Best Brokers for Trading Indices in 2026: Costs, Instruments and Access

Best brokers for trading indices: UK comparison

These selections reflect the clarity of published products and charges, not a claim that a single firm delivers the lowest spread across all sessions. Cash and forward quotes are over-the-counter derivatives; only the Interactive Brokers futures route in this table is exchange-traded.

The figures are broker-published schedules rather than like-for-like realised dealing costs. Check IG's UK indices CFD product details, CMC's CFD charges, Pepperstone's UK index fee table and Interactive Brokers' futures commissions for the relevant instrument and account. A quoted point spread is not a monetary cost without its contract multiplier.

Cash indices, CFDs, CFD forwards and futures: the crucial differences

A stock index itself is a calculation, not a share that can be purchased. Brokers offer different ways to gain exposure to its movement. A broker's symbol such as US500 may reference the S&P 500 without being the underlying index, an ETF or an exchange-listed futures contract.

For example, IG's index schedule labels both cash CFDs and “futures” CFDs. That latter label describes the CFD's expiry pricing, not an automatically exchange-cleared futures holding. Likewise, Pepperstone's US500-F is a CFD forward derived from futures, with its own broker contract and rollover policy. CME's MES specification, by contrast, describes a listed Micro E-mini S&P 500 futures contract with a $5-per-point multiplier and a 0.25-point minimum price increment.

1. IG: clear index CFD schedules and extended-hours choices

Best fit: a UK trader who wants to inspect session-dependent spreads and contract multipliers before choosing a cash or futures-priced index CFD. IG publishes distinct UK product-detail tables instead of relying only on a market-wide “from” spread.

For the FTSE 100 cash CFD, IG's September 2026 UK schedule lists a 1-point dealing spread from 08:00 to 16:30 and 3 points from 01:00 to 07:00. It lists a £2-per-point mini CFD contract for the FTSE 100, so a 1-point bid-ask spread represents £2 on that one-mini-contract notional, before financing, slippage or conversion. The same schedule gives a US 500 cash spread of 0.4 points from 14:30 to 21:00, but the US 500 mini CFD contract uses a different $50-per-point multiplier. Comparing 1 point on FTSE with 0.4 on US 500 without a trade size is misleading.

IG's cash indices are undated CFDs with daily interest and dividend adjustments. Its UK overnight-funding explanation sets out an index CFD formula using the notional value, relevant benchmark and a published 3% annual administration rate. Rates change, and holding a position through the Friday cutoff can bring a three-day weekend adjustment. A separate fee guide explains why futures-priced index CFDs tend to show wider spreads instead of a separate daily financing transaction.

The main limitation is cost and size variation across products. A spread marked “24 hours” does not mean a constant spread or uninterrupted tradability, and weekend index instruments are separate markets with different prices. For entity scope, IG's UK legal terms identify IG Markets Ltd for CFDs and IG Index Ltd for spread betting. Do not transfer a CFD example automatically to a spread-betting account.

2. CMC Markets: broad cash and forward index choice

Best fit: a UK CFD trader wanting to compare more regional index instruments and cash-versus-forward holding structures on a single platform. CMC's UK indices offering describes more than 80 cash and forward index instruments covering North America, Europe and Asia-Pacific. This is an instrument-count claim by the provider, not confirmation that all variants are simultaneously available to every client.

CMC's UK charges FAQ treats the dealing spread as the difference between bid and ask and points users to the live instrument overview for funding. Its index holding-cost schedule calculates overnight cash-index CFD financing from the relevant reference interest rate, plus 0.0082% for long positions or minus 0.0082% for shorts, with rates and outcomes depending on direction. Positions may also receive dividend adjustments. Forward index CFDs have no separate daily holding-cost entry, but that is not evidence that financing or the roll is free.

CMC's published promotional minimum spreads and streaming quotes can change, so the fair method is to record the UK 100 and US 500 bid and ask at the intended dealing time, alongside the contract size. A temporary advertised minimum is not a reliable all-year average. The platform's underlying index name, margin requirement, session timetable and maturity must be checked separately for cash and forwards. This is not a recommendation to treat CFD leverage as equivalent to listed futures margin.

The UK product site identifies CMC Markets UK plc as the FCA-regulated provider in its account information. The most practical comparison is with IG cash index CFDs over the same holding window, rather than a generic comparison of total product counts or unverified execution speeds.

