How a robo-advisor works
SEC staff describe robo-advisers as firms, typically registered investment advisers, that use online algorithm-based programs to manage clients’ money with discretion. You answer a questionnaire about your goal, timeline, income, other assets and risk tolerance. The service matches your answers to one of its model portfolios, often a mix of broad ETFs across US stocks, international stocks and bonds, and invests your money in an account held at a brokerage.
After that, the software runs the account. It invests new deposits, reinvests dividends and rebalances when the mix drifts from its target. Some services add tax-loss harvesting in taxable accounts, goal tracking and automatic deposits.
The amount of human help varies widely. Some services offer only technical support, while hybrid services, which the SEC’s investor education staff has called “bionic” advice, let you contact an investment professional, sometimes only above a minimum account size. The SEC also warns that a robo-adviser’s recommendation is limited by the information it asks for, and some never ask about your debts, home or other accounts.
What a robo-advisor really costs
A robo-advisor’s price has two layers. The first is the advisory fee, often a percentage of the assets it manages, deducted from the account; see AUM fee. The second is the expense ratio of each fund in your portfolio, which you pay inside the funds and never see on a bill. The SEC points out that low-cost advice paired with high-cost funds can still add up to a high total, so add both layers, as in the formula below.
Ask how else the firm is paid. The SEC suggests checking whether a robo-adviser offers only products from affiliated fund companies, is paid to recommend particular products, charges to withdraw, transfer or close an account, or pays others for client referrals.
Then compare the total with simpler alternatives. The SEC’s bulletin notes that a robo service may not differ much from what you could get from a traditional advisory program or a single target-date fund, which charges fund expenses but no separate advisory fee.
Automated tax-loss harvesting and its blind spots
Many robo-advisors offer automated tax-loss harvesting in taxable accounts. When a fund falls below what you paid, the software sells it and buys a similar, but not substantially identical, fund, so you stay invested while realizing a capital loss that can offset gains and up to $3,000 a year of other income ($1,500 if married filing separately).
The trouble is what the software cannot see. Under the wash-sale rule, a loss is disallowed if substantially identical securities are bought within 30 days before or after the sale, and IRS Publication 550 says that includes purchases for your own IRA or Roth IRA and purchases by your spouse. A robo-advisor that never asks about those accounts will not notice a dividend reinvested in your IRA elsewhere, or a spouse’s automatic purchase. If the repurchase happens inside an IRA, Revenue Ruling 2008-5 says the disallowed loss does not increase your basis in the IRA, so the loss is lost rather than postponed.
Even a clean harvest mostly defers tax. Each loss lowers your cost basis and enlarges a later gain, unless you hold the shares until death and your heirs receive a stepped-up basis.
Robo-advisor vs. a human financial advisor
The two differ mainly in scope. A robo-advisor manages an investment portfolio. A human financial advisor can also coordinate the decisions around it: when to claim Social Security, which accounts to draw first in retirement, whether to convert to a Roth, how much insurance to carry and how to leave money to heirs. Those choices can matter more than a few tenths of a percent in fees.
Both can be held to a high standard. SEC staff guidance says robo-advisers, like all registered investment advisers, are subject to the substantive and Fiduciary obligations of the Investment Advisers Act of 1940. The same guidance warns robo-advisers not to imply that they provide a comprehensive financial plan when they do not consider a client’s taxes or debts, or that a tax-loss harvesting service amounts to comprehensive tax advice.
Someone early in a career with a simple situation may need little beyond automated investing. Someone near retirement with several account types, a pension or stock compensation may get more from planning advice, from a person or a hybrid service.
How to check a robo-advisor before you sign up
Because there may be no conversation with a person before you invest, the firm’s documents do the explaining. Every registered investment adviser files Form ADV, and its Part 2 brochure describes services, fees and conflicts of interest. SEC-registered advisers and brokers must also give retail investors a short relationship summary called Form CRS. You can find both, along with the firm’s registration and any disciplinary history, through the investment professional search on Investor.gov. Then work through these questions.
- What does the questionnaire ask, and does it consider your debts, home, workplace plan and other accounts?
- Which account types can it manage: taxable accounts, traditional and Roth IRAs, 529 plans or a 401(k)?
- How often does it rebalance, and what triggers a change in your portfolio?
- Can it freeze sales or delay withdrawals during extreme market volatility?
