Serious Investing for Launch Years (Ages 18-24)

• Investment policy statement: At 18 the statement belongs to the investor, and the first draft is mostly about sequence and constraints. Common mistake: Copying an allocation from a parent or a template without writing down the reasons, so the first large market decline arrives with no record of why the portfolio was built that way.
• Research sleeve: From 18 to 24, a research sleeve competes with an emergency fund, student loan payments and a first employer plan for the same scarce dollars. Common mistake: Funding a sleeve from money earmarked for a first-job retirement contribution or loan payment, then selling at a loss when a rent, tuition or car repair bill arrives.
• Concentration management: Ages 18 to 24 often bring a first employer plan, and a default target-date or index fund is typically broadly diversified. Common mistake: Treating a newly inherited custodial account as house money and leaving it in the single stock the adults chose, instead of reviewing it once it legally became the owner's own.
• Tax location: Ages 18-24 add a first workplace plan, often with a Roth 401(k) option beside the traditional one, and a UGMA/UTMA balance that becomes fully the person's own at the age of majority, 18 to 21. Common mistake: Spending effort on placement rules for a few thousand dollars while leaving part of the employer match unclaimed, a far larger effect than any choice of which asset sits in which account.
• Rebalancing: In the 18 to 24 range rebalancing is cheapest when it is least needed: balances are small, contributions are frequent, and a workplace plan or target-date fund may do the work automatically. Common mistake: Combining a target-date fund with separate stock and bond funds in one account and then rebalancing the pieces, which duplicates the fund's own glide path and undoes its intended allocation.
• Scenario testing: At 18 to 24, the most informative scenario is often a job loss or a gap in income, because it tests whether savings, loan payments and retirement contributions can continue. Common mistake: Stress-testing only the investment balance and leaving out job loss, so the plan looks fine on paper but the first forced withdrawal comes from a traditional retirement account with a 10% additional tax.
• Security research: Ages 18-24 bring the first fully owned accounts: a UGMA/UTMA balance transfers at the age of majority, and a first 401(k) opens with its own fund menu. Common mistake: Spending hours on a single stock while never opening the employer plan's fund list to compare expense ratios, even though that menu receives most of each paycheck's contribution.
• Exit rules: Ages 18 to 24 bring the first exit decision that really matters: leaving a job and choosing what to do with a small 401(k) balance. Common mistake: Cashing out a small 401(k) after leaving a first job, overlooking that income tax and the 10% additional tax shrink the balance and remove years of compounding for a modest short-term gain.

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