A Bitcoin trade can move in the right direction and still deliver a smaller return than expected. The difference may come down to the cost of keeping the position open.
This is particularly relevant to perpetual futures, which allow traders to speculate on cryptocurrency prices without owning the underlying asset or committing to a fixed settlement date.
Unlike a simple spot purchase, however, these contracts can involve recurring payments between traders known as funding.
The perpetual futures funding rate determines the size and direction of those payments. Depending on the rate, the position and how long it remains open, funding can add to a trader’s costs or generate income.
The key is to look beyond the headline percentage and consider how it applies to the value of the position.
Why perpetual futures need a funding rate
Traditional futures contracts have expiry dates. As settlement approaches, the relationship between the futures price and the underlying asset’s spot price is influenced by the contract’s terms and the process of settlement.
Perpetual futures work differently. They have no predetermined expiry, allowing traders to maintain their exposure for as long as they meet the platform’s margin requirements and other conditions.
That flexibility creates a challenge. Without a scheduled expiry, the contract price could remain above or below the spot market price for extended periods. A mechanism is therefore needed to encourage the two prices to stay reasonably aligned.
Funding serves that purpose by transferring payments between traders holding opposite positions. The rate is generally influenced by the premium or discount between the perpetual contract and its reference price. Some contracts also incorporate an interest component, depending on their design. The precise calculation varies by platform.
Funding is an incentive rather than a guarantee. It can encourage traders to take the less crowded side of a market, but it does not force the perpetual contract to trade at exactly the same price as the underlying asset.
Who pays the funding rate, and when?
The direction of the payment depends on whether the funding rate is positive or negative.
When the funding rate is positive, traders with long positions generally pay those holding short positions. This often occurs when perpetual futures trade at a premium to their reference price, reflecting relatively strong demand for long exposure.
When the funding rate is negative, the arrangement reverses. Short-position holders generally pay those holding longs, often when the contract trades at a discount.
A long position benefits from a rise in the asset’s price, while a short position benefits from a fall. Funding payments are separate from the profit or loss generated by that price movement.
For example, suppose a trader holds a long Bitcoin perpetual contract while the funding rate is positive. Even if Bitcoin rises and the position gains value, the trader may have to pay funding at each settlement.
A short-position holder could receive those payments, although any benefit would still need to be weighed against the risk of an adverse price move.
The timing matters as well. Some platforms settle funding every eight hours, while others use hourly or different intervals. Traders should check the rules for the specific contract rather than assume a universal schedule.
On many platforms, a position must remain open at the funding timestamp for the payment to apply. Opening or closing a position at another point in the interval does not necessarily trigger the same charge.
Funding is also distinct from a trading commission. It is generally a transfer between market participants, rather than a fee charged by the exchange for executing an order. Trading commissions and other transaction costs can still apply separately.
How much can funding cost over time?
The basic calculation is relatively straightforward: Funding payment ≈ position value × funding rate
The exact formula depends on the contract, including the reference price used and its settlement rules. For a typical linear contract, however, the relationship provides a useful way to estimate the amount involved.
Consider a hypothetical trader with a perpetual futures position worth $10,000 and a funding rate of 0.01% at an eight-hour settlement.
The payment would be: $10,000 × 0.01% = $1
If the trader holds the position through three funding settlements in a day, and the same rate and position value apply each time, the total payment would be $3.
Over 30 days, the cumulative amount would reach $90.
| Holding period | Hypothetical funding cost |
|---|---|
| One eight-hour interval | $1 |
| One day, with three settlements | $3 |
| 30 days, with 90 settlements | $90 |
These figures are illustrative, not a forecast of actual funding costs. They assume the position remains worth $10,000 and the rate stays at 0.01% throughout the period. In reality, both can change, and negative funding can reverse the direction of the payments.
It is also essential to check how a platform quotes its rate. A figure displayed for an eight-hour interval cannot automatically be treated as an hourly rate, and an hourly quote should not be multiplied by three as though it covered a full eight-hour period.
The practical lesson is that the cost depends on more than the percentage shown on screen. Traders need to know the rate’s time basis, the position’s value at settlement and the number of payments likely to apply while they hold the contract.
A position held for several days may accumulate funding costs even if the market barely moves. Conversely, favourable funding can offset some costs or provide a payment, depending on the position and the rates applied.
Why leverage makes funding more significant
Leverage allows a trader to control a position worth more than the capital deposited as margin. It changes the amount of exposure a trader takes on, which also changes the potential impact of costs and price movements.
Suppose someone commits $1,000 as margin to control a $10,000 perpetual futures position. If the funding payment is $1, the amount is equivalent to 0.1% of the initial margin, even though it represents only 0.01% of the position’s value.
This explains why looking at the funding rate alone can be misleading. A small percentage of a large position may represent a meaningful share of the capital supporting it.
Funding is generally calculated against the position’s value rather than simply against the margin deposited. Increasing leverage does not automatically increase the payment if the notional position remains unchanged.
However, leverage makes it possible to take on a larger position with the same initial capital, potentially increasing the absolute funding payment.
Price movements can have an even greater effect. A 1% adverse move against a $10,000 position represents an approximate $100 loss, before funding and other costs. Against an initial margin of $1,000, that is equivalent to 10% of the original deposit.
If the available margin falls below the level required by the platform, the position may be liquidated. The precise threshold depends on factors including maintenance margin, the price used to assess the position and the platform’s risk rules.
Funding payments can contribute to the erosion of available equity, but they are only one part of the picture. The underlying price movement and the position’s margin requirements remain central to liquidation risk.
A high funding rate is not a forecast of the next price move
Funding rates can reveal something about how traders are positioned, but they cannot tell the whole story.
Persistently positive funding may indicate that demand for long exposure is strong relative to demand for short exposure. In some circumstances, this can make maintaining a long position more expensive. Negative funding can indicate the opposite imbalance.
Neither condition guarantees a reversal. A positive rate can remain in place while prices continue to rise, just as negative funding can persist while prices continue to fall.
Funding is first and foremost a mechanism for encouraging price alignment between the perpetual contract and its reference market. Treating it as a reliable prediction tool confuses its function with a separate question about future market direction.
For a trader assessing an existing position, a changing funding rate is best understood as one variable among several. It can influence the economics of staying in a trade, but it cannot replace an assessment of the underlying asset, market conditions or the risks of the position itself.
What should you check before keeping a position open?
The cost of holding perpetual futures is not fixed at the moment a trade begins. The funding rate can change, settlement payments can accumulate, and the value of the position can move with the market.
Before leaving a position open, check the current and expected funding rate, whether it is quoted per hour or per longer interval, and when the next settlement occurs. Estimate the payment using the position’s value rather than the margin alone, then consider how that amount could accumulate over the intended holding period.
It is also worth separating funding from trading commissions, spreads and slippage. Each affects the overall result differently, and the actual cost of a trade may be higher than the funding figure suggests.
The central question is not simply whether a perpetual futures position is moving in the right direction, but whether the expected outcome justifies the cost of maintaining it.
With no fixed expiry to force a decision, traders must account for the possibility that the economics of remaining in a position will change while they wait for the market to move.
That is the trade-off behind perpetual futures: flexibility over when to exit comes with a continuing need to assess what staying in the market costs.