What Is a Robo-Advisor and How Does It Work?

Purple Flower

A robo-advisor automates investing for you - answering a simple questionnaire, building a portfolio matched to your risk tolerance, and rebalancing automatically. It’s not magic, but it is simple. Here’s how it works and whether it suits you.

What exactly is a robo-advisor?

A robo-advisor is a digital investment platform that manages your money with minimal human involvement. You don’t meet an adviser, you don’t call a bank, you don’t do anything except log into an app and answer a questionnaire about your finances and goals.

The platform uses that information to build a portfolio of index funds matched to your situation, automatically invests your money, and then quietly rebalances it over time. Most robo-advisors charge a simple annual fee - usually 0.5 per cent - and that’s it. No surprise costs, no hidden charges, no fund managers trying to outperform the market.

How does the setup process actually work?

It’s designed to be fast and frictionless. You create an account, verify your identity (usually through a video call or document check), and then answer a questionnaire. The questions are about your age, your income, your existing savings, how long until you need the money, and how uncomfortable you’d feel watching your portfolio fall 20 per cent in a downturn.

Based on your answers, the platform generates a recommended asset allocation. Typically this is a mix of equity index funds and bond index funds, weighted differently depending on your risk tolerance. Someone aged 65 might get a portfolio that’s 50 per cent stocks and 50 per cent bonds. Someone aged 30 might get 90 per cent stocks and 10 per cent bonds.

You review the recommendation, deposit money (a lump sum or set up regular transfers), and the platform buys your portfolio automatically. The whole process takes less than an hour.

What do robo-advisors actually invest in?

Low-cost index funds and exchange-traded funds (ETFs). Mostly global equity trackers, UK equity trackers, bond funds, and sometimes alternatives like property or commodities. The specific mix depends on which platform you use and your own risk profile.

They don’t pick individual stocks. They don’t try to time the market. They just build a sensible, diversified portfolio that matches your risk tolerance and then stick to it.

How does rebalancing work and why does it matter?

Over time, if your equity allocation grows faster than your bond allocation, your portfolio drifts away from your target. You end up with more risk than you intended. Rebalancing means selling some of the winners and buying more of the laggards to get back to your target allocation.

Most robo-advisors rebalance automatically - usually once a quarter or once a year. Some do it when your portfolio drifts more than a certain amount. This keeps your risk profile consistent and forces you to buy low and sell high, which is the opposite of what most people instinctively do during market swings.

UK robo-advisor options - what’s available?

Nutmeg is one of the oldest and most established. It charges 0.35 to 0.75 per cent depending on your portfolio size, starts with as little as £1, and uses a mix of vanguard and iShares funds. The questionnaire is thorough and the platform is straightforward.

Wealthify is slightly different - it packages portfolios into themed "pots" like "Steady Growth" or "Adventurous Growth" rather than showing you a percentage split. The interface is very simple, costs are 0.5 to 0.6 per cent per year, and minimum investment is £1.

Moneyfarm offers a hybrid model - mostly algorithmic but with access to human advisers if you want it. Fees are 0.6 per cent, minimum investment is £500, and it’s particularly good if you think you might want occasional professional input.

InvestEngine is a newer entrant focused on younger investors. Charges just 0.25 per cent, has no account fees, and the minimum is £100. Its portfolios are constructed from iShares ETFs.

How much does a robo-advisor cost versus traditional advice?

A traditional financial adviser might charge 1 to 1.5 per cent annually, or a fixed fee like £2,000 per year. Some charge a percentage of the first contribution ("initial charge") on top.

A robo-advisor charges 0.25 to 0.75 per cent. That’s not just cheaper - over 20 years on a £50,000 investment growing at 7 per cent annually, the difference between 0.3 per cent and 1 per cent is about £35,000. That’s real money.

You’re also paying for index funds inside the robo-adviser, which charge their own small ongoing charges (usually 0.1 to 0.25 per cent). So total cost is typically 0.4 to 1 per cent annually, which is still much cheaper than traditional financial advice.

Who does a robo-advisor work well for?

Robo-advisors suit someone who has moderate wealth to invest (from £1 upwards, though it’s most useful if you have a few thousand), wants to be hands-off, and doesn’t need personalised advice on complex matters like inheritance tax or business property. They’re great if you find the idea of picking funds intimidating. They’re perfect if you’re disciplined and want to invest regularly and forget about it.

