UK Robo-Advisor vs DIY Index Investing (2026/27)
UK robo-advisor vs DIY index investing 2026/27: Nutmeg 0.75%, Moneyfarm 0.75%, Wealthify 0.6% vs Vanguard FTSE Global All Cap 0.22% OCF + Vanguard platform 0.15%, 25-year compound cost impact, when robo-advisor justifies the higher fee, target-date funds as a middle ground.
All-in costs comparison
| Provider | All-in annual cost | Features |
|---|---|---|
| Nutmeg (Managed Portfolio) | ~0.75-1.0% (platform 0.45-0.75% + fund 0.17-0.32%) | Fully managed, 5 risk levels, target dates, social impact options |
| Moneyfarm (Managed) | ~0.75-1.0% | Similar to Nutmeg, 7 portfolios, free advice |
| Wealthify (Managed) | ~0.6% | Aviva-owned, 5 risk levels, ethical option |
| InvestEngine (DIY) | 0.20-0.30% (free platform + ETF fees) | ETF-only, auto-investing, very low cost |
| Vanguard LifeStrategy | 0.37% (0.15% platform + 0.22% fund) | Pick risk level (20/40/60/80/100% equity), single fund, auto-rebalancing |
| Vanguard FTSE Global All Cap (DIY) | 0.37% (0.15% platform + 0.22% fund) | Single global equity index, 7,200 stocks, no bonds (DIY bond allocation if wanted) |
| Vanguard Target Retirement | 0.39% (0.15% + 0.24%) | Auto-glide path - equity allocation reduces as target retirement date approaches |
25-year compound cost impact
Starting balance £100,000, 7% annual gross return, 25-year horizon. After-fee final balance:
- Vanguard FTSE Global All Cap (0.37% all-in): ~£517,000
- InvestEngine DIY (0.25% all-in): ~£532,000
- Wealthify (0.6% all-in): ~£487,000
- Nutmeg / Moneyfarm (~0.9% all-in): ~£447,000
- Active fund (~1.5% all-in): ~£390,000
Difference between cheapest + most expensive: ~£140,000 over 25 years on the same £100k start. For larger pots + longer timelines, differences scale up dramatically. The compounding cost of fees is the single largest controllable factor in long-term investment returns.
Related guides
- UK S&S ISA Provider Comparison 2026/27 - platform-by-platform.
- UK SIPP vs Personal Pension 2026/27 - retirement wrapper.
- UK ISA Strategy Complete 2026/27 - holistic ISA plan.
- UK FIRE Movement 2026 - DIY index investing for FI.
Frequently asked questions
What's the cost difference over time?
Significant. Example: £100,000 invested for 25 years at 7% annual return. Nutmeg at 0.9%: ends at ~£447,000. Vanguard at 0.37%: ends at ~£517,000. Difference: ~£70,000 lost to fees. Over 35-year retirement timeline + larger pots: differences compound to £150,000-£300,000+. The 0.5-0.7% additional cost of robo-advisor over DIY adds up to material wealth difference. This is the central argument for DIY index investing.
When does a robo-advisor justify the higher fee?
(a) Complete beginners who would otherwise procrastinate or pick bad investments. A robo-advisor in your name + saving £200/mo beats not investing at all. (b) Fear of decision paralysis - if choosing Vanguard FTSE Global All Cap vs LifeStrategy 80% vs Target Retirement feels overwhelming + would prevent you investing. (c) Mid-life consolidation when you want hands-off management approaching retirement. (d) Inheriting or receiving a windfall + needing temporary management while learning. (e) Bull market + bear market discipline - robo-advisors enforce rebalancing + prevent emotional moves. For most investors above £20-£30k with willingness to manage 1 fund: DIY Vanguard wins on cost-adjusted returns.
What's the simplest DIY portfolio?
Single-fund portfolio. Most popular: Vanguard FTSE Global All Cap - 7,200 global stocks, 0.22% OCF. Covers developed + emerging markets. Reinvesting share class = automatic compounding. Or Vanguard LifeStrategy series (20/40/60/80/100% equity) - includes bonds for risk management. Pick one fund matching your risk tolerance + age (rule of thumb: equity % = 110 minus your age, so 30-year-old = 80% equity). Set up monthly direct debit. Don't check daily. Rebalance annually (or with target-date funds, never). Over 30+ years, this beats most professional fund managers + most robo-advisors after costs.
What about Target-Date Retirement funds?
Middle ground between robo-advisor + single-fund DIY. Vanguard Target Retirement series picks a target year (e.g. 2055, 2050, 2045). Automatically reduces equity allocation as the date approaches (glide path from 90% equity to 30-40% equity at retirement). All-in cost ~0.39%. Pros: hands-off, automatic risk reduction, single fund. Cons: glide path may not match your specific needs; less flexibility. Best for: hands-off investors who want automatic rebalancing + risk reduction without paying robo-advisor fees.
Which robo-advisor is best?
Personal preference + features. Nutmeg + Moneyfarm are the established UK leaders with similar fees. Wealthify is cheaper but less sophisticated. InvestEngine's managed service uniquely sits at 0.25% all-in - by far the cheapest robo if you must use one. For most people considering robo: try InvestEngine first (lowest cost) - if you need more features / advice / handholding, then Nutmeg or Moneyfarm. None compete on cost with DIY Vanguard for engaged investors.
Can I switch from robo-advisor to DIY?
Yes - via Individual Savings Account (ISA) transfer process. Cash-out + redeposit loses ISA wrapper; in-specie transfer where possible. Robo-advisors hold ETFs / funds; you may need to sell + transfer cash to new provider (the receiving DIY provider may not support the specific robo-portfolio funds). Plan transfer when markets are calm to minimise out-of-market periods. Most robos cover the transfer cost. Common path: start with robo to build habit + invest discipline, switch to DIY at £20k+ when cost saving becomes material.
What about active fund management?
Generally NOT worth the cost. UK active fund average OCF 0.8-1.5% vs index 0.07-0.22%. Over 25 years, this gap compounds. Research consistently shows that ~80% of active funds underperform their index over 10+ year horizons after costs. Fund selection adds noise + behavioural risk. Active funds may make sense for: (a) niche / illiquid markets where indexes are weak (emerging markets, small caps in some scenarios), (b) specific factor tilts (value, quality), (c) personal conviction about manager skill. Most investors are better served by global index investing + occasional active sleeve if desired.
How important is rebalancing?
Important but oversold. Annual rebalancing of a multi-asset portfolio adds ~0.1-0.3% per year over long horizons via "selling high, buying low" mechanics. Robo-advisors do this automatically. Single-fund Vanguard LifeStrategy + Target Retirement do this automatically inside the fund. DIY multi-fund investors should rebalance annually to maintain target allocation. The behavioral benefit (preventing drift to risky concentration) often outweighs the mathematical benefit. Don't overdo it - quarterly rebalancing adds friction without meaningful benefit.