Best Platform for Long-Term Investing UK 2026/27

Our top picks for long-term UK investors

What long-term investing needs from a platform

Long-term investing is a 20-40 year commitment. Platform choice needs to survive that horizon. Three things matter:

1. Fee compounding. Small percentage differences become large over decades.
2. Wrapper continuity. The platform needs to support ISA, SIPP, and drawdown so you don't have to switch.
3. Platform stability. Track record matters. Newer platforms are cheaper but less proven over 20+ year horizons.

Hargreaves Lansdown — accumulation-to-withdrawal

HL supports the full UK retail wrapper range. Vanguard LifeStrategy for accumulation, drawdown mechanics for retirement, JISA for children, LISA for first home. One login covers the family's long-term wrappers.

Track record: UK's largest platform. Over 1.9m clients. Robust infrastructure.

Fees: 0.45% on funds tiered down, capped £45/year on shares/ETFs.

Best for: UK investors thinking 20+ years out who want research, phone support, and one platform for life.

Open account with Hargreaves Lansdown →

InvestEngine — cost-focused for long horizons

0% platform fee on DIY ETF portfolios. Over 30 years at 6% growth, a 0.3% fee gap compounds to roughly £45,000 lost on a £100,000 portfolio. For pure DIY ETF investors, InvestEngine's cost advantage is genuinely material over long horizons.

Long-term caveat: InvestEngine launched 2019. Less track record than HL. Its drawdown mechanics are competent but newer.

Open account with InvestEngine →

Interactive Investor — flat fee scaling

Flat monthly fee (£4.99–£12.99 by plan). Below £75,000 the flat fee is expensive in percentage terms. Above £150,000 it usually wins. For pots expected to grow past £150,000 over the long term, this fee structure is attractive.

Long-term cost comparison — £20,000 initial, £200/month for 30 years at 6%

Illustrative; ignores compounding of contributions vs OCF-adjusted returns. Real markets don't return exactly 6% every year.

Wrapper coverage over 40 years

A UK life-long investor may use these wrappers across a career:

• 20s: S&S ISA. LISA (under 40).
• 30s: Add SIPP. Add JISA for children.
• 40s: Consolidate old workplace pensions into SIPP.
• 50s: Coordinate ISA + SIPP for retirement planning.
• 55+: Enter SIPP drawdown. Continue ISA contributions.

HL supports every one of these wrappers under one login. InvestEngine supports ISA, SIPP, GIA but not LISA or JISA. Choose accordingly.

Decision framework — long-term platform choice

1. Want one platform for life? → HL supports everything you'll need.
2. Cost-focused DIY, portfolio will be ETF-only? → InvestEngine over the long haul.
3. Under 40 buying first UK home? → HL (LISA + adult ISA).
4. Expect pot to grow past £150,000? → Consider ii's flat fee.
5. Very undecided? → Start with HL — never regret being on the biggest UK platform.

Common long-term mistakes

• Optimising for today's fees without considering wrapper needs 10 years from now.
• Ignoring platform track record — newer platforms are cheaper but less proven.
• Not diversifying across two platforms once portfolio nears FSCS £85,000/platform.
• Panic-switching platforms during drawdowns.
• Not naming beneficiaries.

Final recommendation

For 20-40 year investing horizons: Hargreaves Lansdown for wrapper continuity and service, or InvestEngine for pure DIY ETF cost minimisation. Many long-term UK investors use both — HL for LISA/JISA/complex wrappers, InvestEngine for main ISA accumulation. Both approved PennyWise partners.

Open account with Hargreaves Lansdown →

Open account with InvestEngine →

Frequently asked questions

Should I switch platforms every few years to chase low fees?

Usually not — transfer friction and out-of-market time can erase savings. Better to choose one that fits your long-term needs.

Are newer platforms safe for long-term investing?

FSCS cover and FCA regulation apply the same way. What newer platforms lack is track record — HL has 40+ years of operation history.

How does a 0.3% fee gap add up over 30 years?

On £100,000 growing at 6%, roughly £45,000 in terminal wealth difference. Not trivial.

Should I split my portfolio across platforms?

For pots over about £150,000, splitting doubles FSCS investment cover (£85k per person per platform). Also reduces platform-specific risk.

Which platform survives 30 years best?

Impossible to guarantee, but HL's scale, regulatory relationships and track record make it the most likely UK platform to still be operating in 2056.