How to Invest £100,000 UK 2026/27 — Wrapper Strategy & Platform Choice

£100,000 changes the calculus

At six figures, three things become important that don't matter at £1,000: platform fee structure (percentage vs flat), tax planning across multiple wrappers, and FSCS investment cover limits. This guide covers what changes.

The strategic questions at £100,000

1. Where does the £100,000 come from — lump sum from house sale/inheritance, or accumulated over years?
2. What's your time horizon for it?
3. What's your tax situation now and expected in retirement?
4. Do you already have a workplace pension or other pension pots?
5. Are you within 6 months of a lump-sum life event (Temporary High Balance rules)?

Wrapper allocation for £100,000

You cannot put £100,000 into an ISA in one year — the annual allowance is £20,000. Realistic approaches:

Approach A — Rapid ISA build over 5 years

• Year 1: £20,000 into Stocks & Shares ISA, £80,000 in GIA.
• Years 2-5: Bed-and-ISA £20,000 per year, transferring from GIA to ISA.
• After 5 years: all £100,000 in ISA, tax-sheltered.

Approach B — ISA + SIPP combo

• £20,000 into ISA.
• Up to £60,000 into SIPP (subject to earnings limit).
• Remainder in GIA.
• Higher-rate taxpayers get significant relief on SIPP contributions.

Approach C — Distributed via spouse

• Combined ISA allowance for a couple: £40,000/year.
• Combined CGT allowance: £6,000/year.
• Move investments to whichever spouse has better tax position.

Platform choice at £100,000

Percentage fees on £100,000 add up. Flat-fee platforms often win:

InvestEngine still wins for pure ETF portfolios. HL wins if you use fund or share picking and value research.

FSCS investment cover

FSCS covers £85,000 per person per platform for investment claims. Above £85,000 on one platform, you have counterparty exposure to that platform if it fails. Not a huge risk on well-regulated UK platforms, but worth considering:

• Split £100,000 across two platforms if minimising this risk matters to you.
• For a couple, joint holdings + separate holdings can push effective cover much higher.
• Nominee structure means most investment losses in a failure would still be recoverable — FSCS is the backstop.

Investment approach at £100,000

Fund choice still doesn't need to be complex. Options:

• All-in-one: 100% VWRP or LifeStrategy 80/100%.
• Core-satellite: 80% VWRP + 20% specific tilts (small-cap, dividend, thematic).
• Balanced multi-asset: 70% equity ETFs + 20% bond ETFs + 10% alternatives.

For most UK investors, all-in-one is still the right choice at £100,000. Complexity doesn't add returns.

Lump-sum vs drip-feed at £100,000

The behavioural pull is stronger with £100,000. Realistic hybrid:

• Deploy 40-50% immediately (into the current tax year's ISA and SIPP).
• Spread the remainder across 12 monthly instalments.
• Feel the market volatility on 40-50% rather than 100%.

See Pound cost averaging.

Common £100,000 mistakes

• Analysis paralysis — waiting 6 months to pick the "perfect" portfolio.
• Owning 12 different funds thinking that's diversification.
• Choosing HL because "it's the big one" without checking if percentage fees suit £100,000.
• Leaving £100,000 in cash on the platform earning 0.5% while deciding.
• Not using the SIPP for higher-rate tax relief.
• Ignoring FSCS investment cover on very large holdings at one platform.

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Frequently asked questions

Can I put £100,000 into an ISA in one year?

No. ISA annual allowance is £20,000. To shelter £100,000, use ISA + SIPP + GIA together, then bed-and-ISA £20,000 per year across multiple tax years.

Should I use an adviser at £100,000?

Depends on your knowledge and confidence. For a straightforward DIY case (ISA + SIPP + global ETF), self-directed works fine. For complex situations (defined benefit transfers, business exits, IHT planning), professional advice is worth the fee.

What's the risk of one platform failing?

Low but not zero. UK-authorised platforms are well-regulated and use nominee structures. FSCS covers up to £85,000 per person per platform. Splitting £100,000 across two platforms eliminates all counterparty risk.

Should I invest £100,000 or use it to buy a property?

Different questions with different answers. Property gives housing and leverage; investing gives liquidity and diversification. Many households do both across time.

Which SIPP is best for £100,000?

At £100,000, Interactive Investor's flat fee (~£156/year) beats percentage-fee platforms like HL (£450). InvestEngine still 0% on DIY ETFs. See our Best SIPP UK guide.