Best Robo-Advisors for a Roth IRA, and What Changes in One
Last updated August 2026
Short answer
A Roth is the account where a robo-advisor's premium tax tier is worth the least: there are no taxable gains to harvest and qualified withdrawals are already tax-free, so tax-loss harvesting and direct indexing do nothing. What is left doing work is total cost, the glide path, and whether the platform also offers a traditional IRA at the same custodian in case you ever need a backdoor contribution. Fidelity Go opens one at zero cost below its threshold, Vanguard Digital Advisor has the lowest fee actually charged, and Betterment has the strongest glide path. Walnut is not a robo-advisor and is not an investment adviser.
The useful thing to know before comparing platforms for a Roth is that most of what they compete on is switched off in this account. Half the feature list exists to manage taxable gains, and a Roth does not have any. That narrows the comparison considerably, and it narrows it toward the variables that compound over what is often the longest-held account a person owns.
What is worth what, inside a Roth
| Feature | Worth in a Roth | Why |
|---|---|---|
| Tax-loss harvesting | Nothing | No taxable gains exist in a Roth to offset |
| Direct indexing | Nothing | Its purpose is managing taxable gains |
| Tax-coordinated asset location | Something, indirectly | Only if the platform also holds your other account types |
| The glide path | A great deal | A Roth is often the longest-horizon account someone owns |
| Low total cost | A great deal | It is the main thing left that compounds over 30 years |
| Automatic rebalancing | A great deal | Rebalancing inside a Roth triggers no tax at all, so it is frictionless |
The first two rows are the reason to compare base tiers rather than premium ones here. If a platform's higher tier is priced around tax management, it is priced around something your account cannot use.
The platforms, on what applies to a Roth
| Option | Roth support | Where it falls short |
|---|---|---|
| Fidelity Go | Roth IRAs supported with no minimum to open and no advisory fee below a balance threshold | The advisory fee begins above the threshold, so it is free while the balance is small rather than forever. |
| Betterment | Roth, traditional and SEP IRAs, with goal-based allocation and a retirement-date glide path | You pay the standard rate for tax features that are inert in a Roth, which is most of what the fee funds. |
| Wealthfront | Roth, traditional and SEP IRAs, plus strong long-horizon projections | Direct indexing and the deeper tax tooling are taxable-account features, so a Roth-only user pays for less. |
| Vanguard Digital Advisor | Roth and traditional IRAs on low-cost index funds at a very low all-in fee | An account minimum, and thinner tooling than the pricier platforms. |
| Keep your own broker (not a robo-advisor) | Whatever Roth IRA you already hold, at your existing broker | No glide path and no rebalancing. Over a 30-year Roth that is a long time for drift to accumulate, which is why this sits fifth here. |
| SoFi Robo Investing | Roth, traditional and SEP IRAs at a very low minimum, historically with no management fee | Thinner retirement planning, and free-tier terms in this category have changed before. |
How this was ranked
On total cost, the strength of the glide path over a long horizon, the minimum to open, and whether the platform offers a traditional IRA alongside the Roth at the same custodian. Tax features are excluded from the ranking entirely, because they cannot operate in this account.
To be upfront, since this is our site: the fifth entry is Walnut's category and is not a robo-advisor. A Roth is frequently the longest-horizon account someone holds, which makes decades of unmanaged drift a real cost, and keeping your own broker means nobody manages it. On a ranking by cost the same option is first; here it is fifth.
1. Fidelity Go
Roth support. Roth IRAs supported with no minimum to open and no advisory fee below a balance threshold
Backdoor contributions. Both account types available at the same custodian, which is what a backdoor contribution needs
Best for. Opening a Roth at genuinely zero cost, and having the traditional IRA alongside it if you later need one
Where it falls short. The advisory fee begins above the threshold, so it is free while the balance is small rather than forever.
2. Betterment
Roth support. Roth, traditional and SEP IRAs, with goal-based allocation and a retirement-date glide path
Backdoor contributions. Supports holding both account types, though the conversion step is yours to initiate
Best for. A Roth being funded steadily toward a retirement date, where the glide path does real work over decades
Where it falls short. You pay the standard rate for tax features that are inert in a Roth, which is most of what the fee funds.
3. Wealthfront
Roth support. Roth, traditional and SEP IRAs, plus strong long-horizon projections
Backdoor contributions. Both account types supported; you initiate the conversion
Best for. People who find the compounding projections motivating on an account they will not touch for decades
Where it falls short. Direct indexing and the deeper tax tooling are taxable-account features, so a Roth-only user pays for less.
4. Vanguard Digital Advisor
Roth support. Roth and traditional IRAs on low-cost index funds at a very low all-in fee
Backdoor contributions. Both account types available at the same custodian
Best for. A long-horizon Roth where minimising the fee is the whole point, since nothing else on the fee is doing work
Where it falls short. An account minimum, and thinner tooling than the pricier platforms.
5. Keep your own broker (not a robo-advisor)
Roth support. Whatever Roth IRA you already hold, at your existing broker
Backdoor contributions. Entirely up to you, and most large brokers support both account types
Best for. Someone who already has a Roth and wants to understand what is in it rather than have it replaced
Where it falls short. No glide path and no rebalancing. Over a 30-year Roth that is a long time for drift to accumulate, which is why this sits fifth here.
