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A Roth IRA changes the math behind almost every robo-advisor comparison, because one of the most commonly marketed features — tax-loss harvesting — is completely irrelevant inside one. Roth contributions grow tax-free and qualified withdrawals aren’t taxed at all, so there are no annual capital gains to offset in the first place. That means the “best” robo-advisor for a Roth IRA isn’t necessarily the same platform that wins a taxable-account comparison. Here’s how the decision actually changes once tax-advantaged status is in play.
Quick Verdict
- Best overall for a Roth IRA: Fidelity Go. Since tax-loss harvesting doesn’t matter in a Roth, its $0 fee under $25,000 is close to unbeatable — you keep the feature that’s irrelevant here off the table entirely and pay nothing for management.
- Best if you want the lowest fee above $25,000: Vanguard Digital Advisor. At ~0.15%, it stays inexpensive well past the point where Fidelity Go’s fee kicks in.
- Best if you want broader diversification and don’t mind a $5,000 minimum: Schwab Intelligent Portfolios. $0 advisory fee, though the mandatory cash allocation still applies inside a Roth just as it does in a taxable account.
2026 Roth IRA Basics You Need Before Choosing a Platform
For 2026, the Roth IRA contribution limit is $7,500 for those under 50, and $8,600 for those 50 and older (a $1,100 catch-up contribution). Eligibility to contribute directly phases out based on modified adjusted gross income (MAGI): single filers phase out between $153,000 and $168,000, and joint filers between $242,000 and $252,000. Above those thresholds, direct contributions aren’t allowed, though a backdoor Roth conversion may be an option — that’s a strategy worth discussing with a tax professional rather than executing based on a blog post, since the mechanics and tax implications can get complicated depending on your other IRA balances.
The contribution deadline for a given tax year runs until the following April 15 — so 2026 contributions can technically be made as late as April 15, 2027.
Why Tax-Loss Harvesting Doesn’t Matter Here
Tax-loss harvesting — the headline feature at Betterment, Wealthfront, and (above $50,000) Schwab — works by selling losing positions to offset taxable capital gains. Inside a Roth IRA, there are no annual capital gains to offset in the first place, since the account isn’t taxed year to year. That means paying an extra 0.25% specifically for a tax-loss harvesting feature, as you would at Betterment or Wealthfront, buys you nothing extra inside a Roth compared to a $0-fee or lower-fee alternative that doesn’t offer it.
This is the single biggest way a Roth IRA comparison differs from the general “best robo-advisor” question — and it’s the reason Fidelity Go and Vanguard Digital Advisor punch above their weight here despite lacking TLH.
Side-by-Side: Best Options for a Roth IRA
| Platform | Fee | Minimum | TLH relevant here? | Note for Roth investors |
|---|---|---|---|---|
| Fidelity Go | $0 under $25,000 | $10 | No — irrelevant benefit either way | Best pure-cost option below $25,000 |
| Vanguard Digital Advisor | ~0.15% | $100 | No — irrelevant benefit either way | Simple 4-fund portfolio, low cost past $25K |
| Schwab Intelligent Portfolios | $0 advisory fee | $5,000 | No — irrelevant benefit either way | Cash allocation still applies inside a Roth |
| Betterment | 0.25% | $0 | No benefit inside a Roth | Paying for a feature (TLH) you can’t use here |
| Wealthfront | 0.25% | $500 | No benefit inside a Roth | Same tradeoff as Betterment |
| Acorns Later (IRA) | $3–$12/month flat | $5 | No — irrelevant benefit either way | Flat fee can be costly on a small Roth balance |
Why Fidelity Go Is Hard to Beat Below $25,000
Since a Roth IRA is capped at $7,500 (or $8,600) in new contributions per year, it can take years for many investors to build a Roth balance above $25,000 through contributions alone. For that entire stretch, Fidelity Go charges nothing, uses its own no-expense-ratio funds, and doesn’t ask you to give up any feature that would have mattered anyway. It’s rare that a “free” option is genuinely the best one on every dimension that matters for a specific account type — but for a Roth IRA under $25,000, that’s close to the case.
When Schwab or Vanguard Makes More Sense
Once your Roth balance is large enough to matter — whether through years of contributions, rollovers from a previous employer’s plan, or a Roth conversion — Fidelity Go’s fee-free advantage disappears at $25,000. At that point, Vanguard Digital Advisor’s ~0.15% fee remains one of the lowest available, or Schwab Intelligent Portfolios’ genuine $0 advisory fee becomes attractive if you’re comfortable with its mandatory cash allocation (see our [Schwab vs. Vanguard comparison] for a full breakdown of that tradeoff, which applies the same way inside a Roth as in a taxable account).
Don’t Pay for Tax-Loss Harvesting You Can’t Use
If you’re deciding between Betterment or Wealthfront and a lower-cost alternative specifically for a Roth IRA, it’s worth being honest about what you’re paying for. Both platforms’ 0.25% fee is partly justified, in a taxable account, by the tax-loss harvesting feature. Inside a Roth, that justification disappears — you’d be paying the same fee for a benefit that provides zero value in this account type. That doesn’t make Betterment or Wealthfront bad platforms; it just means their strongest selling point isn’t relevant here, and a Roth-specific comparison should weight fee and portfolio construction more heavily than tax tools.
A Practical Note on Rollovers and Multiple Accounts
Many investors end up with a Roth IRA at one provider and a taxable account or old 401(k) elsewhere. If tax-loss harvesting matters to you in a taxable account, there’s no requirement to use the same platform for both — you could reasonably hold a Roth IRA at Fidelity Go for the $0 fee, while using Betterment or Wealthfront for a separate taxable account where TLH actually applies.
Splitting platforms by account type, rather than defaulting to one provider for everything, can genuinely optimize cost without sacrificing any feature you’d actually use.
Our Methodology
This comparison is based on publicly available fee schedules, account minimums, and feature disclosures published by each provider as of 2026, along with 2026 IRS contribution and income limits published by the IRS and confirmed across provider sources. Contribution limits and income phase-out ranges adjust annually for inflation — always confirm current-year figures directly with the IRS or a tax professional before contributing. We do not maintain active accounts with every platform for this specific comparison; treat this article as a starting point for your own research.
Frequently Asked Questions
What’s the Roth IRA contribution limit for 2026? $7,500 for those under 50, and $8,600 for those 50 and older (a $1,100 catch-up contribution).
Does tax-loss harvesting matter for a Roth IRA? No. Roth IRA growth isn’t taxed annually, so there’s nothing for tax-loss harvesting to offset — the feature provides no benefit inside this account type.
What income disqualifies me from contributing to a Roth IRA in 2026? Single filers phase out between $153,000 and $168,000 MAGI; joint filers phase out between $242,000 and $252,000. Above those ranges, direct contributions aren’t allowed, though a backdoor Roth strategy may be an option worth discussing with a tax professional.
Can I use different robo-advisors for my Roth IRA and my taxable account? Yes. There’s no requirement to consolidate everything with one provider — some investors deliberately split accounts to match each platform’s strengths to the account type where they actually matter.