A parent called me last spring with a question I hear constantly: “My daughter just turned 22, has her first real job, and I want to help her start a Roth IRA. Where should she open it?” Choosing a Roth IRA for an adult child sounds simple, but the differences between brokerages — fees, minimums, fund selection, and platform experience — can meaningfully affect decades of compounding growth. In my practice as a fee-only financial planner, I have helped over 200 families navigate exactly this decision, and the right answer genuinely depends on your child’s situation.
Adult children have a distinct advantage over minors here: they can open and own their own Roth IRA directly, without a custodial arrangement. No UGMA or UTMA complexity, no transfer-at-majority paperwork, no custodian approval required. The account is theirs from day one. That simplicity makes this a perfect time to get started — and to get it right.
Why the Brokerage Choice Matters More Than Most People Think
Most parents assume all Roth IRAs are essentially the same. They are not. The fund expense ratios, account minimums, and available investment options vary enough to cost a young investor tens of thousands of dollars over a 40-year horizon. A 0.50% expense ratio difference on a $7,000 annual contribution compounded over 40 years is not trivial — we are talking about a six-figure gap at retirement.
In my experience, the families who spend 30 minutes comparing brokerages upfront almost always end up in a better long-term position than those who just click “open account” at whatever name they recognize. That said, the best brokerage is the one your child will actually use — so platform experience and simplicity matter too.
2024 and 2025 Roth IRA Rules Your Adult Child Needs to Know
Before comparing brokerages, let me cover the ground rules. For both 2024 and 2025, the Roth IRA contribution limit is $7,000 per year for individuals under age 50. Your adult child must have earned income equal to or greater than the amount they contribute. Wages, salaries, freelance income, and self-employment income all qualify. Investment income does not.
Income phase-outs also apply. For 2025, single filers begin losing Roth IRA eligibility at a modified adjusted gross income (MAGI) of $150,000, with full phase-out at $165,000. If your adult child earns above those thresholds, a backdoor Roth IRA strategy may be appropriate — but that is a separate conversation. Most 22- to 30-year-olds I work with fall well under the phase-out range.
One clarification I make with every family: a parent can gift money to an adult child to fund the contribution. However, the child must have earned income to justify the contribution. You cannot contribute on their behalf if they had zero earnings that year.
Choosing a Roth IRA for an Adult Child: The Top Brokerages Compared
Here is how the major platforms stack up based on my direct experience helping families open accounts. I have personally evaluated each of these platforms, and in several cases, I have used them for my own children’s accounts as well.
Fidelity
Fidelity is my most frequent recommendation for young adult investors. There is no account minimum, no annual fee, and their proprietary index funds — the Fidelity ZERO series — carry a 0.00% expense ratio. That is not a rounding error. Their total market index fund (FZROX) and international index fund (FZILX) are genuinely free to hold.
The platform is clean, the mobile app is solid, and customer service is consistently excellent. One family I worked with had their 23-year-old daughter open a Fidelity Roth IRA in under 15 minutes using just her phone. Fractional shares are available, which matters when your adult child is starting with a small initial deposit. Fidelity also offers a strong educational library, which helps new investors understand what they own.
Vanguard
Vanguard pioneered low-cost index investing and remains a gold standard for serious long-term investors. Their index funds carry expense ratios as low as 0.03% to 0.04%. However, Vanguard has historically required a $1,000 minimum to open a position in their mutual funds. ETF versions of their funds have no minimum beyond the share price.
The platform’s interface is functional but dated compared to Fidelity or Schwab. Specifically, younger investors often find the UX less intuitive. That said, Vanguard’s ownership structure — owned by its funds, which are owned by investors — creates an inherent alignment with long-term, low-cost investing that I respect deeply. For a disciplined adult child who will not be checking their account constantly, Vanguard is an excellent fit.
Charles Schwab
Schwab offers no account minimum, no annual fee, and their Schwab Market Cap Index funds carry expense ratios around 0.03%. Their platform is polished and modern. Schwab also offers excellent branch access across the country, which some families value. Fractional shares are available through their “Schwab Stock Slices” program for equities, though not for all ETFs.
In my experience, Schwab works particularly well for adult children who want a combination of index fund simplicity and the option to explore individual stocks later. The trading tools are more robust than Fidelity’s basic interface without being overwhelming.
Betterment and M1 Finance (Robo-Advisor Options)
For adult children who want a fully automated approach, Betterment and M1 Finance are worth mentioning. Betterment charges 0.25% annually on assets managed. M1 Finance is free for standard accounts. Both build diversified portfolios automatically.
However, I typically steer families away from the 0.25% Betterment fee when free alternatives exist. Over 40 years on a growing Roth IRA balance, that 0.25% adds up significantly. M1 is a more competitive option, though it lacks the customer support infrastructure of Fidelity or Schwab.
