CFD Overnight Funding: Why Leverage Makes a Small Daily Rate Expensive

Learning objective

Learn how CFD overnight funding is calculated, why the charge is usually linked to the full notional exposure rather than the margin deposited, and how to test whether holding a leveraged trade still has positive expectancy after financing.

A contract for difference gives price exposure without ownership of the underlying asset. The margin posted can be a small fraction of that exposure, but financing can apply to the full notional value. That difference makes a daily rate that looks small much larger when measured against the cash committed to the trade.

The UK Financial Conduct Authority said in an October 2026 review that CFD funding charges vary considerably and that disclosure of their level and calculation still needs improvement. It also highlighted charges on matched long and short positions. Traders therefore need the provider's exact formula rather than an assumption based on the headline margin rate.

Step 1: separate margin from notional exposure

Suppose a trader opens a £20,000 CFD position and the broker requires £2,000 of margin. The exposure is £20,000 even though only £2,000 supports the position initially.

Notional exposure: the market value whose price movement drives profit and loss.
Margin: collateral required to open and maintain the leveraged position.
Funding rate: the provider's rate for carrying the position through its daily cut-off.

Price risk and most percentage-based funding calculations use the notional exposure. Measuring the charge only against margin can hide how quickly it consumes account equity.

Step 2: reconstruct the provider's formula

A simplified daily calculation is:

Daily funding = notional exposure × annual funding rate ÷ day-count basis

The actual method may use 360 or 365 days, a benchmark rate plus a provider mark-up, a separate short-position rate, an instrument-specific adjustment and a different treatment for weekends or holidays. Some positions may receive a credit, but a short trade is not automatically paid funding.

Before holding overnight, identify:

the benchmark and mark-up;
long and short rates;
whether the displayed rate is annual or daily;
whether the calculation uses opening, closing or another reference price;
the daily cut-off time and time zone;
weekend and holiday multipliers;
currency-conversion charges;
dividend or other cash adjustments.

Worked example

Use a hypothetical £20,000 long CFD with £2,000 initial margin. Assume an annual funding rate of 8%, a 365-day basis and no change in price.

Daily funding is:

£20,000 × 8% ÷ 365 = £4.38

Over 30 chargeable nights, the simplified total is:

£4.38 × 30 = approximately £131.51

That is 0.66% of the £20,000 notional, but 6.58% of the £2,000 margin. The market can remain flat while the account still loses value through financing. Spread, commission, slippage, currency conversion and any changing rate would add to or alter the result.

Now suppose the trader holds a £20,000 long and a £20,000 short in the same CFD. Directional exposure appears matched, but the provider charges 8% on each gross position. The simplified combined cost becomes approximately £8.77 per night, before other charges. The FCA has specifically raised concerns about full funding charges on matched positions and about whether consumers receive a clear comparison with simply closing them.

The example illustrates mechanics, not a standard market rate. Provider terms and rates can change.

Step 3: calculate the break-even move

Financing raises the price move needed to break even. A simple holding-cost hurdle is:

Total hurdle = opening spread and commission + expected funding + expected exit cost

If the hypothetical position incurs £131.51 of funding over 30 nights, the underlying must move more than 0.66% in the favourable direction just to recover that funding on the £20,000 notional. The true hurdle is higher after entry and exit costs.

Compare this hurdle with the strategy's expected move over the intended holding period. A short-term signal held for weeks may become a different trade once financing dominates its expected edge.

Step 4: stress rate and holding-period uncertainty

Do not calculate only the best case. Test:

the trade lasts twice as long as planned;
the annual funding rate rises;
a weekend or holiday charge is larger than one normal day;
the underlying moves against the position and margin usage increases;
the account currency differs from the instrument currency;
both legs of a matched position are charged;
the broker changes an instrument-specific adjustment.

The risk is a combination of price loss, funding drag and reduced free margin. A position can remain within the original stop distance while recurring costs weaken the account's ability to withstand volatility.

Step 5: compare structures, not just spreads

Two providers can quote similar dealing spreads while charging different financing rates or mark-ups. Compare the all-in cost for the intended holding period. The FCA's 2025 and 2026 reviews found wide variation in effective overnight rates and called for clearer presentation, including annualised comparisons.

Also compare the chosen instrument with an unleveraged asset, exchange-traded future or other structure where appropriate. Each has different ownership, expiry, margin, tax, liquidity and regulatory features, so a lower funding line alone does not make one product suitable.

Common mistakes

Applying the funding rate to margin instead of notional exposure.
Treating a quoted daily percentage as too small to matter.
Assuming short positions always receive a credit.
Ignoring the provider's cut-off time and weekend treatment.
Holding matched long and short positions without calculating charges on both legs.
Comparing brokers by spread while ignoring financing and conversion costs.
Using the planned holding period without testing a delayed exit.
Forgetting that rates and instrument adjustments can change.

Practical checklist

Record notional exposure, margin and account equity separately.
Save the current long and short funding formula before entry.
Convert the rate into cash per night and an annualised percentage.
Calculate the cost for the planned and stressed holding periods.
Include spread, commission, slippage, conversion and cash adjustments.
Check the cut-off, weekend and holiday rules.
Calculate matched positions on gross legs unless the provider explicitly states otherwise.
Add accrued funding to the trade journal and break-even level.
Recheck rates while the position remains open.

Sources

This tutorial was prepared with AI-assisted research and writing under The Money Man editorial workflow. It is educational information, not personalised investment advice. CFDs are complex, leveraged products with a high risk of loss. Rates, formulas, protections and tax treatment vary by provider, product and jurisdiction; verify the current terms directly before trading.

CFD Overnight Funding: Why Leverage Makes a Small Daily Rate Expensive

Executive Summary