They work less well if your situation is complex - multiple properties, a business, significant existing investments, or unusual tax circumstances. In those cases, a human adviser’s guidance on the big picture often justifies the higher cost.

Can you withdraw money whenever you want?

Yes. Your money is yours. You can withdraw it anytime. When you do, your robo-adviser sells enough of your portfolio to cover the withdrawal and moves the money to your bank account. This usually takes a few business days to settle.

Be aware of capital gains tax. If you’ve made gains, selling and withdrawing triggers a tax bill. You get an allowance (£3,000 in the 2024-25 tax year), but gains above that are taxable at 10 or 20 per cent depending on your income tax band.

What are the limitations of robo-advice?

The biggest is that a robo-adviser answers a questionnaire once and then assumes your circumstances stay the same. If you get a promotion, have a child, or change your timeline, you need to update the questionnaire yourself. A human adviser would notice and proactively adjust.

Robo-advisers also don’t help with the psychology of investing. When markets crash, you won’t get a reassuring call explaining why you should stay invested. You have to do that yourself (or read an article like this one).

And they can’t advise you on tax efficiency beyond the basics of suggesting an ISA wrapper, or on the interactions between your investments, your pension, your mortgage, and your overall financial strategy.

Where Mona Fits

A robo-adviser is a great choice if you want automation and low costs. Mona complements this by helping you understand the bigger picture - your budget, your savings goals, your emergency fund, your debt. Together, they give you a complete financial picture: the disciplined, low-cost investment approach through a robo-adviser, and the day-to-day financial clarity through Mona.

The Bottom Line

Robo-advisors take the complexity out of investing by asking you a few questions, building a diversified portfolio matched to your risk tolerance, and rebalancing automatically. Costs are low - typically 0.4 to 0.75 per cent annually - and there’s no pretence that the platform will beat the market. What you see is what you get: simple, passive, hands-off investing.

If you want to invest but don’t want to research funds or meet with an adviser, try Nutmeg or Wealthify. Set up regular monthly contributions, answer the questionnaire honestly, and then let it run.

For more information on robo-advisers and automated investing, visit MoneyHelper.org.uk

Join Mona’s early access waitlist

Join the waitlist

All articles

What Is a Robo-Advisor and How Does It Work?

Purple Flower

A robo-advisor automates investing for you - answering a simple questionnaire, building a portfolio matched to your risk tolerance, and rebalancing automatically. It’s not magic, but it is simple. Here’s how it works and whether it suits you.

What exactly is a robo-advisor?

A robo-advisor is a digital investment platform that manages your money with minimal human involvement. You don’t meet an adviser, you don’t call a bank, you don’t do anything except log into an app and answer a questionnaire about your finances and goals.

The platform uses that information to build a portfolio of index funds matched to your situation, automatically invests your money, and then quietly rebalances it over time. Most robo-advisors charge a simple annual fee - usually 0.5 per cent - and that’s it. No surprise costs, no hidden charges, no fund managers trying to outperform the market.

How does the setup process actually work?

It’s designed to be fast and frictionless. You create an account, verify your identity (usually through a video call or document check), and then answer a questionnaire. The questions are about your age, your income, your existing savings, how long until you need the money, and how uncomfortable you’d feel watching your portfolio fall 20 per cent in a downturn.

Based on your answers, the platform generates a recommended asset allocation. Typically this is a mix of equity index funds and bond index funds, weighted differently depending on your risk tolerance. Someone aged 65 might get a portfolio that’s 50 per cent stocks and 50 per cent bonds. Someone aged 30 might get 90 per cent stocks and 10 per cent bonds.

You review the recommendation, deposit money (a lump sum or set up regular transfers), and the platform buys your portfolio automatically. The whole process takes less than an hour.

What do robo-advisors actually invest in?

Low-cost index funds and exchange-traded funds (ETFs). Mostly global equity trackers, UK equity trackers, bond funds, and sometimes alternatives like property or commodities. The specific mix depends on which platform you use and your own risk profile.

They don’t pick individual stocks. They don’t try to time the market. They just build a sensible, diversified portfolio that matches your risk tolerance and then stick to it.

How does rebalancing work and why does it matter?

Over time, if your equity allocation grows faster than your bond allocation, your portfolio drifts away from your target. You end up with more risk than you intended. Rebalancing means selling some of the winners and buying more of the laggards to get back to your target allocation.