6. SoFi Robo Investing
Roth support. Roth, traditional and SEP IRAs at a very low minimum, historically with no management fee
Backdoor contributions. Both account types available
Best for. A first Roth opened alongside banking, where simplicity matters more than tooling
Where it falls short. Thinner retirement planning, and free-tier terms in this category have changed before.
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Two Roth-specific things to check before you open one
Whether you can contribute directly at all. Eligibility to contribute to a Roth phases out above certain income levels, and the annual contribution limit is adjusted over time. Both change, so check the current year's figures rather than any page's stated numbers. See Roth IRA contribution limits.
Whether the platform offers a traditional IRA too. If your income means a direct contribution may be limited now or later, the backdoor route needs both account types, ideally at the same custodian. It costs nothing to choose a platform that keeps that option open, and it is awkward to fix afterwards. See the backdoor Roth explained.
Why a Roth changes what you should hold, not just where
There is a second-order point worth knowing once you hold both account types. Because a Roth grows and is withdrawn tax-free, it is generally the account you want holding whatever you expect to grow most over the longest period, since that growth escapes tax entirely. A traditional account, taxed on withdrawal, is a more natural home for the steadier, income-producing part of a portfolio.
Robo-advisors mostly do not do this for you. Each account gets its own risk questionnaire and its own model allocation, so you can end up holding a near-identical mix in both, which wastes the Roth's advantage. The platforms that coordinate across accounts do it only for the accounts they hold.
If your Roth and your other accounts are in different places, this is a decision you make rather than buy. See tax-efficient investing and asset allocation models.
Related decisions
If you are choosing across retirement accounts generally rather than a Roth specifically, best robo-advisors for retirement covers the glide path question in full. If the money is coming from a workplace plan, see the rollover comparison. And the general criteria are in the seven checks.
FAQ
Should a Roth hold different investments from my other accounts?
Generally yes, and most platforms will not do it for you. Because a Roth grows and is withdrawn tax-free, it is the natural home for whatever you expect to grow most over the longest period. Each account getting its own questionnaire and its own model allocation is how people end up holding a near-identical mix in both and wasting the Roth's advantage.
Is a Roth the best account to be aggressive in?
It is the account where long-term growth is worth the most, because none of it is taxed on the way out. That is an argument about asset location rather than about taking more risk overall: the total risk across your accounts should still match your tolerance, with the highest-growth part of it sitting in the Roth.
What is the best robo-advisor for a Roth IRA?
Fidelity Go for opening one at genuinely zero cost below its balance threshold. Vanguard Digital Advisor if you want the lowest fee that is actually charged, which matters because cost is one of the few things still doing work in a Roth. Betterment if you want a goal-based glide path toward a retirement date. All three support Roth accounts; the differences are cost and how much the allocation de-risks over time.
Does tax-loss harvesting work in a Roth IRA?
No. Tax-loss harvesting realises losses to offset taxable gains, and a Roth has none: growth is not taxed and qualified withdrawals are tax-free. This makes a Roth the account where a premium tier priced around tax features is worth the least of anywhere, so compare on the base tier.
What should I actually compare when choosing for a Roth?
Four things: total cost including fund expense ratios, since it is one of the few variables still compounding; whether the allocation de-risks toward a retirement date; whether the platform also offers a traditional IRA at the same custodian, which matters if you ever need a backdoor contribution; and the minimum to open.
Can a robo-advisor do a backdoor Roth contribution?
Platforms that offer both traditional and Roth IRAs can hold both sides of it, but the contribution and the conversion are steps you initiate rather than something automated for you. If your income means a direct Roth contribution may be limited, choosing a platform that offers both account types keeps the option open.
How much can I contribute to a Roth IRA?
There is an annual contribution limit that changes periodically, and eligibility to contribute directly phases out above certain income levels. Because both figures are adjusted over time, check the current year's numbers rather than relying on any page's stated amount, including this one.
Is a Roth IRA better than a traditional IRA at a robo-advisor?
The platform choice does not change the answer, because it is a tax question rather than a product one: a Roth is funded with money already taxed and grows tax-free, while a traditional IRA gives a deduction now and is taxed on withdrawal. Which suits you depends on your tax rate now against your expected rate later.
Should I use a robo-advisor or just buy one fund in my Roth?
A single broad index fund or a target-date fund gets you diversified in one purchase for the fund's expense ratio, with no advisory fee. A robo-advisor adds a chosen allocation and automatic rebalancing for around 0.25%. In a Roth, where the tax features do nothing, the gap between the two is narrower than in a taxable account.
Can I move my Roth IRA to a different robo-advisor later?
Yes, and without tax consequences. Moving a Roth to another Roth is not a taxable event whether the positions transfer in kind or are sold and the cash moved. That makes the choice much lower-stakes than the equivalent decision in a taxable account.
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Walnut is informational and is not an investment adviser or a tax adviser, and nothing here is investment or tax advice. Contribution limits, income phase-outs, fees, minimums and account-type coverage change; verify current figures with the IRS and current terms on the provider's own site.