- What is the all-in cost, including fund expenses, and what does it charge to transfer or close the account?
- Does it favor its own affiliated funds, or pay others to refer clients?
Illustrative numbers
One year’s cost on $80,000 under three hypothetical setups
- Advisory fee %
- The robo-advisor’s annual fee as a share of the assets it manages
- Fund weight
- Each fund’s share of your portfolio
- Fund expense ratio
- Each fund’s annual expense ratio, from its prospectus
Multiply the all-in percentage by your balance for the yearly dollar cost; the fund layer never shows up as a separate charge.
Advisory fee at 0.25%$200
ETF expense ratios, weighted average 0.07%$56
All-in robo-advisor cost, 0.32%$256 a year
Same funds with a 1.00% human adviser fee1.07% = $856 a year
One index target-date fund at 0.12%, no adviser$96 a year
In this illustration the robo-advisor costs $160 a year more than holding one fund yourself and $600 less than the 1% adviser. Whether a layer is worth paying for depends on what you use: automatic rebalancing and harvesting, or the planning help a person gives. Every percentage here is hypothetical, so check each firm’s brochure and each fund’s prospectus.
At a glance
Robo-advisors compared with other ways to invest
| Option | Who sets and maintains the mix | How you pay | Help beyond investing |
|---|---|---|---|
| Robo-advisor | Software, from your questionnaire | Advisory fee, often a share of assets, plus fund expenses | Limited; tools vary by service |
| Hybrid robo-advisor | Software, with human professionals available | Advisory fee plus fund expenses; human access may need a minimum balance | Some conversations with a person |
| Human financial advisor | An adviser who knows your situation | Asset-based, flat or hourly fees, plus fund expenses | Can cover taxes, withdrawals, insurance and estate |
| Target-date fund | Fund managers, on a set glide path | Fund expenses only, no advisory fee | None |
| Do-it-yourself index funds | You | Fund expense ratios only | Whatever you do yourself |
Put it in your plan
Robo-Advisor in MoneyWhatIf
MoneyWhatIf projects plans; it does not execute trades in an investment account. To model a robo account, enter it as an investment account with its bond share and a yearly fee equal to the advisory fee plus the funds’ expense ratios; the projection deducts that fee every year, and Strategy Lab can include investment fees among the changes it tests. Losses already harvested go under Capital losses in Default settings as an opening pool that new plans inherit. For a second opinion, share one plan view-only with an adviser’s email address.
Common questions
Robo-Advisor FAQs
Are robo-advisors safe?
The firms are regulated, but your investments can still lose value. Robo-advisors are typically registered with the SEC or state securities regulators, and your money sits in a brokerage account. If that brokerage is a SIPC member, SIPC protects up to $500,000 per customer, including a $250,000 limit for cash, when the firm fails and assets are missing. It does not cover market losses. Check a firm’s registration and history on Investor.gov before opening an account.
Is a robo-advisor a fiduciary?
Typically, yes. SEC staff have said that robo-advisers, like all registered investment advisers, are subject to the fiduciary obligations of the Investment Advisers Act of 1940, including a duty to make full and fair disclosure of all material facts. The duty attaches to the advice the service actually gives, which is often limited to investing the money in its accounts based on your questionnaire answers.
How much money do you need to start with a robo-advisor?
Minimums vary by service, and the SEC notes that robo-advisers sometimes require lower account minimums than traditional investment advisers. Access to a human professional may require a larger balance. More important than the minimum is how the fee scales: an asset-based fee grows in dollars as your Investment Portfolio grows, so a fee that is trivial on $5,000 can become significant on $500,000.
Can a robo-advisor build a 60/40 portfolio?
Often. Robo-advisors typically match each client to one of a set of model portfolios, and a moderate one may look much like a 60/40 portfolio. Labels differ between firms, so look at the actual stock and bond percentages rather than the name. The robo sets the mix only for the accounts it manages; if you hold other investments, your combined mix may be quite different.
Is a robo-advisor worth it?
It depends on which parts of the service you would use. The advisory fee pays for automatic investing, rebalancing and, in taxable accounts, loss harvesting. If most of your money sits in a 401(k) and IRAs, where harvesting does nothing, a single low-cost target-date fund may do a similar job for less. If you need help with taxes, withdrawals or Social Security timing, a robo-advisor’s scope may be too narrow. Compare the all-in cost in dollars with the features you would actually use.