UK retail options traders mostly use US S&P 500 options because they're liquid and well-known. But UK index options exist — FTSE 100 options trade on ICE Futures Europe (the successor to LIFFE), and FTSE 250 options also exist but with much lower volume. Key practical differences: FTSE 100 options have £10 per index point (vs $100 for S&P 500), 5-decimal-point pricing (vs 2 for US), and expire monthly. UK tax position is materially simpler — no foreign withholding tax issues, gains in CGT bands as for any UK security.
FTSE 100 options — contract specifications
- Underlying: FTSE 100 index (UKX).
- Contract size: £10 per index point.
- Tick size: 0.5 index points = £5.
- Expiry: Third Friday of each calendar month (matched to FTSE 100 futures).
- Settlement: Cash-settled at the Exchange Delivery Settlement Price (EDSP) — no physical delivery.
- Exchange: ICE Futures Europe (formerly LIFFE).
- Hours: 08:00 to 16:30 UK time, electronic.
So a FTSE 100 call option struck at 7,500 with a 50p premium = £500 cost (50p × £10 per index point × 100 = £500 — actually it's premium × £10 = £500 per contract for a 50.0 tick value). Always check the broker's contract specification before trading.
FTSE 250 options
FTSE 250 (the mid-cap UK index) has options available but trading volume is materially lower. Most retail traders find liquidity insufficient for active strategies. The specifications mirror FTSE 100: £10 per index point, monthly expiry, cash-settled.
If you want broad UK mid-cap exposure via options, FTSE 250 ETF options (e.g., MIDD or VMID on Vanguard) often have better liquidity than direct FTSE 250 index options for retail-size positions.
How FTSE 100 options differ from US S&P 500 options
| FTSE 100 options | S&P 500 (SPX) options | |
|---|---|---|
| Contract size | £10 per index point | $100 per index point |
| Tick size | 0.5 = £5 | 0.05 = $5 |
| Expiry | Monthly (3rd Friday) | Monthly + weekly + daily |
| Liquidity | Moderate | Extremely high |
| Hours | UK trading hours (08:00-16:30) | US hours + extended pre/post |
| Settlement | Cash, EDSP | Cash, AM expiration |
| UK tax | UK CGT bands, no W-8BEN needed | UK CGT bands + potential US withholding on assignments |
Why most UK retail trade S&P 500 instead
- Liquidity: SPX is the deepest options market in the world. Bid-ask spreads are tight, even on far-out-of-the-money strikes.
- Variety of expiries: SPX has weekly, monthly, daily options. FTSE 100 only has monthly.
- Hour coverage: US options trade 14.5 hours a day with extended hours. FTSE 100 trades 8.5 hours.
- Educational material: 95% of options education online is US-focused.
The cost of trading SPX from the UK: an extra layer of W-8BEN admin, slightly higher per-contract fees, and trading-hour overlap with your day job (US opens 14:30 UK time).
When FTSE 100 options make sense
- UK-tax-optimised approach. Gains are straight UK CGT — no foreign withholding complications.
- Hedging a UK-equity-heavy portfolio. Buying FTSE 100 puts is a cleaner hedge than buying S&P 500 puts for a UK-heavy ISA.
- UK-trading-hours preference. If you don't want to trade evenings or extended hours.
- SIPP-wrapped strategy. Some UK SIPP brokers permit FTSE 100 options but not US options.
FTSE 100 options worked example
Buying a FTSE 100 put for portfolio hedge
Your ISA holds £50,000 of UK equity ETFs (VUKE — Vanguard FTSE 100). FTSE 100 is at 8,000. You want hedge protection if FTSE falls below 7,500 in the next 60 days.
| Buy 1 FTSE 100 7,500 put, 60-day expiry, premium 100 points | −£1,000 |
| If FTSE falls to 7,000: put has intrinsic value 500 points | £5,000 value |
| Premium paid £1,000, value at 7,000: £5,000 → profit £4,000 | +£4,000 |
| Your ETF loss (£50k → ~£43.75k at FTSE 7,000) | −£6,250 |
| Net household position | −£2,250 (vs −£6,250 unhedged) |
Insurance cost in a no-fall scenario: £1,000 (if FTSE stays above 7,500 to expiry, the put expires worthless). Premium cost vs portfolio: 2% of holdings for 60 days of below-7,500 protection.
Tax position
For UK residents trading FTSE 100 options in a GIA:
- Premiums received (when selling options) are CGT gains on opening — wait, that's wrong. The actual treatment: premiums earned from selling options that expire worthless are CGT gains when the position closes (at expiry). If options are exercised against you, premiums adjust the cost basis of the underlying. If you buy an option that expires worthless, you have a CGT loss for the premium.
- Bed-and-breakfasting (30-day rule) applies if you close and re-open similar positions.
- £3,000 annual CGT allowance applies (2026/27).
- Above allowance: 18% basic rate / 24% higher rate.
- Inside a SIPP (if permitted): tax-free.
See the tax worked examples for the full per-strategy treatment.
Sources and methodology
Contract specifications follow ICE Futures Europe published exchange rules as of 2026/27. Tax treatment follows HMRC's published guidance on options taxation. For complex options positions, see the tax adviser editorial recommendation. The methodology page documents sources.
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How UK Tax Drag holds itself to account
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