3. Pepperstone: index CFDs with MetaTrader and TradingView access

Best fit: a UK trader who already uses MT4, MT5, cTrader or TradingView and wants to trade cash index CFDs or selected futures-referenced CFD forwards without a separate index-CFD dealing commission. Pepperstone's UK index offering describes more than 20 cash stock indices, including US 500, US Tech/Nasdaq-linked, UK 100, Germany 40 and Japan 225 markets, plus certain forwards.

The UK fee table lists a US500 Razor minimum of 0.4 index points, while US500-F is listed with a 1-point minimum spread. Those are minimum quoted spreads for distinct CFD products, not a guarantee that a cash CFD and a forward CFD can be bought and sold at those prices at any chosen time. Its index CFDs carry no separate commission. The same schedule shows a 2.5% annualised charge component in its swap formula alongside the relevant rate benchmark for cash index CFDs. A 2.5% annualised component is not the total daily charge; it must be combined with the benchmark and actual notional.

Pepperstone states that CFD forwards incorporate financing into the spread and automatically roll according to its terms. Their futures reference does not put the trader on the CME exchange. Its published market-hours table shows near-24-hour weekday sessions for US500 and other major symbols, plus scheduled interruptions. The table runs in broker server time, GMT+2 in winter and GMT+3 during US daylight saving time, so it must be converted before comparing a session with IG's London-time spreads.

The UK legal documents identify Pepperstone Limited, FCA firm reference 684312. Entity and platform matter: spread-betting account terms, international group offers, index spreads, holiday hours and CFD swap charges are not necessarily interchangeable.

4. Interactive Brokers: exchange-traded futures rather than another index CFD quote

Best fit: a trader who specifically wants listed equity-index futures, understands expiration and exchange margin, and can meet permissions and collateral requirements. Interactive Brokers offers access to CME equity-index futures including S&P 500, Nasdaq-100, Russell 2000 and Dow Jones products, with micro versions for selected contracts.

Take CME's Micro E-mini S&P 500 future (MES). The exchange specifies a $5-per-index-point multiplier and 0.25-point tick, so one tick is worth $1.25 per contract. That is a contract characteristic, not a prediction that the next bid-ask spread will be one tick. IBKR's US futures tariff lists $0.25 per MES contract per side for the initial monthly volume tier, with exchange and regulatory fees on top. A round trip at that brokerage rate is $0.50 in broker commission before exchange fees, the actual exchange spread, slippage and conversion. Do not read “$0.25 commission” as the all-in round-trip cost.

Unlike an undated cash CFD, MES has an exchange-defined contract month and expiry. Its futures curve reflects interest and dividends, while margin and market data are governed by brokerage and exchange rules. Trading permissions and data access need to be enabled; paid market-data subscriptions may apply. CME describes equity-index futures sessions as approximately 23 hours daily from Sunday to Friday, with a scheduled maintenance break, rather than uninterrupted 24/7 access.

UK legal scope needs care. The Interactive Brokers (U.K.) Limited services guide says the firm is FCA-regulated but explains that certain products or custody and execution functions may be handled by its US affiliate. Read the actual account agreements and the carrying entity before assuming which protection framework applies. The broker also offers separate index CFDs in some accounts; those should not be confused with its listed futures route.

How to compare total index trading costs fairly

A low displayed index spread is only one part of the trade. To compare brokers, use the same reference market, economic exposure, entry/exit window and holding period. A cash US 500 CFD cannot be ranked against a one-contract MES future merely by comparing “0.4 points” and “$0.25 commission”. Their multipliers, financing and expiration differ.

1. Turn points into money

Indicative spread cost = quoted spread in index points × monetary value per point × number of contracts. As an example using IG's published UK cash CFD terms, one FTSE 100 mini contract at £2 per point and a 1-point spread gives a £2 initial spread cost. At the same size, a 3-point out-of-hours spread gives £6. These are arithmetic examples from a stated schedule, not orders submitted or fees observed. A wider exit spread, slippage and changes in the quote would alter the actual result.

For a future, convert the exchange spread into ticks: the MES tick value is $1.25. Then add the broker's entry and exit commission, exchange and regulatory charges, possible market-data subscription and any currency conversion. Margin is not itself a dealing fee, but maintaining sufficient margin determines the ability to hold the position.

