, written down as a target with a tolerance range and review triggers. Age rules and target-date funds are reference points that ignore pensions, job risk and near deadlines.

Key takeaways

The SEC's investor site names time horizon and risk tolerance as the main inputs; risk tolerance covers both ability and willingness to lose money.
The 100-, 110- and 120-minus-age rules give a 50-year-old 50%, 60% or 70% in stocks.
In an illustrative three-goal household at 64% stocks, 2008 cost $64,030 either way, but per-goal mixes left the house money up $560 instead of down $7,318.
The worst calendar year since 1928 cost $71,164 on $200,000 at 80/20, $54,652 at 60/40 and $38,141 at 40/60; in 2022 all three lost about $36,000.
The asset-location studies cited put taxable bonds and actively managed stock funds in tax-deferred accounts, and passive stock index funds in taxable ones.

Four inputs that set the mix

Investor.gov, the SEC's investor education site, calls the asset allocation decision a personal one that depends on time horizon and risk tolerance. Its beginners' guide to asset allocation adds that no single model is right for every financial goal. Split into four, those inputs become usable:

Time horizon per goal. Three goals mean three horizons.
Need for return. The growth a goal requires, given savings to date and to come. The CFA Institute's guide to investment policy statements for individuals (May 2010) lists it as a separate element.
Ability to bear loss. How much a fall would damage the plan, given income, liquidity needs and other assets.
Willingness to bear loss. How large a fall the investor can watch without selling.

Ability and willingness can disagree

FINRA's Report on Digital Investment Advice (March 2016) calls the third input risk capacity and the fourth risk willingness, and says broker-dealers must consider both. A 25-year-old saving for retirement likely has more capacity than one funding graduate school in three years; problems arise when willingness exceeds capacity. FINRA's Know Your Risk Tolerance (October 2024) adds the reverse: the risk a person can afford is not necessarily the risk they are comfortable taking.

Wages, pensions and Social Security

The CFA Institute Research Foundation book Lifetime Financial Advice (Ibbotson, Milevsky, Chen and Zhu, 2007) treats future earnings, or human capital, as an asset with its own risk. A tenured professor's salary and pension behave like an inflation-adjusted bond, so the portfolio has little need for bonds. A stockbroker's pay already moves with the market, so the book recommends a smaller stock share for the stockbroker than for a schoolteacher with the same wealth and risk tolerance. It also describes Social Security, from the recipient's side, as an inflation-indexed life annuity.

Illustrative example: a 70-year-old has $500,000 invested at 40% stocks and 60% bonds, plus Social Security of $24,000 a year that rises with inflation. Valued as 25 years of payments at an assumed 2% real discount rate, the benefit is worth about $469,000, so stocks are about 21% of total resources ($200,000 of $968,563), not 40%. The benefit cannot be sold, so this is a way of seeing risk, not a market value.

What the age rules really imply

The "100 minus age", "110 minus age" and "120 minus age" rules set the stock percentage from age alone:

Age	100 minus age	110 minus age	120 minus age
30	70% stocks	80% stocks	90% stocks
50	50% stocks	60% stocks	70% stocks
70	30% stocks	40% stocks	50% stocks

The rules disagree by 20 percentage points at every age, as much as the 100-minus rule moves between 50 and 70. They give a house deposit due next year the same mix as retirement savings, and they ignore the job that pays the bills and Social Security, which in the example above cut the stock share of total resources from 40% to about 21%. The authors of Lifetime Financial Advice put it bluntly:

"simplistic rules like '100 minus age should be invested in equities' have no room in a sophisticated, holistic framework of wealth management." (Ibbotson et al., 2007)

How fund glide paths compare

Target-date funds use a more detailed age schedule, a glide path, that cuts the stock share as the target year approaches. Three fund families' prospectuses, shown as dated examples rather than recommendations, show how much these differ.