Brokerage Comparison Summary
Here is a quick-reference breakdown of the platforms I covered:
- Fidelity: $0 minimum | $0 annual fee | 0.00% expense ratio (ZERO funds) | Excellent app | Best for beginners
- Vanguard: $1,000 minimum (mutual funds) | $0 annual fee | 0.03–0.04% expense ratios | Dated interface | Best for disciplined long-term investors
- Schwab: $0 minimum | $0 annual fee | ~0.03% expense ratios | Modern platform | Best for those wanting growth flexibility
- Betterment: $0 minimum | 0.25% annual fee | Automated portfolios | Best for truly hands-off investors who accept the fee
- M1 Finance: $100 minimum | $0 fee (standard) | Automated “pie” portfolios | Best for automation without the fee
What to Actually Invest In Once the Account Is Open
Opening the account is only half the battle. I cannot count how many times a family has come to me after their adult child opened a Roth IRA — and left the entire balance sitting in cash for two years. The account must be invested to grow.
For most young adult investors, a simple three-fund portfolio works extremely well inside a Roth IRA. That typically means a total US stock market index fund, a total international stock index fund, and a bond index fund — weighted by age and risk tolerance. At age 22 to 30, most advisors lean heavily toward equities, often 90% or more.
ETFs deserve particular attention here. They trade like stocks, have no investment minimums beyond the share price, and often carry some of the lowest expense ratios available. A common question I get is whether to use mutual funds or ETFs inside a Roth IRA. For young investors just starting out, ETFs often win on accessibility and cost. That said, Fidelity’s ZERO mutual funds are a legitimate exception to that rule.
For families who want their adult child to understand what they own — not just auto-invest and forget — I often recommend picking up a solid foundational resource. One book I regularly point clients toward is 401(k)s & IRAs For Dummies. It covers contribution rules, investment strategies, traditional vs. Roth comparisons, and distribution rules in clear, jargon-free language. I have recommended it to dozens of families over the years because it gives young investors a complete picture — not just the mechanics of opening an account, but the “why” behind each decision.
If your adult child specifically wants to go deeper on ETF selection — understanding expense ratios, dividend ETFs, sector funds, and portfolio construction — I also suggest pairing that with ETF Investing For Beginners. It is a practical, step-by-step guide that complements the broader IRA education well. Together, these two resources cover nearly every question a new Roth IRA investor is likely to have.
Setting Up the Account: What the Process Actually Looks Like
Many parents worry that opening a Roth IRA is complicated. In reality, the process at Fidelity, Schwab, or Vanguard takes about 15 to 20 minutes online. Here is what your adult child will need:
- Social Security number
- Government-issued ID (driver’s license or passport)
- Bank account and routing number for the initial transfer
- Estimated annual income (to confirm Roth IRA eligibility)
- Beneficiary designation (often overlooked — do not skip this)
Once the account is open and funded, your adult child must actively select investments. The transfer typically clears in one to three business days. After that, they choose their funds and submit the trade. Most platforms now offer a guided investment selection flow for new account holders, which reduces the intimidation factor significantly.
As a result of automation improvements at major brokerages, parents can sometimes gift the initial deposit and walk through the setup together virtually — a meaningful financial literacy moment for the whole family.
Who This Strategy Works Best For — and Who Should Look Elsewhere
A Roth IRA at Fidelity or Schwab is an excellent fit for an adult child who has earned income, falls under the income phase-out limits, and wants decades of tax-free compound growth. It is also ideal for parents who want to gift money toward their child’s financial future in a structured, tax-advantaged way.
However, this approach is not for everyone. If your adult child has no earned income that year, they cannot contribute to a Roth IRA — period. If they are a high earner approaching the phase-out thresholds, a backdoor Roth strategy or traditional IRA may be more appropriate. Additionally, if they have high-interest debt — credit cards, personal loans — paying that down often takes priority over IRA contributions from a pure financial planning perspective.
Specifically, I caution parents against funding a Roth IRA for an adult child who has not yet built a basic emergency fund. The ideal sequence is typically: emergency fund first, high-interest debt second, then retirement accounts. That context matters.
The Reference Guide I Hand to Parents Opening Their Child’s First Roth
After you’ve chosen a brokerage, your child needs to understand the rules they’re actually following — contribution limits, earned income requirements, withdrawal penalties, and how a Roth differs from a traditional IRA. This book fills that gap with clarity and examples, without getting lost in edge cases.
What works
- Explains the earned income requirement and how to document it — critical for young workers and parents co-opening an account.
- Covers the contribution vs. earnings withdrawal rules with clear examples, so your child doesn’t accidentally trigger a tax bill or penalty.
- Walks through the mechanics of opening and funding an IRA and choosing investments, bridging the gap between “pick a brokerage” and “now what do I actually do?”
What doesn’t
- Doesn’t compare specific brokerages or dive into fee structures — you’ve already done that work in the main post.
- Doesn’t address custodial Roth IRAs for minors or backdoor conversions, which are beyond the scope of a young adult’s first account.
If your child is already investing regularly or you’re looking for deep tax strategy, this is foundational reading rather than advanced. 401(k)s & IRAs For Dummies
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