2. Price the holding period, not just the entry

• Same-day cash CFD: spread and execution dominate if the position closes before the relevant financing cutoff. Conversion or other account charges may still apply.
• Multi-day cash CFD: add overnight funding for every holding day, any weekend multipliers and cash dividend adjustments; the rate for a short position may differ from the long rate.
• Index forward CFD: there may be no separately posted daily financing debit, but forward pricing, spread and rollover still carry a cost.
• Exchange-traded future: add full round-trip commission and exchange fees, live bid-ask spread and potential roll costs. The future's price includes carry rather than using a cash-CFD swap formula.

3. Include conversion, payment and other charges

Index P&L may be denominated in GBP, USD, EUR or another currency even when the account is funded in pounds. Check the entity's FX conversion rule, deposit and withdrawal method fees and potential third-party bank charges. For futures, review data subscription costs, exchange fees, clearing charges and any relevant overnight-position fee. Where a broker does not publish an instrument-level average spread or a complete account-specific fee schedule, the outcome is not verified, not zero.

Trading hours and regions: when the same index has different prices

The underlying UK stock market's main session, a broker's CFD dealing session and a US futures exchange session are different clocks. They often overlap, but not perfectly. Broader access can help with positioning around overnight news; it does not promise a tight or continuous quote.

The cited schedules are maintained by IG, Pepperstone and CME. CMC market-hours details must be checked on the specific live dealing ticket rather than inferred from its general index product page. Public holidays, contract rolls, broker maintenance and daylight saving changes can shift all of these windows.

UK regulation, account type and region restrictions

The UK legal provider matters more than a global group's brand name. This comparison uses the documented UK-facing routes: IG Markets Ltd for CFDs (IG Index Ltd for separate spread bets), CMC Markets UK plc, Pepperstone Limited and Interactive Brokers (U.K.) Limited's applicable account services. Each is subject to its own agreements; an offshore entity's leverage and instrument range should never be assumed available to a UK resident. Verify the named firm in the FCA Register against the live application and account agreement.

The FCA's retail CFD rules include leverage restrictions and risk safeguards. For major stock-index CFDs a 5% initial margin is common in the cited UK schedules, while some non-major indices require more. This is not a rule that every index and all types of futures have the same margin or the same negative-balance protections. Professional classification can change protections. Futures eligibility, market-data access, exchange permissions and margin must be assessed on their own terms.

UK spread betting should not be used as a universal tax comparison. Tax treatment depends on individual circumstances and applicable law, and a CFD, spread bet, ETF and listed future are not interchangeable merely because each references a stock index.

How to choose an indices broker for your strategy

1. Specify the index and region. Write down the actual instrument, such as FTSE 100 cash CFD, US500 forward CFD or CME MES, rather than simply “indices”. Regional and overnight availability varies.
2. Choose the product category. Decide whether a broker-counterparty cash CFD, a futures-priced CFD, a spread bet or an exchange-traded future is suitable. Do not treat a broker's “futures” CFD as listed futures access.
3. Normalise position size. Compare monetary value per index point, not points of advertised spread alone. Check the lot step, minimum stake and account currency.
4. Measure the intended trading window. Record indicative live bid and ask at the same time and date, including around opens, holidays and important releases. This article supplies no matched execution dataset.
5. Calculate the complete round trip. Include opening and closing spread, commission, overnight funding or futures roll, exchange fees, conversion and realistic slippage assumptions.
6. Confirm legal eligibility and protections. Verify the contracting and carrying entities, product permissions, retail margin regime, stop mechanics and whether professional terms change protection.
7. Inspect real platform details before funding. Check the order ticket, symbol schedule, margin preview, expiry rules and current tariff. Demo prices help with familiarisation but are not proof of live fills.

Reviewer verdict: IG is the clearest published UK schedule in this selection for cash-versus-futures-priced CFD costs; CMC Markets merits comparison when breadth of regional cash and forward indices matters; Pepperstone is practical when platform compatibility and commission-free index CFDs matter; and Interactive Brokers belongs on the shortlist specifically when the requirement is a genuine exchange-traded index future. No provider can be called cheapest across all indices, position sizes and holding periods from promotional spreads alone. For broader CFD broker considerations, see FXRanking's CFD broker comparison; it serves a different, cross-market purpose.