Fund series	Stocks, 2045 fund	Stocks at the target date	When the shifting stops
Vanguard Target Retirement	83.5% (Sept. 30, 2025)	50.7% in the 2025 fund (Sept. 30, 2025)	Within seven years after the target date, when the mix should resemble the Income Fund (31.4% stocks)
T. Rowe Price Retirement	93.4% neutral allocation (Aug. 1, 2026)	55% neutral allocation	About 30 years after the target date
Fidelity Freedom Index	Shown only as a chart; a revised allocation is due to take effect by the end of the first quarter of 2027	Shown only as a chart	About 15 to 20 years after the target date

Sources: Vanguard summary prospectuses for the 2045 Fund, 2025 Fund and Income Fund (January 28, 2026); T. Rowe Price Retirement 2045 Fund summary prospectus (August 1, 2026); Fidelity Freedom Index 2045 Fund summary prospectus (May 30, 2026). Stock figures add U.S. and foreign stocks.

Vanguard's 2045 fund held 83.5% in stocks while T. Rowe Price's 2045 glide path sets a neutral 93.4%, and the shifting stops anywhere from within 7 to about 30 years after the target date. As FINRA's target-date fund explainer notes, none of these schedules takes the holder's other assets, situation or risk tolerance into account.

One household, three goals

Treating each goal as its own sub-portfolio has a formal basis: Das, Markowitz, Scheid and Statman's "Portfolio Optimization with Mental Accounts" (Journal of Financial and Quantitative Analysis, 2010) defines each account's risk as the probability of missing its goal, lets risk attitudes differ by account, and shows the combined portfolio stays mean-variance efficient when short selling is allowed. FINRA's page on asset allocation and diversification gives the everyday version: more cash for a down payment, more stocks for retirement decades away. The household mix is a weighted sum:

Household stock % = Σ (goal balance × goal stock %) ÷ Σ goal balances

goal balance  = dollars set aside for that goal today
goal stock %  = share of that goal's money held in stocks
Σ             = sum across all goals

Illustrative example: age 45, three dates

The per-goal mixes are illustrative assumptions, not recommendations. Returns are 2008 figures from Aswath Damodaran's historical returns data set (updated January 2026): S&P 500 with dividends −36.6%, 10-year Treasury bond +20.1%, 3-month Treasury bills +1.4%.

Goal	Years away	Balance	Assumed mix	2008 return	Dollar change
Retirement	20	$250,000	80% stocks, 20% bonds	−25.2%	−$63,054
College	8	$60,000	40% stocks, 60% bonds	−2.6%	−$1,536
House deposit	3	$40,000	Treasury bills	+1.4%	+$560
Household		$350,000	64% stocks, 24.6% bonds, 11.4% cash	−18.3%	−$64,030

The stock share is ($200,000 + $24,000 + $0) ÷ $350,000 = 64%, close to "110 minus age" at 45 (65%), but reached from the goals. Holding that same 64/24.6/11.4 mix in every pot would have produced the same $64,030 total loss, but the house deposit would have fallen by $7,318 to $32,682 instead of rising to $40,560. Per-goal mixes do not reduce the household's loss; they keep it away from the goal with the nearest deadline.

Turning willingness into dollars

Questionnaires, the usual tool for willingness, are weak. Joachim Klement's CFA Institute brief "Investor Risk Profiling: An Overview" (2015) reports that questionnaires typically explain less than 15% of the differences in risky-asset holdings between investors, and cites a review of 131 US questionnaires in which 35% never asked about time horizon. In his experiment, people shown a loss as $1 million of $10 million sold about one-third more often than people shown the same loss as a percentage, so percentage questions likely understate loss aversion.

The table therefore puts losses in dollars. It applies the worst calendar years in the Damodaran data (1928–2025) to $200,000, assuming the mix of S&P 500 stocks and 10-year Treasury bonds is rebalanced every January, with no fees or taxes.

Stocks/bonds	Worst year	Loss on $200,000	2008	2022	Losing years of 98
80/20	1931: −35.6%	−$71,164	−$50,443	−$35,991	25
60/40	1931: −27.3%	−$54,652	−$27,782	−$35,908	21
40/60	1931: −19.1%	−$38,141	−$5,120	−$35,824	20

Moving from 80/20 to 40/60 cut the 2008 loss by about $45,000, but in 2022, when stocks and Treasury bonds both fell about 18%, all three lost about $36,000. Calendar years also hide losses that span two years or peak mid-year, so these figures are a floor, not a ceiling. If a loss in this table would have prompted a sale, the willingness input points below that mix, whatever the age rule says.