Most robo-advisors rebalance automatically - usually once a quarter or once a year. Some do it when your portfolio drifts more than a certain amount. This keeps your risk profile consistent and forces you to buy low and sell high, which is the opposite of what most people instinctively do during market swings.

UK robo-advisor options - what’s available?

Nutmeg is one of the oldest and most established. It charges 0.35 to 0.75 per cent depending on your portfolio size, starts with as little as £1, and uses a mix of vanguard and iShares funds. The questionnaire is thorough and the platform is straightforward.

Wealthify is slightly different - it packages portfolios into themed "pots" like "Steady Growth" or "Adventurous Growth" rather than showing you a percentage split. The interface is very simple, costs are 0.5 to 0.6 per cent per year, and minimum investment is £1.

Moneyfarm offers a hybrid model - mostly algorithmic but with access to human advisers if you want it. Fees are 0.6 per cent, minimum investment is £500, and it’s particularly good if you think you might want occasional professional input.

InvestEngine is a newer entrant focused on younger investors. Charges just 0.25 per cent, has no account fees, and the minimum is £100. Its portfolios are constructed from iShares ETFs.

How much does a robo-advisor cost versus traditional advice?

A traditional financial adviser might charge 1 to 1.5 per cent annually, or a fixed fee like £2,000 per year. Some charge a percentage of the first contribution ("initial charge") on top.

A robo-advisor charges 0.25 to 0.75 per cent. That’s not just cheaper - over 20 years on a £50,000 investment growing at 7 per cent annually, the difference between 0.3 per cent and 1 per cent is about £35,000. That’s real money.

You’re also paying for index funds inside the robo-adviser, which charge their own small ongoing charges (usually 0.1 to 0.25 per cent). So total cost is typically 0.4 to 1 per cent annually, which is still much cheaper than traditional financial advice.

Who does a robo-advisor work well for?

Robo-advisors suit someone who has moderate wealth to invest (from £1 upwards, though it’s most useful if you have a few thousand), wants to be hands-off, and doesn’t need personalised advice on complex matters like inheritance tax or business property. They’re great if you find the idea of picking funds intimidating. They’re perfect if you’re disciplined and want to invest regularly and forget about it.

They work less well if your situation is complex - multiple properties, a business, significant existing investments, or unusual tax circumstances. In those cases, a human adviser’s guidance on the big picture often justifies the higher cost.

Can you withdraw money whenever you want?

Yes. Your money is yours. You can withdraw it anytime. When you do, your robo-adviser sells enough of your portfolio to cover the withdrawal and moves the money to your bank account. This usually takes a few business days to settle.

Be aware of capital gains tax. If you’ve made gains, selling and withdrawing triggers a tax bill. You get an allowance (£3,000 in the 2024-25 tax year), but gains above that are taxable at 10 or 20 per cent depending on your income tax band.

What are the limitations of robo-advice?

The biggest is that a robo-adviser answers a questionnaire once and then assumes your circumstances stay the same. If you get a promotion, have a child, or change your timeline, you need to update the questionnaire yourself. A human adviser would notice and proactively adjust.

Robo-advisers also don’t help with the psychology of investing. When markets crash, you won’t get a reassuring call explaining why you should stay invested. You have to do that yourself (or read an article like this one).

And they can’t advise you on tax efficiency beyond the basics of suggesting an ISA wrapper, or on the interactions between your investments, your pension, your mortgage, and your overall financial strategy.

Where Mona Fits

A robo-adviser is a great choice if you want automation and low costs. Mona complements this by helping you understand the bigger picture - your budget, your savings goals, your emergency fund, your debt. Together, they give you a complete financial picture: the disciplined, low-cost investment approach through a robo-adviser, and the day-to-day financial clarity through Mona.

The Bottom Line

Robo-advisors take the complexity out of investing by asking you a few questions, building a diversified portfolio matched to your risk tolerance, and rebalancing automatically. Costs are low - typically 0.4 to 0.75 per cent annually - and there’s no pretence that the platform will beat the market. What you see is what you get: simple, passive, hands-off investing.

If you want to invest but don’t want to research funds or meet with an adviser, try Nutmeg or Wealthify. Set up regular monthly contributions, answer the questionnaire honestly, and then let it run.

For more information on robo-advisers and automated investing, visit MoneyHelper.org.uk

Join Mona’s early access waitlist

Join the waitlist

All articles