Best Low-Cost Robo-Advisors: Ranked by Total Cost, Not Headline Rate
Last updated August 2026
Short answer
Ranked on total cost rather than headline rate, because the two rarely agree. Paying no percentage of assets at all, by keeping your own broker, is arithmetically the cheapest and costs you the automation instead. Among actual robo-advisors, Fidelity Go is free below a balance threshold and Schwab Intelligent Portfolios charges no advisory fee but requires a cash allocation it earns interest on. Vanguard Digital Advisor is the lowest fee that is actually charged rather than waived. Betterment and Wealthfront sit at the standard 0.25% and are priced for their features. Walnut is not a robo-advisor and is not an investment adviser.
Every list of cheap robo-advisors ranks the advisory fee, which is the one number platforms control and advertise. It is also the number least likely to describe what you pay. A zero advisory fee funded by a required cash allocation can cost more over a decade than a transparent quarter of a percent, and a platform using its own zero-expense-ratio funds can genuinely be free. This page ranks on the total.
Ranked by what you actually pay
| Option | Advisory fee | What else you pay | Where it falls short |
|---|---|---|---|
| Keep your own broker (not a robo-advisor) | None. Nothing is under management, so there is no percentage of assets | Fund expense ratios only, and you choose which funds, so this can be the lowest total on the page | Nothing rebalances and nothing harvests losses. You are buying the cost saving with your own time and discipline, which is a real price even though it is not billed. |
| Fidelity Go | No advisory fee below a stated balance threshold, then a percentage of assets above it | Uses the firm's own Flex funds, several of which carry no expense ratio | The fee appears precisely when the balance becomes significant, so the free tier is the opposite of a long-term saving. |
| Schwab Intelligent Portfolios | No advisory fee on the base tier | Requires a cash allocation the firm earns interest on, which is the real price of the zero fee | A required cash position in a long-horizon portfolio is money not invested. Over a decade it can cost more than a transparent 0.25% would have. |
| Vanguard Digital Advisor | A very low all-in advisory fee, among the lowest that is actually charged rather than waived | Built on the firm's own broad index funds, which are cheap | Fewer planning and tax features than the platforms charging more, and a meaningful account minimum. |
| SoFi Robo Investing | Historically no management fee on its automated investing product | Fund expense ratios; the wider business earns from banking and lending products | Thinner planning and tax tooling than the established robos, and the free tier's terms have changed before. |
| Betterment | Around 0.25% of assets a year on the core digital plan | Low-cost third-party ETFs | Not the cheapest on this page, and it does not claim to be. You are paying for the feature set. |
| Wealthfront | Around 0.25% of assets a year | Low-cost third-party ETFs; direct indexing on larger taxable balances | The features that justify the fee mostly unlock above balance thresholds, so smaller accounts pay for less. |
How this was ranked
On total annual cost to a long-horizon investor: the advisory fee, plus the weighted expense ratios of the funds the portfolio holds, plus the cost of any allocation the platform requires you to keep in cash. Feature depth is noted but does not move the ranking, because that is what the general roundup is for.
To be upfront, since this is our site: the first entry is Walnut's category and it is not a robo-advisor. It leads a cost ranking because zero advisory fee and no required cash is arithmetically first, and it is labelled so nobody mistakes it for a managed portfolio. On the general roundup, where the ranking is about robo-advisors doing what robo-advisors do, the same option sits third.
Four cost structures on $100,000
The same balance, four ways, to show why headline rate is the wrong comparison:
| Structure | All-in rate | Per year |
|---|---|---|
| 0.25% advisory + 0.08% funds | 0.33% | $330 |
| No advisory fee + 0.03% funds | 0.03% | $30 |
| No advisory fee + 0.05% funds + 8% held in cash | Not a fee, but the cash is uninvested | Depends on markets, and it is not zero |
| No advisory fee, your own broker, 0.05% funds | 0.05% | $50 |
The third row is the one to sit with. It has no fee at all and is not obviously the cheapest, because the cost is not a fee, it is opportunity. Full arithmetic in robo-advisor fees explained.
1. Keep your own broker (not a robo-advisor)
Advisory fee. None. Nothing is under management, so there is no percentage of assets
What else you pay. Fund expense ratios only, and you choose which funds, so this can be the lowest total on the page
Best for. Anyone whose objection to a robo-advisor is the ongoing fee, and who will do the maintenance
Where it falls short. Nothing rebalances and nothing harvests losses. You are buying the cost saving with your own time and discipline, which is a real price even though it is not billed.
2. Fidelity Go
Advisory fee. No advisory fee below a stated balance threshold, then a percentage of assets above it
What else you pay. Uses the firm's own Flex funds, several of which carry no expense ratio
Best for. Starting small at genuinely zero total cost, especially if you already bank at the same custodian
Where it falls short. The fee appears precisely when the balance becomes significant, so the free tier is the opposite of a long-term saving.
3. Schwab Intelligent Portfolios
Advisory fee. No advisory fee on the base tier
What else you pay. Requires a cash allocation the firm earns interest on, which is the real price of the zero fee
Best for. Investors who want zero advisory fee and are comfortable holding a slice in cash
Where it falls short. A required cash position in a long-horizon portfolio is money not invested. Over a decade it can cost more than a transparent 0.25% would have.