Placing assets across accounts

Allocation is what is owned; location is which account holds it. A claim still repeated online puts growth stocks in tax-deferred accounts and steadier assets in taxable ones, to keep required distributions down. The studies cited here point the other way. Shoven and Sialm's "Asset location in tax-deferred and conventional savings accounts" (Journal of Public Economics) finds the preferred home for taxable bonds is the tax-deferred account. Tax-efficient stock funds such as passive index funds belong in the taxable account, as do municipal bonds when the bracket is high enough, while tax-inefficient, actively managed stock funds belong in the tax-deferred account. An NBER study by Bergstresser and Poterba (2002), using 1998 survey data, found many households did the reverse, and that most could have cut their taxes by moving heavily taxed fixed income into tax-deferred accounts.

The tax rules explain why. Bond interest is taxed at ordinary rates each year. Long-term gains, on assets held more than a year, and qualified dividends are taxed at 0%, 15% or 20% depending on taxable income, according to IRS Topic 409 and Topic 404; higher-income investors may also owe the net investment income tax. Gains are taxed only when the asset is sold. Withdrawals from a traditional IRA are taxed as ordinary income, apart from any nondeductible contributions, under IRS Publication 590-B, so stock gains held there are eventually taxed at ordinary rates. The answer still depends on brackets, yields and account types; Roth accounts differ again, as qualifying withdrawals are untaxed. Location changes after-tax results, not the allocation, which is counted across all accounts combined.

Writing the target down

Three items from the CFA Institute's investment policy statement (IPS) guide turn an allocation into something that can be followed.

A target with a range. The guide calls for a target for each asset class with allowable ranges around it. Illustrative example: a 64% stock target with a 5-point band runs from 59% to 69%; a 25% stock rally with flat bonds and cash would push 64% to about 69%, the edge of the band. The site's Rebalancing calculator shows the trades needed to return to a target.
A rebalancing rule. The guide says the boundaries that trigger rebalancing, or a decision not to rebalance, should be documented.
Review triggers. Investor.gov's guide says the most common reason to change an allocation is a change in time horizon, and adds changes in risk tolerance, financial situation or the goal itself. The IPS guide asks for the review process to be set out in advance; its sample policy calls for a review at least once a year.

The IPS guide notes that risk tolerance is hard to assess for individuals. One sample clause states the largest tolerable loss in any 12-month period as a percentage; a dollar figure from the table above can serve the same purpose.

Frequently asked questions

Are free online risk questionnaires neutral?

Not necessarily. Investor.gov warns that their results may be biased toward products sold by the sites' sponsors. Klement's brief also cites a study in which 11% of questionnaires simply asked investors to pick their own risk profile or portfolio.

What happens when a target-date fund reaches its date?

Less than the name suggests. FINRA's target-date fund explainer notes that reaching the target date does not mean enough has been saved for the goal. If the fund merges into another, FINRA suggests reading the new fund's prospectus.

How long must a stock be held for its dividends to be qualified?

IRS Publication 550 sets the general rule: the stock must be held for more than 60 days during the 121-day period that begins 60 days before the ex-dividend date. A dividend shown in box 1b of Form 1099-DIV still needs the shareholder to meet that holding period. Capital gain distributions and "dividends" on bank or credit union deposits are never qualified.

How often should an allocation be rebalanced?

Investor.gov's beginners' guide describes two approaches: on a calendar, such as every six or twelve months, or when an asset class drifts by more than a percentage set in advance. Either way, rebalancing tends to work best when done relatively infrequently. Selling at a gain in a taxable account is taxed; trades inside a traditional IRA trigger no tax until money is withdrawn.

What should happen when risk answers contradict each other?

FINRA's 2016 report says firms should reconcile contradictory answers through discussion or follow-up questions. It called averaging them a poor practice, because the result can exceed the customer's tolerance. If answers are not reconciled, taking the more conservative one is better, though it can still miss the intended level of risk.

A one-page allocation worksheet

List each goal with its date, today's balance and the amount still to be added.
Note bond-like income (a stable salary, a pension, Social Security) and income that moves with markets.
Pick a mix for each goal, soonest goal first, and check it against the dollar losses above.
Compute the household mix with the weighted-sum formula; use the age rules only as a cross-check.
Then decide which account holds each asset, keeping the combined percentages unchanged.
Write down the target, the band, the rebalancing rule and the events that trigger a review, and date the page. The site's Investment Growth calculator can test whether each goal reaches its amount under an assumed return.