This is not investment advice. The information provided is for educational and informational purposes only and does not constitute a recommendation to buy or sell any financial product.
A robo-advisor is an online service that builds and manages a portfolio using an algorithm, with limited or no human adviser involvement. The category includes pure robo-advisors that are stand-alone products, brokerages that offer a robo-advisor tier alongside a self-directed account, and full-service brokers that use automation for part of the portfolio construction. The common thread is automation of the work that an adviser would otherwise do by hand.
What a robo-advisor actually does
The core service is risk profiling, portfolio construction, rebalancing, and tax-loss harvesting. The trader fills in a questionnaire about their goals, time horizon, and risk tolerance, and the algorithm allocates to a mix of low-cost ETFs. The portfolio is rebalanced periodically to maintain the target allocation, and the algorithm harvests tax losses where the structure allows. Some robo-advisors also offer direct indexing, where the algorithm holds individual stocks to replicate an index, which allows more granular tax-loss harvesting.
The fee for the service is usually 0.20% to 0.50% of assets per year, on top of the underlying ETF expense ratios. The total all-in cost is often below 0.50% per year, which is a fraction of a typical full-service broker's fee.
The case for a robo-advisor
The strongest case is for traders who want a hands-off, low-cost, broadly diversified portfolio and who do not have the time, the interest, or the expertise to manage it themselves. The algorithm does the work, the cost is low, and the discipline of rebalancing is enforced. For an investor in the accumulation phase, with a 20-year horizon and a standard target-date glide path, a robo-advisor is hard to beat on cost per basis point of value added.
A second case is for traders who want exposure to a broader strategy than a single broker can offer. Some robo-advisors are broker-agnostic and route trades across multiple custodians to get the best execution, the lowest expense ratio, or the most tax-efficient placement of the assets.
A third case is for traders who are early in their career and want a default behaviour. A robo-advisor removes the need to make allocation decisions, which is helpful for a trader who has not yet built a strong view on asset allocation. The cost of being wrong is small, and the cost of being right is the same as a self-directed portfolio.
The case against a robo-advisor
The main case against is the lack of personal contact. A robo-advisor does not call the trader when the market is falling, does not adjust the strategy for a major life event, and does not have a view on the trader's full financial picture. For a trader with a simple situation, that is fine. For a trader with a complex situation, the automation is a limitation.
A second case against is the limited customisation. Most robo-advisors offer a fixed set of portfolios based on risk profile. The trader cannot, for example, exclude a sector, overweight a thematic ETF, or tilt the portfolio toward a specific factor model. The algorithm's choices are the trader's choices.
A third case against is the dependency on the underlying ETFs. The robo-advisor's performance is the performance of the ETFs it holds, less the fee. The trader is taking on the same market risk as a passive investor, with the addition of a small fee. For a trader who could buy the same ETFs directly through a discount broker and rebalance manually, the robo-advisor fee is a real drag.
A fourth case against is the algorithm's blind spots. The risk profiling questionnaire is a simplification. The portfolio is built on the answers, and the answers do not always reflect the trader's true risk tolerance. A trader who is overconfident in the questionnaire and undersized in cash may experience a drawdown that is psychologically harder to hold than the algorithm expected.
How to evaluate a robo-advisor
The honest evaluation is to compare three numbers. The all-in fee, including the platform fee and the underlying ETF expense ratios. The portfolio construction, including the asset classes, the geographic mix, the factor exposures, and the rebalancing frequency. The tax treatment, including the harvesting policy, the placement of tax-efficient assets, and the structure of the account.
A practical test is to compare the robo-advisor's projected 10-year return to a do-it-yourself portfolio of similar ETFs at a discount broker, with manual rebalancing. The do-it-yourself portfolio has no platform fee, the same underlying ETFs, and a similar rebalancing discipline. The difference is the robo-advisor's fee, which compounds over time. If the fee is small relative to the value of automation, the robo-advisor is a fair deal. If the fee is high and the trader is willing to do the work, the do-it-yourself portfolio is the better deal.
Related resources
Where to start
If you are deciding between a robo-advisor, a full-service broker, and a discount broker, our broker comparison lists the account types and fee schedules at each broker. Sort by account type to see which brokers offer a robo-advisor tier, and use the fee schedule to compare the all-in cost against the underlying ETF expense ratios.