4. Vanguard Digital Advisor
Advisory fee. A very low all-in advisory fee, among the lowest that is actually charged rather than waived
What else you pay. Built on the firm's own broad index funds, which are cheap
Best for. Index-minded savers who want the lowest honest all-in number without a cash requirement
Where it falls short. Fewer planning and tax features than the platforms charging more, and a meaningful account minimum.
5. SoFi Robo Investing
Advisory fee. Historically no management fee on its automated investing product
What else you pay. Fund expense ratios; the wider business earns from banking and lending products
Best for. Beginners who want investing next to banking in one app at low cost
Where it falls short. Thinner planning and tax tooling than the established robos, and the free tier's terms have changed before.
6. Betterment
Advisory fee. Around 0.25% of assets a year on the core digital plan
What else you pay. Low-cost third-party ETFs
Best for. People who want the tax and goal features and accept the standard rate for them
Where it falls short. Not the cheapest on this page, and it does not claim to be. You are paying for the feature set.
7. Wealthfront
Advisory fee. Around 0.25% of assets a year
What else you pay. Low-cost third-party ETFs; direct indexing on larger taxable balances
Best for. Larger taxable accounts where the tax features can plausibly outweigh the fee
Where it falls short. The features that justify the fee mostly unlock above balance thresholds, so smaller accounts pay for less.
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The three costs that never appear in a fee comparison
Cash drag. A required allocation held uninvested is not billed, so it is absent from every comparison table, and on a long-horizon portfolio it is frequently the largest cost on a no-fee platform.
The transfer-in tax event. If you move an appreciated taxable portfolio and the platform sells it to buy its model allocation, that is a one-off cost that can exceed several years of the fee you were comparing. It is invisible until it lands on a tax return.
Fund turnover. Two portfolios with identical expense ratios can generate very different taxable distributions depending on how often the underlying funds trade. Low-turnover index funds are quietly more tax-efficient, which is a real cost difference that no fee column captures.
Before you choose on price
Cost is the right primary filter only once you have decided you want a managed portfolio at all, and only after checking that the platform supports your account type. Both of those come earlier in the seven checks, and the honest version of whether the category suits you is in are robo-advisors worth it.
If the fee is your only objection and you would genuinely handle the maintenance, the first row is the cheapest answer on the page, and the trade is worked through in robo-advisor vs doing it yourself.
FAQ
Which costs are missing from a standard fee comparison?
Three. A required cash allocation, which is never billed and is often the largest cost on a no-fee platform. The one-off tax event if the platform sells an appreciated portfolio you transfer in. And fund turnover, since two portfolios with identical expense ratios can throw off very different taxable distributions.
Is the cheapest robo-advisor the best one for me?
Only once you have checked that it supports your account type and does what you want. Cost is the right tiebreaker between two suitable platforms and a poor first filter, because the cheapest option that does not offer the account you need is not an option at all.
What is the cheapest robo-advisor?
On headline rate, the platforms charging no advisory fee, of which Fidelity Go below its balance threshold and Schwab Intelligent Portfolios are the best known. On total cost the answer changes, because a zero advisory fee is usually funded another way: Schwab requires a cash allocation and earns interest on it, and Fidelity Go's fee begins once your balance passes the threshold.
Is a no-fee robo-advisor really free?
The advisory fee can genuinely be zero, and the platform still earns. The common routes are a required cash allocation the firm collects interest on, placing you in the firm's own funds so revenue moves into the expense ratio, or earning on order flow. None of it is hidden, but none appears as a line item, so compare total cost rather than headline rate.
How much should a robo-advisor cost?
Around 0.25% of assets a year is the category standard for a full-featured platform, plus fund expense ratios of roughly 0.03% to 0.20%, so about 0.30% all in. Anything meaningfully above that needs a reason, such as human advisor access. Anything at zero needs an explanation of how the platform earns instead.
What is cash drag and how much does it cost?
Cash drag is the cost of money held uninvested inside a portfolio meant to be invested. It is not billed, so it never appears in a fee comparison, and its cost depends on what markets did while the cash sat there. On a long-horizon portfolio a required allocation of several percent is a real cost and is the usual reason a no-advisory-fee platform can afford to charge nothing.
Do I pay fund fees on top of a low-cost robo-advisor?
Yes, always, on every platform including the free ones. Your money is held in ETFs or index funds that charge their own expense ratios inside the fund. A platform using its own zero-expense-ratio funds genuinely removes this layer; most do not.
Is a cheaper robo-advisor worse?
Not on the investing itself. The portfolios are built from the same universe of broad index funds, so a cheap platform and an expensive one often hold something very similar. What you give up further down the price ladder is planning tools, tax features, account-type coverage and human access, not investment quality.
What is the lowest-cost way to invest that is not a robo-advisor?
Buying broad index funds yourself in your own brokerage account. There is no advisory fee because nothing is under management, so you pay only the fund expense ratios, which can be a few hundredths of a percent. What it costs instead is the maintenance: nobody rebalances and nobody harvests losses.
Does a low fee matter more than the features?
It depends on the balance. On a starter account the difference between 0% and 0.25% is a few tens of dollars a year and the features are worth more. By the time the account is large, the same rate is a real annual number and the features have to justify themselves. Price the fee against the balance you expect in five years.
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Walnut is informational and is not an investment adviser, and nothing here is investment advice or a recommendation of any platform. Fees, minimums, cash allocations and fund line-ups change frequently; verify current terms on the provider's own site before opening an account.